Department of Chemistry, University of California, Irvine, California 92697-2025, United States.
Anal Chem. 2011 Dec 15;83(24):9472-7. doi: 10.1021/ac2021745. Epub 2011 Nov 14.
The electrical resistance, R, of an array of 30 palladium nanowires is used to detect the concentration of dissolved hydrogen gas (H(2)) in transformer oil over the temperature range from 21 to 70 °C. The palladium nanowire array (PdNWA), consisting of Pd nanowires ∼100 nm (width), ∼20 nm (height), and 100 μm (length), was prepared using the lithographically patterned nanowire electrodeposition (LPNE) method. The R of the PdNWA increased by up to 8% upon exposure to dissolved H(2) at concentrations above 1.0 ppm and up to 2940 ppm at 21 °C. The measured limit-of-detection for dissolved H(2) was 1.0 ppm at 21 °C and 1.6 ppm at 70 °C. The increase in resistance induced by exposure to H(2) was linear with H(2)(1/2) across this concentration range. A PdNWA sensor operating in flowing transformer oil has functioned continuously for 150 days.
钯纳米线阵列（PdNWA）的电阻用于检测变压器油中溶解氢气（H2）的浓度，其在 21 至 70°C 的温度范围内由 30 根钯纳米线组成。钯纳米线阵列（PdNWA）由宽度约为 100nm、高度约为 20nm、长度为 100μm 的钯纳米线组成，是采用光刻图案纳米线电沉积（LPNE）方法制备的。在 21°C 时，浓度高于 1.0ppm 且高达 2940ppm 的溶解 H2 会使 PdNWA 的电阻增加高达 8%。在 21°C 时，测量到的溶解 H2 的检测限为 1.0ppm，在 70°C 时为 1.6ppm。暴露于 H2 引起的电阻增加与该浓度范围内的H2(1/2)呈线性关系。在流动的变压器油中运行的 PdNWA 传感器已连续运行了 150 天。
