title: Detection of a nerve agent simulant using single-walled carbon nanotube networks: dimethyl-methyl-phosphonate.
abstract: Single-walled carbon nanotube (SWNT) networks were used to detect hazardous dimethyl-methyl-phosphonate (DMMP) gas in real time, employing two different metals as electrodes. Random networks of SWNTs were simply obtained by drop-casting a SWNT-containing solution onto a surface-oxidized Si substrate. Although the electrical responses to DMMP at room temperature were reversible for both metals, the Pd-contacting SWNT network sensors exhibited a higher response and a shorter response time than those of the Au-contacting SWNT network sensors at the same DMMP concentration, due to the stronger interactions between the SWNTs and Pd surface atoms. In Pd-contacting SWNT network sensors, the response increased linearly with increasing DMMP concentration and reproducible response curves were obtained for DMMP levels as low as 1 ppm. These results indicate that SWNT networks in contact with Pd electrodes can function as good DMMP sensors at room temperature with scalable and fast response and excellent recovery.
authors.affiliation: Department of Materials Science and Engineering, Yonsei University, Seoul, Korea.
authors.forename: Yeonju
authors.initials: Y
authors.lastname: Kim
authors.forename: Seunghyun
authors.initials: S
authors.lastname: Lee
authors.forename: Hyang Hee
authors.initials: HH
authors.lastname: Choi
authors.forename: Jin-Seo
authors.initials: JS
authors.lastname: Noh
authors.forename: Wooyoung
authors.initials: W
authors.lastname: Lee
mesh_terms: D002619:Chemical Warfare Agents / Q000032:analysis*; D017097:Electric Impedance; D004566:Electrodes; D006046:Gold / Q000737:chemistry; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure; D063065:Organophosphonates / Q000032:analysis*; D010084:Oxidation-Reduction; D010165:Palladium / Q000737:chemistry; D017905:Phosphites / Q000032:analysis*; D013059:Spectrum Analysis, Raman; D013997:Time Factors
chemical_list: D002619:Chemical Warfare Agents; D037742:Nanotubes, Carbon; D063065:Organophosphonates; D017905:Phosphites; D010165:Palladium; D006046:Gold; C047356:dimethyl hydrogen phosphite