SENSORS AND ACTUATORS B-CHEMICAL
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2021
·
IF 7.46
Han Bi,Le-Xi Zhang,Yue Xing,Peng Zhang,Jing-Jing Chen,Jing Yin,Li-Jian Bie
Recently, the influence of polar facets on the gas sensing performance of metal oxides has drawn much attention, yet the facet-dependent gas sensing properties of rare earth oxides have not been reported so far. In this work, taking CeO 2 as an example, uniform single-crystalline nanopolyhedra, nanorods and nanocubes of cubic CeO 2 were selectively prepared by a hydrothermal method at different temperatures and NaOH concentrations, using Ce(NO 3 ) 3 as the cerium source. According to X-ray powder diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) analysis, these CeO 2 nanocrystals possess different exposed crystal planes: {111} and {100} for nanopolyhedra, {110} and {100} for nanorods, and {100} for nanocubes. Abundant defects were confirmed on the surface of three CeO 2 nanocrystals by X-ray photoelectron spectroscopy (XPS), electron paramagnetic resonance (EPR) and photoluminescence (PL). Notably, gas sensors based on these three CeO 2 nanocrystals exhibited distinct response values towards dimethylamine vapor in the following order: nanocubes > nanorods > nanopolyhedra, while excluding the effects of characteristic dimension and specific surface area. The response order of CeO 2 nanocrystals is primarily ascribed to the different content of surface defects and {100} polar facets instead of {111} and {110} nonpolar facets.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Hang Liu,Junlong Liu,Yanchang Liu,Zhihao Qu,Siye Tian,Yuhong Zhang
In this work, the ZnO microsphere is prepared by hydrothermal method and modified with different concentrations of Eu. The morphology of ZnO:Eu sample shows flower-like microspheres with many nanosheets. The gas performance of ZnO:Eu microsphere is investigated for detecting NO 2 . Compared with pure ZnO, the response of ZnO:2 % Eu sensor is increased by 8 times, and the optimal operating temperature of that is decreased to 130 °C. Especially, the gas sensing properties of ZnO:2 % Eu sensor is enhanced under UV excitation. The recovery time of ZnO:Eu sensor is reduced by 1200 s, and the response is increased by 3.6 times under UV excitation. The above results show an increase in sensor response due to doping Eu and UV excitation. At last, the possible gas mechanism of ZnO:Eu is discussed with and without UV excitation. This finding provides important guidance for UV-assisted sensors to enhance NO 2 response.
研究领域:
材料科学
·
环境监测
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 19
·23728-23736
·
IF 2.478
Hu Li-Bin,Huang Xin-Yu,Zhang Shan,Chen Xue,Dong Xian-Hui,Jin He,Jiang Zhen-Yu,Gong Xiao-Ran,Xie Yi-Xuan,Li Chen,Chi Zong-Tao,Xie Wan-Feng
Morphology transformation and crystal growth strategies of metal oxide semiconductors are still extensively studied in material science recently, because the morphology and crystallinity significantly affect the physicochemical characteristics of metal oxide nanomaterials. However, understanding the morphology changes of α -MoO 3 induced by annealing is still a challenge. Herein, the nanostructure transition of α -MoO 3 induced by the annealing temperature is carefully investigated via the XRD and SEM methods. It can be found that crystallization is highly dependent on the annealing temperature. Interestingly, the MoO 3 nanoflowers can change into nanosheets at 500 °C. Afterward, the nanosheets turned into microrods with the increase in annealing temperature due to the continuous growth of MoO 3 crystal. On the other hand, the sensing performances of various MoO 3 nanostructures are studied toward ethanol gas. Compared to the MoO 3 nanoflowers and microrods, the MoO 3 nanosheets-based sensor exhibits superior sensing performance to ethanol, and the maximum response value is 8.06.
研究领域:
材料科学
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化学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2013
·
IF 3.535
Zhenyu Wang,Peng Sun,Tianlin Yang,Yuan Gao,Xiaowei Li,Geyu Lu,Yu Du
The flower-like WO 3 structures were successfully synthesized by a simple calcination of W 18 O 49 nanowires obtained by a microwave-assisted solvothermal method . The as-prepared products were characterized by field emission scanning electron microscopy , X-ray powder diffraction, transmission electron microscopy , and nitrogen adsorption and desorption measurements. The results indicated that the building blocks of the flower-like structure were intercrossing single crystalline WO 3 nanorods with diameter of about 30–40 nm and length of about 300–400 nm. The gas sensing properties of as-prepared products to NO 2 and acetone were investigated. It was found that the sensor based on WO 3 nanostructures exhibited excellent selectivity and high sensitivity toward NO 2 at optimum temperature of 90 °C, giving a response of about 42 to 40 ppb NO 2 . Significantly, operating at 300 °C, the sensor's response and recovery time to 100 ppm acetone was only 1 s and 6 s, respectively.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Xiao Wang,Wenjing Liu,Chenlin Wang,Shouwei Zhang,Meng Ding,Xijin Xu
Oxygen vacancy construction has been regarded as an effective method to enhance the sensing performance of the gas sensors. Herein, in this work, two CuBi 2 O 4 composites with nanoflowers (CBOF) and nanospheres (CBOS) structures were synthesized with similar BET specific surface area, pore size distributions and exposed facets. However, a higher bulk oxygen vacancy concentration was found in the CBOS composites, bringing a higher carrier concentration and lower baseline resistance. As a consequence, the CBOS sensors exhibited better formaldehyde gas sensing performance (10.9–60 ppm gas) than that of the CBOF sensors (5.8). After treated in NaBH 4 solutions, both composites exhibited enhanced surface adsorbed oxygen species and formaldehyde sensing response, owning to the generation of more surface oxygen vacancies to facilitate the surface adsorptions and redox reactions. After that, the Pt nanoparticles were decorated on the CBOS surface with a reduced method. The formaldehyde sensing response and selectivity were further enhanced due to the surface catalytic activity of the Pt nanoparticles. This work proves that CuBi 2 O 4 composites can be an ideal sensing platform through oxygen vacancy construction and noble metal sensitization, and will facilitate the development of p-type ternary sensing materials.
