Abstract
A porous gold membrane working electrode was evaluated for amperometric sensing of NO or in air. The Au electrode was evaporated by E-beam onto a porous Teflon substrate and tested in two different geometries: a lab-built universal (U) and a housing (C) used in building sensors for commercial sale. The optimum bias for reduction was determined to be −150 mV vs. Pt/air quasi-reference electrode (Pt/air-QRE) and was +400 mV for NO oxidation. Sensor signals were independent of gas flow rate in both housings at flow rates over 30 cm3/min. NO sensitivity in the U and C housing was 180 and 43 nA/ppm, respectively, and the sensitivity was −100 and −38 nA/ppm, respectively. The U sensor had a limit of detection (LOD) for of 1.3 ppb (signal-to-noise ratio 3σ). The sensor housing design and operating conditions can be directly related to observed analytical performance characteristics. © 2003 The Electrochemical Society. All rights reserved.
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