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WO3 nanomaterials synthesized via a sol-gel method and calcination for use as a CO gas sensor 被引量:1
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作者 Diah SUSANTI A.A. Gede Pradnyana DIPUTRA +5 位作者 Lucky TANANTA Hariyati PURWANINGSIH George Endri KUSUMA Chenhao WANG Shaoju SHIH Yingsheng HUANG 《Frontiers of Chemical Science and Engineering》 SCIE EI CAS CSCD 2014年第2期179-187,共9页
Carbon monoxide is a poisonous and hazardous gas and sensitive sensor devices are needed to prevent humans from being poisoned by this gas. A CO gas sensor has been prepared from WO3 synthesized by a sol-gel method. T... Carbon monoxide is a poisonous and hazardous gas and sensitive sensor devices are needed to prevent humans from being poisoned by this gas. A CO gas sensor has been prepared from WO3 synthesized by a sol-gel method. The sensor chip was prepared by a spin-coating technique which deposited a thin film of WO3 on an alumina substrate. The chip samples were then calcined at 300, 400, 500 or 600 ℃ for 1 h. The sensitivities of the different sensor chips for CO gas were determined by comparing the changes in electrical resistance in the absence and presence of 50 ppm of CO gas at 200 ℃. The WO3 calcined at 500 ℃ had the highest sensitivity. The sensitivity of this sensor was also measured at CO concentrations of 100 ppm and 200 ppm and at operating temperatures of 30 and 100℃. Thermogravimetric analysis of the WO3 calcined at 500 ℃ indicated that this sample had the highest gas adsorption capacity. This preliminary research has shown that WO3 can serve as a CO gas sensor and that is should be further explored and developed. 展开更多
关键词 wo3 nanomaterial sol-gel CALCINATIONS COgas sensor sensitivity
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Highly sensitive acetone gas sensor based on ultra-low content bimetallic PtCu modified WO3·H2O hollow sphere
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作者 Lifeng Deng Liping Bao +2 位作者 jingcheng Xu DingWang Xianying Wang 《Chinese Chemical Letters》 SCIE CAS CSCD 2020年第8期2041-2044,共4页
Acetone is an important industrial raw material as well as biomarker in medical diagnosis.The detection of acetone has great significance for safety and health.However,high selectivity and low concentration(ppb level)... Acetone is an important industrial raw material as well as biomarker in medical diagnosis.The detection of acetone has great significance for safety and health.However,high selectivity and low concentration(ppb level)detection remain challenges for semiconductor gas sensor.Herein,we present a novel sensitive material with bimetallic PtCu nanocrystal modified on WO3·H2O hollow spheres(HS),which shows high sensitivity,excellent selectivity,fast response/recovery speed and low limit of detection(LOD)to acetone detection.Noteworthy,the response(Ra/Rg)of WO3·H2O HS sensor increased by 9.5 times after modification with 0.02%bimetallic PtCu nanocrystals.The response of PtCu/WO3·H2O HS to 50 ppm acetone is as high as 204.9 with short response/recovery times(3.4 s/7.5 s).Finally,the gassensitivity mechanism was discussed based on gas sensitivity test results.This research will offer a new route for high efficient acetone detection. 展开更多
关键词 Bimetallic nanocrystal wo3·H2O hollow spheres Two-dimensional materials Acetone gas sensors NANOCOMPOSITES
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A WO3 nanorod-Cr2O3 nanoparticle composite for selective gas sensing of 2-butanone 被引量:2
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作者 Qian Zhang He Zhang +2 位作者 Mingkun Xu Zhurui Shen Qiang Wei 《Chinese Chemical Letters》 SCIE CAS CSCD 2018年第3期538-542,共5页
The hexagonal (h)-WO3-Cr2o3 nanocomposites with different W/Cr molar ratio of 4:1,10:1 and 40:1 were prepared by a facile two-step hydrothermal method, and its gas sensing properties were investigated under optim... The hexagonal (h)-WO3-Cr2o3 nanocomposites with different W/Cr molar ratio of 4:1,10:1 and 40:1 were prepared by a facile two-step hydrothermal method, and its gas sensing properties were investigated under optimum working temperature. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM) were used to characterize the morphology, microstructure and crystallinity of the as-synthesized samples. The hexagonal WO3 nanorods show a better crystallinity than Cr2O3 nanoparticles. When the molar ratio of W/Cr is 10:1, the hexagonal WO3-Cr2O3 nanocomposite shows obvious selectivity toward 2-butanone at 205℃ compared with other typical reducing gases, and the response value to 100 ppm 2- butanone can reach 5.6. However, there is no selectivity toward 2-butanone when the Cr/W molar ratio is 1:4 and 1:40. Furthermore, hexagonal WO3-Cr2O3 nanocomposites have a short response and recovery time to 5ppm 2-butanone, which is lOs and 80s, respectively. The measured results indicate that hexagonal WO3-Cr2O3 nanocomposite is a potential gas sensing material for monitoring volatile organic compounds (VOCs). 展开更多
关键词 Nanocomposite wo3-Cr2O gas sensor Selectivity 2-Butanone
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Flexible fabric gas sensors based on PANI/WO3 p−n heterojunction for high performance NH3 detection at room temperature 被引量:2
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作者 Meng He Lili Xie +3 位作者 Guifang Luo Zhanhong Li James Wright Zhigang Zhu 《Science China Materials》 SCIE EI CSCD 2020年第10期2028-2039,共12页
A PANI/WO3@cotton thread-based flexible sensor that is capable of detecting NH3 at room temperature is developed here.A layer of WO3 with PANI nanoparticles can be deposited by in-situ polymerization.The morphology an... A PANI/WO3@cotton thread-based flexible sensor that is capable of detecting NH3 at room temperature is developed here.A layer of WO3 with PANI nanoparticles can be deposited by in-situ polymerization.The morphology and structure of the specimens were investigated by utilizing TEM,SEM,XRD and FTIR.The sensing performance of the PANI/WO3@cotton sensors with different WO3 molar ratios to NH3 at room temperature was examined.The results show that the optimal sensor(10 mol%WO3)has a response of 6.0 to 100 ppm NH3,which is significantly higher than that of the sensors based on pristine PANI and other composites.The PANI/WO3@cotton sensor also displays excellent selectivity,gas response,and flexibility even at room temperature.The unique fiber structure,p-n heterojunction,and the increased protonation of PANI in the composites contribute to the enhanced sensing property. 展开更多
关键词 gas sensor PANI/wo3 cotton thread p-n heterojunction NH3 detection
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