01602nas a2200229 4500008004100000022001400041245010900055210006900164260008100233300001100314490000600325520076600331653000901097653000901106653001801115653001501133653002301148100002301171700002601194700002401220856012801244 2014 eng d a2053-159100aMoS2 nanoparticles and h-BN nanosheets from direct exfoliation of bulk powder: one-step synthesis method0 aMoS2 nanoparticles and hBN nanosheets from direct exfoliation of aTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLANDbIOP PUBLISHING LTDcSEP a0350380 v13 a

We report facile synthesis of MoS2 nanoparticles and h-BN nanosheets using ultrasonication method in suitable solvents such as N-Methyl-2-pyrrolidone and ethylene glycol, respectively. The average size of MoS2 nanoparticles observed from TEM analysis were 4-5 nm and about a few hundreds of nm for h-BN nanosheets. Raman spectroscopy carried out on nanoparticle samples confirms the formation of MoS2 nanoparticles and h-BN nanosheets. UV-vis absorption and photoluminescence (PL) measurements carried out on the products show typical absorption and luminescence spectra of MoS2 and h-BN. Further, we attempted to decorate gold nanoparticles on nanosheets of MoS2 and h-BN which show subsequent change in Raman spectra due to charge transfer interaction.

10ah-BN10aMoS210aNanoparticles10ananosheets10aOptical properties1 aThripuranthaka, M.1 aRout, Chandra, Sekhar1 aLate, Dattatray, J. uhttps://library.ncl.res.in/content/mos2-nanoparticles-and-h-bn-nanosheets-direct-exfoliation-bulk-powder-one-step-synthesis01762nas a2200277 4500008004100000022001400041245006700055210006700122260008100189300001100270490000600281520085000287653003001137653001901167653001501186653001201201653001101213100002301224700002301247700002401270700002301294700001801317700002401335700002601359856009901385 2015 eng d a2053-159100aEnhanced electron field emission from NiCo2O4 nanosheet arrays0 aEnhanced electron field emission from NiCo2O4 nanosheet arrays aTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLANDbIOP PUBLISHING LTDcSEP a0950110 v23 a

Electron emission properties of electrodeposited spinel NiCo2O4 nanosheet arrays grown on Ni foam have been studied. The work function of NiCo2O4 was calculated by density functional theory using the plane-wave basis set and used to estimate the field enhancement factor. The NiCo2O4 nanosheet arrays exhibited a low turn-on field of 1.86 V mu m(-1) at 1 mu A cm(-2) and current density of 686 mu A cm(-2) at 3.2 V mu m(-1), with field enhancement factor beta = 1460 and good field emission current stability. The field emission properties of the NiCo2O4 nanosheet arrays showed enhanced performance compared to chemically prepared NiCo2O4 nanosheets. Hence, the nanosheet arrays have great potential as robust high performance vertical structure electron emitters for future flat panel displays and vacuum electronic device applications.

10aDensity functional theory10afield emission10ananosheets10aNiCo2O410aspinel1 aNaik, Kusha, Kumar1 aKhare, Ruchita, T.1 aGelamo, Rogerio, V.1 aMore, Mahendra, A.1 aThapa, Ranjit1 aLate, Dattatray, J.1 aRout, Chandra, Sekhar uhttps://library.ncl.res.in/content/enhanced-electron-field-emission-nico2o4-nanosheet-arrays-102299nas a2200265 4500008004100000022001400041245012600055210006900181260007300250300001200323490000800335520132700343653001901670653002001689653001601709653001501725100002101740700002801761700002601789700002001815700002301835700002401858700002101882856013001903 2016 eng d a1387-181100aArchitecture of 2D MoS2 nanosheets and 3D CdMoS4 marigold flowers: consequence of annealing on field emission performance0 aArchitecture of 2D MoS2 nanosheets and 3D CdMoS4 marigold flower aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcMAY a573-5790 v2253 a

Herein, we report the field electron emission investigations on template free solvothermally synthesized layered MoS2 nanosheets as well as novel phase of CdMoS4 nanoflowers at the base pressure of similar to 1 x 10(-8) mbar. The turn-on field, threshold field and maximum emission current densities for both MoS2 and CdMoS4 are strongly influenced by thermal annealing in inert atmosphere. The turn on field, required to draw emission current density of 1 mu A/cm(2) is found to be 5.8 and 3.2 V/mu m for pristine and annealed MoS2 at 400 degrees C. In case of as prepared and annealed CdMoS4 sample the turn on field values are found to be similar to 6.2 and 5.0 V/mu m, respectively. The emission current versus time (I-t) plot measured at the preset current values of similar to 1 mu A for pristine and annealed sample indicates stable operation of the emitter. The emission current fluctuations for annealed sample are observed to be less as compared with the pristine sample due to conditioning of the emitter, thereby showing highly stable nature of emitter. Thus, the present result demonstrates the potential of annealed MoS2 nanosheets and CdMoS4 nanoflowers as an emerging materials for micro/nanoelectronics and flat panel field emission display applications. (C) 2016 Elsevier Inc. All rights reserved.

