01678nas a2200205   4500008004100000022001400041245008500055210006900140260011000209300001600319490000600335520088800341100001801229700002201247700002001269700001801289700003001307700002001337856011501357       2014                        eng d  a2046-206900aPreferential growth of Au on CdSe quantum dots using langmuir-blodgett technique0 aPreferential growth of Au on CdSe quantum dots using langmuirblo  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcNOV  a64535-645410 v43 a<p>Oleyl amine capped CdSe quantum dots (QD) were synthesised by hot injection technique. These QDs formed a self-assembled monolayer on an aqueous subphase of a Langmuir-Blodgett (LB) trough. Here, in this report we introduced a simple but very efficient route to form a metal (Au)-QD hybrid nanostructure via the LB technique. In this method, the metal counterpart of the hybrid nanostructure could be deposited exclusively on one side of the QDs. The formation of stable monolayer of QDs was evidenced from a surface pressure-area (P-A) isotherm. The development of gold tip was confirmed and monitored by detailed TEM study on the monolayer deposited on TEM grids from the LB trough. Other characterizations like UV-Vis spectroscopy, FTIR, XPS and EDX also suggested the same. Oleyl amine was shown to act both as a reducing agent as well as a capping agent in this strategy.</p>1 aDas, Subhasis1 aSatpati, Biswarup1 aChauhan, Himani1 aDeka, Sasanka1 aGopinath, Chinnakonda, S.1 aBala, Tanushree  uhttp://library.ncl.res.in/content/preferential-growth-au-cdse-quantum-dots-using-langmuir-blodgett-technique-002392nas a2200205   4500008004100000022001400041245012000055210006900175260000900244300001400253490000600267520164700273100002301920700001601943700002001959700002901979700003002008700001802038856013002056       2019                        eng d  a2050-748800aPromising visible-light driven hydrogen production from water on a highly efficient CuCo2S4 nanosheet photocatalyst0 aPromising visiblelight driven hydrogen production from water on   cMAR   a6985-69940 v73 a<p>Here we report the development of CuCo2S4 nanosheets (NSs) as a promising semiconductor photocatalyst for the first time for water splitting reactions under visible light ( 420 nm) conditions, without the support of any noble metal co-catalyst. These NSs were produced via a simple hydrothermal route and have desirable properties with a band gap of 2.24 eV, and are photo-catalytically active under visible light with an apparent quantum yield (AQY) of 2.48%. Under visible light, CuCo2S4 NSs exhibit excellent weight-normalized photoactivity that generates approximate to 25900 mol h(-1) H-2 for 1 g of material with sulphide + sulphite as the sacrificial agent under 7.68 mW cm(-2) illumination, which is the best evolution reported for any chalcogenide semiconductor material without any co-catalyst to date with unprecedented long-term operational stability (up to 12 h study time). The rate and number of hydrogen gas molecules produced are 8.2855 x 10(15) s(-1) cm(-2) which remained constant for three catalytic cycles with a turnover frequency (TOF) value of 0.017 s(-1). The effect of Cu substitution on photoactivity was also investigated for comparative studies and it was found that CuCo2S4 NSs show superior activity to Cu0.5Co2.5S4 and Co3S4. These CuCo2S4 NSs absorb the entire visible range of the spectrum from 420 to 800 nm, and have a highly populated density of states at the Fermi level and a high donor concentration of 7.22 x 10(18) cm(-3) which have been evaluated by Mott-Schottky analysis and favourable adsorption of H+ on S-sites and conversion to H-2 corroborate their efficient photocatalytic activity.</p>
1 aChauhan, Meenakshi1 aSoni, Kiran1 aKarthik, P., E.1 aReddy, Kasala, Prabhakar1 aGopinath, Chinnakonda, S.1 aDeka, Sasanka  uhttp://library.ncl.res.in/content/promising-visible-light-driven-hydrogen-production-water-highly-efficient-cuco2s4-nanosheet