Epitaxial growth and photochemical annealing of graded CdS/ZnS shells on colloidal CdSe nanorods

Journal Article · Thu Feb 14 04:00:00 EST 2002 · Journal of the American Chemical Society

DOI:https://doi.org/10.1021/ja025946i· OSTI ID:799614

Manna, Liberato ^[1]; Scher, Erik C; Li, Liang-shi; Alivisatos, A Paul

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1. LBNL Library

We report the preparation and structural characterization of core/shell CdSe/CdS/ZnS nanorods. A graded shell of larger band gap is grown around CdSe rods using trioctylphosphine oxide as a surfactant. Interfacial segregation is used to preferentially deposit CdS near the core, providing relaxation of the strain at the core/shell interface. The reported synthesis allows for variation of the shell thickness between one and six monolayers, on core nanorods ranging from aspect ratios of 2:1 to 10:1. After an irreversible photochemical annealing process, the core/shell nanorods have increased quantum efficiencies and are stable in air under visible or UV excitation. In addition to their robust optical properties, these samples provide an opportunity for the study of the evolution of epitaxial strain as the shape of the core varies from nearly spherical to nearly cylindrical.

• Research Organization: Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
• Sponsoring Organization: USDOE Director, Office of Science. Office of Basic Energy Studies. Materials Science and Engineering Division; DARPA 066995 (US)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 799614
• Report Number(s): LBNL--50555; B& R KC0203010
• Journal Information: Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 24 Vol. 124; ISSN JACSAT; ISSN 0002-7863
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AIR
ANNEALING
ASPECT RATIO
EXCITATION
OPTICAL PROPERTIES
RELAXATION
SEGREGATION
SHAPE
STRAINS
SYNTHESIS
THICKNESS
TOPO