Synthesis and Improved Acetone Sensing Properties of Porous α-Fe₂O₃ Nanowires

【摘要】 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℃.The corresponding sensor response（R_a/R_g） is 18.2 at the maximum to 100ppm 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.更多还原

【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℃.The corresponding sensor response（R_a/R_g） is 18.2 at the maximum to 100ppm 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.更多还原