Nanomaterials
·
2018
·Vol. 8
·期 12
·1025
·
IF 3.504
Dongping Xue,Yan Wang,Jianliang Cao,Zhanying Zhang
Developing the triethylamine sensor with excellent sensitivity and selectivity is important for detecting the triethylamine concentration change in the environment. In this work, flower-like CeO2-SnO2composites with different contents of CeO2were successfully synthesized by the one-step hydrothermal reaction. Some characterization methods were used to research the morphology and structure of the samples. Gas-sensing performance of the CeO2-SnO2gas sensor was also studied and the results show that the flower-like CeO2-SnO2composite showed an enhanced gas-sensing property to triethylamine compared to that of pure SnO2. The response value of the 5 wt.% CeO2content composite based sensor to 200 ppm triethylamine under the optimum working temperature (310 °C) is approximately 3.8 times higher than pure SnO2. In addition, CeO2-SnO2composite is also significantly more selective for triethylamine than pure SnO2and has better linearity over a wide range of triethylamine concentrations. The improved gas-sensing mechanism of the composites toward triethylamine was also carefully discussed.Keywords:CeO2-SnO2;nanostructure;hydrothermal;triethylamine;gas sensor
研究领域:
材料科学
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化学工程
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传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
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2025
·
IF 6.3
Yan Chen,Qingsong Luo,Yu Wan,Shuang Gao,Yanting Wang,Changhao Feng
Background The rapid identification of n-butanol holds substantial significance; however, the current response speed of n-butanol gas sensors is relatively slow. The ZnO/SnO 2 composite nanofibers present a considerable prospect as a suitable alternative for conventional n-butanol sensors. Methods Pure SnO 2 and composite nanofibers composed of ZnO/SnO 2 with distinct molar ratios were crafted via the electrospinning technique. The microstructure and components of these composite nanofibers were analyzed and identified using XRD and SEM. Significant findings The ZnO/SnO 2 composite nanofibers-based gas sensor (ZS2) exhibited enhanced response towards n-butanol, achieving a high response of 29.68 to 30 ppm n-butanol at 150 °C, which was 3.3 times greater than that of SnO 2 . Moreover, the sensor also showcased a swift response time, taking just 1 s to react. Furthermore, the ZS2 sensor had a lower potential limit for detecting n-butanol, with a value of 0.27 ppm. The good repeatability and stability were also confirmed in this study. The successful creation of heterojunctions is thought to be contributing factors to ZS2 nanofibers’ superior sensing capabilities. Therefore, ZnO/SnO 2 composite nanofibers can be considered as a promising candidate for sensing materials in practical applications.
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
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2017
·Vol. 43
·期 9
·5217-5228
·
IF 1.369
Qin Na,Jing Kaiqiang,Chen Rui,Xiong Jinhua,Liang Ruowen,Li Zhaohui,Wu Ling
Abstract SnS 2 /SnO 2 nanocomposites have been successfully prepared via a hydrothermal method using electrospun SnO 2 nanotubes as both substrates and reactants. The ratios of the nanocomposites are controlled by varying the concentration of thioacetamide during the solvothermal synthesis processes. The as-prepared SnS 2 /SnO 2 nanocomposites exhibit considerable improvement on the photocatalytic activities for the reduction of aqueous Cr(VI) under visible light irradiation. Their photoactivities are also much higher than that of SnS 2 nanoplates and a physical mixture of SnO 2 and SnS 2 . In particular, the SnS 2 /SnO 2 -B sample exhibits the highest photocatalytic activity. After visible light irradiation for 60 min, the reduction rate has reached about 100%. The photoelectrochemical analyses further show that the high photocatalytic activity of the SnS 2 /SnO 2 -B sample can be ascribed to the unique structural features and the intimate interfacial contact between SnS 2 and SnO 2 , which is more effective separation of the photo-generated carriers. Graphical Abstract
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yingyue Wang,Guojian Zhang,Jinyang Huang,Mengying Long,Dongmin An
In this paper, pure SnO 2 and SnO 2 composite materials (ZSnO 2 ) modified with different amounts of ZIF-67 (20 mg, 60 mg) were synthesized utilizing a simple solvothermal method. The gas sensing performance of these sensitive materials was tested, and the results manifested that at a low operating temperature of 170 ℃, the responses of ZSnO 2 -60 and ZSnO 2 -20–50 ppm triethylamine (TEA) gas reached 142.6 and 83.7, respectively, which was ∼3.81 and ∼2.24 times that of pure SnO 2 (34.7). In addition, both doped samples had lower operating temperature, excellent selectivity and repeatability towards TEA gas. The doping of ZIF-67 led to oxygen vacancies increasing, specific surface area amplifying and p-n heterojunctions forming between Co 3 O 4 and SnO 2 in ZSnO 2 nanocomposites. These synergistic effects enhanced the gas sensitivity of ZSnO 2 nanocomposites to TEA gas.
