CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Long Chen,Yanhua Song,Qiwen Yu,Hao Dong,Chenying Pan,Di Wang,Jun Liu,Xing Chen
Gas sensing requires precise gas detection, hence the need for the development of semiconductors with highly selective and sensitive properties. Herein, different amounts of Tb-doped Fe 2 O 3 nanotubes (NTs) are successfully fabricated for detecting acetone gas using electrospinning followed by calcination at 550 °C. Specifically, the gas sensing investigation indicated that 5% Tb–Fe 2 O 3 NTs to 50 ppm acetone reached 53.2 at 170 °C, which is 13 times higher than that of pure Fe 2 O 3 NTs. In addition, the sensor also displays good selectivity and a low detection limit (200 ppb) for acetone. The significant increase in acetone sensing performance could be ascribed to hollow structures with a high specific surface area and the increase in oxygen vacancies by Tb doping. The proposed Tb-doped Fe 2 O 3 NTs offer an effective strategy for fabricating a highly sensitive acetone sensor, which can work well at a relatively low temperature.
研究领域:
材料科学
·
纳米技术
·
传感器与执行器
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Chenxing Wang,Yinghao Xie,Yong Liu,Jing Wang,Shixiang Sun,Xiaoteng Jia,Qingrun Li,Liang Zhu,Fangmeng Liu,Geyu Lu
MXenes are characterized by high specific surface area and narrow band gap, while in-plan order MXene (i-MXene) provides enhanced ordered active sites through a vacancy structure, making it a promising 2D material for room temperature gas sensors. However, MXene-based gas sensors face challenges such as low response value, high limit of detection (LOD), poor recoverability, and long response/recovery time. Herein, we fabricated a room temperature gas sensor using g-C 3 N 4 /Mo 1.33 CT x sensing material and explored its sensing performance under visible light excitation. The visible light excitation brought a substantial enhancement in acetone sensing performance (328.8 % response in 2.5 ppm acetone), which was a 3.4-fold improvement compared with the dark scenarios. The LOD of the sensor was reduced to 50 ppb by visible light excitation, and the response/recovery time (15 s/34 s, in 2.5 ppm acetone) was drastically reduced with a high recovery level of > 97 %. Furthermore, mechanism exploration revealed that introducing g-C 3 N 4 material facilitates photogenerated carrier separation and increases gas adsorption sites, therefore achieving a higher gas response under light. This developed sensor achieved success in initial screening for diabetic ketoacidosis via breath analysis, thereby underscoring its potential for clinical diagnostic applications. This work contributes to explain the interaction of i-MXene with volatile organic compound molecules, and validates the prospect of i-MXene materials as sensitive materials for gas sensors.
研究领域:
气体传感器
·
材料科学
·
光学激发
·
糖尿病诊断
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呼吸分析
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纳米材料
·
化学传感
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Yushan Liu,Wei Li,Peng Wu,Chunhui Ma,Xueyun Wu,Mingcong Xu,Sha Luo,Zhou Xu,Shouxin Liu
Nitrogen and boron co-doped carbon quantum dots (NB-CQDs) were prepared via one-pot hydrothermal treatment of citric acid, borax, and p -phenylenediamine. The synthesized NB-CQDs were characterized by transmission electron microscopy, Fourier-transform infrared spectra, X-ray photoelectron spectra, dynamic light scattering, ultraviolet-visible absorption and fluorescence spectra to characterize their surface morphology, crystal structure, functional groups and elemental composition, and optical properties. It was found that N and B species were efficiently doped into the carbon framework of the dots, the N- and B-Containing groups formed on the surface of NB-CQDs during the hydrothermal reaction. The element doping and surface functionalization of NB-CQDs efficiently modulated their physicochemical properties. The NB-CQDs were nearly mono-disperse with an average particle diameter of 3.53 nm, and the excitation/emission wavelengths were 360/490 nm, respectively. The NB-CQDs showed regular photoluminescence (PL) emission under different excitation wavelengths, and possessed pH-dependent and solvent polarity-dependent PL properties. In addition, the NB-CQDs and a NB-CQD/poly(vinyl alcohol) composite film showed good PL responses to acetone solution and vapor. A PL sensor for the determination of acetone solution with a limit of detection (LOD) of 0.54 μM (R 2 = 0.9956) was then designed. The NB-CQDs were also used for the determination of dopamine. The PL intensity of the NB-CQDs was inversely proportional to the concentration of dopamine in the range of 0.1–70 μM (R 2 = 0.9958). The LOD of dopamine was 11 nM, and PL quenching occurred via a static quenching mechanism. Additionally, these NB-CQDs can be used for multicolor cellular imaging and showed good uptake by Hepg2 cells.
