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Excited electronic states and optical spectra of ZnS and CdS crystallites in the ≊15 to 50 Å size range: Evolution from molecular to bulk semiconducting properties
Abstract
Very small ZnS and CdS crystallites are made and stabilized in aqueous and methanolic media without organic surfactants. Low temperature (−77 °C) synthesis in methanol produces the smallest crystallites, ≈30 Å diameter cubic CdS and <20 Å diameter cubic ZnS. The crystallites are characterized by transmission electron microscopy and in situ optical spectroscopy (λ≳200 nm). The crystallites are too small to exhibit bulk band gaps in their optical spectra. In the band gap region, the small crystallites show a higher energy absorption threshold with a resolved spectral feature (quantum size exciton peak), not present in the spectra of larger crystals. The far ultraviolet spectra are unaffected by size at present resolution. These results can be understood in terms of the crystallite molecular orbitals, and an elementary confined electron and hole model.
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Citations
Cited by
Semiconductor crystallites: a class of large molecules
Steigerwald, M. L., & Brus, L. E. (1990) · Accounts of Chemical Research · doi:10.1021/ar00174a003 · Cited by 992
Self-citationTolbert, S. H., Herhold, A. B., Johnson, C. S., & Alivisatos, A. P. (1994) · Physical Review Letters · doi:10.1103/physrevlett.73.3266 · Cited by 139
Metadata
- Authors
- Rossetti, R., Hull, R., Gibson, J. M., & Brus, L. E.
- Venue
- The Journal of Chemical Physics
- Publisher
- AIP Publishing
- Published
- 1985-01-01
- Volume
- 82
- Issue
- 1
- Pages
- 552-559
- ISSN
- 0021-9606 (ISSN-L)
- 1089-7690
- OpenAlex
- W1600722658
- Cited by
- 574
- References
- 0
- FWCI
- 15.12
- Type
- journal article
- Language
- en
- Open access
- closed
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- CoChat. (2026). Citation check: Excited electronic states and optical spectra of ZnS and CdS crystallites in the ≊15 to 50 Å size range: Evolution from molecular to bulk semiconducting properties. https://app.cochat.ai/papers/10.1063/1.448727
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- Rossetti, R., Hull, R., Gibson, J. M., & Brus, L. E. (1985). Excited electronic states and optical spectra of ZnS and CdS crystallites in the ≊15 to 50 Å size range: Evolution from molecular to bulk semiconducting properties. The Journal of Chemical Physics. https://doi.org/10.1063/1.448727
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