01652nas a2200301 4500008004100000022001400041245005700055210005700112260010500169300001200274490000700286520069500293653002100988653001101009653001801020653002201038100002301060700002201083700002001105700002101125700001901146700001701165700001401182700002301196700001901219700002101238856009101259 2005 eng d a0304-428900aSynthesis and analysis of ZnO and CdSe nanoparticles0 aSynthesis and analysis of ZnO and CdSe nanoparticles aC V RAMAN AVENUE, SADASHIVANAGAR, P B \#8005, BANGALORE 560 080, INDIAbINDIAN ACADEMY SCIENCEScOCT a615-6200 v653 a

Zinc oxide and cadmium selenide particles in the nanometer size regime have been synthesized using chemical routes. The particles were capped using thioglycerol in case of ZnO and 2-mercaptoethanol in case of CdSe to achieve the stability and avoid the coalescence. Zinc oxide nanoparticles were doped with europium to study their optical properties. A variety of techniques like UV-Vis absorption spectroscopy, X-ray diffraction (XRD), photoluminescence (PL), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR) and transmission electron microscopy (TEM) were used to carry out structural and spectroscopic characterizations of the nanoparticles.

10achemical capping10aDoping10aNanoparticles10aphotoluminescence1 aAshtaputre, S., S.1 aDeshpande, Aparna1 aMarathe, Sayali1 aWankhede, M., E.1 aChimanpure, J.1 aPasricha, R.1 aUrban, J.1 aHaram, Santosh, K.1 aGosavi, S., W.1 aKulkarni, S., K. uhttps://library.ncl.res.in/content/synthesis-and-analysis-zno-and-cdse-nanoparticles-001649nas a2200241 4500008004100000022001400041245005200055210005200107260007300159300001400232490000700246520088100253653001701134653001801151653001801169653002101187100002201208700002201230700002901252700001901281700002101300856008601321 2008 eng d a0167-577X00aLow temperature synthesis of ZnSe nanoparticles0 aLow temperature synthesis of ZnSe nanoparticles aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAUG a3803-38050 v623 a

Synthesis of thioglycerol capped zinc selenide nanoparticles with a relatively narrow size distribution by a simple and inexpensive low temperature (similar to 80 degrees C) wet chemical method is reported here. Main advantage of this method is the use of non-toxic precursors. The size of the nanoparticles can be varied easily by changing the concentration of the capping agent. The extracted nanoparticles remain stable under normal atmospheric conditions and can be redispersed in suitable solvents. The sharp absorption features obtained in the UV-Visible absorption spectra reveal the formation of monodispersed ZnSe nanoparticles. The nanoparticles were characterized using X-ray photoelectron spectroscopy, X-ray diffraction, UV-Visible absorption spectroscopy, photoluminescence and transmission electron microscopy. (C) 2008 Elsevier B.V. All rights reserved.

10aLuminescence10aNanomaterials10aSemiconductor10aX-ray techniques1 aDeshpande, Aparna1 aSingh, Shashi, B.1 aAbyaneh, Majid, Kazemian1 aPasricha, Renu1 aKulkarni, S., K. uhttps://library.ncl.res.in/content/low-temperature-synthesis-znse-nanoparticles-002017nas a2200265 4500008004100000022001400041245010000055210006900155260010200224300001200326490000700338520101700345653001801362653002301380653002201403653003101425100002401456700002801480700002201508700002201530700001901552700002601571700002401597856013001621 2008 eng d a0250-470700aNew route for preparation of luminescent mercaptoethanoate capped cadmium selenide quantum dots0 aNew route for preparation of luminescent mercaptoethanoate cappe aC V RAMAN AVENUE, SADASHIVANAGAR, P B \#8005, BANGALORE 560 080, INDIAbINDIAN ACAD SCIENCEScJUN a291-2960 v313 a

We report a synthesis of cadmium selenide quantum dots (Q-CdSe) by refluxing a mixture of cadmium acetate, selenium powder, sodium sulfite and 2-mercaptoethanol in N,N'-dimethyl formamide (DMF)/water solution. X-ray and electron diffractions suggest the formation of hexagonal phase of size quantized CdSe. Based on TEM analysis, the formation of nanoparticles with an average diameter of 3.5 +/- 0.5 nm is inferred. Their sols in DMF and dimethyl sulphoxide (DMSO) gave characteristic absorption peaks at 300 nm and 327 nm, which is attributed to the formation of high quality, size quantized CdSe particles. Extracted particles from the sol were readily redispersed in DMF and DMSO, which were diluted further with water without losing their optical and colloidal properties. FTIR spectroscopy suggested the formation of 2-mercaptoethanol thiolate on the particle surface, with free -OH groups available for linkage. Sols in DMSO and their solutions in water displayed an intense photoluminescence (PL).

