Synthesis and Improved Acetone Sensing Properties of Porous α-Fe2O3 Nanowires
LIU Li1**, CHI Xiao1, WANG Guo-Guang1, LIU Chang-Bai2, SHAN Hao1, ZHANG Xiao-Bo1, WANG Lian-Yuan1, GUAN Hong-Yu3
1State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012 2College of Electronic Science and Engineering, Jilin University, Changchun 130012 3College of Chemistry, Northeast Normal University, Changchun 130026
Abstract：Porous α-Fe2O3 nanowires are synthesized by a simple wet chemical method with a precursor of peroxyacetyl nitrate (PAN), and α-Fe2O3 nanoparticles are also synthesized in the same way except for the addition of PAN. Gas sensors are fabricated by coating the samples on ceramic tubes with Au signal electrodes and Ni-Cr heaters. A sensing investigation reveals that the porous α-Fe2O3 nanowires have a higher sensitivity compared to α-Fe2O3 nanoparticles at 260°C. The corresponding sensor response (Ra/Rg) is 18.2 at the maximum to 100 ppm acetone, and the response and recovery times are about 8 and 12 s, respectively. The porous and one-dimensional nanostructures of the porous α-Fe2O3 nanowires benefit for the gas-absorption and electrical-signal-transfer, and thus improve the sensor sensitivity consequentially.
2013, Vol. 30 
