Scanning Tunneling Microscope Excited Cathodoluminescence from ZnS Nanowires

The electronic excitation spectrum of ZnS nanowires (NWs) is characterized by cathodoluminescence (CL) excited using the tip of a scanning tunneling microscope as a highly localized and bright source of low-energy (150−350 eV) electrons with impinging power densities in the range of up to 60 kW/cm2...

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Bibliographic Details
Published in:Nano letters 2006-05, Vol.6 (5), p.926-929
Main Authors: Ma, Dorothy Duo Duo, Lee, Shuit-Tong, Mueller, Peter, Alvarado, Santos F.
Format: Article
Language:English
Subjects:
Cathodoluminescence, ionoluminescence
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cross-disciplinary physics: materials science
rheology
Electrochemistry
Exact sciences and technology
Luminescence
Materials science
Microscopy, Scanning Tunneling
Nanoscale materials and structures: fabrication and characterization
Nanotechnology
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Other luminescence and radiative recombination
Other topics in nanoscale materials and structures
Photoluminescence
Physics
Quantum wires
Sulfides
Zinc Compounds
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Summary:The electronic excitation spectrum of ZnS nanowires (NWs) is characterized by cathodoluminescence (CL) excited using the tip of a scanning tunneling microscope as a highly localized and bright source of low-energy (150−350 eV) electrons with impinging power densities in the range of up to 60 kW/cm2 or more. The CL spectra reveal significant differences when compared with the photoluminescence spectra of ZnS NWs. The differences can be associated with the properties of the surface region of the NWs, which are preferentially emphasized in the CL spectra owing to the small probing depth of low-energy electrons.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl052507j