Epitaxial growth and photochemical annealing of graded CdS/ZnS shells on colloidal CdSe nanorods
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:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- 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; JACSAT; R&D Project: 516070; B& R KC0203010; TRN: US200218%%290
- Journal Information:
- Journal of the American Chemical Society, Vol. 124, Issue 24; Other Information: Journal Publication Date: June 19, 2002; PBD: 14 Feb 2002; ISSN 0002-7863
- Country of Publication:
- United States
- Language:
- English
Similar Records
Using shape to control photoluminescence from CdSe/CdS core/shell nanorods.
Expanding the One-Dimensional CdS-CdSe Composition Landscape: Axially Anisotropic CdS{sub 1-x}Se{sub x} Nanorods