CuO纳米块的制备及其对正丙醇的气敏性能研究

Preparation of CuO Nanoblock and Gas Sensitivity of N-propanol

以NaCl为模板剂采用简便的水热法制备CuO为敏感材料。利用SEM,XRD,XPS对所制备的CuO进行相关的表征。经过相关测试,表明NaCl既调控Cu O的形貌又改变其气敏性能。在掺入0.3 g NaCl的实验组,颗粒较未掺杂组有了规则的形态,且气敏性能显著提升,最佳工作温度为140℃,灵敏度达26.99,响应恢复时间分别为169 s与153 s。对于连续通入10次100 ppm的正丙醇以及在50天的七次测试里,该元件能保持良好的重复性跟长期稳定性。通过分析材料表面空穴积累层的变化,阐述其气敏机理。

In this paper,Na Cl was used as a template to prepare Cu O as a sensitive material by a simple hydrothermal method.SEM,XRD and XPS were used to characterize the prepared CuO.Related test results showed that NaCl not only regulated the morphology of CuO but also changed its gas-sensing property.In the experimental group doped with 0.3 g NaCl,the particles had a regular shape compared with that of the undoped group,and the gas-sensing property was significantly improved.The optimum working temperature was 140℃,the sensitivity reached 26.99,and the response recovery times were 169 s and 153 s,respectively.In10 consecutive runs of 100 ppm n-propanol and seven tests over 50 days,the device could maintain good repeatability and long-term stability.Its gas-sensing mechanism was expounded by analyzing the change of the hole accumulation layer on the surface of the material.