Template-assisted synthesis of CdS nanocrystal arrays in chemically inhomogeneous pores using a vapor–solid mechanism

An ordered array of CdS nanocrystals was synthesized by a vapor–solid mechanism using a template of chemically inhomogeneous pores in the form of nanocavities in a thin silicon nitride layer on a SiO 2 /Si wafer. The silicon oxide at the bottom of the Si 3 N 4 cavities served for nucleation of the C...

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Bibliographic Details
Published in:RSC advances 2015-01, Vol.5 (35), p.27496-27501
Main Authors: Grynko, Dmytro O., Fedoryak, Alexander N., Dimitriev, Oleg P., Lin, Andrew, Laghumavarapu, Ramesh B., Huffaker, Diana L., Kratzer, Markus, Piryatinski, Yuri P.
Format: Article
Language:English
Subjects:
Arrays
Cadmium sulfides
Morphology
Nanocrystals
Nucleation
Porosity
Silicon dioxide
Silicon nitride
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Summary:An ordered array of CdS nanocrystals was synthesized by a vapor–solid mechanism using a template of chemically inhomogeneous pores in the form of nanocavities in a thin silicon nitride layer on a SiO 2 /Si wafer. The silicon oxide at the bottom of the Si 3 N 4 cavities served for nucleation of the CdS crystals, whereas no affinity of CdS to silicon nitride was found. Tetra- and multi-pod morphologies of the nanocrystals have been obtained. These morphologies were attributed to a competition between nucleation rates and growth of different crystallographic planes at the Si 3 N 4 /SiO 2 and Si 3 N 4 /CdS interfaces, which is different from the polymorphism growth model.
ISSN:2046-2069
2046-2069
DOI:10.1039/C5RA01175B