SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Wenlong Zhang,Bin Yang,Jingquan Liu,Xiang Chen,Xiaolin Wang,Chunsheng Yang
In order to improve the sensitivity and reduce working temperature of tin oxide sensor, two elements of copper, zinc doped tin oxide gas sensor has been successfully synthesized using one-step hydrothermal method. During the preparation process, the common zinc acetate and cupric chloride were adopted as copper, zinc source, respectively. The morphology and structure of the as-prepared sample were further characterized using X-ray diffraction (XRD), energy dispersive spectrometry (EDS), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HR-TEM), selected area electron diffraction (SAED), and ASAP 2460 (used for mesoporous distribution analysis). It’s found that octahedral nanoparticle enclosed by (221) high energy crystal facet had been prepared. The results also demonstrated that the as-prepared tin oxide doped by copper, zinc elements was single crystal structure of tetragonal system and the size of the crystalline grain was about 50 nm. During the gas sensing performance experiments, the sample’s gas-sensing properties have been proved to be greatly enhanced in sensitivity and working temperature. The response value to 50 ppm ethanol at 110 °C of the sample was increased to 210 that was almost 10 times higher than reported values. Besides, the optimal working temperature was decreased to be 110 °C from reported 350 °C.
研究领域:
材料科学
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纳米技术
·
气体传感
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Sarula Li,Zheyan Hu,Tianqi Wang,Fang Song,Hong Shao,Feng Li,Xiangting Dong
Triethylamine (TEA) gas is a kind of toxic gas that can lead to health problems. In this work, a novel Janus structure nanofibers (NFs) have been synthesized via a parallel electrospinning method. SnO 2 and In 2 O 3 are selected as the components of the Janus structure and different ratios of SnO 2 and In 2 O 3 in Janus structure are regulated. To investigate its TEA sensing application, gas sensors have been fabricated and the concentration of TEA gas is set at 20 ppm. The gas sensing results indicate that the optimum ratio of SnO 2 to In 2 O 3 is 1:1 and the gas sensors exhibit good sensing performances including a good response (8.45), short response time (4 s), high signal-to-noise ratio (4.45) and stable reproducibility. The improved gas sensing performances can be attributed to the n-n type Janus heterostructure interface. This research may make contributions to the development of semiconductor heterostructure sensing materials and gas 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
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
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 7
·期 4
·1878-1888
·
IF 9.931
Yu Zhou,Sisi Yang,Xuewen Yin,Jianhua Han,Meiqian Tai,Xingyue Zhao,Hui Chen,Youchen Gu,Ning Wang,Hong Lin
Recent advances in flexible perovskite solar cells (PSCs) have attracted considerable attention owing to their great potential for bendable and wearable electronic devices. In particular, developing high-quality low-temperature processed electron transport layers (ETLs) plays a pivotal role in realizing highly efficient flexible PSCs. Herein, we develop a facile strategy to fabricate graphene quantum dot/SnO2 composites (G@SnO2) as effective ETLs. Systematic optimization and investigation reveal that SnO2 blended with graphene quantum dots with ca. 5 nm diameter (G5@SnO2) has higher electron mobility, better film coverage and better energy level alignment compared to pristine SnO2, leading to promoted charge transfer and suppressed charge recombination. PSCs based on G5@SnO2 demonstrate superior photovoltaic performance with a champion power conversion efficiency (PCE) of 19.6% and average PCE of 19.0%. Amazingly, the G5@SnO2 based flexible PSCs obtain a best PCE and stabilized PCE of 17.7% and 17.2%, respectively, comparable to the highest PCEs recorded for flexible devices. Moreover, our flexible PSCs demonstrate outstanding mechanical durability, retaining over 91% of the initial PCE value after 500 bending cycles with a bending radius of 7 mm.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2019
·Vol. 25
·期 1
·35
·
IF 3.06
Kechuang Wan,Jialin Yang,Ding Wang,Xianying Wang
