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ACS Appl Mater Interfaces

Title:		Impact Ionization Induced by Accelerated Photoelectrons for Wide-Range and Highly Sensitive Detection of Volatile Organic Compounds at Room Temperature
Author(s):		Kang Y; Pyo S; Jeong HI; Lee K; Baek DH; Kim J;
Address:		"School of Mechanical Engineering , Yonsei University , 50 Yonsei-ro, Seodaemun-gu , Seoul 03722 , Republic of Korea"
Journal Title:		ACS Appl Mater Interfaces
Year:		2019
Volume:		20190522
Issue:		22
Page Number:		20491 - 20499
DOI:		10.1021/acsami.9b02153
ISSN/ISBN:		1944-8252 (Electronic) 1944-8244 (Linking)
Abstract:		"Ionization-based volatile organic compound (VOC) sensors that use photons or electrons operating at room temperature have attracted considerable attention as a promising alternative to conventional metal oxide-based sensors that require high temperature for sensing function. However, the photoionization sensors cannot ionize many gas species for their limited photon energy, and field emission-based ionization sensors that rely on the breakdown voltage of specific gas species in a pure state may not tell different concentration. This work demonstrates the detection of VOCs using impact ionization induced by accelerated photoelectrons. Although the photoelectrons emitted by relatively low photon energy typically have insufficient kinetic energy to cause impact ionization, in this approach, they are accelerated between microgap electrodes to enhance their kinetic energy such that the impact ionization of VOCs can be achieved. The demonstrated gas sensor sensitively detects toluene concentration in a wide range from 1000 ppm to 100 ppb with fast response and recovery time at room temperature. Additionally, diverse VOC species including benzene, p-xylene, and even acetylene with high ionization energy can be detected. The proposed method could be a viable solution for VOC sensors with low cost, scalable producibility, and high performance"
Keywords:		acceleration gas sensor impact ionization photoelectron volatile organic compounds;
Notes:		"PubMed-not-MEDLINEKang, Yunsung Pyo, Soonjae Jeong, Han-Il Lee, Kyounghoon Baek, Dae-Hyun Kim, Jongbaeg eng 2019/05/09 ACS Appl Mater Interfaces. 2019 Jun 5; 11(22):20491-20499. doi: 10.1021/acsami.9b02153. Epub 2019 May 22"