Nanomaterials
·
2022
·Vol. 12
·期 19
·3512
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IF 5.719
Zhaofeng Wu,Yidan Xia,Lixiang Liu,Qihua Sun,Jun Sun,Furu Zhong,Min Zhang,Haiming Duan
Waste human hair was carbonized into carbon sheets by a simple carbonization method, which was studied as gas sensing materials for the first time. The effect of carbonization temperature on the structure and gas sensing properties of hair-based carbon sheet was studied by scanning electron microscope, X-ray diffraction, infrared spectrum, Raman spectrum, and gas-sensitive tester. The results showed that the carbonization temperature had a significant effect on the structure and gas sensing performance of carbon sheets, which were doped with K, N, P, and S elements during carbonization. However, the sensor of the carbon sheet does not show good selectivity among six target gases. Fortunately, the carbon sheets prepared at different temperatures have different responses to the target gases. The sensor array constructed by the carbon sheets prepared at different temperatures can realize the discriminative detection of a variety of target gases. For the optimized carbon sheet, the theoretical limit of detection of hydrogen peroxide is 0.83 ppm. This work provides a reference for the resource utilization of waste protein and the development of gas sensors.Keywords:human hair;biomass carbon material;gas-sensitive properties;carbon sheets
研究领域:
材料科学
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环境科学
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传感技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Min Ma,Li Chen,Lin Peng,Ying Peng,Jian Bi,Daojiang Gao,Jiangtao Wu
Even if the application of semiconducting metal oxide-based gas sensors has flourished over decades, the basic understanding of how sensing characteristics are regulated remains elusive. In particular, the role of oxygen vacancy in sensing properties of p-type semiconductors has not been well investigated thus far. In this work, pristine and aliovalent ion-doped p-type multiferroic BiFeO 3 sensors were prepared by a sol-gel method, and the effect of doping on the carrier type, oxygen vacancy concentration, and gas sensing properties was studied. The gas response of BiFeO 3 increased 48 % upon 1 % Ca doping and decreased 50 % when 1 % Ti was doped in. This is because Ca-doped BiFeO 3 increases the concentration of carriers (hole) and oxygen vacancies, while Ti-doped BiFeO 3 does the opposite. In addition, the conduction characteristics of BiFeO 3 were transformed from p-type to n-type upon further substitution of Fe 3+ by Ti 4+ . This work proves that aliovalent ion doping can regulate the concentration and type of carriers in materials, as well as the control of gas sensing properties, thus shedding a light on the design of high-performance p-type semiconductors.
研究领域:
材料科学
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传感器技术
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2015
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IF 2.752
Chang Su,Yongcun Zou,Xiaofeng Xu,Li Liu,Zhen Liu,Lili Liu
Pure and Nd-doped porous α-Fe 2 O 3 nanotubes were successfully synthesized via a facile single-capillary electrospinning method, followed by calcination treatment. The morphologies of the as-prepared samples were characterized by scanning electron microscopy. The crystal structures and components were determined by X-ray diffraction and energy-dispersive X-ray spectroscopy, respectively. The gas-sensing properties of the as-prepared samples were studied, and the results indicate the ultrahigh sensitivity of Nd-doped porous α-Fe 2 O 3 nanotubes to acetone. The response of Nd-doped porous α-Fe 2 O 3 nanotubes to 50 ppm of acetone is about 44 at an operating temperature of 240 °C, which is 17 times larger than that of pure porous α-Fe 2 O 3 nanotubes. Furthermore, the lowest detection limit of acetone is 500 ppb, with a response of 2.4. The response and recovery times to 50 ppm of acetone are about 19 and 50 s, respectively. In addition, the Nd-doped porous α-Fe 2 O 3 nanotubes possess good selectivity and long-term stability.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Shuang Cao,Ning Sui,Peng Zhang,Tingting Zhou,Jinchun Tu,Tong Zhang
Gas sensors have become increasingly significant because of the rapid development in electronic devices that are applied in detecting noxious gases. Adjusting the crystal phase structure of sensing materials can optimize the band gap and oxygen-adsorptive capacity, which influences the gas sensing characteristics. Therefore, titanium dioxide (TiO 2 ) materials with different crystal phase structures including rutile TiO 2 nanorods (R-TiO 2 NRs), anatase TiO 2 nanoparticles (A-TiO 2 NRs) and brookite TiO 2 nanorods (B-TiO 2 NRs) were synthesized successfully via one-step hydrothermal process, respectively. The gas sensing characteristics were also investigated systematically. The sensors based on R-TiO 2 NRs displayed the higher response value (12.3) to 100 ppm acetone vapor at 320 °C compared to A-TiO 2 NRs (4.1) and B-TiO 2 NRs (2.3). Furthermore, gas sensors based on R-TiO 2 NRs exhibited excellent repeatability under six cycles and good selectivity to acetone. The outstanding sensing properties of gas sensors based on R-TiO 2 NRs can be ascribed to relatively narrow band gap and more oxygen vacancies of rutile phase, which showed a probable way for design gas sensors based on metal oxide semiconductors with remarkable gas sensing performances by the crystal phase adjustment engineering in the future.
