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Scalable arrays of chemical vapor sensors based on DNA-decorated graphene

Nano Research 2014年第1期7卷 95-103页

作者： Nicholas J. Kybert Gang Hee Han Mitchell B. Lerner Eric N. Dattoli Ali Esfandiar A. T. Charlie Johnson Department of Physics and Astronomy University of Pennsylvania Philadelphia PA 19104 USA SPAWAR Systems Center Pacific San Diego CA 92152 USA

Arrays of chemical vapor sensors based on graphene field effect transistors functionalized with single-stranded DNA have been demonstrated. Standard photolithographic processing was adapted for use on large-area graphene by including a metal protection layer, which protected the graphene from contamination and enabled fabrication of high quality field-effect transistors （GFETs）. Processed graphene devices had hole mobilities of 1,640 ± 250 cm2.V-1.s-1 and Dirac voltages of 15 ± 10 V under ambient conditions. Atomic force microscopy was used to verify that the graphene surface remained uncontaminated and therefore suitable for controlled chemical functionalization. Single-stranded DNA was chosen as the functionalization layer due to its affinity to a wide range of target molecules and π-π stacking interaction with graphene, which led to minimal degradation of device characteristics. The resulting sensor arrays showed analyte- and DNA sequence-dependent responses down to parts-per-billion concentrations. DNA/GFET sensors were able to differentiate among chemically similar analytes, including a series of carboxylic acids, and structural isomers of carboxylic acids and pinene. Evidence for the important role of electrostatic chemical gating was provided by the observation of understandable differences in the sensor response to two compounds that differed only by the replacement of a （deprotonating） hydroxyl group by a neutral methyl group. Finally, target analytes were detected without loss of sensitivity in a large background of a chemically similar, volatile compound. These results motivate further development of the DNA/graphene sensor family for use in an electronic olfaction system.

关键词： graphene vapor sensor DNA photolithography chemical gating

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Thin Film Assembly of Gold Nanoparticles for vapor Sensing via Droplet Interfacial Reaction

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Journal of Materials Science & Technology 2013年第5期29卷 401-405页

作者： Kun Luo Tao Huang Yujia Luo Haiming Wang Chao Sang Xiaogang Li Key Laboratory of New Processing Technology for Nonferrous Metals & Materials Ministry of EducationCollege of Materials Science and EngineeringGuilin University of Technology China Medical University Shenbei New District

A facile approach to prepare a thin film vapor sensor is demonstrated through droplet interracial reaction on an IDA microelectrode. Scanning electron microscopy, atomic force microscopy and transmission electron microscopy analyses show that the film of the vapor sensor is composed of self-assembled gold nanocrystals in an average diameter of about 4.3 nm. The as-prepared sensor was examined by potential step method and impedance measurement, which exhibited significant △R/Ri responses and excellent cycle performance to the volatile organic compound （VOC） vapors of acetone, methanol, styrene, benzene, toluene and ethanol. The selectivity to the VOCs with benzene ring or organic solvents suggests that the sensor is probably in line with the swelling and dielectric sensing mechanisms.

关键词： Gold nanoparticle Thin film Self-assembly Droplet interfacial reaction vapor sensor

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