【摘要】 采用简单的水热法合成了多孔花状CuO/ZnO纳米材料，用于室温下空气中甲醛的高效检测.实验结果表明，CuO/ZnO纳米材料对甲醛的响应在0.9 ppm时达到了12.99%,在19.1 ppm时达到了152.39%,分别是纯ZnO响应度的5.59倍和6.51倍.计算得到的CuO/ZnO纳米材料的甲醛检测限低至0.476 ppm.CuO/ZnO对2 ppm甲醛的响应时间比ZnO快了16 s.表面光电压测量实验结果证实了CuO/ZnO的优异甲醛传感性能主要归因于p-n异质结促进了光生载流子的有效分离.本文为高性能气体传感材料的开发提供了一种可行方案.更多还原

【Abstract】 Utilizing a straightforward hydrothermal approach, porous flower-like CuO/ZnO nanomaterial was synthesized to enable high-performance formaldehyde gas sensing at room temperature.It′s demonstrated that the formaldehyde response of the CuO/ZnO nanomaterial reached 12.99% at 0.9 ppm and 152.39% at 19.1 ppm, which is about 5.59 times and 6.51 times higher than pure ZnO.The calculated formaldehyde detection limit of CuO/ZnO nanomaterial is as low as 0.476 ppm.The response time of CuO/ZnO to 2 ppm formaldehyde is 16 s faster than that of ZnO.The excellent formaldehyde sensing performance of CuO/ZnO is mainly attributed to the efficient separation of charge carriers promoted by the p-n heterojunction, which is confirmed by experimental results obtained from surface photovoltage measurements.This study provides valuable insights and references for the development of high-performance gas-sensing materials.更多还原