Microwave-assisted synthesis of Fe-doped NiO nanofoams assembled by porous nanosheets for fast response and recovery gas sensors

Fe-doped NiO, a type of p-type gas sensor, has received wide attention for its low cost, environmentally friendliness and excellent gas-sensing performance. However, the operating temperature of Fe-doped NiO is too high (300 °C -500 °C). This study attempts to investigate the possibility of Fe-doped...

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Published inMaterials research express Vol. 4; no. 4; pp. 45015 - 45025
Main Authors Li, Xiu, Tan, Jian-Feng, Hu, Yan-E, Huang, Xin-Tang
Format Journal Article
LanguageEnglish
Published IOP Publishing 21.04.2017
Subjects
fast response and recovery
Fe-doped NiO
gas sensors
microwave-assisted synthesis
nanofoams
porous nanosheets
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Abstract Fe-doped NiO, a type of p-type gas sensor, has received wide attention for its low cost, environmentally friendliness and excellent gas-sensing performance. However, the operating temperature of Fe-doped NiO is too high (300 °C -500 °C). This study attempts to investigate the possibility of Fe-doped NiO working in relatively low temperature regions. A type of NiO nanofoam assembled by porous nanosheets was synthesized through a normal pressure microwave solvent thermal method by a domestic microwave oven, and Fe doping with different doping concentrations was investigated systematically. The gas-sensing performance was tested at a relatively low temperature (200 °C -280 °C). We found that the Fe-doped NiO still had a good gas-sensing performance, even at a relatively low temperature. In detail, the NiO nanofoams with 3 at% Fe-doping concentration were proven to have the best gas sensing characteristics (the response was 12-100 ppm ethanol at 280 °C), and an especially fast response and recovery (the response time and the recovery time was 1 s and 3.6 s, respectively). The study promoted the research regarding the gas sensing characteristics of Fe-doped NiO at a relatively low temperature.
AbstractList Fe-doped NiO, a type of p-type gas sensor, has received wide attention for its low cost, environmentally friendliness and excellent gas-sensing performance. However, the operating temperature of Fe-doped NiO is too high (300 °C -500 °C). This study attempts to investigate the possibility of Fe-doped NiO working in relatively low temperature regions. A type of NiO nanofoam assembled by porous nanosheets was synthesized through a normal pressure microwave solvent thermal method by a domestic microwave oven, and Fe doping with different doping concentrations was investigated systematically. The gas-sensing performance was tested at a relatively low temperature (200 °C -280 °C). We found that the Fe-doped NiO still had a good gas-sensing performance, even at a relatively low temperature. In detail, the NiO nanofoams with 3 at% Fe-doping concentration were proven to have the best gas sensing characteristics (the response was 12-100 ppm ethanol at 280 °C), and an especially fast response and recovery (the response time and the recovery time was 1 s and 3.6 s, respectively). The study promoted the research regarding the gas sensing characteristics of Fe-doped NiO at a relatively low temperature.
Author Li, Xiu
Tan, Jian-Feng
Hu, Yan-E
Huang, Xin-Tang
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SubjectTerms fast response and recovery
Fe-doped NiO
gas sensors
microwave-assisted synthesis
nanofoams
porous nanosheets
Title Microwave-assisted synthesis of Fe-doped NiO nanofoams assembled by porous nanosheets for fast response and recovery gas sensors
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