In this work, we reported a formaldehyde (HCHO) gas sensor with highly sensitive and selective gas-sensing performance at low operating temperature based on graphene oxide (GO)@SnO2nanofiber/nanosheets (NF/NSs) nanocomposites. Hierarchical SnO2NF/NSs coated with GO nanosheets showed enhanced sensing performance for HCHO gas, especially at low operating temperature. A series of characterization methods, including X-ray diffraction (XRD), Field emission scanning electron microscopy (FE-SEM), Transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS) and Brunauer–Emmett–Teller (BET) were used to characterize their microstructures, morphologies, compositions, surface areas and so on. The sensing performance of GO@SnO2NF/NSs nanocomposites was optimized by adjusting the loading amount of GO ranging from 0.25% to 1.25%. The results showed the optimum loading amount of 1% GO in GO@SnO2NF/NSs nanocomposites not only exhibited the highest sensitivity value (Ra/Rg= 280 to 100 ppm HCHO gas) but also lowered the optimum operation temperature from 120 °C to 60 °C. The response value was about 4.5 times higher than that of pure hierarchical SnO2NF/NSs (Ra/Rg= 64 to 100 ppm). GO@SnO2NF/NSs nanocomposites showed lower detection limit down to 0.25 ppm HCHO and excellent selectivity against interfering gases (ethanol (C2H5OH), acetone (CH3COCH3), methanol (CH3OH), ammonia (NH3), methylbenzene (C7H8), benzene (C6H6) and water (H2O)). The enhanced sensing performance for HCHO was mainly ascribed to the high specific surface area, suitable electron transfer channels and the synergistic effect of the SnO2NF/NSs and GO nanosheets network.Keywords:GO@SnO2NF/NSs;nanocomposites;formaldehyde gas sensors;three-dimensional nanostructure
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 11
·期 2
·901-913
·
IF 14.511
Yapeng Sun,Jiankai Zhang,Huangzhong Yu
In the last two years, studies on SnO2 preparation and optimization have proved to be effective paths toward the Schottky limit of perovskite solar cells. Herein, we used an electrochemical deposition method to obtain polycrystalline SnO2 film at room temperature for the first time. The method has the advantage of simplicity and efficiency using electrochemistry to realize deposition, adsorption, and protection of the SnO2 film, avoiding a more complex regulation process than the chemical bath deposition method. Benefiting from the optimization process, the method could achieve adjustable work function of the SnO2 film by controlling the pH of the electrolyte, which is conducive for reducing mismatched energy levels between the SnO2 film and the perovskite layer. Besides, the obtained SnO2 film is densely and uniformly distributed along the substrate profile, leading to better light transmission. More importantly, this method can be applied to prepare SnO2 film on large area and flexible substrates. Finally, the device based on SnO2 film prepared with pH = 1 electrolyte achieves the highest performance of 22.85%, which is higher than that of the device based on the commercial colloidal dispersion SnO2 film (21.72%). These multi-advantages of the method make it competitive for future commercialization.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 37
·17767-17775
·
IF 3.925
Ji-Ping Jia,Yu-Lu Zhang,Jin-Yu Gou,Yi-Xuan Zhang,Yu-Ke Dai,Hong-Hua Ge,Yu-Zeng Zhao,Xin-Jing Meng
A Ti/SnO2–Sb–Cu–Zn electrode was prepared for the electrocatalytic oxidation of Acid Red 18 (AR18). The addition of Zn to the coating results in smaller surface cracks and greater roughness. When Cu and Zn coexist, high-index crystal planes are generated on smaller-sized grains formed on the coating surface, which allows the coating surface to adsorb oxygen. Sb5+ and the adjacent Cu2+–Zn2+ on the surface of the Cu–Zn co-doped coating are the advantageous active sites for adsorbed oxygen. The electrode exhibits a larger electrochemically active surface area and smaller electrochemical reaction resistance. The appearance of high-index crystal planes is beneficial to improve the electrocatalytic activity of the electrode, although the oxygen evolution potential of the electrode is not greatly improved. Cu–Zn co-doping produces synergistic mineralisation and enhances the ability to degrade AR18, and ˙OH is the main active species. During the thermal decomposition of the coating, Zn induces Cu to form more active sites on the high-index crystal planes of SnO2, a phenomenon that may be responsible for the synergistic production of more reactive oxygen species on the electrode surface.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMPHYSCHEM
·
2012
·Vol. 13
·期 17
·3932-3936
·
IF 3.412
Li Jiang,Penggang Yin,Tingting You,Hua Wang,Xiufeng Lang,Lin Guo,Shihe Yang
Graphical SERS substrates: The surface-enhanced Raman spectra (SERS) obtained on SnO 2 show good spatial uniformity and reproducibility. A time-dependent DFT study indicates that the SERS signal originates from a charge-transfer transition process. Highly reproducible surface-enhanced Raman scattering (SERS) spectra are obtained on the surface of SnO 2 octahedral nanoparticles. The spot-to-spot SERS signals show a relative standard deviation (RSD) consistently below 20 % in the intensity of the main Raman peaks of 4-mercaptobenzoic acid (4-MBA) and 4-nitrobenzenethiol (4-NBT), indicating good spatial uniformity and reproducibility. The SERS signals are believed to mainly originate from a charge-transfer (CT) mechanism. Time-dependent density functional theory (TD-DFT) is used to simulate the SERS spectrum and interpret the chemical enhancement mechanism in the experiment. The research extends the application of SERS and also establishes a new uniform SERS substrate.
