Preparation of II-VI semiconductor nanocrystallites in a glass matrix using chalcogenizing agent: Application to CdSe
- Univ. Montpellier-2 (France)
A new route for preparing CdX (X = S, Se, Te, S+Se) nanocrystallites dispersed in a sodium borosilicate glass matrix from a hydrogel is proposed. Chalcogenizing complexing molecules -- for instance a mixture of NH{sub 4}SCN + H{sub 2}SeO{sub 3} -- introduced in the starting solution allowed an in situ crystallite preparation concomitant to gel densification. Prevention of crystallite oxidation is thus obtained. Moreover, coalescence is minimized because of the low gel-glass transition temperature. Low temperature absorption spectra have been interpreted in terms of exciton and electron-hole confinements, accounting for both an intrinsic broadening of energy states inside each nanocrystal and a Gaussian size distribution. Crystallite sizes and size dispersion can be adjusted by changing the initial Cd concentration. The crystallinity of the nanoparticles without change in dispersion is strongly improved by thermal treatment above the T{sub g} of the glass matrix.
- OSTI ID:
- 51662
- Report Number(s):
- CONF-940411-; ISBN 1-55899-246-4; TRN: IM9524%%127
- Resource Relation:
- Conference: Spring meeting of the Materials Research Society (MRS), San Francisco, CA (United States), 4-8 Apr 1994; Other Information: PBD: 1994; Related Information: Is Part Of Better ceramics through chemistry VI. Materials Research Society symposium proceedings Volume 346; Cheetham, A.K. [ed.] [Univ. of California, Santa Barbara, CA (United States)]; Brinker, C.J. [ed.] [Sandia National Labs., Albuquerque, NM (United States)]; Mecartney, M.L. [ed.] [Univ of California, Irvine, CA (United States)]; Sanchez, C. [ed.] [Univ. Pierre et Marie Curie, Paris (France)]; PB: 1069 p.
- Country of Publication:
- United States
- Language:
- English
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