02170nas a2200217   4500008004100000022001400041245009500055210006900150260009500219300001200314490000800326520132600334653001901660653002301679653002001702653002801722653003001750100001801780700003601798856011801834       2006                        eng d  a0021-979700aOrganic dye molecules as reducing agent for the synthesis of electroactive gold nanoplates0 aOrganic dye molecules as reducing agent for the synthesis of ele  a525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USAbACADEMIC PRESS INC ELSEVIER SCIENCEcJUN  a679-6840 v2983 a<p>Highly crystalline, hexagonal and triangular nanoplates of gold are synthesized in high yield by a new wet chemical method using multifunctional molecules. Bismarck brown R (BBR) and Bismarck brown Y (BBY). This method involves a simple approach by keeping a mixture of aqueous HAuCl(4) solution and BBR/BBY solution in presence of poly(vinyl pyrrolidone) for 24 h. These nanostructures show unprecedented electrochemical properties exhibiting Surface confinement effect. The UV-visible (UV-vis) spectrum shows certain distinct features with absorptions at 300, 400,and 650 nm extending up to the near infrared region. Selected area electron diffraction patterns of these nanoparticles show highly oriented (111) crystal facets. X-ray diffraction analysis also confirms the Predominant orientation in the (111) crystal planes with lattice constant similar to 4.07 angstrom of face-centered-cubic (fcc) gold. X-ray photoelectron (XP) and Fourier transform infrared (FTIR) spectroscopic analysis shows the presence of a fraction of reducing molecules as surface passivating agent either in the unreacted molecular state or as a mixture of reacted and unreacted product which probably undergoes charge transfer with gold nanocrystals giving absorption at similar to 300 nm. (c) 2005 Elsevier Inc. All rights reserved.</p>10aBismarck brown10acyclic voltammetry10agold nanoplates10apoly(vinyl pyrrolidone)10asurface plasmon resonance1 aSharma, Jadab1 aVijayamohanan, Kunjukrishna, P.  uhttps://library.ncl.res.in/content/organic-dye-molecules-reducing-agent-synthesis-electroactive-gold-nanoplates-001572nas a2200241   4500008004100000022001400041245008500055210006900140260007700209300001400286490000700300520071100307653000901018653001301027653001801040653001701058653003001075100002801105700002901133700002601162700002501188856011701213       2014                        eng d  a0947-653900aPlasmon-enhanced photocurrent generation from click-chemically modified graphene0 aPlasmonenhanced photocurrent generation from clickchemically mod  aBOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcJUN  a7402-74090 v203 a<p>The visible-light response of Au nanoparticles (AuNPs) assembled on rGO through different molecular bridges was investigated by transient photocurrent generation. We prepared rGO with two self-assembled monolayers (SAMs), one linear and the other with aromatic triazoles through a click cycloaddition reaction. A fivefold photocurrent enhancement was observed for triazole linkers over the aminopropyltrimethoxysilane (APTMS) linker. Cyclic voltammetry (CV) and impedance measurements also suggest fast electron transfer on account of the low resistance offered by the click-modified rGO surface whereby introduction of triazoles offers the efficient bridge between the donor AuNPs and acceptor rGO.