Polymers
·
2022
·Vol. 14
·期 7
·1494
·
IF 4.967
Yingna Zhang,Feng Dou,Yijia Zhou,Xiaofeng Zhao,Jiangshan Chen,Cheng Wang,Shuhong Wang
In this paper, a D–A polymer (PIB) containing carbazole as the donor group in the main chain and benzimidazole benzisoindolinone as the acceptor group was synthesized by Suzuki reaction. The Suzuki reaction, also known as the Suzuki coupling reaction, is a relatively new organic coupling reaction in which aryl or alkenyl boronic acids or boronic acid esters react with chlorine, bromine, iodoaromatic hydrocarbons or alkenes under the catalysis of zerovalent palladium complexes cross-coupling. A series of devices were fabricated by a spin-coating approach, and the devices all exhibited ternary resistance switching storage behavior. Among them, the composite device with the mass fraction of SnO2NPs of 5 wt% has the best storage performance, with a threshold voltage of −0.4 V and a switching current ratio of 1:101.5:104.5. At the same time, the current of the device remained stable after a 3-h test. Furthermore, after 103cycles, the current has no obvious attenuation. The device has good stability and continuity. Moreover, the conduction mechanism is further revealed. Inorganic nanoparticle composite devices have splendid memory performances and exhibit underlying application significance in storing data.Keywords:ternary memory device;tin dioxide nanoparticle;switching current ratio
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
PubMed
高影响因子
SENSORS
·
2021
·Vol. 22
·期 1
·293
·
IF 3.576
Fan Li,Peng Li,Hongyan Zhang
A high-performance zinc oxide/tin dioxide (ZnO/SnO2) humidity sensor was developed using a simple solvothermal method. The sensing mechanism of the ZnO/SnO2humidity sensor was evaluated by analyzing its complex impedance spectra. The experimental results prove that the ZnO/SnO2composite material has a larger specific surface area than pure SnO2, which allows the composite material surface to adsorb more water to enhance the response of the ZnO/SnO2humidity sensor. ZnO can also contribute to the generation of oxygen-rich vacancies on the ZnO/SnO2composite material surface, allowing it to adsorb a large amount of water and rapidly decompose water molecules into conductive ions to increase the response and recovery speed of the ZnO/SnO2humidity sensor. These characteristics allowed the Z/S-2 humidity sensor to achieve a higher response (1,225,361%), better linearity, smaller hysteresis (6.6%), faster response and recovery speeds (35 and 8 s, respectively), and long-term stability at 11–95% relative humidity. The successful preparation of the ZnO/SnO2composite material also provides a new direction for the design of SnO2-based resistance sensors with high humidity-sensing performance.Keywords:zinc oxide/tin dioxide;specific surface area;oxygen vacancy;high response;humidity sensor
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Chemistry Frontiers
·
2021
·Vol. 5
·期 23
·8238-8247
·
IF 6.482
Wenhao Chi,Zhaoyong Zou,Wenxuan Wang,Fuqiang Wan,Hang Ping,Jingjing Xie,Weimin Wang,Zhengyi Fu
A living organism is a complex “biosynthesis factory” for the fabrication of materials under environmentally benign conditions, which is worth studying to extend synthesis techniques. Inspired by the formation process of pearls, living mussels have been used to direct the formation of nitrogen-doped anatase TiO2. Here, instead of only synthesizing single-phase materials, we extend the technique for the fabrication of a SnO2/graphene oxide composite. The tin chloride hydroxide hydrate precursor transforms into SnO2 nanocrystals in situ on the surface of graphene oxide with good dispersion and high load to form a homogeneous microstructure under the direction of mussels at ambient temperature. The SnO2/graphene oxide composite exhibits improved lithium storage performance as the anode of a lithium-ion battery. A stable reversible capacity can be achieved, which is up to 1099 mA h g−1 after 100 cycles at a current density of 100 mA g−1. This study demonstrates the possibility and practicability of synthesizing anthropogenically useful composite materials in living organisms, which is advantageous to extend synthesis methods and reduce energy consumption.
