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.
Bibliographical noteFunding Information:
This project was supported by the Basic Science Research Program through the National Research Foundation (NRF; grant number 2013R1A1A1010802) and in part by Korea Ministry of Environment as ‘The Environmental Health Action Program’ (grant number: ARQ201303173002) and as ‘The Converging Technology Program’ (grant numbers: 2013001650001, ARQ201403075001).
© 2015, Lee et al.; licensee Springer.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics