Zeolite quantum size effects

Raman spectra gave evidence for quantum size effects in CdS clusters confined in zeolite pores.433 The Raman spectra of nanocrystals of CdSi xSex... 

In 1990, Canham reported the room-temperature luminescence of porous silicon.11111 This important discovery has attracted much attention towards an investigation in silicon with the quantum-size effect. Through chemical-vapor deposition, it is also possible to load silicon nanoparticles into zeolite channels and pores. First, disilane is treated with the protons in a zeolite and is grafted to the zeolite walls [Equation (9.13)] ... 

Hgl2 is also a typical semiconductor material, and it is also easy to vaporize after thermal treatment. Therefore, Hgl2 may be loaded into various zeolites through a vapor-transportation approach. Because of the confinement of the zeolite framework, Hgl2 in zeolites may exhibit distinct quantum-size effects. The electronic transition absorption spectrum of Hgl2 loaded in AlPOs-5 single crystals shows an apparent blue-shift, and in... 

The average g-value of metallic Na, reported values [11], Ag = -0.0024 is to be compared with -0.0008 for bulk Na. Whether this difference is due to a quantum size effect cannot be decided, as surface effects and interaction of the metallic cluster with the zeolitic host may also come into play. 

Zeolite-stabihzed oxides are of interest for catalytical application, due to their redox behavior as potential sensor materials and owing to the revealed quantum size effects for highly dispersed semiconductors. 

The quantum effect of reduction of particle size in reducing the band gap of semiconductors and so giving rise to novel optoelectronic properties has stimulated interest in quantum dot inclusion compounds of nanoparticles of semiconductors within zeolite pores.In a pioneering study, Herron and coworkers succeeded in introducing cadmium sulfide clusters within the pores of zeolite Y via the reaction of a cadmium-exchanged zeolite Y with hydrogen sulfide gas (Scheme 6.8). °... 

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