CuO纳米空心球的制备及其NOx气敏研究

摘要

To prepare the room temperature NOx gas sensor with higher sensitivity, faster response and higher selectivity, CuO hollow nanosphere was synthesized by a simple one step liquid backflow method. The characteristics and morphology of the materials were studied by XRD and SEM. The results show that the CuO hollow nano sphere made up of layers CuO flakes is about 500 nm in diameter. When the prepared material is assembled as an electrode for gas sensor, it exhibites excellent gas sensing properties: the highest sensitivity and the fastest response to 100×10–6(volume fraction) NOx, response time is 2.5 s, and the sensitivity is up to 70.96%. The minimum detection limit to NOx is 2×10–6(volume fraction), and the sensitivity is 13.23%.%为了制备高灵敏度、快速响应、高选择性的室温NOx气体传感器,采用简单的一步液相回流法合成出CuO纳米空心球气敏材料.通过XRD、SEM等表征手段对所合成材料的结构和形貌进行研究.结果表明,制备的CuO是由层状纳米片CuO组装成的直径约为500 nm的中空球状颗粒;将其作为电极材料组装成气敏元件,其在室温下对NOx表现出很好的气敏性能:该材料对体积分数100×10–6 NOx的响应时间为2.5 s,灵敏度可达70.96%;对NOx最低检测限为体积分数2×10–6,灵敏度为13.23%.