研究领域:
材料科学
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传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 6
·2402-2407
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IF 3.288
Shouli Bai,Jingyi Han,Xiangxiang Fan,Jian Guo,Ruixian Luo,Dianqing Li,Aifan Chen
One-dimensional α-MoO3 nanorods were synthesized by a hydrothermal method and BiVO4 nanoparticles were grown directly onto the α-MoO3 nanorods using a simple metal organic decomposition process in order to construct an α-MoO3/BiVO4 composite with a heterojunction, for the fabrication of a rapid response triethylamine (TEA) sensor. The morphology and structure of the composite were characterized via various spectral techniques and the sensing properties of the sensor for TEA were investigated via resistance measurements. The results showed that the response of the 16Mo/Bi composite to 20 ppm TEA was 1.86 times and 15 times higher than those of α-MoO3 and BiVO4, respectively, at an optimum operating temperature of 125 °C. The enhancement can be ascribed to the existence of a heterojunction between α-MoO3 and BiVO4, creating an additional barrier at the interface of the heterojunction, and this increases the resistance of the composite in air and decreases the resistance in TEA, thus enhancing the response of the composite to TEA.
研究领域:
材料科学
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化学传感器
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纳米材料
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2024
·
IF 4.1
Zhihua Zhao,Zhikun Wang,Chunhua Zheng,Guixin Jin,Xiaoqing Shen,Lan Wu
Nitrogen dioxide is a toxic gas to the human body, which is the cause of acid rain and respiratory diseases. In this study, VTe 2 was first created for use in gas sensors by hydrothermal synthesis. After examining the gas-sensitive characteristics, it was found that the VTe 2 gas sensor responds 105 % to 50 ppm nitrogen dioxide (NO 2 ) gas at 140°C and 40 % relative humidity (RH), with a relative humidity setting temperature of 25°C. Furthermore, the sensor has fast response recovery time, good selectivity, repeatability, stability and moisture resistance. Finally, a sensing mechanism for NO 2 detection was suggested.
研究领域:
材料科学
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环境科学
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传感技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Yi Liu,Jing Huang,Yongfeng Gong,Xiaomin Xu,Hua Li
WO 3 is one of the inspiring sensing materials that show high response to O 3 ; an efficient fabrication of WO 3 film with incorporation of complementary additives is essential for enhanced sensitivity. Here we report film deposition by liquid flame spraying, characterization of nanostructured WO 3 -reduced graphene oxide (rGO) composites and their gas-sensing activities to O 3 . The starting feedstock was prepared from WC l6 and rGO for pyrolysis synthesis by flame spraying. Nano-porous WO 3 -rGO films were successfully fabricated and characterized by transmission electron microscopy , field emission scanning electron microscopy , Raman spectrometry , thermal analyses and X-ray diffraction. Nanosized WO 3 grains exhibited oriented nucleation on rGO flakes whereas rGO retained intact its nano-structural features after spraying. Constrained grain growth of WO 3 of 60–70 nm in size was realized in the rGO-containing films with as compared to ~220 nm in the pure WO 3 film. The WO 3 -rGO film sensors showed quicker response to O 3 and faster recovery than rGO-free WO 3 film sensors. Addition of rGO in 1.0 wt% or 3.0 wt% in the films caused a significantly reduced effective working temperature of the film sensors from ~ 250 °C to ~ 150 °C.
研究领域:
材料科学
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传感器技术
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）