研究领域:
材料科学
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生物学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Solar RRL
·
2023
·Vol. 7
·期 23
·2300554
·
IF 7.9
Yanqi Ren,Bowen Li,Ying Zhu,Zhihao Zhang,Qi Luo,Hongxin Weng,Xin Tan,Peng Xiang,Xinyu Tan
Perovskite solar cells have rapidly developed into the standard representative of the third generation of photovoltaic power generation due to their low energy consumption and low cost. This device faces many challenges in achieving higher efficiency and better long-term stability. The core issue is the passivation of various defects and appropriate energy-level matching. Herein, the use of potassium pentaminodifluorobenzoate (KAFA) not only improves the light transmittance of SnO 2 /ITO, but also passivates the interface defects of SnO 2 /perovskite by introducing amino, carboxyl, fluorine, and potassium ions. This allows the device to form a suitable energy-level arrangement, thereby greatly improving the performance of perovskite solar cells. Compared with 20.36% of the pristine device, the KAFA-SnO 2 -based device achieves a champion power conversion efficiency of 22.46%, with an increase in short-circuit current from 23.94 to 24.78 mA cm −2 and open-circuit voltage from 1.149 to 1.169 V. After 120 h of continuous illumination with standard sunlight under N 2 atmosphere, its initial efficiency is still as high as 88.8%, showing excellent stability.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Xiaodong Ren,Dong Yang,Zhou Yang,Jiangshan Feng,Xuejie Zhu,Jinzhi Niu,Yucheng Liu,Wangen Zhao,Shengzhong Frank Liu
Electron transport layer (ETL), facilitating charge carrier separation and electron extraction, is a key component in planar perovskite solar cells (PSCs). We developed an effective ETL using low-temperature solution-processed Nb-doped SnO2 (Nb:SnO2). Compared to the pristine SnO2, the power conversion efficiency of PSCs based on Nb:SnO2 ETL is raised to 17.57% from 15.13%. The splendid performance is attributed to the excellent optical and electronic properties of the Nb:SnO2 material, such as smooth surface, high electron mobility, appropriate electrical conductivity, therefore making a better growth platform for a high quality perovskite absorber layer. Experimental analyses reveal that the Nb:SnO2 ETL significantly enhances the electron extraction and effectively suppresses charge recombination, leading to improved solar cell performance.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2019
·
IF 7.149
Yan Zhang,Jinhua Li,Jing Bai,Linsen Li,Shuai Chen,Tingsheng Zhou,Jiachen Wang,Ligang Xia,Qunjie Xu,Baoxue Zhou
The conversion of excess ammonia N into harmless N2 is a primary challenge for wastewater treatment. We present here a method to generate ClO• directionally for quick and efficient decomposition of NH4+ N to N2. ClO• was produced and enhanced by a bifacial anode, a front WO3 photoanode and a rear Sb–SnO2 anode, in which HO• generated on WO3 reacts with HClO generated on Sb–SnO2 to form ClO•. Results show that the ammonia decomposition rate of Sb–SnO2/WO3 is 4.4 times than that of WO3 and 3.3 times than that of Sb–SnO2, with achievement of the removal of NH4+ N on Sb–SnO2/WO3 and WO3 being 99.2 and 58.3% in 90 min, respectively. This enhancement is attributed to the high rate constant of ClO• with NH4+ N, which is 2.8 and 34.8 times than those of Cl• and HO•, respectively. The steady-state concentration of ClO• (2.5 × 10–13 M) is 102 times those of HO• and Cl•, and this is further confirmed by kinetic simulations. In combination with the Pd–Cu/NF cathode to form a denitrification exhaustion system, Sb–SnO2/WO3 shows excellent total nitrogen removal (98.4%), which is more effective than WO3 (47.1%) in 90 min. This study provides new insight on the directed ClO• generation and its application on ammonia wastewater treatment.
研究领域:
环境科学
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化学工程
·
水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Kanglu chang,Xiaowen kong,Yining Zhang,Xumei Tao,Liang Huang
Photo-assisted thermo-catalytic conversion of glucose to 5-hydroxymethylfurfural (HMF) is one of the most promising ways for channeling solar energy. Photo-assisted thermo-catalytic conversion of glucose and HMF yield were improved with SnO 2 /Cr-MOFs/Cr(OH) 3 catalysts under visible light irradiation at 135 ℃-165 ℃ nitrogen atmosphere. SnO 2 /Cr-MOFs/Cr(OH) 3 afforded relatively high Lewis acidity and Brønsted acidity, which was beneficial for thermo-catalytic conversion of glucose. The light and the interface between SnO 2 and Cr-MOFs/Cr(OH) 3 assistantly promoted the HMF formation. The photo-generated holes (h + ) under light irradiation was the driving force for the formation of “free” protons from water and carboxylic acid in Cr-MOFs, which acted as Brønsted acid sites to promote HMF formation. With 576 mg glucose as the substrate and DMSO as the solvent, 92 % glucose conversion with 43.2 % HMF yield was achieved at 150 ℃ for 2 h under nitrogen atmosphere and 500 W Xe lamp irradiation. The results demonstrate the promise of photo-assisted thermo-catalytic conversion of glucose in the future.