</p>10aGold10agraphene10aNanoparticles10aphotophysics10asurface plasmon resonance1 aYenchalwar, Sandeep, G.1 aDevarapalli, Rami, Reddy1 aDeshmukh, Ashvini, B.1 aShelke, Manjusha, V.  uhttps://library.ncl.res.in/content/plasmon-enhanced-photocurrent-generation-click-chemically-modified-graphene-002821nas a2200253   4500008004100000022001400041245010600055210006900161260000800230300001600238490000700254520197500261653001202236653001902248653003002267653000902297653002002306100001602326700002102342700002202363700002002385700003002405856013202435       2019                        eng d  a1944-824400aElectronic integration and thin film aspects of Au-Pd/rGO/TiO2 for improved solar hydrogen generation0 aElectronic integration and thin film aspects of AuPdrGOTiO2 for   cSEP  a32869-328780 v113 a<p>In the present work, we have synthesized noble bimetallic nanoparticles (Au-Pd NPs) on a carbon-based support and integrated with titania to obtain Au-Pd/C/TiO2 and Au-Pd/rGO/TiO2 nanocomposites using an ecofriendly hydrothermal method. Here, a 1:1 (w/w) Au-Pd bimetallic composition was dispersed on (a) high-surface-area (3000 m(2) g(-1)) activated carbon (Au-Pd/C), prepared from a locally available plant source (in Assam, India), and (b) reduced graphene oxide (rGO) (Au-Pd/rGO); subsequently, they were integrated with TiO2. The shift observed in Raman spectroscopy demonstrates the electronic integration of the bimetal with titania. The photocatalytic activity of the above materials for the hydrogen evolution reaction was studied under 1 sun conditions using methanol as a sacrificial agent in a powder form. The photocatalysts were also employed to prepare a thin film by the drop-casting method. Au-Pd/rGO/TiO2 exhibits 43 times higher hydrogen (H-2) yield in the thin film form (21.50 mmol h(-1) g(-1)) compared to the powder form (0.50 mmol h(-1) g(-1)). On the other hand, Au-Pd/C/TiO2 shows 13 times higher hydrogen (H-2) yield in the thin film form (6.42 mmol h(-1) g(-1)) compared to the powder form (0.48 mmol h(-1) g(-1)). While powder forms of both catalysts show comparable activity, the Au-Pd/rGO/TiO2 thin film shows 3.4 times higher activity than that of Au-Pd/C/TiO2. This can be ascribed to (a) an effective separation of photogenerated electron-hole pairs at the interface of Au-Pd/rGO/TiO2 and (b) the better field effect due to plasmon resonance of the bimetal in the thin film form. The catalytic influence of the carbon-based support is highly pronounced due to synergistic binding interaction of bimetallic nanoparticles. Further, a large amount of hydrogen evolution in the film form with both catalysts (Au-Pd/C/TiO2 and Au-Pd/rGO/TiO2) reiterates that charge utilization should be better compared to that in powder catalysts.</p>
10abimetal10aPhotocatalysis10asurface plasmon resonance10aTiO210awater splitting1 aTudu, Bijoy1 aNalajala, Naresh1 aReddy, Kasala, P.1 aSaikia, Pranjal1 aGopinath, Chinnakonda, S.  uhttps://library.ncl.res.in/content/electronic-integration-and-thin-film-aspects-au-pdrgotio2-improved-solar-hydrogen-generation02820nas a2200349   4500008004100000022001400041245014900055210006900204260000800273300001100281490000700292520170300299653001102002653001802013653002302031653002402054653003002078100001802108700001902126700001802145700001802163700002002181700001402201700001602215700001902231700001902250700002002269700001602289700001902305700002102324856012502345       2020                        eng d  a2468-519400aBioinspired synthesis of multifunctional silver nanoparticles for enhanced antimicrobial and catalytic applications with tailored SPR properties0 aBioinspired synthesis of multifunctional silver nanoparticles fo  cSEP  a1002850 v173 a<p>In the developing nanotechnology world, numerous attempts have been made to prepare the nobel metallic nanoparticles (NPs), which can improve their applicability in diverse fields. In the present work, the biosynthesis of silver (Ag) NPs has been successfully achieved through the medicinal plant extract (PE) of G. resinifera and effectively used for the catalytic and antibacterial applications. The size dependant tuneable surface plasmon resonance (SPR) properties attained through altering precursor concentrations. The X-ray and selected area diffraction pattern for Ag NPs revealed the high crystalline nature of pure Ag NPs with dominant (111) phase. The high-resolution TEM images show the nonspherical shape of NPs shifting from