Byoung-Kye Kim et al 2005 Nanotechnology 16 1177 doi:10.1088/0957-4484/16/8/033
Byoung-Kye Kim1,2, Yong Hwan Kim2, Keehoon Won2, Hyunju Chang2, Youngmin Choi2, Ki-jeong Kong2, Beoyong Whan Rhyu2, Ju-Jin Kim1 and Jeong-O Lee2,3
Show affiliationsPolyaniline (PANI) nanofibres were synthesized using a biocatalyst (recombinant Coprinus cinereus peroxidase) instead of toxic chemical oxidants. Relatively uniform nanofibres with 50–100 nm diameter were easily obtained with this method, and the doping state of the PANI nanofibre could be controlled either with 1N camphorsulfonic acid (CSA) or with 30% NH4OH. Doped (or dedoped) PANI nanofibres were deposited on pre-patterned Au electrodes for electrical characterization. Completely dedoped PANI behaves as an insulator, while a larger current, by more than four orders of magnitude, was observed from doped PANI nanofibres. A weak p-type gate effect was observed for PANI nanofibre devices as well. As one could expect from the easy doping nature of PANI, PANI nanofibre devices show high sensitivity toward dedoping (NH3) gases, thereby demonstrating the possibility of using enzyme-synthesized PANI nanofibre devices as sensitive chemical sensors.
73.63.-b Electronic transport in nanoscale materials and structures
07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
82.65.+r Surface and interface chemistry; heterogeneous catalysis at surfaces
Instrumentation and measurement
Surfaces, interfaces and thin films
Issue 8 (August 2005)
Received 5 November 2004, in final form 22 March 2005
Published 20 May 2005
Byoung-Kye Kim et al 2005 Nanotechnology 16 1177
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