10achalcogenides10aChemical synthesis10aphotoluminescence10asemiconductor quantum dots1 aWankhede, Manoj, E.1 aInamdar, Shaukatali, N.1 aDeshpande, Aparna1 aThete, Aniket, R.1 aPasricha, Renu1 aKulkarni, Sulabha, K.1 aHarani, Santosh, K. uhttps://library.ncl.res.in/content/new-route-preparation-luminescent-mercaptoethanoate-capped-cadmium-selenide-quantum-dots-002499nas a2200265 4500008004100000022001400041245016100055210006900216260006900285300001200354490000800366520146200374653003801836653003001874653001901904653002301923653003601946653002001982100001802002700002002020700002202040700002502062700002402087856012202111 2009 eng d a0254-058400aDoping-induced microstructural, textural and optical properties of In2Ti1-xVxO5+delta semiconductors and their role in the photocatalytic splitting of water0 aDopinginduced microstructural textural and optical properties of aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcOCT a399-4070 v1173 a

The physicochemical properties of V-doped indium titanates (In2Ti1-xVxO5-delta, 0.0 <= x <= 0.2) were investigated by using XPS, powder XRD, UV-vis, SEM and luminescence spectroscopy techniques. The Rietveld refinement of XRD data revealed that even though the V-containing samples were isostructural with In2TiO5 (orthorhombic space group Pnma), a systematic x-dependent variation was noticeable in the Ti-O bond lengths in [TiO6] octahedral units, cell parameters and in the value of delta. XPS results confirmed the coexistence of V5+ and V4+ states, leading thereby to an enhancement in oxygen non-stoichiometry in the doped samples. A loading-dependent progressive shift from 400 to 750 nm was also observed in the onset of the absorption edge, indicating a significant narrowing of the band gap. Furthermore, the samples with higher V-content were comprised of the grain clusters having larger size and an irregular shape. The UV-vis. photoluminescence and thermoluminescence studies indicate that the doping-induced lattice defects may give rise to certain closely spaced acceptor/donor energy levels in between the band gap of host matrix. The indium titanates are found to serve as stable photocatalysts for water splitting under visible light, where oxygen was the major reaction product. The role of microstructural and morphological properties in the photocatalytic activity is discussed. (C) 2009 Elsevier B.V. All rights reserved.

10aIn2Ti1-xVxO5+delta photocatalysts10aLuminescence spectroscopy10aMicrostructure10aOptical properties10aStructure-activity relationship10awater splitting1 aShah, Pallavi1 aBhange, Deu, S.1 aDeshpande, Aparna1 aKulkarni, Mukund, S.1 aGupta, Narendra, M. uhttps://library.ncl.res.in/content/doping-induced-microstructural-textural-and-optical-properties-in2ti1-xvxo5delta-002491nas a2200229 4500008004100000022001400041245018200055210006900237260009500306300001200401490000800413520149900421653003801920653002801958653003901986653002302025100002202048700001802070700002702088700002402115856012202139 2009 eng d a0021-979700aInterfacial and physico-chemical properties of polymer-supported CdS center dot ZnS nanocomposites and their role in the visible-light mediated photocatalytic splitting of water0 aInterfacial and physicochemical properties of polymersupported C a525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USAbACADEMIC PRESS INC ELSEVIER SCIENCEcMAY a263-2680 v3333 a

Nano-composite CdS center dot ZnS moieties coated over polyester strip were found to exhibit better visible-light-mediated photo-activity for splitting of water, as compared to corresponding pure CdS or ZnS containing coupons. This increase in activity depended upon the mol ratio of the two component sulphides in a particular sample. HRTEM experiments revealed the presence of 1-3 nm size CdS particles embedded over larger size ZnS clusters, the composite samples thus functioning as a highly dispersed guest-host system. In the case of CdS and ZnS dispersed individually over polyester, average crystallite size was found to be around 5 and 15 rim, respectively. A blue shift was observed in the UV-vis absorption spectrum of US oil addition of ZnS, in conformation with the quantum size effects. Powder XRD, electron diffraction and XPS Studies showed that the nanocomposites were comprised of the face-centered cubic (alpha) phases of both US and ZnS in a close contact with each other. At the same time, certain solid solution phases, i.e. Cd(1-x)Zn(x)S. were generated at the interfaces of these two semiconductors. Our Study demonstrates that the increase in the number of reaction sites due to smaller size of US particles and the micro-structural properties associated with the nanostructured US or CdS/ZnS interfaces may together play a vital role in the augmented catalytic activity of CdS center dot ZnS composite photocatalysts. (c) 2009 Elsevier Inc. All rights reserved.