spherical, hexagonal to triangular, with wide particle size distribution ranging from 13 to 44 nm. Accordingly, the dual-band SPR spectrum is situated in the UV-Vis spectra validating the non-spherical shape of Ag NPs. The functional group present on the Ag NPs surface was analysed by FT-IR confirms the capping and reducing ability of methanolic PE G. resinifera. Further, the mechanism of antimicrobial activity studied using electron microscope showed the morphological changes with destructed cell walls of E. coli NCIM 2931 and S. aureus NCIM 5021 cells, when they treated with Ag NPs. The Ag NPs were more effective against S. aureus and E. coli with MIC 128 mu g/ml as compared to P. aeruginosa NCIM 5029 with MIC 256 mu g/ml. Apart from this, the reduction of toxic organic pollutant 4-NP to 4-AP within 20 min reveals the excellent catalytic activity of Ag NPs with rate constant k = 15.69 s(-1). (C) 2020 Elsevier Ltd. All rights reserved.</p>
10aAg NPs10aAntibacterial10aCatalytic activity10aGardenia resinifera10asurface plasmon resonance1 aParit, S., B.1 aKarade, V., C.1 aPatil, R., B.1 aPawar, V., N.1 aDhavale, R., P.1 aTawre, M.1 aPardesi, K.1 aJadhav, U., U.1 aDawkar, V., V.1 aTanpure, R., S.1 aKim, J., H.1 aJadhav, J., P.1 aChougale, A., D.  uhttps://library.ncl.res.in/content/bioinspired-synthesis-multifunctional-silver-nanoparticles-enhanced-antimicrobial-and02578nas a2200217   4500008004100000022001400041245015200055210006900207260000800276490000700284520173800291653003002029653003702059653003002096653001702126100002502143700002202168700002602190700001802216856012602234       2024                        eng d  a0934-086600aUltra-small Au nanoclusters with tailored photoluminescence properties using modified thiol ligands: a computational and experimental demonstration0 aUltrasmall Au nanoclusters with tailored photoluminescence prope  cOCT0 v413 a<p>
	Au nanoclusters with tailored photoluminescence can be obtained through controlled nanoparticle ligand interface chemistry. The present work reports molecular gold nanoclusters with tuneable photoluminescence emission from 600 to 700 nm using N,N `,N `'-trialkyl (11-mercaptoundecyl)ammonium chloride ligands as capping-agents. The tunability within red spectral region is regulated through specific interface chemistry between gold nanoclusters of molecular range and functional groups of the quaternary ammonium head over N,N `,N `'-trialkyl(11-mercaptoundecyl)ammonium chloride. Combined understanding obtained from the spectroscopy, microscopy, and density functional theory studies demonstrate that the functional group specific electronic interactions at the interfaces steer the emission characteristics of ``molecular'' Au nanoparticles. The study clearly identifies that bulkier functional groups, i.e., triethyl, tripropyl, tributyl, and dimethyl benzene over N+ (of thiol ligand) through their steric effects minimize the particle size giving rise to tunable photoluminescence emission in red spectral region. However, the red shift seen in the emission Au nanoclusters with N-(11-mercaptoundecyl)-N,N `-dimethylbenzenammonium chloride ligand in contradiction to particle size effect is computationally proved to be due to the delocalization of electron density from benzene aromatic ring to N+ of ammonium head leading to a reduction in the HOMO-LUMO energy gap. Fluorescence properties of water dispersible Au nanoclusters are tuned by varying the ammonium head group. Density Functional Theory studies correlate the distinction in emission when head group is phenyl to charge transfer characteristics. image</p>
10aDensity functional theory10aphotoluminescent Au nanoclusters10asurface plasmon resonance10athiol ligand1 aChahande, Anurag, M.1 aMaibam, Ashakiran1 aKrishnamurty, Sailaja1 aDevi, Nandini  uhttps://library.ncl.res.in/content/ultra-small-au-nanoclusters-tailored-photoluminescence-properties-using-modified-thiol