Surfaces and Interfaces
·
2025
·
IF 6.3
Danyang Wang,Menghan Xu,Kuangyi Li,Yong Yan,Xue Chen,Dongqi Yu,Rongrong Jia,Lei Huang
Ethanol sensors with low energy consumption and high performance have been applied in a wide range of areas. In this work, Pt-modified SnO 2 -TiO 2 composite nanomaterials prepared through ball milling and impregnation-reduction are fabricated for constructing microelectromechanical systems (MEMS) ethanol sensor. Tiny Pt nanoparticles are found uniformly dispersed on SnO₂-TiO₂. High quality gas-sensitive films are concentrated in the functional area of the MEMS chip. The loading of Pt significantly enhances the response to ethanol and reduced the optimal operating temperature. The 1.5% platinum-modified composite (A-ST) demonstrates a significant improvement in sensitivity to 50 ppm ethanol, with its response rising from 21.3 to 52.1, while the optimal operating temperature is reduced by 28°C, dropping from 288°C to 260°C. The limit of detection (LOD) is 240 ppb. This enhancement is primarily due to the n-n junction at the interface between SnO 2 and TiO 2 , along with the chemical and electronic sensitization effects generated by Pt on SnO 2 -TiO 2 .
研究领域:
材料科学
·
传感器技术
·
纳米科技
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2014
·Vol. 16
·期 47
·10863-10869
·
IF 3.858
Banghong Zhou,Shuanglei Yang,Wei Wu,Lingling Sun,Mei Lei,Jun Pan,Xiang Xiong
One-dimensional semiconductor heterostructures with unique properties are suited to application in the photocatalysis field. In this study, rationally designed SnO2@TiO2 porous nanowire–nanosheet heterostructures were realized by a facile hydrothermal method via loading TiO2 nanosheets onto SnO2 porous nanowires. One-dimensional porous heterostructures formed via the self-assembly process. Due to the improved photon absorption ability and more active sites, the special heterostructures showed enhanced photocatalytic properties under mixed light, nearly 2.5 times faster than that of SnO2 porous nanowires. Our results suggest that the SnO2@TiO2 porous nanowire–nanosheet heterostructures are promising as photocatalysts.
研究领域:
材料科学
·
光催化领域
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2022
·
IF 4.644
Honglan Huang,Shengzhe Zhao,Yi Yang,Yan Wang,Ran Lu,Yun Lu,Jinju Chen
Axially wrinkled SnO 2 /TiO 2 heteronanotubes have been successfully prepared by sacrificial template method combined with hydrothermal synthesis. The special folded morphology of SnO 2 /TiO 2 nanostructures may provide more active sites, and the S-scheme heterojunction between SnO 2 and TiO 2 enhances the separation of photogenerated electron-hole pairs, which are conducive to the improvement of photocatalytic degradation for organic pollutants. Using SnO 2 /TiO 2 nanotubes as catalyst, the removal rate of Rhodamine B (RhB), methyl orange (MO) and tetracycline hydrochloride (TCH) under the irradiation of a xenon lamp is 93%, 91% and 85%, respectively. After five cycles, the removal efficiency of organic pollutants maintains almost unchanged, indicating that the synthesized SnO 2 /TiO 2 nanotubes has good stability and reusability. In addition, trapping experiments have been carried out to investigate the major reactive oxidative species for organic pollutants photodegradation. This study provides a facile avenue to design nanotublar photocatalysts with enhanced degradation performance for organic pollutants.
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
Rui Li,Wei Xiao,Chang Miao,Rui Fang,Zhiyan Wang,Mengqiao Zhang
A novel sphere-like SnO 2 /TiO 2 composite is synthesized via spray-drying followed by calcination as confirmed by X-ray diffraction and field emission-scanning electron microscopy analyses; the SnO 2 /TiO 2 composite is composed of the tetragonal cassiterite-like SnO 2 nanoparticles and anatase-like TiO 2 nanospheres . The characterization results show that the optimal stoichiometric ratio of SnO 2 /TiO 2 is approximately 3:1 when the composite serves as the anode for lithium ion batteries, in which the composite electrode not only delivers a high initial discharge specific capacity of 1476 mAh g −1 and retains 483 mAh g −1 after 40 cycles at 500 mA g −1 but also presents a low transfer resistance of approximately 56.33 Ω, a high Warburg coefficient of up to 85.82 Ω cm 2 s −0.5 , and a high lithium ion diffusion coefficient of approximately 6.934 E-15 cm 2 s −1 at ambient temperature. These excellent electrochemical properties suggest that the SnO 2 /TiO 2 composite electrode may be a promising anode material for lithium ion batteries .
