Kang Jingu, Kim Kyung-Tae, Jeon Seoung-Pil, Facchetti Antonio, Kim Jaekyun, Park Sung Kyu
School of Electrical and Electronic Engineering, Chung-Ang University Seoul 06974 Republic of Korea
Department of Chemistry and the Materials Research Center and the Argonne-Northwestern Solar Energy Research Center, Northwestern University Evanston Illinois 60208 USA.
RSC Adv. 2019 Feb 20;9(11):6193-6198. doi: 10.1039/c8ra09917k. eCollection 2019 Feb 18.
In this study, we fabricated a transparent Pt-decorated indium gallium zinc oxide (IGZO) thin film based on a solution process to demonstrate a portable, low-cost volatile organic compound (VOC) based real-time monitoring system with the detection capability at as low as 1 ppm. The Pt/IGZO sensor shows remarkable response characteristics upon exposure of isobutylene (2-methylpropene) gas down to 1 ppm while also maintaining the reliability and reproducibility of the sensing capability, which is almost comparable to a commercial VOC sensor based on a photoionization detector (PID) method. For 1 ppm of isobutylene gas, the response and recovery time of the sensor estimated were as low as 25 s ( ) and 80 s ( ), respectively. The catalytic activity of Pt nanoparticles on an IGZO nano-thin film plays a key role in drastically enhancing the sensitivity and dynamic response behaviour of the VOC sensor. Furthermore, the solution-processed IGZO thin film decorated with Pt nanoparticles also represents a highly transparent (in visible region, ∼90%) and low-cost fabrication platform, thereby, facilitating the optical visibility and disposability for future applications in the field of electronics. Therefore, we believe that the nano-Pt/IGZO hybrid material for VOC sensor developed by us will pave a way to detect any harmful chemical gases and VOCs in various environments.
在本研究中，我们基于溶液法制备了一种透明的铂修饰铟镓锌氧化物（IGZO）薄膜，以展示一种便携式、低成本的基于挥发性有机化合物（VOC）的实时监测系统，其检测能力低至1 ppm。Pt/IGZO传感器在暴露于低至1 ppm的异丁烯（2-甲基丙烯）气体时表现出显著的响应特性，同时还保持了传感能力的可靠性和可重复性，这几乎与基于光电离探测器（PID）方法的商用VOC传感器相当。对于1 ppm的异丁烯气体，估计该传感器的响应时间和恢复时间分别低至25 s（ ）和80 s（ ）。IGZO纳米薄膜上的铂纳米颗粒的催化活性在大幅提高VOC传感器的灵敏度和动态响应行为方面起着关键作用。此外，用铂纳米颗粒修饰的溶液法制备的IGZO薄膜还代表了一个高度透明（在可见光区域，约90%）且低成本的制造平台，从而有利于在电子领域未来应用中的光学可视性和一次性使用。因此，我们相信我们开发的用于VOC传感器的纳米Pt/IGZO混合材料将为检测各种环境中的任何有害化学气体和VOCs铺平道路。
