Quantitative Hydrocarbon Sensor for Ultra High Vacuum Applications
| Autor: | Richard M. Lambert, Georgios Kyriakou, David J. Davis, Robert B. Grant, Mintcho S. Tikhov |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
chemistry.chemical_classification
Working electrode Ultra-high vacuum Analytical chemistry chemistry.chemical_element Partial pressure Electrochemistry Oxygen Surfaces Coatings and Films Electronic Optical and Magnetic Materials General Energy Hydrocarbon chemistry Physical and Theoretical Chemistry Platinum Carbon |
| Zdroj: | The Journal of Physical Chemistry C. 111:1491-1495 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/jp0664364 |
| Popis: | A promising new quantitative sensing device intended for hydrocarbon detection under stringent technological conditions is described. It exhibits good sensitivity and reproducibility, as well as a useful degree of selectivity. The sensor is based on a novel approach that exploits the well-known properties of the oxygen/yttria-stabilized zirconia/platinum solid-state electrochemical system. Correlated spectroscopic and electrochemical measurements provide fundamental insight into the mode of action under potentiostatic conditions: the potential of the working electrode is set by the steady-state coverage of chemisorbed oxygen, which itself depends on the balance between rate of oxygen pumping to the Pt surface and the hydrocarbon impingement rate. Good quantitative agreement between theoretically predicted and measured hydrocarbon partial pressures is found. Nonlinearities that occur at sufficiently high hydrocarbon pressure are associated with the accumulation of small amounts of carbon at the surface of... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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