10afield emission10aMoS2 and CdMoS410aNanoflowers10ananosheets1 aKadam, Sunil, R.1 aSuryawanshi, Sachin, R.1 aPanmand, Rajendra, P.1 aMate, Vivek, R.1 aMore, Mahendra, A.1 aLate, Dattatray, J.1 aKale, Bharat, B. uhttps://library.ncl.res.in/content/architecture-2d-mos2-nanosheets-and-3d-cdmos4-marigold-flowers-consequence-annealing-field01926nas a2200193 4500008004100000022001400041245009300055210006900148260007300217300001200290490000800302520119600310653002101506653002101527653002301548653001501571100002401586856012201610 2016 eng d a1387-181100aLiquid exfoliation of black phosphorus nanosheets and its application as humidity sensor0 aLiquid exfoliation of black phosphorus nanosheets and its applic aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcMAY a494-5030 v2253 a

The bulk crystal of black phosphorus was exfoliated by liquid exfoliation method for a duration of 8 h using N-Methyl-2-Pyrrolidone as the solvent. The exfoliated sample was centrifuged at different rpm such as 3000, 5000 and 10,000 to separate out the 2D black phosphorus nanosheets with different thickness and length. The as synthesized black phosphorus nanosheets collected at these rpm values were characterized with TEM, AFM, Raman spectroscopy and Vis-NIR spectroscopy. Further, we investigated the humidity sensing behaviour of the devices fabricated by using these samples. The results obtained show that the device fabricated with black phosphorus nanosheets and nanoparticles obtained by filtration of the sample collected after 10,000 rpm exhibited better performance as compared to the nanosheets collected at 3000 and 5000 rpm. The response and recovery times of devices are found to be promising and better than those of the black phosphorus gas sensor reported earlier. The present investigations open up a new avenue for further studies in improving the performance of black phosphorus nanosheets based gas sensing devices. (C) 2016 Elsevier Inc. All rights reserved.

10ablack phosphorus10aHumidity sensors10aLiquid exfoliation10ananosheets1 aLate, Dattatray, J. uhttps://library.ncl.res.in/content/liquid-exfoliation-black-phosphorus-nanosheets-and-its-application-humidity-sensor02932nas a2200241 4500008004100000022001400041245009600055210006900151260000800220300001000228490000800238520213400246653002002380653001502400653001502415653001902430100002502449700002202474700002302496700002402519700002202543856012502565 2019 eng d a0925-400500aSuperior humidity sensor and photodetector of mesoporous ZnO nanosheets at room temperature0 aSuperior humidity sensor and photodetector of mesoporous ZnO nan cAUG a83-920 v2933 a

Miniaturized sensor technology is vastly demanding multifunctional materials to fulfill many requirements simultaneously; instead of integrating various sensors into a single device. Efficient operation of these miniaturized sensors at room temperature is highly feasible and cost-effective. The humidity sensing and photodetection is precise merit of sensing in special usage like artificial skin. Sensitivity enhancement in both humidity and photodetection required the high surface area for adsorption as well as a high charge transfer mechanism. The two dimensional (2D) zinc oxide nanosheets (ZnO NS) is the ultimate structure for dimensionally confined transport properties owing to the specific surface atomic configuration that results in high sensitivity, low operating temperature, fast response and recovery, and improved selectivity. Furthermore, introducing porosity into 2D nanostructures has opened new opportunities to enhance the efficiency of sensors and detectors via increasing large surface area and tunable physical and chemical properties. Here we report preparation of mesoporous and highly crystalline 2D ZnO NS by a single step, template free, cost-effective chemical method. The structural and morphological characterizations of ZnO NS are carried out using XRD, FESEM, XPS, TEM respectively. The high-resolution TEM images emphasize sheet-like morphology with a thickness of around 18-22 nm. Further the mesoporous ZnO NS (MZNS) with the pore size between 5-10 nm are achieved by simple heat-treatment. XPS and PL study is confirming the oxygen deficiency in MZNS. The MZNS exhibits an excellent responsivity than PZNS with a fast response and rapid recovery time of 25 s and 5 s respectively along with good cyclic stability which is highly crucial for smart humidity sensor. Furthermore, it considerably enhances photo-sensor performance than pristine ZnO NS (PZNS) with (similar to)1 s response time as well as (similar to)1 s recovery time along with better stability. These promising results illustrate the great potential of MZNS for next-generation humidity sensors and photodetectors.

