02567nas a2200205   4500008004100000022001400041245013300055210006900188260011000257300001400367490000700381520171100388100002102099700001802120700002102138700002702159700002102186700002502207856012902232       2007                        eng d  a0959-942800aConfinement of nano CdS in designated glass: a novel functionality of quantum dot-glass nanosystems in solar hydrogen production0 aConfinement of nano CdS in designated glass a novel functionalit  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcAUG  a4297-43030 v173 a<p>The present work is the investigation of our novel approach to designing quantum dot-glass nanosystems by confining nano CdS in designated glass and the first employment of such a quantum dot system in solar hydrogen production. The CdS quantum dots were grown in a special glass matrix, which involved a sequence of steps. The obtained glass was of uniformly bright yellow in color and the bulk glass was pulverized to a fine powder of micron size particles. The glass powder was characterized structurally and morphologically. X-Ray diffraction and electron diffraction patterns reveal a hexagonal crystallite system for the CdS quantum dots. Field emission scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray fluorescence spectroscopy and chemical leaching with HCl studies demonstrate that the 2.5 nm size CdS quantum dots distribute homogeneously in a monodispersed form in the glass domain and on the surface with a ``partially embedded exposure'' configuration. This disposition imparts an excellent photostability against photocorrosion and also a facile catalytic function. Therefore, even a very small amount of CdS quantum dots (0.005 g per gram of glass powder) is able to photodecompose H2S under visible light (lambda &gt;= 420 nm) both in alkaline and pure aqueous media and produce solar hydrogen with markedly high quantum yields of 17.5 and 11.4%, respectively at 470 nm. Salient features like reusability after simple washing, corrosionless-stability and remarkable catalytic activity of this quantum dot-glass nanosystem are brought forth by our novel catalyst design and are much acclaimed in large scale solar H-2 production.</p>1 aKale, Bharat, B.1 aBaeg, Jin-Ook1 aApte, Sanjay, K.1 aSonawane, Ravindra, S.1 aNaik, Sonali, D.1 aPatil, Kashinath, R.  uhttps://library.ncl.res.in/content/confinement-nano-cds-designated-glass-novel-functionality-quantum-dot-glass-nanosystems-0