TY - JOUR
T1 - Ultraselective Toluene-Gas Sensor
T2 - Nanosized Gold Loaded on Zinc Oxide Nanoparticles
AU - Suematsu, Koichi
AU - Watanabe, Kosuke
AU - Tou, Akihiro
AU - Sun, Yongjiao
AU - Shimanoe, Kengo
N1 - Funding Information:
This work was partially supported by the Japan Society for the Promotion of Science (JSPS) Grants-in-Aid for Scientific Research (KAKENHI), grant numbers JP17K17941 and JP16K18248. K.W. was partially supported by the Cooperative Research Program of the Network Joint Research Center for Materials and Devices. The authors also thank to both Dr. Michitaka Ohtaki and Dr. Koichiro Suekuni, Kyushu University, for the synthesis of the Au-loaded ZnO NPs and the XRD measurements. We would like to thank Dr. Masato Uehara, National Institute of Advanced Industrial Science and Technology (AIST), for his help with the FE-SEM(S-5200) observations. We thank Natasha Lundin, PhD, from Edanz Group (www.edanzediting.com/ac) for editing a draft of this manuscript.
Publisher Copyright:
© 2018 American Chemical Society.
PY - 2018/2/6
Y1 - 2018/2/6
N2 - Selectivity is an important parameter of resistive-type gas sensors that use metal oxides. In this study, a highly selective toluene sensor is prepared using highly dispersed gold-nanoparticle-loaded zinc oxide nanoparticles (Au-ZnO NPs). Au-ZnO NPs are synthesized by coprecipitation and calcination at 400 °C with Au loadings of 0.15, 0.5, and 1.5 mol %. The Au NPs on ZnO are about 2-4 nm in size, and exist in a metallic state. Porous gas-sensing layers are fabricated by screen printing. The responses of the sensor to 200 ppm hydrogen, 200 ppm carbon monoxide, 100 ppm ethanol, 100 ppm acetaldehyde, 100 ppm acetone, and 100 ppm toluene are evaluated at 377 °C in a dry atmosphere. The sensor response of 0.15 mol % Au-ZnO NPs to toluene is about 92, whereas its sensor responses to other combustible gases are less than 7. Such selective toluene detection is probably caused by the utilization efficiency of the gas-sensing layer. Gas diffusivity into the sensing layer of Au-ZnO NPs is lowered by the catalytic oxidation of combustible gases during their diffusion through the layer. The present approach is an effective way to improve the selectivity of resistive-type gas sensors.
AB - Selectivity is an important parameter of resistive-type gas sensors that use metal oxides. In this study, a highly selective toluene sensor is prepared using highly dispersed gold-nanoparticle-loaded zinc oxide nanoparticles (Au-ZnO NPs). Au-ZnO NPs are synthesized by coprecipitation and calcination at 400 °C with Au loadings of 0.15, 0.5, and 1.5 mol %. The Au NPs on ZnO are about 2-4 nm in size, and exist in a metallic state. Porous gas-sensing layers are fabricated by screen printing. The responses of the sensor to 200 ppm hydrogen, 200 ppm carbon monoxide, 100 ppm ethanol, 100 ppm acetaldehyde, 100 ppm acetone, and 100 ppm toluene are evaluated at 377 °C in a dry atmosphere. The sensor response of 0.15 mol % Au-ZnO NPs to toluene is about 92, whereas its sensor responses to other combustible gases are less than 7. Such selective toluene detection is probably caused by the utilization efficiency of the gas-sensing layer. Gas diffusivity into the sensing layer of Au-ZnO NPs is lowered by the catalytic oxidation of combustible gases during their diffusion through the layer. The present approach is an effective way to improve the selectivity of resistive-type gas sensors.
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U2 - 10.1021/acs.analchem.7b04048
DO - 10.1021/acs.analchem.7b04048
M3 - Article
C2 - 29298477
AN - SCOPUS:85041391651
VL - 90
SP - 1959
EP - 1966
JO - Analytical Chemistry
JF - Analytical Chemistry
SN - 0003-2700
IS - 3
ER -