کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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539683 | 871266 | 2011 | 8 صفحه PDF | دانلود رایگان |

The high conductivity of colloid-conducting polymers is explained by the networking structures and the hopping mechanisms of the metallic particles [1], [2] and [4]. To observe how the metallic region and the networking structures differ in sensing NH3 gas, E-beam lithography and electromigration were used to make chemoresistors with nanometer-gap electrodes. Colloid Pani was coated on a nanometer gap as a reaction matrix for the gas. The I–V curves were measured in a vacuum and the NH3 gas was nonlinear. In sensors with a gap of less than 10 nm, there was a two- or threefold increase in the conductivity, and the work function decreased from 600 meV in a vacuum to 250 meV in NH3 gas. In contrast, the conductivity of sensors with gaps of 200 and 500 nm decreased to 1/1000 in the NH3 gas environment. The decrease of the conductivity can be explained by electron–hole annihilation, which appears to occur on the surface of the secondary particles. With comb-type electrodes, the operating voltage can be decreased by three orders of magnitude. In electrodes with 200 and 500 nm gaps, the I–V has a step-type response to NH3 gas.
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Journal: Microelectronic Engineering - Volume 88, Issue 9, September 2011, Pages 3035–3042