10aCdS center dot ZnS nanocomposites10aPhotocatalytic activity10aRole of microstructural properties10aSplitting of water1 aDeshpande, Aparna1 aShah, Pallavi1 aGholap, Ramkrishna, S.1 aGupta, Narendra, M. uhttps://library.ncl.res.in/content/interfacial-and-physico-chemical-properties-polymer-supported-cds-center-dot-zns-002020nas a2200217 4500008004100000022001400041245016600055210006900221260010600290300001400396490000700410520109600417653002501513653002401538653001901562653002701581653002001608100002201628700002401650856012801674 2010 eng d a0360-319900aCritical role of particle size and interfacial properties in the visible light induced splitting of water over the nanocrystallites of supported cadmium sulphide0 aCritical role of particle size and interfacial properties in the aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcAPR a3287-32960 v353 a

CdS crystallites of varying size (1 to 5.0 nm) were successfully deposited on the surfaces of polyester and activated charcoal. The size and the texture of these crystallites depended on CdS loading and also on the substrate morphology. These highly dispersed photocatalysts displayed a pyramidal trend in activity for visible light induced splitting of water molecules, similar to that reported for the heterogeneous catalytic reactions over supported noble metals. Thus, the CdS particles of similar to 2.5 nm size gave rise to maximum rate of H(2) evolution as compared to the particles of either smaller or of larger size. The particles of <1.5 nm diameter were of poor crystallinity and displayed a significant Q-size effect on the absorption edge. Our study provides direct evidence for the structure sensitivity of photocatalytic dissociation of water over supported semiconductor nanocrystallites, where the particle size and the interfacial microstructural defects played a vital role. (C) 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.

10aCdS nanocrystallites10aInterfacial defects10aPhotocatalysis10aStructural sensitivity10awater splitting1 aDeshpande, Aparna1 aGupta, Narendra, M. uhttps://library.ncl.res.in/content/critical-role-particle-size-and-interfacial-properties-visible-light-induced-splitting-002853nas a2200229 4500008004100000022001400041245014600055210006900201260006900270300001200339490000800351520198800359653001902347653001502366653001902381653001902400653001902419100002202438700002102460700001802481856012402499 2011 eng d a0254-058400aRole of lattice defects and crystallite morphology in the UV and visible-light-induced photo-catalytic properties of combustion-prepared TiO20 aRole of lattice defects and crystallite morphology in the UV and aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcAPR a546-5540 v1263 a

The physico-chemical, photo-physical and micro-structural properties responsible for the strikingly different photocatalytic behavior of combustion-prepared TiO2 (c.TiO2) and Degussa P25 (d.TiO2) samples are elucidated in this study. Electron microscopy and selected area electron diffraction micrographs revealed that the two samples exhibited different morphologies. The grains of c.TiO2 were spherical and comprised of 5-6 nm size primary particle. On the other hand, d.TiO2 consisted of large (0.5-3.0 mu m) size and irregular shape aggregates having primary particles of 15-40 nm cross-sectional diameter. The ESR study revealed that the presence of certain defect states in c.TiO2 helped in stabilization of O-. and Ti3+-OH type species during room-temperature UV-irradiation. No such paramagnetic species were however formed over d.TiO2 under similar conditions. C1s and Ti 2p XPS spectra provide evidence for the presence of some lattice vacancies in c.TiO2 and also for the bulk Ti4+ -> Ti3+ conversion during its UV-irradiation. Compared to d.TiO2, c.TiO2 displayed considerably higher activity for discoloration of methyl orange but very poor activity for splitting of water, both under UV and visible light radiations. This is attributed to enhanced surface adsorption of dye molecules over c.TiO2, because of its textural features and also the presence of photo-active ion-radicals. On the other hand, the poor activity of c.TiO2 for water splitting is related to certain defect-induced inter-band charge trapping states in the close vicinity of valence and conduction bands of c.TiO2, as revealed by thermoluminescence spectroscopy. Further, the dispersion of nanosize gold particles gave rise to augmented activity of both the catalysts, particularly for water splitting. This is explained by the promotional role of Au-0 or Au-0/TiO2 interfacial sites in the adsorption and charge-adsorbate interaction processes. (C) 2011 Elsevier B.V. All rights reserved.

