Hittini Waseem, Abu-Hani Ayah F, Reddy N, Mahmoud Saleh T
Department of Physics, UAE University, Al Ain, United Arab Emirates.
Department of Computer Engineering, German Jordanian University, German, Jordan.
Sci Rep. 2020 Feb 19;10(1):2940. doi: 10.1038/s41598-020-60069-4.
We report on novel, sensitive, selective and low-temperature hydrogen sulfide (HS) gas sensors based on metal-oxide nanoparticles incorporated within polymeric matrix composites. The Copper-Oxide (CuO) nanoparticles were prepared by a colloid microwave-assisted hydrothermal method that enables precise control of nanoparticle size. The sodium carboxymethyl cellulose (CMC) powder with 5% glycerol ionic liquid (IL) was prepared and mixed with different concentrations of CuO NPs (2.5-7.5 wt.%) to produce flexible and semi-conductive polymeric matrix membranes. Each membrane was then sandwiched between a pair of electrodes to produce an HS gas sensor. The temperature-dependent gas sensing characteristics of the prepared sensors were investigated over the temperature ranges from 40 °C to 80 °C. The sensors exhibited high sensitivity and reasonably fast responses to HS gas at low working temperatures and at a low gas concentration of 15 ppm. Moreover, the sensors were highly selective to HS gas, and they showed low humidity dependence, which indicates reliable functioning in humid atmospheres. This organic-inorganic hybrid-materials gas sensor is flexible, with good sensitivity and low power consumption has the potential to be used in harsh environments.
我们报道了基于掺入聚合物基复合材料中的金属氧化物纳米颗粒的新型、灵敏、选择性且低温的硫化氢（HS）气体传感器。氧化铜（CuO）纳米颗粒通过胶体微波辅助水热法制备，该方法能够精确控制纳米颗粒的尺寸。制备了含有5%甘油离子液体（IL）的羧甲基纤维素钠（CMC）粉末，并与不同浓度的CuO纳米颗粒（2.5 - 7.5 wt.%）混合，以制备柔性半导电聚合物基膜。然后将每个膜夹在一对电极之间制成HS气体传感器。在所制备的传感器在40°C至80°C的温度范围内研究了其与温度相关的气敏特性。这些传感器在低工作温度和15 ppm的低气体浓度下对HS气体表现出高灵敏度和相当快的响应。此外，这些传感器对HS气体具有高度选择性，并且显示出低湿度依赖性，这表明在潮湿环境中能可靠运行。这种有机 - 无机杂化材料气体传感器具有柔性，灵敏度高且功耗低，有潜力用于恶劣环境。
