Sharma Neeru, Kushwaha Himmat Singh, Sharma S K, Sachdev K
Department of Physics, Malaviya National Institute of Technology Jaipur 302017 India
Materials Research Centre, Malaviya National Institute of Technology Jaipur 302017 India.
RSC Adv. 2020 Jan 7;10(3):1297-1308. doi: 10.1039/c9ra09460a.
In the present report, gas sensing devices based on LaFeO and rGO-LaFeO were fabricated by a photolithography technique. The X-ray diffraction, Raman spectra and FT-IR results confirm the formation of a perovskite phase and composite. XPS and TEM give the chemical compositions for both products. The higher roughness, greater surface area (62.1 m g), larger pore size (16.4 nm) and lower band gap (1.94 eV) of rGO-LaFeO make it a suitable candidate to obtain high sensitivity. The gas sensing performance of the devices was investigated for various concentrations of NO and CO gases at temperatures of 200 and 250 °C. It was observed that the rGO-LaFeO based device exhibited a high relative response (183.4%) for a 3 ppm concentration of NO at a 250 °C operating temperature. This higher response is attributed to the large surface area, greater surface roughness, and numerous active sites of rGO-LaFeO. The gas sensing properties investigated show that rGO-LaFeO is an excellent candidate for an NO sensor.
在本报告中，采用光刻技术制备了基于LaFeO和rGO-LaFeO的气敏器件。X射线衍射、拉曼光谱和傅里叶变换红外光谱结果证实了钙钛矿相和复合材料的形成。X射线光电子能谱和透射电子显微镜给出了两种产物的化学成分。rGO-LaFeO具有更高的粗糙度、更大的表面积（62.1 m²/g）、更大的孔径（16.4 nm）和更低的带隙（1.94 eV），使其成为获得高灵敏度的合适候选材料。在200和250°C的温度下，研究了器件对不同浓度的NO和CO气体的气敏性能。结果表明，基于rGO-LaFeO的器件在250°C的工作温度下，对3 ppm浓度的NO表现出高相对响应（183.4%）。这种更高的响应归因于rGO-LaFeO的大表面积、更大的表面粗糙度和众多活性位点。所研究的气敏特性表明，rGO-LaFeO是一种优异的NO传感器候选材料。
