TY - JOUR
T1 - High-resolution electron microscopy and microanalysis of cds and cdte quantum dots in glass matrices
AU - Liu, Li Chi
AU - Kim, M. J.
AU - Risbud, Subhash H.
AU - Carpenter, Ray
N1 - Funding Information:
ACKNOWLEDGMENTS The synthesis and optical spectroscopy research in this paper was supported by the National Science Foundation (NSFtIndustry Optical Circuitry Cooperative. The electron microscopy research was supported by DuPont Committee for Educational Aid and made use of the HREM Facility supported by NSF Division of Materials Research (DMR), in the Center for Solid State Science at Arizona State University.
PY - 1991/3
Y1 - 1991/3
N2 - CdS and CdTe quantum dots (QDs) precipitated from borosilicate glass matrices, exhibiting quantum confinement effects, have been characterized by optical spectroscopy and high-spatial-resolution electron microscopy. The particles appear to have formed initially by homogeneous nucleation and were randomly distributed, but the morphology of the particles and therefore growth processes differ. The CdTe particles were spherical single crystals, often with small facets on {111} planes, or at most bicrystals. The measured average diameter of these particles was about 14 nm. They had a zinc-blende cubic structure with lattice constant corresponding to bulk CdTe crystals. For CdS the particles were relatively large polycrystals, composed of smaller single crystals, whose size was about 3·3 nm. The structure of these nanocrystals was wurzite-type hexagonal, with a lattice corresponding to CdS. Particle-size effects on absorption peak shifts were observed for both CdTe and CdS samples. Microscopically observed QD sizes were compared with predictions of theoretical models based on optical absorption features of quantum confined structures.
AB - CdS and CdTe quantum dots (QDs) precipitated from borosilicate glass matrices, exhibiting quantum confinement effects, have been characterized by optical spectroscopy and high-spatial-resolution electron microscopy. The particles appear to have formed initially by homogeneous nucleation and were randomly distributed, but the morphology of the particles and therefore growth processes differ. The CdTe particles were spherical single crystals, often with small facets on {111} planes, or at most bicrystals. The measured average diameter of these particles was about 14 nm. They had a zinc-blende cubic structure with lattice constant corresponding to bulk CdTe crystals. For CdS the particles were relatively large polycrystals, composed of smaller single crystals, whose size was about 3·3 nm. The structure of these nanocrystals was wurzite-type hexagonal, with a lattice corresponding to CdS. Particle-size effects on absorption peak shifts were observed for both CdTe and CdS samples. Microscopically observed QD sizes were compared with predictions of theoretical models based on optical absorption features of quantum confined structures.
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U2 - 10.1080/13642819108225985
DO - 10.1080/13642819108225985
M3 - Article
AN - SCOPUS:0026120118
VL - 63
SP - 769
EP - 776
JO - Philosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties
JF - Philosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties
SN - 1364-2812
IS - 3
ER -