研究领域:
化学工程
·
纳米材料科学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2021
·Vol. 12
·期 1
·1-9
·
IF 14.919
Wang Xiu-man,Tao Lu-qi,Yuan Min,Wang Ze-ping,Yu Jiabing,Xie Dingli,Luo Feng,Chen Xianping,Wong ChingPing
Sensitivity and pressure range are two significant parameters of pressure sensors. Existing pressure sensors have difficulty achieving both high sensitivity and a wide pressure range. Therefore, we propose a new pressure sensor with a ternary nanocomposite Fe 2 O 3 /C@SnO 2 . The sea urchin-like Fe 2 O 3 structure promotes signal transduction and protects Fe 2 O 3 needles from mechanical breaking, while the acetylene carbon black improves the conductivity of Fe 2 O 3 . Moreover, one part of the SnO 2 nanoparticles adheres to the surfaces of Fe 2 O 3 needles and forms Fe 2 O 3 /SnO 2 heterostructures, while its other part disperses into the carbon layer to form SnO 2 @C structure. Collectively, the synergistic effects of the three structures (Fe 2 O 3 /C, Fe 2 O 3 /SnO 2 and SnO 2 @C) improves on the limited pressure response range of a single structure. The experimental results demonstrate that the Fe 2 O 3 /C@SnO 2 pressure sensor exhibits high sensitivity (680 kPa −1 ), fast response (10 ms), broad range (up to 150 kPa), and good reproducibility (over 3500 cycles under a pressure of 110 kPa), implying that the new pressure sensor has wide application prospects especially in wearable electronic devices and health monitoring.
研究领域:
材料科学
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电子工程
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纳米技术
✓ 已验证
DOI
高影响因子
Advanced Materials Interfaces
·
2022
·Vol. 9
·期 6
·2102331
·
IF 6.389
Beibei Zong,Jianguo Deng,Qing Sun,Zizhao Zhang,Xiangxin Meng,Bo Shen,Bonan Kang,S. Ravi P. Silva,Geyu Lu
After perovskite became a star material, research on perovskite solar cells (PSCs) became a hot topic and developed rapidly. Electron transport layers (ETLs) with high mobility, low-defect state, and suitable energy level arrangement dominate the development of planar heterojunction PSCs. In this work, the K + and Cs + doped composite SnO 2 ETL ( x mg KC-SnO 2 ) by a continuous spin-coating of the x mg Cs + @KOH and SnO 2 aqueous solution shows a substantial improvement in carries extraction, transport and collection properties, leading to the increased fill factor (FF) from 72.48% to 81.00% of the planar heterojunction PSCs, and finally the champion device average efficiency is 21.62%. Moreover, this work improves the interface contacts between ETL/Perovskite, as it reduces energy disorder and simultaneously promotes electron transport, charge extraction at the interface, improve energy level alignment and quasi-Fermi level splitting, and decreased resistance for charge transfer in the device. In conclusion, this simple and effective method of improving the FF value provides a certain shortcut to the performance of plane heterogeneous perovskite devices.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Yawen Cai,Yifeng Zhang,Zhimin Lv,Shuo Zhang,Feixue Gao,Ming Fang,Mingguang Kong,Peisheng Liu,Xiaoli Tan,Baowei Hu,Xiangke Wang
In this work, a highly efficient uranium extraction method from water by the piezo catalytic reduction-oxidation process is reported by utilizing a hollow cubic shaped Zn 2 SnO 4 /SnO 2 as piezo catalyst. The electrons and holes in Zn 2 SnO 4 /SnO 2 are separated efficiently under the irradiation of ultrasound. After that, some of the piezo electrons reduce the adsorbed U(VI) to UO 2 , the others react with soluble oxygen to form H 2 O 2 , and oxidize UO 2 to generate (UO 2 )O 2 ∙2H 2 O, which could be efficiently separated from the solution. U(VI) piezo catalytic extraction rate could reach ~ 90% under the irradiation of ultrasonic waves (40 kHz, 120 W) within 5 h and only decreased by ~ 3% after four cycles. The present work advances piezo catalysis as a new route for uranium extraction from water, which may be applied in the extraction or removal of U(VI) in the U-containing wastewaters, providing new opportunities for resource-saving and environmental enhancement.