研究领域:
材料科学
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化学工程
·
传感器技术
✓ 已验证
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 4
·904
·
IF 3.1
Jianwei Zhang,Baoyu Huang,Xinlei Li,Chao Yang,Wenzhuo Zhao,Xiuhua Xie,Nan Wang,Xiaogan Li
The fluorinated titanium dioxide (F-TiO2) hollow spheres with varying F to Ti molar ratios were prepared by a simple one-step hydrothermal method followed by thermal processing. The diameter of the F-TiO2-0.3 hollow spheres with a nominal ratio of F:Ti = 0.3:1 was about 200–400 nm. Compared with the sensor based on pristine TiO2sensing materials, the F-TiO2-0.3 sensor displayed an enhanced sensing performance toward gaseous formaldehyde (HCHO) vapor at room temperature under ultraviolet (UV) light irradiation. The F-TiO2-0.3 sensor demonstrated an approximately 18-fold enhanced response (1.56) compared to the pristine TiO2sensor (0.085). The response and recovery times of the F-TiO2-0.3 sensor to 10 ppm HCHO were about 56 s and 64 s, respectively, and a limit-of-detection value of 0.5 ppm HCHO was estimated. The F-TiO2-0.3 sensor also demonstrated good repeatability and selectivity to HCHO gas under UV light irradiation. The outstanding HCHO gas-sensing properties of the F-TiO2-0.3 sensor were related to the following factors: the excitation effect caused by the UV light facilitated surface chemical reactions with analyte gas species; the hollow sphere structure provided sufficient active sites; and the surface fluoride (≡Ti−F) created additional chemisorption sites on the surface of the TiO2material.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Abebe Setiye,Guoqing Feng,Qiushuang Xu,Chuntao Wang,Chengwen Song,Huixia Lu
Triethylamine (TEA), a toxic and explosive volatile organic compound (VOC) gas, is hazardous to human health and the environment. Therefore, it is crucial to develop crystal-faceted TEA gas sensors with improved sensitivity and rapid detection capabilities. In this study, TiO 2 nanocrystal sensors with different crystal facets of anatase {101} and {001} and rutile {110} were synthesized using the hydrothermal method. The nanomaterials underwent characterization through XRD, SEM, TEM, XPS, and BET analysis. The results revealed that the materials exhibited bipyramid anatase {101} facet, nanorod anatase {001} facet, and rutile {110} facet. The sensors demonstrated superior gas sensing performance in the following order: {101} > {110} > {001} facets to 100 ppm TEA gas at 240 °C. The sensors also exhibited short response and recovery times, low detection limits, excellent stability, repeatability, and selectivity. The enhanced sensing properties of {101} faceted TiO 2 can be ascribed to the bipyramid structure and crystal facets with higher adsorbed oxygen peak specific area, which provide numerous active sites and improved extra oxygen-active site species. This study offers valuable insight into the design mechanism to enhance the TEA response of {101} faceted TiO 2 and further contributes to our understanding of the sensitivity of crystal faceted sensors.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Zhihua Zhao,Yao Wang,Wei Chen,Guixin Jin,Qingsheng Shi,Baocang Zhou,Yafang Pan,Lan Wu,Zhigang Shao
Ammonia (NH 3 ) is one of the most detrimental environmental pollutants emanating from various industrial processes. Therefore, the preparation of ammonia sensors with excellent performance holds the utmost significance, ensuring environmental quality and human health. In this study, through the self-redox reaction between Ti 3 C 2 T x and Ag + , Ag nanoparticles (NPs) loaded Ti 3 C 2 T x MXene (Ag@MXene) were directly prepared. The as-synthesized materials were conducted a comprehensive investigation into their gas-sensing properties and were characterized utilizing analytical techniques such as XRD (X-ray Diffraction), XPS (X-ray Photoelectron Spectroscopy), SEM (Scanning Electron Microscope), and EDS (Energy-Dispersive X-ray Spectroscopy). According to the experimental findings, the Ag@MXene sensor responds to NH 3 remarkably well at room temperature, about 7 times more effectively than pure MXene performs under the same condition. Density functional theory (DFT) investigations were additionally carried out to further clarify the gas-sensing mechanisms. The technique for creating high-precision and room-temperature gas sensors is described in this paper as a workable strategy.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Runjiang Guo,Hongdong Wang,Ran Tian,Dongliang Shi,Hua Li,Yao Li,Hezhou Liu
In this report, a novel hollow boxes shape ZnSnO 3 is synthesized via a one-pot surfactant-free method. We synthesize CNT@ZnSnO 3 hollow boxes via hydrothermal reaction by using the Zn-MOF(ZIF-8) as the Zn source at the first time. Several characterization techniques are used to investigate the structure, morphology, composition and specific surface area of CNT@ZnSnO 3 . CNT@ZnSnO 3 hollow boxes demonstrated large specific surface area (up to 45.73 m 2 /g), which is favorable for the strong gas sensor response. The ethanol sensor based on CNT@ZnSnO 3 hollow boxes exhibited high response of ethanol up to 166 at 240 °C at the concentration of 100 ppm, which is about 8 times higher than the sensing response of ZnSnO 3 nanocubes. Moreover, CNT@ZnSnO 3 hollow boxes based ethanol sensor also shows the excellent selectivity and stability. As a novel green gas sensor, CNT@ZnSnO 3 hollow boxes show the great potential in the gas sensing field.