研究领域:
材料科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2017
·
IF 5.401
Li Xiao,Shengrui Xu,Geng Yu,Shantang Liu
A novel gas microsensor combining SnO 2 submicron/nanostructured porous sensitive film with Micro-Electro-Mechanical systems (MEMS) microheater was successfully fabricated. The film was made of hierarchically mixed Pd/SnO 2 (HM-PTO) composites composed of Pd/SnO 2 hollow submicrospheres (Pd/SnO 2 -HSs) and Pd/SnO 2 nanoparticles (Pd/SnO 2 -NPs) deposited on the microheater platform using the microdispensing method. The as-prepared HM-PTO sensors exhibited high sensitivities, fast response/recovery rates, good selectivity, reliable reversibility, and relevant stability towards ethanol at low power consumption. The resulting superior sensing performances were attributed to the unique hierarchical structure. The internal void architecture of Pd/SnO 2 -HSs provided large specific surface areas, proper mesopore size distribution, large number of active adsorption/interaction sites, as well as promoted the chemisorption and dissociation of gas molecules due Pd-doping to yield superior gas response. In particular, the nano-sized SnO 2 particles ensured the uniform deposition of the materials to yield enhanced local conductivities, and possibly faster phase transfer reactions responsible for the extremely good response/recovery performance. This simple fabrication procedure combined with high sensing performances look promising for the development of hierarchical morphologies of novel materials for gas sensing applications.
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
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Yongheng Du,Yanfeng Zhang,Ling Li,Ning Wang,Yujun Chai
The combination of Sb 2 O 3 or SnO 2 with graphene has become a research hotpot in recent years. However, several problems, namely the loading of the active materials, space utilization in composites, and the intrinsic volume expansion of Sb 2 O 3 and SnO 2 , have yet to be fully resolved. To overcome these disadvantages, in this work Sb 2 O 3 /carbon nanotubes (CNTs)/SnO 2 composite have been synthesized, in which the CNTs act as a network to ensure the electronic conductivity and buffer of the volume expansion. The SnO 2 nanoparticles are aligned by the CNTs and Sb 2 O 3 is dispersed in the voids between them. Space utilization and the loading of the oxides are thereby maximized. Moreover, the resultant composite retains small amount of water or alcohol, which does not affect the cyclic stability, but may have increased the ionic and electronic conductivity, improving the electrochemical performance. A discharge capacity of 910 mAh g −1 after 250 cycles at 100 mA g −1 is realized for Sb 2 O 3 /CNT/SnO 2 . Moreover, the contribution of the pseudocapacitance to the rate discharge capability is obvious, which arises from the different heterointerfaces between Sb 2 O 3 /CNTs, CNTs/SnO 2 or Sb 2 O 3 /SnO 2 . The homogenous distribution of Sn and Sb in CNTs after cycling leads to a lower discharge voltage, improving the application prospects. Although some collapse and cracks are detected, the CNTs network connects the oxides, ensuring the structural stability and the cyclic stability of Sb 2 O 3 /CNT/SnO 2 . This strategy represents a new concept for the design of multi-component materials for lithium storage.
