title: Ultrasensitive chemical detection using a nanocoax sensor.
abstract: We report on the design, fabrication, and performance of a nanoporous, coaxial array capacitive detector for highly sensitive chemical detection. Composed of an array of vertically aligned nanoscale coaxial electrodes constructed with porous dielectric coax annuli around carbon nanotube cores, this sensor is shown to achieve parts per billion level detection sensitivity, at room temperature, to a broad class of organic molecules. The nanoscale, 3D architecture and microscale array pitch of the sensor enable rapid access of target molecules and chip-based multiplexing capabilities, respectively.
authors.affiliation: Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, United States.
authors.forename: Huaizhou
authors.initials: H
authors.lastname: Zhao
authors.forename: Binod
authors.initials: B
authors.lastname: Rizal
authors.forename: Gregory
authors.initials: G
authors.lastname: McMahon
authors.forename: Hengzhi
authors.initials: H
authors.lastname: Wang
authors.forename: Pashupati
authors.initials: P
authors.lastname: Dhakal
authors.forename: Timothy
authors.initials: T
authors.lastname: Kirkpatrick
authors.forename: Zhifeng
authors.initials: Z
authors.lastname: Ren
authors.forename: Thomas C
authors.initials: TC
authors.lastname: Chiles
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Naughton
authors.forename: Dong
authors.initials: D
authors.lastname: Cai
mesh_terms: D002623:Chemistry Techniques, Analytical / Q000295:instrumentation*; D025802:Electric Capacitance; D004566:Electrodes; D000431:Ethanol / Q000032:analysis; D036103:Nanotechnology / Q000295:instrumentation*; D013696:Temperature; D013997:Time Factors; D055549:Volatile Organic Compounds / Q000032:analysis
chemical_list: D055549:Volatile Organic Compounds; D000431:Ethanol