Silver Oxide Microwires: Electrodeposition and Observation of Reversible Resistance Modulation upon Exposure to Ammonia Vapor
| Autor: | Q. Li, B. J. Murray, Reginald M. Penner, John T. Newberg, and J. C. Hemminger |
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| Rok vydání: | 2005 |
| Předmět: |
Materials science
Scanning electron microscope General Chemical Engineering Nucleation Nanotechnology General Chemistry chemistry.chemical_compound symbols.namesake X-ray photoelectron spectroscopy Chemical engineering Highly oriented pyrolytic graphite Electron diffraction chemistry Electrode Materials Chemistry symbols Raman spectroscopy Silver oxide |
| Zdroj: | Chemistry of Materials. 17:6611-6618 |
| ISSN: | 1520-5002 0897-4756 |
| DOI: | 10.1021/cm051647r |
| Popis: | Wires composed of AgxO (1 < x < 2) with diameters ranging from 0.7 to 1.1 μm were prepared by electrochemical step edge decoration on highly oriented pyrolytic graphite (HOPG) electrode surfaces. AgxO microwires were obtained by the oxidative electrodeposition of AgxO from a pH = 6 acetate-based plating solution. Step edge selectivity, coupled with the high nucleation density necessary for wire formation, required that the electrodeposition be carried out within a potential window of just 10 mV. The resulting microwires were characterized by scanning electron microscopy and electron diffraction, Raman spectroscopy, and X-ray photoelectron spectroscopy. AgxO microwires were transferred from the HOPG surface to a glass surface, and electrical contacts were applied to ensembles of between 5 and 100 transferred microwires. The resistance of these microwire ensembles increased reversibly by up to 5000% upon exposure to NH3 vapor, whereas an irreversible decrease in the wire resistance was seen upon exposure to... |
| Databáze: | OpenAIRE |
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