Real-time detection of chlorine gas using Ni/Si shell/core nanowires Nanoscale Research Letters
Dong-jin Lee ,Kwang Heo ,Hyungwoo Lee ,Joon-Hyung Jin ,Hochan Chang Minjun Park ,Han-Bo-Ram Lee ,Hyungjun Kim & Byung Yang Lee
http://www.nanoscalereslett.com/content/10/1/18/abstract
doi:10.1186/s11671-015-0729-2
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 moleculary patterned substrates and their application to sensors for the detection of chlorine gas, a toxic halogen gas. The molecularly patterend 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.
