Dielectrophoretically assembled polymer nanowires for gas sensing

被引:59
作者
Dan, Yaping [1 ]
Cao, Yanyan
Mallouk, Tom E.
Johnson, Alan T.
Evoy, Stephane
机构
[1] Univ Penn, Dept Elect & Syst Engn, Philadelphia, PA 19104 USA
[2] Penn State Univ, Dept Chem, University Pk, PA 16802 USA
[3] Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA
[4] Univ Alberta, Dept Elect & Comp Engn, Edmonton, AB T6G 2V4, Canada
[5] Univ Alberta, Natl Inst Nanotechnol, Edmonton, AB T6G 2V4, Canada
基金
美国国家科学基金会;
关键词
polymer; nanowire; vapor sensor; dielectrophoretic assembly;
D O I
10.1016/j.snb.2007.01.042
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
We measured the electronic properties and gas sensing response of nanowires containing segments of poly(3,4-ethylenedioxythiophene)/ poly(styrenesulfonate) (PEDOT/PSS) that were synthesized using anodic aluminum oxide (AAO) membranes. The nanowires have a "striped" structure of gold-PEDOT/PSS-gold and are typically 8 mu m long (1 mu m-6 mu m-1 mu m for each section, respectively) and 220 nm in diameter. Dielectrophoretic assembly was used to position single nanowires on pre-fabricated gold electrodes. A polymer conductivity of 11.5 +/- 0.7 S/cm and a contact resistance of 27.6 +/- 4 k ohm were inferred from resistance measurements of nanowires of varying length and diameter. When used as gas sensors, the wires showed a resistance change of 10.5 %, 9 %, and 4 % at the saturation vapor pressure of acetone, methanol and ethanol, respectively. Sensor response and recovery were rapid (seconds) with excellent reproducibility in time and across devices. "Striped" template-grown nanowires are thus intriguing candidates for use in electronic nose vapor sensing systems. (c) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:55 / 59
页数:5
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