title: Real-time detection of chlorine gas using Ni/Si shell/core nanowires.
abstract: We demonstrate the selective adsorption of Ni/Si shell/core nanowires (Ni-Si NWs) with a Ni outer shell and a Si inner core on molecularly patterned substrates and their application to sensors for the detection of chlorine gas, a toxic halogen gas. The molecularly patterned substrates consisted of polar SiO2 regions and nonpolar regions of self-assembled monolayers of octadecyltrichlorosilane (OTS). The NWs showed selective adsorption on the polar SiO2 regions, avoiding assembly on the nonpolar OTS regions. Utilizing these assembled Ni-Si NWs, we demonstrate a sensor for the detection of chlorine gas. The utilization of Ni-Si NWs resulted in a much larger sensor response of approximately 23% to 5 ppm of chlorine gas compared to bare Ni NWs, due to the increased surface-to-volume ratio of the Ni-Si shell/core structure. We expect that our sensor will be utilized in the future for the real-time detection of halogen gases including chlorine with high sensitivity and fast response.
authors: School of Mechanical Engineering, Korea University, 145 Anam-Ro, Seongbuk-Gu, Seoul 136-713 Korea.
authors: Dong-Jin
authors: DJ
authors: Lee
authors: Department of Bioengineering, University of California, 261 Donner Lab, Berkeley, CA 94720 USA.
authors: Kwang
authors: K
authors: Heo
authors: Department of Materials Science and Engineering, University of Wisconsin-Madison, 1509 University Avenue, Madison, WI 53706 USA.
authors: Hyungwoo
authors: H
authors: Lee
authors: School of Mechanical Engineering, Korea University, 145 Anam-Ro, Seongbuk-Gu, Seoul 136-713 Korea.
authors: Joon-Hyung
authors: JH
authors: Jin
authors: School of Mechanical Engineering, Korea University, 145 Anam-Ro, Seongbuk-Gu, Seoul 136-713 Korea.
authors: Hochan
authors: H
authors: Chang
authors: School of Mechanical Engineering, Korea University, 145 Anam-Ro, Seongbuk-Gu, Seoul 136-713 Korea.
authors: Minjun
authors: M
authors: Park
authors: Department of Materials Science and Engineering, Incheon National University, 119 Academy-ro, Yeonsu-gu, Incheon Korea.
authors: Han-Bo-Ram
authors: HB
authors: Lee
authors: School of Electrical and Electronic Engineering, Yonsei University, 50 Yonsei-Ro, Seodaemun-Gu, Seoul Korea.
authors: Hyungjun
authors: H
authors: Kim
authors: School of Mechanical Engineering, Korea University, 145 Anam-Ro, Seongbuk-Gu, Seoul 136-713 Korea.
authors: Byung Yang
authors: BY
authors: Lee
keywords: Atomic layer deposition; Halogen gas; Nanowires; Self-assembly; Sensor