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
X.L. Xu,M.Y. Wang,H.T. Jiang,W.W. Liu,G.R. Sun,W. Ma
The high working temperature of metal oxide semiconductors hinders its application in flexible sensing devices. In this paper, a UV-activated flexible sensor operating at room temperature (RT, 25℃) is first reported based on SnO 2 nanoparticles embedded in photo-catalytic TiO 2 nanorods matrix. The UV-irradiated SnO 2 /TiO 2 sensor exhibits excellent selectivity (109 ppm, 37 %) to CH 3 COOH and reduced response/recovery time (12 s/41 s). The excellent RT flexible sensing properties are attributed to the synergistic action of UV-365 nm irradiation, the hetero-embedded microstructure and innovative terpineol binder. UV irradiation generates substantial e h υ − - h h υ + pairs, which serve as active sites to promote the chemisorption and redox reactions. Additional activation energy helps to improve adsorption/desorption kinetics. The heterojunction provides abundant channels, facilitating the separation and transfer of photogenerated carriers. The effect of relative humidity (RH) and temperature variations around RT on the sensor response towards CH 3 COOH are investigated. Under low-RH (35 %-45 %) and high-RH conditions (above 45 %), 1 % RH change has the same effect on the sensor response than 7.2 ppm and 59.4 ppm CH 3 COOH, respectively. 1°C temperature change exhibits the same effect than 17.9 ppm CH 3 COOH. Such a noise effect is by far not suitable for real-world applications. In addition, the response to 109 ppm CO reaches up to 89.5. Therefore, the sensor is seriously disturbed by CO and further research is needed. Above all, UV assistants, hetero-composites combining with innovative microstructure design are expected to be a collaborative enhancement strategy for MOSs-based RT flexible sensors.
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
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Peng Wang,Cong Xie,Tong Song,Ping Yang
Amorphous SnO 2 was coupled on the surface of mixed-phase TiO 2 nanoflowers (NFs) by a solvothermal synthesis. Various characteristics confirms the formation of SnO 2 /TiO 2 heterostructures. As-prepared amorphous SnO 2 /TiO 2 heterostructures revealed uniform morphology and enhanced photoelectrochemical performance. Underfull-spectrum light irradiation, the SnO 2 /TiO 2 heterostructures with an optimized SnO 2 ratio revealed the best photoreduction performance, in which Cr(VI) of 99% was removed within 30 min. This is ascribed to the introduction of amorphous SnO 2 , which adjusted the band gap structure, increased specific surface area of TiO 2 NFs, and greatly enhanced the photoelectric conversion efficiency. The mechanism of the heterostructure formation and enhanced photoreduction for Cr(VI) ions were discussed. The TiO 2 NFs with a mixture phase helps to improve the separation efficiency of photogenerated carriers. This result provides an unique idea for the construction of heterostructures.
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
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Ao Zhang,Yan Zhang,Weihua Cheng,Xinran Li,Kai Chen,Fangjie Li,Dongye Yang
This study presents a novel strategy for the rapid detection of hydrogen and ammonia gases through the synthesis of a composite material that integrates SnO 2 and TiO 2 into an n-n heterostructure on the surface of two-dimensional layered Ti 3 C 2 Tx MXene. The incorporation of Pd nanoparticles significantly enhances the sensor's adsorption and sensing capabilities, particularly for hydrogen. The resulting dual-gas sensor demonstrates a pronounced linear response to hydrogen with a low detection limit of 200 ppb, along with rapid response times, excellent repeatability and long-term stability. Leveraging MXene's superior ammonia adsorption properties, the sensor also exhibits commendable linearity and robustness in detecting ammonia, with strong resistance to humidity-induced interference. To further improve the sensor's performance, machine learning techniques such as support vector machine (SVM) and artificial neural network (ANN) are incorporated, substantially enhancing the sensor's selectivity and sensitivity of the detection. These advancement enables the precise identification and quantification of complex gas mixtures containing hydrogen and ammonia. The sensor’s meticulously designed circuitry operates in real-time sensing mode, ensuring accurate differentiation between the two gases. This research establishes a robust foundation for the development of advanced gas sensing technology, showcasing its potential for multi-gas detection and analysis across diverse industrial and environmental applications.
