title: Highly sensitive room temperature carbon monoxide detection using SnO2 nanoparticle-decorated semiconducting single-walled carbon nanotubes.
abstract: We demonstrate a practical sensing platform, consisting of SnO(2) nanoparticle-decorated semiconducting single-walled carbon nanotubes assembled on gold electrodes via a dielectrophoretic process, for highly sensitive CO detection with fast response at room temperature. The highest sensitivity obtained was 0.27 and the response time was ∼2 s for 100 ppm CO detection. The lower detection limit was ∼1 ppm. These results indicate that the sensing performance of our device is among the best of CO sensors implemented with SWNTs. Further, we observed a significant increase in sensitivity to 0.67 after subjecting the device to an electrical breakdown at 8 V. We also proposed a theoretical model to reveal the relationship between the sensitivity and the gas concentration. The new model not only resulted in a nice fit to our data, but also allowed us to estimate the contact resistance between an individual SWNT and the gold electrodes.
authors.affiliation: Department of Mechanical Engineering, University of Wisconsin, Milwaukee, 3200 North Cramer Street, Milwaukee, WI 53211, USA.
authors.forename: Yang
authors.initials: Y
authors.lastname: Zhang
authors.forename: Shumao
authors.initials: S
authors.lastname: Cui
authors.forename: Jingbo
authors.initials: J
authors.lastname: Chang
authors.forename: Leonidas E
authors.initials: LE
authors.lastname: Ocola
authors.forename: Junhong
authors.initials: J
authors.lastname: Chen
mesh_terms: D002245:Carbon Dioxide / Q000032:analysis* / Q000737:chemistry; D003198:Computer Simulation; D017076:Computer-Aided Design; D003217:Conductometry / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008839:Microelectrodes; D008956:Models, Chemical; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure; D012666:Semiconductors; D013440:Sulfides / Q000737:chemistry*; D013696:Temperature; D017971:Tin Compounds / Q000737:chemistry*
chemical_list: D037742:Nanotubes, Carbon; D013440:Sulfides; D017971:Tin Compounds; C078041:tin sulfide; D002245:Carbon Dioxide