研究领域:
材料科学
·
化学工程
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Baoqing Han,Jiuhong Wang,Wanying Yang,Xiaowei Chen,Hairong Wang,Jialuo Chen,Cheng Zhang,Jianhai Sun,Xueyong Wei
Isoprene is a typical biomarker for advanced fibrosis and can be used to screen and grade chronic liver disease (CLD). To detect trace isoprene, the high specific surface area (77.38 m 2 /g), porous flower-like In 2 O 3 hierarchical microsphere material was prepared by simple hydrothermal method. In addition, the sensor based on synthetic flower-like In 2 O 3 microspheres was prepared and gas sensing properties were investigated. The results showed that flower-like In 2 O 3 nanomaterials had the highest response to isoprene at 190 °C. The response time was 53 s and repeatability was good. The relatively low operating temperature (190 °C) could extend the working life and also facilitate the portable application of the sensor. Meanwhile, the sensor exhibited selectivity over other typical biomarkers (ammonia, ethanol, hydrogen, and carbon monoxide). The unmodified pure flower-like In 2 O 3 material could detect 5 ppb of isoprene at 190 °C and the logarithm of the response had good linear relationship with the logarithm of the concentration. Thus, this flower-like In 2 O 3 material was promising to be developed into the portable breath isoprene detector that could be integrated into a micro system for noninvasive rapid screening and grading of CLD.
研究领域:
材料科学
·
医学诊断
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2022
·
IF 4.291
Yunjing Zhu,Yunlei Ma,Dandan Wu,Guojian Jiang
In this paper, ZnO/Ti 3 C 2 T x composites containing different proportions of Ti 3 C 2 T x were synthesized by hydrothermal method . The effects of different proportions of MXene content on the gas sensing properties of ZnO/Ti 3 C 2 T x composites were studied. It is found that ZnO/Ti 3 C 2 T x composites show a good response to acetone and excellent reversibility and the ZnO/Ti 3 C 2 T x composites containing 2 wt% Ti 3 C 2 T x had the highest response to acetone. The gas-sensing performance of ZnO/multi-layer MXene and ZnO/few-layer MXene were compared. The results showed that ZnO/Ti 3 C 2 T x composites with few-layer MXene had a higher response to acetone, 14.4, indicating that the few-layer MXene solution has better dispersion for ZnO and gas-sensing properties. Finally, the gas sensing mechanism of few-layer MXene/ZnO was suggest.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2022
·
IF 4.291
Baohui Zhang,Zhiqiong Li,Chong Li,Min Li,Chen Fu,Ran Tao,Xian-hu Zha,Honglang Li,Jingting Luo
This paper demonstrates chemi-resistive type and QCM ammonia sensors based on Ti 3 C 2 T x MXene with surface engineering. The morphology and structure composition of Ti 3 C 2 T x MXene were completely tested by XRD, SEM, TEM and Raman. The ammonia sensing performance of Ti 3 C 2 T x MXene sensors at room temperature were systematically studied. The QCM sensors show better performance towards ammonia than chemi-resistor sensors. The Ti 3 C 2 T x -S QCM sensor possesses quite sensitivity (49 Hz@100 ppb), high response/recovery capability (33 s/58 s) and good selectivity . XPS was introduced for the surface element status for the potential ammonia adsorption mechanism. It can be mainly related to for lowest average potential for reaction of Ti-S and the additional absorption towards the product nitric oxides enhancing the frequency shift by absorption mass increasing. This work confirms that surface engineering of Ti 3 C 2 T x MXene to be effective method for enhancing gas sensing performance, and the sensor shows potential application for low concentration ammonia sensing.
研究领域:
材料科学
·
传感器技术
✓ 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）