| Title: | Double-Step Modulation of the Pulse-Driven Mode for a High-Performance SnO(2) Micro Gas Sensor: Designing the Particle Surface via a Rapid Preheating Process |
| Author(s): | Suematsu K; Hiroyama Y; Harano W; Mizukami W; Watanabe K; Shimanoe K; |
| Address: | "Department of Advanced Materials Science and Engineering, Faculty of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816-8580, Japan. Department of Molecular and Material Science, Interdisciplinary Graduate School of Engineering Science, Kyushu University, Kasuga, Fukuoka 816-8580, Japan. Center for Quantum Information and Quantum Biology, Institute for Open and Transdisciplinary Research Initiatives, Graduate School of Engineering Science, Osaka University, Osaka 560-8531, Japan" |
| DOI: | 10.1021/acssensors.0c01365 |
| ISSN/ISBN: | 2379-3694 (Electronic) 2379-3694 (Linking) |
| Abstract: | "To improve the sensing properties toward volatile organic compound gases, a preheating process was introduced in a miniature pulse-driven semiconductor gas sensor, using SnO(2) nanoparticles. The miniature sensor went through a short preheating span at a high temperature before being cooled and then experienced a measurement span under heating; this is the double-pulse-driven mode. This operating profile resulted in the modification of the surface conditions of naked SnO(2) nanoparticles to facilitate the adsorption of O(2-) and ethanol-based adsorbates. Temperature-programmed reaction measurement results show that ethanol gas was adsorbed onto the SnO(2) surface at 30 degrees C, and the adsorption amount of ethanol and its byproducts was increased after ethanol exposure at high temperatures followed by cooling. The electrical resistance of the sensor in synthetic air increased as the preheating temperature increased. The sensor responses, S(i) and S(e), to 1 ppm ethanol at 250 degrees C were enhanced by introducing the preheating process; S(i) values at 250 degrees C with and without preheating at 300 degrees C are 40 and 15, respectively. The obtained improvements were attributed to an increase in O(2-) adsorption onto the SnO(2) surface during the preheating phase. During the cooling phases, the adsorption of ethanol-based molecules onto the SnO(2) surface and their condensation in the sensing layer contributed to the enhanced performance. In addition, the double-pulse-driven mode improves the recovery speed in the electrical resistance after gas detection. These improvements made in the sensing properties of the double-pulse-driven semiconductor gas sensors provide desirable advantages for healthcare and medical devices" |
| Keywords: | Gases Semiconductors Temperature *Tin Compounds *Volatile Organic Compounds SnO2 semiconductor gas sensor ethanol adsorption gas condensation oxygen adsorption species preheating process; |
| Notes: | "MedlineSuematsu, Koichi Hiroyama, Yuki Harano, Wataru Mizukami, Wataru Watanabe, Ken Shimanoe, Kengo eng Research Support, Non-U.S. Gov't 2020/09/24 ACS Sens. 2020 Nov 25; 5(11):3449-3456. doi: 10.1021/acssensors.0c01365. Epub 2020 Oct 2" |