研究领域:
环境科学
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材料科学
·
核工程
✓ 已验证
产品关联
DOI
高影响因子
COMBUSTION SCIENCE AND TECHNOLOGY
·
2025
·
IF 1.5
Baichen Chen,Yi Wang,Jianchen He,Xiaolan Song,Chongwei An
This article uses a combination of experimental and simulation methods for mutual verification to explore the possibility of nano aluminum thermite damaging chips and disrupting circuit systems. In terms of experiments, Fe2O3/SiO2/Al and SnO2/SiO2/Al aluminum thermites were prepared by physically mixing micro Al powder, nano SiO2, and nano metal oxide powder in a certain proportion. The binder was added and pressed into a charge column for ignition testing. The prepared aluminum thermite was characterized and its performance was tested using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy(XPS), and constant pressure combustion experiments.In terms of molecular dynamics simulation, Materials Studio software was used to investigate the interaction relationships between atoms in the aluminum thermite. The reaction process and properties of the aluminum thermite under adiabatic conditions at different initial temperatures were explored from the perspectives of potential energy, radial distribution function, mean square displacement, and self diffusion coefficient. The simulation results were compared with experimental reaction phenomena. The results show that the aluminum thermite prepared by physical method is uniformly mixed, various materials are fully adhered, well dispersed, and there is no agglomeration phenomenon. In terms of combustion performance, the overall performance of Fe2O3/SiO2/Al thermite is better than that of SnO2/SiO2/Al thermite, with higher combustion efficiency, higher reaction temperature, and the ability to maintain high temperature for a longer period of time. The combustion of Fe2O3/SiO2/Al aluminum thermite is more complete, and the reaction generates more elemental Si, which plays a positive role in the damage of chips. In terms of molecular dynamics simulation, the aluminum thermal reaction of Fe2O3/SiO2/Al at different initial temperatures is more stable, with a faster energy release rate and a higher total energy content than SnO2/SiO2/Al. The aluminum thermal reaction generates oxides of elemental Fe/Sn, Si, and Al. Overall, the diffusion coefficients of both aluminum thermites increase with the increase of initial temperature, and the intensity of the reaction also increases with the increase of initial temperature. Temperature has an accelerating effect on their diffusion, and SnO2/SiO2/Al has stronger diffusion ability than Fe2O3/SiO2/Al. The Fe2O3/SiO2/Al aluminum thermite has a better damage effect on chips, and the simulation and experimental results are consistent.
研究领域:
材料科学
·
计算化学
·
工程学
✓ 已验证
产品关联
DOI
高影响因子
Analysis & Sensing
·
2024
·
IF 3.4
Yifeng Xu,Haixia Mei,Yu Bing,Fuyun Zhang,Ning Sui,Tingting Zhou,Xiaopeng Fan,Lijie Wang,Tong Zhang
Graphical In this article, a Sm−Pd bimetal doped SnO 2 -based MEMS C 2 H 2 sensor was prepared for detecting dissolved acetylene gas in transformer oil. It has the unique advantages of high sensitivity, high selectivity and low power consumption. Acetylene (C 2 H 2 ), as an important characteristic gas in transformer fault diagnosis, should be accurately detected and effectively distinguished from other dissolved gases (H 2 , CH 4 , C 2 H 6 , C 2 H 4 , CO, CO 2 ), which is crucial to determine whether the fault occurs and the fault type, but also faces challenges now. The rational design and employment of rare earth and noble metals are expected to address this issue. In this work, SnO 2 -3 at% Sm 2 O 3 -1 at% PdO based MEMS gas sensor was prepared to achieve high performance detection of C 2 H 2 which has a response value of 56 to 50 ppm C 2 H 2 , response/recovery time of 2 s/136 s, lower detection limit of 1 ppm, power consumption of 15.5 mW, and weak cross sensitivity to other transformer fault characteristic gases. Lewis acids and bases theory was used to explain the reason why rare earth Sm is a benefit element to improve selectivity to C 2 H 2 . The formation of oxygen vacancies and hetero junctions was used to explain the increased sensitivity of the material. This study proved the feasibility of rare earth and noble metals as potential additives to enable advanced gas-sensitive materials for highly selective transformer fault characteristic gas C 2 H 2 detection.
研究领域:
材料科学
·
传感器技术
·
电力设备监测
✓ 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）