研究领域:
材料科学
·
光谱学
·
理论化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Fei Fei,Yunxiao Liao,Yibo Xu,Shubo Wang,Lvzhou Li,Xu Dong,Xiaoshuang Zhou,Jie Gao,Kaifeng Wang,Ningyi Yuan,Jianning Ding
Perovskite solar cells (PSCs) have shown great potential for reducing costs and improving power conversion efficiency (PCE). One effective method to achieve the latter is to use an all-inorganic charge transport layer (ICTL). However, traditional methods for crystallizing inorganic layers often result in the formation of a powder instead of a continuous film. To address this issue, we designed a dual-layer inorganic electron transport layer (IETL). This dual-layer structure consists of a layer of SnO2 nanocrystals (SnO2 NCs) deposited via a solution process and a dense SnO2 layer deposited through atomic layer deposition (ALD SnO2) to fill the cracks and gaps between the SnO2 NCs. PSCs having these dual-layer SnO2 ETLs achieved a high efficiency of 23.0%. This efficiency surpasses the recorded performance of ICTLs deposited on the perovskite. Furthermore, the PCE is comparable to that achieved with a C60 ETL. Moreover, the high-density structure of the ALD SnO2 layer inhibits the vertical migration of ions, resulting in improved thermal stability. After continuous heating at 85 °C in 10% humidity for 1000 h, the PCE of the dual-layer SnO2 structure decreased by 18%, whereas that of the C60/BCP structure decreased by 36%. The integration of dual-layer SnO2 into PSCs represents a significant advancement in achieving high-performance, commercially viable inverted monolithic PSCs or tandem solar cells.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
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
COMPOSITES PART B-ENGINEERING
·
2021
·
IF 9.078
Hewei Zhao,Xiaolong Zeng,Tian Zheng,Shaojia Liu,Jie Yang,Rui Hao,Fengshi Li,Lin Guo
High capacity, ultra-fast charge/discharge rate, and long cycling life are external targets for Lithium-ion batteries (LIBs) to satisfy modern energy storage, but it is still challenging to realize them simultaneously. Here, we report a three-dimensional (3D) porous rGO@SnO 2 nanosheets aerogel (rGO@SnO 2 NSA) based on in-situ growing two-dimensional (2D) SnO 2 nanosheets on graphene oxide (GO@SnO 2 NS), subsequent controllable assembly and reduction. The 2D structure of SnO 2 can shorten the electron-transfer path, and the porous architecture of the 3D aerogel endows the aerogels with external ion-transfer channels and exceptional capacitive contribution. As a result, the LIBs using our 3D aerogels as anodes can endure ultrafast charge/discharge (10 A g −1 ) rate and exhibit ultra-long cycling life with a high energy density (512.1 mAh g −1 after 10,000 cycles). For application exploration, the LiFePO 4 /rGO@SnO 2 NSA cell also possesses excellent energy storage performance (364.5 mAh g −1 after 100 cycles). Our electrode design strategy of combining 2D active materials and 3D porous architecture provides a new path to develop next-generation rechargeable energy storage devices.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2013
·Vol. 2
·期 10
·3461-3467
·
IF 0
Hongyan Li,Shiyu Gan,Dongxue Han,Weiguang Ma,Bin Cai,Wei Zhang,Qixian Zhang,Li Niu
Promotion of the catalytic efficiency and reduction of the usage amount of Pd are crucial to developing effective and low-cost catalysts for catalytic reduction of organic aromatic nitro pollutant compound at present. Herein, we report a hybrid material of ultrafine Pd nanocrystals (PdNCs) grown on an excellent support of SnO2-decorated graphene nanosheets (SnO2-GNS) for a highly efficient reduction of a representative aromatic nitro compound (4-nitrophenol). The supporting material of SnO2-GNS was prepared simply by one step of homogeneous reaction with a positively charged polymer as stabilizer and active site for absorption of the PdNCs precursor. Transmittance electronic images demonstrate that the PdNCs are densely and well covered on the SnO2-GNS with a uniform size of 3.4 nm. This nanohybrid exhibits the fastest reduction time (4 minutes) compared to other controlled materials. Moreover, it shows high kinetic responses with an apparent kinetic rate constant (kapp) of 2.03 × 10−2 s−1 and turnover frequency (TOF) of 1.70 s−1. The cycle performance (10 times) experiments demonstrate that this nanohybrid also displays a good anti-poisoning capability. Thanks to the ultrafine PdNCs, this as-prepared PdNCs/SnO2-GNS nanohybrid may have broad potential in other catalytic fields, for example, organic synthesis, fuel cells and electrochemical biosensors.
研究领域:
材料科学
·
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
危险品化学品经营许可证（带存储）