10aBand-structure10aInterfaces10aMicrostructure10aNanostructures10aSemiconductors1 aDeshpande, Aparna1 aMadras, Giridhar1 aGupta, N., M. uhttps://library.ncl.res.in/content/role-lattice-defects-and-crystallite-morphology-uv-and-visible-light-induced-photo-001926nas a2200265 4500008004100000022001400041245012800055210006900183260007700252300001600329490000700345520092500352653002001277653003201297653002101329653002401350653001901374100001901393700003101412700002201443700002201465700002401487700002001511856012901531 2014 eng d a0947-653900aCovalent organic framework-cadmium sulfide hybrid as a prototype photocatalyst for visible-light-driven hydrogen production0 aCovalent organic frameworkcadmium sulfide hybrid as a prototype  aBOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcNOV a15961-159650 v203 a

CdS nanoparticles were deposited on a highly stable, two-dimensional (2D) covalent organic framework (COF) matrix and the hybrid was tested for photocatalytic hydrogen production. The efficiency of CdS-COF hybrid was investigated by varying the COF content. On the introduction of just 1 wt% of COF, a dramatic tenfold increase in the overall photocatalytic activity of the hybrid was observed. Among the various hybrids synthesized, that with 10 wt% COF, named CdS-COF (90: 10), was found to exhibit a steep H2 production amounting to 3678 mmolh(-1) g(-1), which is significantly higher than that of bulk CdS particles (124 mmolh(-1)g(-1)). The presence of a p-conjugated backbone, high surface area, and occurrence of abundant 2D hetero-interface highlight the usage of COF as an effective support for stabilizing the generated photoelectrons, thereby resulting in an efficient and high photocatalytic activity.

10acharge transfer10acovalent organic frameworks10ahybrid materials10ahydrogen production10aPhotocatalysis1 aThote, Jayshri1 aAiyappa, Harshitha, Barike1 aDeshpande, Aparna1 aDiaz, David, Diaz1 aKurungot, Sreekumar1 aBanerjee, Rahul uhttps://library.ncl.res.in/content/covalent-organic-framework-cadmium-sulfide-hybrid-prototype-photocatalyst-visible-light-002168nas a2200205 4500008004100000022001400041245012100055210006900176260007100245300001600316490000800332520136900340100001701709700001601726700002001742700002201762700002901784700001801813856013101831 2014 eng d a1932-744700aOff-stoichiometric nickel cobaltite nanoparticles: thermal stability, magnetization, and neutron diffraction studies0 aOffstoichiometric nickel cobaltite nanoparticles thermal stabili a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcJUL a16246-162540 v1183 a

In the present investigation, we report a detailed examination of the effect of off-stoichiometry introduced in NiCo2O4 by adding excess cobalt. Thus, we compare and analyze the structural and magnetic properties of the Ni075Co2.25O4 and NiCo2O4 cubic systems. A low temperature combustion method was utilized to synthesize stoichiometric (NiCo2O4) and off-stoichiometric (Ni0.75Co2.25O4) nanoparticles on a large scale. The X-ray diffraction pattern for the sample annealed at high temperature (773 K) shows the presence of a much less intense NiO phase (similar to 2-5%) in Ni0.75Co2.25O4 as compared to that in the case of NiCo2O4 sample (similar to 15-20%). The Ni 2p and Co 2p XPS spectra reveal the coexistence of Ni2+, Ni3+, Co2+, and Co3+ species on the surface of both the NiCo2O4 and Ni0.75Co2.23O4 samples in differing proportions. In addition to the basic magnetic characterizations using PPMS, these were also analyzed by neutron diffraction. The off-stoichiometric Ni0.75Co2.25O4 sample shows an interesting magnetic phase conversion from frustrated dipolar system to an enhanced magnetic ordering upon annealing. Local moments on the lattice sites of NiCo2O4 and Ni0.75Co2.25O4 samples are further compared by neutron diffraction confirming stronger ordered moments and enhanced structural and thermal stability for the Ni0.75Co2.25O4 sample.

