1. Anisotropic Etching of Semiconductor Nanocrystals
- Author
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Sung Jun Lim, Sunghan Jung, Wonjung Kim, Seung Koo Shin, and Jongcheol Seo
- Subjects
Materials science ,General Chemical Engineering ,Chloromethane ,fungi ,Inorganic chemistry ,technology, industry, and agriculture ,Nanowire ,macromolecular substances ,General Chemistry ,Chloride ,Isotropic etching ,chemistry.chemical_compound ,stomatognathic system ,X-ray photoelectron spectroscopy ,Chemical engineering ,chemistry ,Etching (microfabrication) ,Materials Chemistry ,medicine ,Nanorod ,Reactive-ion etching ,medicine.drug - Abstract
The size and shape of CdSe nanorods, CdSe tetrapods, and CdS nanowires were tailored by chemical and photochemical etchings in chloromethane solvents. Nanocrystals were synthesized by colloidal growth, and their sizes and shapes were visualized by transmission electron microscopy before and after etching. Crystal structures were confirmed by X-ray diffraction, and optical properties were monitored during etching. Chemical etching with tributylphosphine preferentially shortens the length of nanocrystals, whereas photochemical etching with both primary alkylamine and tributylphosphine reduces the diameter more than the length. The surface of etched nanocrystals was characterized by X-ray photoelectron spectroscopy, and the etching products dissolved in solvent were analyzed by matrix-free laser desorption ionization mass spectrometry. Spectroscopic results suggest that the chloride ion is the active species: Chloride ions are generated either by chemical activation of chloromethane solvents with tributylpho...
- Published
- 2011
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