Rohman Yadi Mulyadi, Sukowati Riris, Priyanto Aan, Hapidin Dian Ahmad, Edikresnha Dhewa, Khairurrijal Khairurrijal
Department of Physics, Faculty of Mathematics and Naturals Sciences, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung, West Java 40132, Indonesia.
Doctoral Program of Physics, Faculty of Mathematics and Naturals Sciences, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung, West Java 40132, Indonesia.
ACS Omega. 2023 Mar 28;8(14):13342-13351. doi: 10.1021/acsomega.3c00760. eCollection 2023 Apr 11.
This study describes a sensor based on quartz crystal microbalance (QCM) coated by polyacrylonitrile (PAN) nanofibers containing nickel nanoparticles for methanol gas detection. The PAN/nickel nanofibers composites were made via electrospinning and electrospray methods. The QCM sensors coated with the PAN/nickel nanofiber composite were evaluated for their sensitivities, selectivities, and stabilities. The morphologies and elemental compositions of the sensors were examined using a scanning electron microscope-energy dispersive X-ray. A Fourier Transform Infrared spectrometer was used to investigate the elemental bonds within the nanofiber composites. The QCM sensors coated with PAN/nickel nanofibers offered a high specific surface area to enhance the QCM sensing performance. They exhibited excellent sensing characteristics, including a high sensitivity of 389.8 ± 3.8 Hz/SCCM, response and recovery times of 288 and 251 s, respectively, high selectivity for methanol compared to other gases, a limit of detection (LOD) of about 1.347 SCCM, and good long-term stability. The mechanism of methanol gas adsorption by the PAN/nickel nanofibers can be attributed to intermolecular interactions, such as the Lewis acid-base reaction by PAN nanofibers and hydrogen bonding by nickel nanoparticles. The results suggest that QCM-coated PAN/nickel nanofiber composites show great potential for the design of highly sensitive and selective methanol gas sensors.
本研究描述了一种基于石英晶体微天平（QCM）的传感器，该传感器涂覆有含镍纳米颗粒的聚丙烯腈（PAN）纳米纤维，用于甲醇气体检测。PAN/镍纳米纤维复合材料通过静电纺丝和电喷雾方法制备。对涂覆有PAN/镍纳米纤维复合材料的QCM传感器的灵敏度、选择性和稳定性进行了评估。使用扫描电子显微镜-能量色散X射线对传感器的形态和元素组成进行了检查。利用傅里叶变换红外光谱仪研究了纳米纤维复合材料中的元素键。涂覆有PAN/镍纳米纤维的QCM传感器具有高比表面积，可增强QCM传感性能。它们表现出优异的传感特性，包括389.8±3.8 Hz/SCCM的高灵敏度、分别为288和251 s的响应和恢复时间、与其他气体相比对甲醇的高选择性、约1.347 SCCM的检测限（LOD）以及良好的长期稳定性。PAN/镍纳米纤维对甲醇气体的吸附机制可归因于分子间相互作用，如PAN纳米纤维的路易斯酸碱反应和镍纳米颗粒的氢键作用。结果表明，涂覆有QCM的PAN/镍纳米纤维复合材料在设计高灵敏度和选择性甲醇气体传感器方面具有巨大潜力。