1 aVerma, Seema1 aKumar, Amit1 aPravarthana, D.1 aDeshpande, Aparna1 aOgale, Satishchandra, B.1 aYusuf, S., M. uhttps://library.ncl.res.in/content/stoichiometric-nickel-cobaltite-nanoparticles-thermal-stability-magnetization-and-neutron-002054nas a2200181 4500008004100000022001400041245013200055210006900187260011000256300001200366490000600378520127400384100002201658700002301680700002001703700002501723856012401748 2014 eng d a2050-748800aOrthorhombic/cubic Cd2SnO4 nanojunctions: enhancing solar water splitting efficiency by the suppression of charge recombination0 aOrthorhombiccubic Cd2SnO4 nanojunctions enhancing solar water sp aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcNOV a492-4990 v23 a

The low practical efficiency of binary metal oxide semiconductor-based photo-electrochemical (PEC) water splitting has prompted researchers to examine ternary and quaternary oxides, which provide more leverage for engineering the desired PEC properties via stoichiometry (valence) and phase control. One ternary system of interest in this context is cadmium tin oxide (Cd2SnO4), which supports the cubic and orthorhombic phases with optical, electronic and catalytic properties that are favourable for PEC water splitting. However, its practical PEC performance is limited by high surface recombination of the photogenerated charge carriers. In this work we circumvent this problem by engineering the constitution of Cd2SnO4 nanoparticles to a biphasic nanojunction form, comprising of a nanocomposite of cubic and orthorhombic phases. The favourable conduction band alignment between the cubic and orthorhombic phases leads to a dramatic reduction in the recombination of the photogenerated charges, leading to a 10-fold increase (from 250 mu A cm(2) to over 2 mA cm(2)) in the photocurrent vis-a-vis the single cubic or orthorhombic phase performance. We discuss the underlying mechanism for the observed dramatic enhancement in the water splitting efficiency.

1 aDeshpande, Aparna1 aKelkar, Sarika, A.1 aRayalu, Sadhana1 aOgale, Satishchandra uhttps://library.ncl.res.in/content/orthorhombiccubic-cd2sno4-nanojunctions-enhancing-solar-water-splitting-efficiency-002231nas a2200241 4500008004100000022001400041245013600055210006900191260000800260300001200268490000600280520141600286653001101702653001701713653001301730653002201743653001701765100002201782700002201804700001901826700002501845856011901870 2014 eng d a1864-563100aWater electrolysis with a conducting carbon cloth: subthreshold hydrogen generation and superthreshold carbon quantum dot formation0 aWater electrolysis with a conducting carbon cloth subthreshold h cMAR a883-8890 v73 a

A conducting carbon cloth, which has an interesting turbostratic microstructure and functional groups that are distinctly different from other ordered forms of carbon, such as graphite, graphene, and carbon nanotubes, was synthesized by a simple one-step pyrolysis of cellulose fabric. This turbostratic disorder and surface chemical functionalities had interesting consequences for water splitting and hydrogen generation when such a cloth was used as an electrode in the alkaline electrolysis process. Importantly, this work also gives a new twist to carbon-assisted electrolysis. During electrolysis, the active sites in the carbon cloth allow slow oxidation of its surface to transform the surface groups from COH to COOH and so forth at a voltage as low as 0.2V in a two-electrode system, along with platinum as the cathode, instead of 1.23V (plus overpotential), which is required for platinum, steel, or even graphite anodes. The quantity of subthreshold hydrogen evolved was 24mLcm(-2)h(-1) at 1V. Interestingly, at a superthreshold potential (>1.23V+overpotential), another remarkable phenomenon was found. At such voltages, along with the high rate and quantity of hydrogen evolution, rapid exfoliation of the tiny nanoscale (5-7nm) units of carbon quantum dots (CQDs) are found in copious amounts due to an enhanced oxidation rate. These CQDs show bright-blue fluorescence under UV light.