研究领域:
材料科学
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能源存储
✓ 已验证
DOI
高影响因子
NANO
·
2019
·
IF 1.293
Fei Li,Guang Zhang,Yinghua Song
A simple hydrothermal conversion method for the preparation of Ag 3 PO 4 /SnO 2 composite photocatalyst has been developed. The morphological properties of the nanocomposites are studied using transmission electron microscopy (TEM), energy dispersive spectrometer (EDS), X-ray powder diffraction (XRD) and other methods. Different properties of catalysts are prepared by adjusting the temperature of hydrothermal reaction and the volume ratio. The prepared photocatalyst is tested by degradation of tetracycline solution under visible light show that the degradation rate of tetracycline can reach 74% when the initial [Ag 3 PO 4 ]/[SnO 2 ] molar ratio is 15 and the temperature is 140 ∘ C. Moreover, by constructing Ag 3 PO 4 /SnO 2 composite structure, the impedance and photocurrent of material are enhanced significantly according to the electrochemical characterization.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Yaqian Pang,Junpeng Zhou,Xiaoli Yang,Yeqing Lan,Cheng Chen
In this study, the Co 3 O 4 -SnO 2 composite derived from bimetallic oxalates was rationally fabricated and utilized as a catalyst for peroxymonosulfate (PMS) activation towards the destruction of chloramphenicol (CAP). The physicochemical properties of the Co 3 O 4 -SnO 2 were systematically characterized to discover the relationship between its structure and catalytic performance. SnO 2 as a cocatalyst with high conductivity and stability immensely improved the activity of Co 3 O 4 in the Co 3 O 4 -SnO 2 composite. Approximately 98% of CAP (10 mg/L) was eliminated by the Co 3 O 4 -SnO 2 (0.1 g/L) activated PMS (1.0 mmol/L) at initial pH 7 within 20 min. The rationally designed Co 3 O 4 -SnO 2 composite exhibited higher catalytic activity than Co 3 O 4 , SnO 2 , and other cobalt-based bimetallic oxides (such as Co-Fe, Co-Mn, and Co-Cu) in the PMS activation for the CAP degradation. The synergistic effect of Co 3 O 4 and SnO 2 endowed the Co 3 O 4 -SnO 2 composite with higher conductivity and more electron transfer, which was proved by the electrochemical tests. The presence of SO 4 •− , • OH, O 2 •− , and 1 O 2 during the CAP degradation was testified by both quenching experiments and electron paramagnetic resonance (EPR) spectroscopy. In addition, the catalytic mechanism and degradation pathways were further proposed via the characterization of X-ray photoelectron spectroscopy (XPS) and the identification of transformation products, respectively. This work provides a new insight into the preparation of novel catalysts and their application in wastewater treatment.
研究领域:
环境科学
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催化材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 6
·3237-3249
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IF 2.779
Wang Siyu,Guo Jiaxiong,Lin Zhidong,Liu Liming,Hui Yuchong,Zhang Xiaowen
A series of very small grain Au/SnO 2 composites were synthesized by a facile hydrothermal method. The microstructure of the Au/SnO 2 composites were characterized by X-ray diffraction, scanning electron microscope, transmission electron microscopy, and nitrogen adsorption–desorption experiment. The composites were composed of 20–30 nm spherical nanoparticles, which are hierarchical structure composed of 8 nm Au cores and 5 nm SnO 2 nanograins. The composites were porous material with large specific surface area. The sensors based on the Au/SnO 2 composites showed high sensitivities and selectivity to n -butanol at low working temperature with fast response. Among these sensors, the 1.5 wt% Au/SnO 2 -based sensor shows the highest response (2662.8) to 100 ppm n -butanol with the response time of 35 s at 80 °C. The excellent low-temperature gas-sensing properties of the Au/SnO 2 sensors can be ascribed to the synergetic effect of high surface energy of small SnO 2 nanograins and catalysis of gold nanoparticles. Our study demonstrates that controlling the grain size of SnO 2 and Au nanoparticle-assisted gas sensing are effective methods to improve the sensing properties of SnO 2 at low working temperature. The 1.5 wt% Au/SnO 2 composite is a potential low-temperature gas-sensing material for n -butanol detection.
