title: Functionalized mesoporous silica for microgravimetric sensing of trace chemical vapors.
abstract: Featuring a huge surface-to-volume ratio, synthesized SBA-15 mesoporous silica is functionalized by inner-channel-wall modification of sensing groups for highly specific chemical-vapor detection at trace level. With the developed sensing material loaded on resonant microcantilevers, the specifically adsorbed chemical-vapor molecules act as an added mass to shift the cantilever resonant frequency for gravimetric sensing signal readout. Two kinds of sensing materials for trinitrotoluene (TNT) and ammonia/amine are respectively prepared by inner-wall layer-by-layer grafting functionalization. By using hexafluoro-2-propanol-functionalized mesoporous silica (HFMS), experimental results show highly specific and rapid detection of TNT vapor, with a ppt-level detection limit; functionalized with a carboxyl (COOH) group, the mesoporous silica is loaded onto the cantilever resonating sensor that experimentally exhibits an ultrafine detection limit of tens of ppb to ammonia/amine gases.
authors.affiliation: State Key Lab of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, People's Republic of China.
authors.forename: Pengcheng
authors.initials: P
authors.lastname: Xu
authors.forename: Haitao
authors.initials: H
authors.lastname: Yu
authors.forename: Xinxin
authors.initials: X
authors.lastname: Li
mesh_terms: D000588:Amines / Q000032:analysis / Q000737:chemistry; D000641:Ammonia / Q000032:analysis / Q000737:chemistry; D006112:Gravitation; D057230:Limit of Detection; D055616:Microtechnology / Q000379:methods*; D016062:Porosity; D020005:Propanols / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry*; D018511:Systems Integration; D014303:Trinitrotoluene / Q000032:analysis / Q000737:chemistry; D014835:Volatilization; D006845:Hydrocarbons, Fluorinated
chemical_list: D000588:Amines; D000641:Ammonia; D020005:Propanols; D012822:Silicon Dioxide; D014303:Trinitrotoluene; C509969:SBA-15; C001337:hexafluoroisopropanol; D006845:Hydrocarbons, Fluorinated