研究领域:
材料科学
·
传感器技术
·
人工智能
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2022
·Vol. 9
·期 13
·2102464
·
IF 6.389
Weihuang Wang,Liquan Yao,Jiabin Dong,Li Wu,Zixiu Cao,Li Hui,Guilin Chen,Jingshan Luo,Yi Zhang
An undesirable p–n heterojunction interface of Sb 2 Se 3 absorber with Cd-free electron transport layer (ETL) is one of the key problems hindering the efficiency improvement of Sb 2 Se 3 solar cell. Herein, a promising SnO 2 /TiO 2 ETL coupled with SbCl 3 treatment is introduced to improve the performance of Sb 2 Se 3 solar cell. The mechanism of SbCl 3 treatment on the crystal orientation of Sb 2 Se 3 thin film and the p–n heterojunction interface of Sb 2 Se 3 solar cell is disclosed combined with different characterization methods. The carrier transport property for Sb 2 Se 3 thin film is enhanced, and the conduction band offset (CBO) of TiO 2 /Sb 2 Se 3 interface is reduced from 0.57 to 0.20 eV by forming Sb 2 O 3 interlayer at TiO 2 /Sb 2 Se 3 interface after SbCl 3 treatment, by which the interface recombination and the open circuit voltage deficit of the device can be effectively decreased, and the interface bonding at TiO 2 /Sb 2 Se 3 interface can be effectively improved. Ultimately, the Cd-free Sb 2 Se 3 solar cell with configuration of ITO/SnO 2 /TiO 2 /Sb 2 Se 3 /Au achieves an efficiency of 5.82%, which is the highest efficiency in vapor transport deposition (VTD)-processed Cd-free Sb 2 Se 3 solar cell at present. This work is expected to fill in the blank of VTD-processed Cd-free Sb 2 Se 3 solar cell and offers a valuable reference for future band alignment of Sb 2 Se 3 solar cell.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
MATERIALS TECHNOLOGY
·
2015
·
IF 1.227
Z. L. Zhang,M. L. Wang,Y. L. Mao
In this paper, heterojunction semiconductors of Sb-SnO2/TiO2 were prepared with varying molar ratios of Sb-SnO2 to TiO2. The separation efficiency of the photogenerated carriers was characterised by the surface photovoltage (SPV) technique, and the trap density was measured by an electrochemical method. The trap density was measured to be 7·48×1016, 6·01×1016, 5·43×1016, and 6·61×1016 cm−2 for TiO2 and Sb-SnO2/TiO2 films with molar ratios of 1, 2, and 3%, respectively. The SPV enhancement was estimated to be 1, 1·36, 7·64, and 6·36 for TiO2 and Sb-SnO2/TiO2 films with molar ratios of 1, 2, and 3%, respectively. The results indicate that SPV enhancement increases with decreasing trap density, which demonstrates that the trap density is an important factor affecting the separation efficiency of photogenerated carriers in heterojunction semiconductors.
