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Preparation of Small‐Particle‐Size, Semiconductor CdS‐Doped Silica Glasses by the Sol–Gel Process
Author(s) -
Nogami Masayuki,
Nagaska Katsumi,
Kato Etsuro
Publication year - 1990
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1990.tb05275.x
Subject(s) - absorption edge , doping , particle size , materials science , sol gel , crystal (programming language) , absorption (acoustics) , grain size , semiconductor , particle (ecology) , analytical chemistry (journal) , chemical engineering , mineralogy , nanotechnology , chemistry , optoelectronics , composite material , organic chemistry , band gap , computer science , engineering , programming language , oceanography , geology
The sol–gel process has been applied successfully to the preparation of small‐particle‐size CdS‐doped silica glasses with a significant quantum size effect. Gels prepared through the hydrolysis of a complex solution of Si(OC 2 H 5 ) 4 and Cd(CH 3 COO) 2 ·2H 2 O were heated at 500°C, then reacted with H 2 S gas to form fine, hexagonal, CdS‐microcrystal‐doped glasses. The optical absorption edge is blue shifted by ∼0.4 eV compared with the bulk absorption value of CdS crystal. This result is interpreted in terms of a quantum‐confinement effect of small crystal size.