Nanoscale Chemical Imaging of Zinc Oxide Nanowire Corrosion
| Autor: | Kent A. Meyer, Katherine Cimatu, Shannon M. Mahurin, Robert W. Shaw |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Chemical imaging
Materials science business.industry Nanowire chemistry.chemical_element Second-harmonic generation Nanotechnology Zinc Surfaces Coatings and Films Electronic Optical and Magnetic Materials Corrosion General Energy chemistry Optoelectronics Nanometre Physical and Theoretical Chemistry business Spectroscopy Nanoscopic scale |
| Zdroj: | The Journal of Physical Chemistry C. 116:10405-10414 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/jp301922a |
| Popis: | The ability to monitor corrosion on a nanometer scale is a powerful tool for a fundamental understanding of surface chemical processes. Nanoscale chemical images of individual bare and alumina-coated zinc oxide nanowires (NWs) were recorded using tip-enhanced second harmonic generation (SHG) spectroscopy before and after exposure to carbon dioxide and water vapor. Images were collected for the same bare nanowire after each successive two-day exposure period. Corrosion of the bare ZnO NW to zinc carbonate was evident from far-field and near-field SHG images and simultaneously recorded atomic force microscopy (AFM) data. The expected zinc carbonate corrosion product is SHG inactive. The AFM profile of the NW showed vertical and lateral expansion in different regions of the nanowire. The lower resolution far-field SHG signal decreased gradually and uniformly. The near-field SHG signal provided a profile of the evolving NW with a spatial resolution approaching 100 nm. In contrast, exposed alumina-coated ZnO N... |
| Databáze: | OpenAIRE |
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