10aCarbon10aelectrolysis10aHydrogen10aphotoluminescence10aquantum dots1 aBiswal, Mandakini1 aDeshpande, Aparna1 aKelkar, Sarika1 aOgale, Satishchandra uhttps://library.ncl.res.in/content/water-electrolysis-conducting-carbon-cloth-subthreshold-hydrogen-generation-and01699nas a2200157 4500008004100000245007200041210006900113260000800182300001000190490001100200520116500211100001801376700001901394700002201413856010601435 2017 eng d00aRevisiting HOPG superlattices: structure and conductance properties0 aRevisiting HOPG superlattices structure and conductance properti cAPR a55-600 v 658 3 aSuperlattices observed on highly oriented pyrolytic graphite (HOPG) have been studied extensively by scanning tunnelling microscopy (STM). The interest in the study of graphite superlattices has seen a resurgence since the discovery of graphene. Single layer graphene, bilayer graphene, and few layer graphene can now be grown on different substrates. The adherence of graphene to various substrates often leads to a periodic out-of-plane modulation and superlattices due to lattice mismatch. In this paper, we report STM imaging and scanning tunnelling spectroscopy (STS) of different kinds of superlattices on HOPG characterized by a variation in lattice periodicities. Our study also shows evidence of the displacement of the topmost HOPG layer by scanning different areas of the same superlattice. A correlation between the lattice periodicity with its conductance properties is derived. The results of this work are important for understanding the origin of the superlattice structure on HOPG. Investigation of such superlattices may open up possible ways to modify two dimensional electron systems to create materials with tailored electronic properties.1 aPatil, Sumati1 aKolekar, Sadhu1 aDeshpande, Aparna uhttps://library.ncl.res.in/content/revisiting-hopg-superlattices-structure-and-conductance-properties01950nas a2200253 4500008004100000022001400041245010600055210006900161260000800230300002300238490000700261520108800268653001901356653001401375653002801389100002201417700001701439700002201456700001801478700002201496700001901518700002801537856013101565 2018 eng d a1022-976000aPhenazine-containing poly(phenylenevinylene): a new polymer with impressive field emission properties0 aPhenazinecontaining polyphenylenevinylene a new polymer with imp cFEB aArticle Number: 610 v253 a

Phenazine-containing poly(phenylenevinylene) (P(PHN-PV)) was synthesized using Wittig-Horner polycondensation of the appropriately designed monomers viz. 5,10-dioctyl-5,10-dihydrophenazine-2,7-dicarbaldehyde and tetraethyl ((2,5-bis((2-ethylhexyl) oxy)-1,4 phenylene) bis(methylene)) bis(phosphonate). The design embraces the specific motivation of incorporating the nitrogen-containing heterocycle viz. .phenazine in poly(phenylenevinylene) backbone. P(PHN-PV) exhibited reversible redox properties. In the field emission measurements performed on the film of P(F'HN-PV), the turn-on field was observed to be 1.93 V/mu m for the current density of 10 mu A/cm(2). The maximum current density of similar to 4.87 mA/cm(2) was achieved at the applied field of 3.84 V/mu m. The emission current showed impressive stability for 6 h at a constant current of 1 mu A (current density of about 20 mu A/cm(2)). These results emphasize the role of phenazine heterocycle with lone pair of electrons on nitrogen in lowering the oxidation onset and in turn reduction of the turn-on voltage.

10afield emission10aPhenazine10aPoly(phenylenevinylene)1 aChhatre, Shraddha1 aIchake, Amol1 aHarpale, Kashmira1 aPatil, Sumati1 aDeshpande, Aparna1 aMore, Mahendra1 aWadgaonkar, Prakash, P. uhttps://library.ncl.res.in/content/phenazine-containing-polyphenylenevinylene-new-polymer-impressive-field-emission-properties01467nas a2200205 4500008004100000022001400041245005900055210005800114260000800172300001100180490000800191520084600199100001901045700001901064700002301083700002101106700002101127700002201148856009101170 2024 eng d a2469-995000aUnveiling different structural orderings in Fe5-xGeTe20 aUnveiling different structural orderings in Fe5xGeTe2 cAUG a0751190 v1103 a

We investigate the metallic van der Waals itinerant ferromagnet Fe5-xGeTe2 5 - x GeTe 2 with atomic scale, spatially resolved low-temperature scanning tunneling microscopy (STM), and spectroscopy (STS). STM images unveil / / a new structural order 2a a x 1a a along with the known order 3a a x 3a a manifesting as nonuniform domains. STS shows spatial and energy resolved local density of states that reveal the crucial influence of Fe(1) site occupancy on the system's electronic interactions. Our magnetization measurements show magnetic anomalies at lower temperatures and identify a Curie temperature (Tc) c ) surpassing room temperature. Collectively, our results elucidate the intricate nature of Fe5-xGeTe2 5 - x GeTe 2 and underscore its potential for tunability of spintronics and high-temperature magnetic applications.

1 aWalve, Vaibhav1 aParakh, Piyush1 aRajput, Umashankar1 aMhase, Akash, S.1 aSingh, Kirandeep1 aDeshpande, Aparna uhttps://library.ncl.res.in/content/unveiling-different-structural-orderings-fe5-xgete2