研究领域:
材料科学
·
分析化学
·
生物医学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Li Chen,Liu-Xin Cai,Jing Geng,Chen-Chen Liu,Yue Wang,Zheng Guo
One-dimensional (1D) semiconductor composite nanofibers (NFs) with large specific surface areas , high length-to-diameter ratios, and abundant interfacial active sites have received widespread attention. In this work, a rationally designed 1D composite NFs architecture for detecting acetone is synthesized via a two-step process based on electrospinning followed by a thermal oxidation method. Utilizing the polyoxometalate (POM) as a molecular platform with high negative charges to combine transition metal ions precursors, highly dispersed ZnMoO 4 can be in situ grown on the ZnO. By adjusting the content of POM (H 3 PMo 12 O 40 , denoted as PMo 12 ) in the precursor solution , we can obtain a series of ZnMoO 4 decorated ZnO NFs (ZnMoO 4 -ZnO NFs). Compared with the pristine ZnO NFs, the ZnMoO 4 -ZnO NFs sensor exhibited excellent sensing characteristics over a wide range of acetone concentrations (50 ppb-50 ppm), such as high sensitivity , relatively low detection concentration, and high selectivity . The primary mechanism for the improved acetone gas sensing properties of the ZnMoO 4 -ZnO NFs could be ascribed to the available charge transfer and unique structure within ZnMoO 4 -ZnO NFs.
研究领域:
材料科学
·
纳米科技
·
传感器技术
·
半导体物理
·
环境监测
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Qixuan Qin,Yizhuo Fan,Wei Wang
In this work, Fe2O3 nanocubes doped with different amounts of transition metals (Cu, Zn) were prepared by hydrothermal synthesis and annealing method. Gas sensing performance tests show that the prepared pristine Fe2O3 exhibits the conductive property of an n-type material, while Cu&Zn doped Fe2O3 exhibit p-type conductive property. The sensors based on 5 at% Cu&Zn doped Fe2O3 showed significantly improved response, selectivity, long-term stability, and moisture resistance to acetone compared to the pristine Fe2O3 nanocubes. X-ray photoelectron spectroscopy (XPS) results confirmed that the adsorbed oxygen of 5 at% Cu&Zn doped Fe2O3 were significantly higher than that of the pristine Fe2O3, which is the main reason for the improved gas sensing performances. Therefore, this study provides an effective way to develop low-cost and high-performance gas sensors based on transition metal-doped metal oxide.
研究领域:
材料科学
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纳米技术
·
传感器
·
固体物理
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
NATURE MATERIALS
·
2019
·Vol. 19
·期 2
·203-211
·
IF 38.887
Ren Yuan,Zou Yidong,Liu Yang,Zhou Xinran,Ma Junhao,Zhao Dongyuan,Wei Guangfeng,Ai Yuejie,Xi Shibo,Deng Yonghui
Assemblies of metal oxide nanowires in 3D stacks can enable the realization of nanodevices with tailored conductivity, porous structure and a high surface area. Current fabrication methods require complicated multistep procedures that involve the initial preparation of nanowires followed by manual assembly or transfer printing, and thus lack synthesis flexibility and controllability. Here we report a general synthetic orthogonal assembly approach to controllably construct 3D multilayer-crossed metal oxide nanowire arrays. Taking tungsten oxide semiconducting nanowires as an example, we show the spontaneous orthogonal packing of composite nanorods of poly(ethylene oxide)-block-polystyrene and silicotungstic acid; the following calcination gives rise to 3D cross-stacked nanowire arrays of Si-doped metastable ε-phase WO 3 . This nanowire stack framework was also tested as a gas detector for the selective sensing of acetone. By using other polyoxometallates, this fabrication method for woodpile-like 3D nanostructures can also be generalized to different doped metal oxide nanowires, which provides a way to manipulate their physical properties for various applications.
研究领域:
材料科学
·
纳米技术
·
半导体器件
·
气体传感
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）