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
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Feifei You,Yunan Zhou,Danyang Li,Hao Zhang,Dawei Gao,Xiaohong Ma,Rui Hao,Juzhe Liu
Photoreduction of CO 2 to value-added chemicals and fuels is an attractive solution to alleviate environmental problems and energy crisis at the same time. However, engineering efficient photocatalysts with high activity and product selectivity is still challenging. Herein, we achieved three-dimensional (3D) spatial configuration design at micro-scale and heterogeneous interface construction at nano-scale on a SnS 2 /SnO 2 composite, which featured hierarchical flower-like morphology consisted of nanosheets and type-II semiconductor structure . It behaved excellent selectivity and impressive photocatalytic CO 2 -to-CO performance with a yielding rate of 60.85 μmol g -1 h −1 , roughly 3 times higher than that of SnS 2 and was in the front rank of this kind catalysts under 300 W Xe lamp illumination without using any sensitizers or noble metals . The enhanced catalytic capability could be attributed to the elaborately built structure with suitable energetic position that afforded effective separation and migration of photo-generated electron/hole pairs as well as enhanced light caption and absorption. Meanwhile, main reactive intermediates (e.g., CO 2 – and *COOH) were captured by in-situ Fourier transform infrared spectroscopy (FTIR), suggesting a fluent catalytic pathway on the SnS 2 /SnO 2 platform. This work provides a new scheme to build advanced catalysts based on multiscale design and rational phase assembling.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POROUS MATERIALS
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2022
·Vol. 30
·期 3
·723-737
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IF 2.523
Ke Yi-Hu,Qin Hong-Yu,Wang Xue,Li Hui,Liu Hai,Yuan Hong
Selective catalytic oxidation of polyols, e.g., the selective catalytic oxidation of the secondary –OH bond in glycerol, remains a considerable challenge. In this study, a series of mesoporous CuO–SnO 2 composite oxides were prepared by a hard-template method and used to support Au catalysts for the selective oxidation of glycerol to 1,3-dihydroxyacetone (DHA) under base-free conditions. Catalysts with different Cu:Sn molar ratios gave different catalytic performances. A high conversion of glycerol (100%) and selectivity for DHA (94.7%) were obtained in 2 h at 80 °C and P O2 = 1 MPa over the Au/CuO–SnO 2 -3:1 catalyst. Further investigation indicated that the high catalytic activity of Au/CuO–SnO 2 -3:1 is related to the small size and high dispersion of Au nanoparticles (NPs), the interactions between the Au NPs and the support, the synergistic effect between CuO and SnO 2 , and the amount of surface lattice oxygen species. Various reaction parameters, namely the glycerol:Au molar ratio, the reaction temperature, the initial O 2 pressure, the reaction time, and the support calcination temperature were studied. Although the conversion rate by the catalyst decreased after four cycles, the selectivity remained above 86%. Density functional theory calculations showed that the synergy between CuO and SnO 2 improves the catalytic activity in glycerol oxidation to DHA. The results show that mesoporous composite oxide supports have a wide range of potential applications in the selective oxidation of glycerol to other high-value-added products.
研究领域:
催化化学
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材料科学
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绿色化学
✓ 已验证
DOI
高影响因子
Chemosensors
·
2023
·Vol. 11
·期 1
·31
·
IF 4.2
Xilai Lu,Menghan Wu,Yong Huang,Jiannan Song,Yong Liu,Zhiqiao Yan,Feng Chen,Jieting Zhao,Wanping Chen
The slight but cumulative influence of impurity gases in air poses a great threat to the long-term stability of room-temperature gas sensors. Room-temperature hydrogen-sensitive Pt–SnO2composite nanoceramics of 5 wt% Pt were prepared through pressing and sintering. The response of a sample was over 10,000 after being exposed to 500 ppm H2S–20% O2–N2at room temperature, and the room-temperature hydrogen sensing capacity was seriously degraded even for samples that had aged dozens of days since H2S exposure. Mild heat treatments such as 160 °C for 10 min were found able to fully activate those H2S-exposed samples. As the peak of S 2p electron was clearly detected in H2S-exposed samples, it was proposed that for room-temperature hydrogen-sensitive Pt–SnO2composite nanoceramics, H2S exposure induced degradation results from the poisoning of Pt by H2S deposited on it, which can be removed through a mild heat treatment. Periodic mild heat treatment should be a convenient and effective measure for room-temperature metal oxide gas sensors to achieve long-term stability through preventing the accumulation of impurity gases in air deposited on them.
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
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