研究领域:
材料科学
·
半导体物理
✓ 已验证
DOI
高影响因子
AATCC Journal of Research
·
2024
·
IF 0.6
Jun Xu,Yuhang Wen,Qiqi Chang,Tianxu Hao,Tianhong He,Jian Zhang,Lei He,Chenxu Zhang,Yuanjun Liu
SnO2 is a wide-band gap N-type semiconductor material with a higher electron transfer rate than TiO2. Therefore, SnO2 has broad application prospects in the photoanode composite materials of dye-sensitized solar cells (DSSC). In this study, SnO2–TiO2 composite nanofibers with different molar ratios (5%, 10%, 15%, and 20%) were prepared by double-needle electrospinning technology, and the nanofibers were characterized after adjusting the solution composition. Different molar ratios of TiO2 and SnO2–TiO2 composite nanofiber photoanodes were fabricated by spin-coating, and the adsorption behavior of dyes on the photoanodes was investigated. Moreover, the electrochemical impedance of the photoanodes and DSSC and their photoelectric performance were also tested. The experimental results showed that SnO2–TiO2 composite nanofibers with a molar ratio of 10% exhibited excellent properties, including a peak specific surface area of 93.01 m2/g, strong dye adsorption capacity, small interfacial resistance, and fast electron transfer rate. These outstanding properties significantly promoted the generation of photoelectrons and improved the photoelectric conversion efficiency of DSSC. Compared with single-component TiO2, the photoelectric conversion efficiency of SnO2–TiO2 nanofiber photoanode composite material improved by 85.65%.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 45
·期 5
·2631-2642
·
IF 3.288
Wei Hong,Chengcai Li,Tao Tang,Huan Xu,Yuan Yu,Guojin Liu,Feng Wang,Caihong Lei,Hailin Zhu
The immobilization of photocatalysts is considered an effective approach to solve the problem of the difficult recycling of powdered nanocatalysts after photocatalytic degradation. In this paper, tin dioxide/titanium dioxide (SnO2/TiO2) composite nanoparticles with excellent photodegradation performance and poly(vinylidene fluoride) (PVDF) resin were used as raw materials to prepare composite membranes for the catalytic degradation of rhodamine B (RhB) dye via a non-solvent-induced phase separation method. Specifically, the basic properties of SnO2/TiO2 composite nanoparticles were systematically analyzed, the photocatalytic performance of SnO2/TiO2/PVDF composite membranes was thoroughly investigated, and the photocatalytic mechanism has been revealed. Experimental results showed that the SnO2/TiO2 composite photocatalyst demonstrates a higher photocatalytic activity than the single photocatalyst with the SnO2/TiO2 composite comprising Sn/Ti in a molar ratio of 1 : 6, showing the highest photocatalytic performance. After SnO2/TiO2 composite particles were used as a kind of raw material for the production of PVDF membrane, the photocatalytic degradation rate of RhB by the SnO2/TiO2/PVDF composite membrane was as high as 91.84%. Moreover, ˙OH and h+ play a very important role in the whole photocatalytic degradation process. In summary, this paper will provide an effective guidance to improve the photocatalytic degradation of SnO2/TiO2/PVDF composite membranes, which will ultimately provide a broad potential application of photocatalysis in the field of water treatment.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Weining Liu,Xi Tan,Mingyang Zhao,Zhao Liu,Hairong Li
Triethylamine (TEA) is a highly toxic and flammable volatile organic compound (VOC) that poses serious risks to both human health and environmental safety. Thus, the development of highly sensitive gas sensors for its trace-level detection is of pressing importance. In this work, SnO 2 /TiO 2 heterostructures were synthesized via an in-situ thermal transformation of Sn-MOF/MXene precursors. The derived materials benefit from the inherent high porosity and large specific surface area of MOF-based frameworks, as well as the tightly coupled heterointerface formed under the modulation of MXene, efficiently facilitating charge separation and transport, while TEA interacts more readily with active sites due to the richness of surface defects, thereby greatly boosting TEA adsorption and sensing response. The optimized MST-2 sensor exhibits an ultrahigh response of 3525.2 to 10 ppm TEA at a notably low operating temperature of 61 °C, along with excellent selectivity and good stability. Even at an ultralow TEA concentration of 10 ppb, the sensor maintains a strong response of 44.6. Furthermore, the adsorption characteristics of individual phases, interfacial charge transfer processes, and TEA adsorption enhanced mechanisms were systematically examined through density functional theory (DFT) calculations. The effective MOF/MXene-derived co-construction strategy offers a promising avenue for designing advanced TEA sensing materials.
研究领域:
材料科学
·
纳米技术
·
传感器
·
化学工程
·
环境科学
✓ 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）