Photocorrosion-Assisted Transformation of Metal Selenide Nanocrystals into Crystalline Selenium Nanowires

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We report the transformation of several metal selenide nanocrystals (NCs), including PbSe, CdSe, ZnSe, and PbSe/CdSe core/shell NCs, in dimethyl sulfoxide (DMSO) in acidic solutions at room temperature. In this study, the DMSO solution of metal selenide NCs was mixed with nitric acid, which was used to adjust the pH of the solution. Upon mixing, the metal selenide NCs readily transformed into crystalline selenium (trigonal structure) nano- or microwires under ambient light, whereas little or no transformation occurred in the dark. Photocorrosion, where the photogenerated carriers within the NCs participate in the cleavage of the metal and selenium atoms, turns out to be responsible for the transformation. DMSO removes organic ligands on the NC surface and creates surface trap sites for photoinduced charge carriers. Then, nitric acid helps shift the reduction potentials, thereby promoting a "cathodic reduction". In this sense, the photocorrosion rate can be controlled by several parameters, such as the absorption cross section of the selenide NCs and the pH. The diameter and shape of the resulting selenium wires help gauge the transformation rate and thus unveil the transformation mechanism.
Publisher
AMER CHEMICAL SOC
Issue Date
2014-03
Language
English
Article Type
Article
Keywords

UNDERPOTENTIAL DEPOSITION; CDTE NANOPARTICLES; LEAD; DYNAMICS

Citation

CRYSTAL GROWTH & DESIGN, v.14, no.3, pp.1258 - 1263

ISSN
1528-7483
DOI
10.1021/cg4017849
URI
http://hdl.handle.net/10203/189327
Appears in Collection
CBE-Journal Papers(저널논문)
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