title: Electrochemical detection of ultratrace nitroaromatic explosives using ordered mesoporous carbon.
abstract: A sensitive electrochemical sensor has been fabricated to detect ultratrace nitroaromatic explosives using ordered mesoporous carbon (OMC). OMC was synthesized and characterized by scanning electron microscopy, transmission electron microscopy and nitrogen adsorption/desorption measurements. Glassy carbon electrodes functionalized with OMC show high sensitivity of 62.7 μA cm(-2) per ppb towards 2,4,6-trinitrotoluene (TNT). By comparison with other materials such as carbon nanotubes and ordered mesoporous silica, it is found that the high performance of OMC toward sensing TNT is attributed to its large specific surface area and fast electron transfer capability. As low as 0.2 ppb TNT, 1 ppb 2,4-dinitrotoluene and 1 ppb 1,3-dinitrobenzene can be detected on OMC based electrodes. This work renders new opportunities to detect ultratrace explosives for applications of environment protections and home securities against chemical warfare agents.
authors.affiliation: School of Chemical and Biomedical Engineering & Center for Advanced Bionanosystems, Nanyang Technological University, 70 Nanyang Drive, Singapore 637457, Singapore.
authors.forename: Jianfeng
authors.initials: J
authors.lastname: Zang
authors.forename: Chun Xian
authors.initials: CX
authors.lastname: Guo
authors.forename: Fengping
authors.initials: F
authors.lastname: Hu
authors.forename: Lei
authors.initials: L
authors.lastname: Yu
authors.forename: Chang Ming
authors.initials: CM
authors.lastname: Li
mesh_terms: D002244:Carbon / Q000737:chemistry*; D004136:Dinitrobenzenes / Q000032:analysis; D055664:Electrochemical Techniques / Q000379:methods*; D004566:Electrodes; D053834:Explosive Agents / Q000032:analysis*; D037742:Nanotubes, Carbon / Q000737:chemistry / Q000648:ultrastructure; D016062:Porosity; D012822:Silicon Dioxide / Q000737:chemistry; D014303:Trinitrotoluene / Q000032:analysis
chemical_list: D004136:Dinitrobenzenes; D053834:Explosive Agents; D037742:Nanotubes, Carbon; D014303:Trinitrotoluene; C016403:2,4-dinitrotoluene; D002244:Carbon; D012822:Silicon Dioxide; C017906:3-dinitrobenzene