Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7144464 | Sensors and Actuators B: Chemical | 2016 | 6 Pages |
Abstract
An effective fabrication of networked nanowire sensors with multiple junctions, which were obtained by selectively growing tungsten oxide nanowires directly on the arrays of discrete catalyst islands, was demonstrated for highly sensitive NO2 gas sensors. Junction density was controlled by altering growth time for superior NO2 gas response. The optimum sensor exhibited remarkably high response (Rg/Ra) to 10 ppm NO2 (Rg/Ra â¼Â 144.3), negligible cross-responses to 100 ppm CO, H2, and NH3 (Rg/Ra â¼Â 1.3-1.7), and ultralow detection limit (â¼0.33 ppb) at 250 °C. In addition, the sensor exhibited good reversibility for up to 15 cycles of air-to-gas switching under sensing at relatively high temperatures of up to 350 °C. The methodology illustrated in the present work aims to overcome the disadvantages of nanowire sensors grown on an ordinary continuous catalyst layer and to make these sensors suitable for large-scale fabrication via microelectronic technology.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Phung Thi Hong Van, Do Duc Dai, Nguyen Van Duy, Nguyen Duc Hoa, Nguyen Van Hieu,