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Carbon Nanotube-Based Hydrogen Gas Sensor Electrochemically Functionalized with Palladium

机译：基于碳纳米管的氢气传感器用钯电化学官能化

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Palladium (Pd) has been widely employed for conventional hydrogen sensors due to the catalytic nature. Pd has been incorporated also with carbon nanotube (CNT) gas sensors for hydrogen sensing. In this study, a liquid-phase electrochemical reaction was proposed to realize a simple and inexpensive fabrication method of a Pd-functionalized CNT hydrogen sensor. The single-walled CNTs were trapped onto a microelectrode under positive dielectrophoresis. The CNT-retaining microelectrode was immersed in a palladium acetate solution together with a graphite rod. DC voltage was applied between the microelectrode (cathode) and the graphite rod (anode) so that palladium acetate could be reduced and catalytic Pd could be electrodeposited on the CNT surface. The CNT sensor could reversibly respond to hydrogen gas in the air in the range of 0.01 % - 1 % concentration at room temperature. It was also demonstrated that the Pd-functionalized CNT gas sensor could be fabricated just by dipping the CNT-retaining microelectrode into an aqueous Pd salt solution without applying DC voltage (electroless redox reaction).
机译：由于催化性质，钯（Pd）已广泛用于常规氢传感器。 PD也已加入碳纳米管（CNT）气体传感器，用于氢感。在该研究中，提出了一种液相电化学反应，以实现PD官能化CNT氢传感器的简单且廉价的制造方法。在正电泳下，单壁CNT被捕获到微电极上。将CNT保持微电极与石墨棒一起浸入乙酸钾溶液中。在微电极（阴极）和石墨杆（阳极）之间施加DC电压，从而可以减少乙酸钯，并且可以在CNT表面上电沉积催化PD。 CNT传感器可以在室温下可逆地响应空气中的氢气，在室温下浓度为0.01％-1％。还证明了PD官能化的CNT气体传感器可以通过将CNT保持微电极浸入到水性PD盐溶液中而不施加DC电压（无电氧化还原反应）。

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