10ahumidity sensor10aMesoporous10ananosheets10aPhoto-detector1 aGupta, Shobhnath, P.1 aPawbake, Amit, S.1 aSathe, Bhaskar, R.1 aLate, Dattatray, J.1 aWalke, Pravin, S. uhttps://library.ncl.res.in/content/superior-humidity-sensor-and-photodetector-mesoporous-zno-nanosheets-room-temperature01727nas a2200217 4500008004100000022001400041245011800055210006900173260000900242300001200251490000700263520099200270653001501262653001001277653002301287653001101310653001901321100002401340700002401364856012101388 2019 eng d a2190-428600aTemperature-dependent Raman spectroscopy and sensor applications of PtSe2 nanosheets synthesized by wet chemistry0 aTemperaturedependent Raman spectroscopy and sensor applications  cFEB  a467-4740 v103 a

We report on a wet chemistry method used to grow PtSe2 nanosheets followed by thermal annealing. The SEM and TEM analysis confirms the formation of PtSe2 nanosheets. Furthermore, XRD, Raman, XPS and SAED patterns were used to analyze the crystal structure and to confirm the formation of the PtSe2 phase. The temperature-dependent Raman spectroscopy investigations were carried out on PtSe2 nanosheets deposited on Si substrates in the temperature range 100-506 K. The shifts in Raman active E-g and A(1g) modes as a function of temperature were monitored. The temperature coefficient for both modes was calculated and was found to match well with the reported 2D transition metal dichalcogenides. A PtSe2 nanosheet-based sensor device was tested for its applicability as a humidity sensor and photodetector. The humidity sensor based on PtSe2 nanosheets showed an excellent recovery time of approximate to 5 s, indicating the great potential of PtSe2 for future sensor devices.

10ananosheets10aPtSe210aRaman spectroscopy10aSensor10athermal effect1 aPawar, Mahendra, S.1 aLate, Dattatray, J. uhttps://library.ncl.res.in/content/temperature-dependent-raman-spectroscopy-and-sensor-applications-ptse2-nanosheets02598nas a2200337 4500008004100000245008900041210006900130260000800199300001000207490000600217520154200223653002201765653001901787653001501806653001501821653000901836100002201845700002301867700002301890700002001913700001901933700002001952700002301972700002001995700001802015700002302033700003102056700003002087700002402117856011902141 2023 eng d00aTitanium trisulfide nanosheets and nanoribbons for field emission- based nanodevices0 aTitanium trisulfide nanosheets and nanoribbons for field emissio cJAN a44-490 v63 a

The field emission (FE) properties of TiS3 nanosheets and nanoribbons, synthesized by direct sulfuration of bulk titanium, are investigated. The nanosheets show an enhanced FE behavior with a low turn-on field of similar to 0.3 V/ mu m, required for drawing an emission current density of similar to 10 mu A/cm2. Interestingly, the TiS3 nanosheet emitter delivered a large emission current density of similar to 0.9 mA/ cm2 at a relatively low applied electric field of similar to 0.4 V/mu m. We have estimated the values of the field enhancement factor (beta), which are found to be similar to 5 x 104 for the TiS3 nanosheet emitter and similar to 4 x 103 for the nanoribbon emitter. We attribute the superior FE performance to the presence of atomically sharp edges and the reduced thickness of TiS3, as reflected in the high value of beta. In fact, the nanosheet sample presents a higher density of ultrathin layers (similar to 12 nm-thick), and thus, they have a larger edge to volume ratio than the nanoribbon samples (which are similar to 19 nm-thick). The superior FE behavior of TiS3 nanosheets over nanoribbons makes them a propitious field emitter and can be utilized for various FE-based applications, demanding large emission currents and lower operational voltages. Moreover, the FE current stability recorded on these samples confirms their promising performance. Thus, the present investigation brings out a great promise of TiS3 nanosheets and nanoribbons as field emitters for vacuum nanoelectronics devices.

10aCurrent stability10afield emission10ananoribbon10ananosheets10aTiS31 aPawbake, Amit, S.1 aKhare, Ruchita, T.1 aIsland, Joshua, O.1 aFlores, Eduardo1 aAres, Jose, R.1 aSanchez, Carlos1 aFerrer, Isabel, J.1 aPawar, Mahendra1 aFrank, Otakar1 aMore, Mahendra, A.1 avan der Zant, Herre, S. J.1 aCastellanos-Gomez, Andres1 aLate, Dattatray, J. uhttps://library.ncl.res.in/content/titanium-trisulfide-nanosheets-and-nanoribbons-field-emission-based-nanodevices