SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Zheyan Hu,Sarula Li,Feng Li,Tianqi Wang,Hong Shao,Xiangting Dong
Herein, ZnO-SnO 2 Janus nanofibers (NFs) were synthesized by a parallel electrospinning method and its sensing performances were tested. Considering the compositions of the two metal oxide semiconductors in Janus structure, different ratios of ZnO and SnO 2 were designed and controlled. The optimum ratios of ZnO and SnO 2 was 1:2 by analyzing their sensing performances to triethylamine (TEA) gas. Gas sensors based on ZS-12 Janus NFs exhibited a high response to TEA (45.2) and an excellent sensing response/recovery reproducibility. In order to investigate the sensing mechanism of Janus structure, ZnO NFs and SnO 2 NFs were synthesized and used as controlled experiment. The results indicated that the heterostructures in Janus NFs is the key factor for the enhanced TEA sensing performances. The electrons flowed in the ZnO-SnO 2 Janus structure leading to the variation of ionic oxygen species and electron depletion layer. These phenomena improved the reaction of TEA gas molecules with ionic oxygen species so that the TEA sensing performances were enhanced. Based on the Janus structures, a satisfactory gas sensor for detecting TEA gas were developed. Significantly, this work investigated the sensing mechanism of Janus structures and provided an efficient strategy for the gas sensing materials.
研究领域:
材料科学
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传感器技术
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Lu Jing,Weili Li,Chang Gao,Weidong Fei
Polymer-based dielectrics trigger great interests in advanced electric systems due to their high breakdown strength and power density. However, a major drawback is that excessive addition of high- ε r ceramic nanofillers may deteriorate their breakdown strength and further reduce energy density. Herein, a general strategy is provided to dramatically enhance the breakdown strength by introducing a small amount of core–shell structured Al 2 O 3 @BiFeO 3 nanofibers into PVDF/PMMA polymer matrix. The thickness of BiFeO 3 shell is regulated by controlling its molar concentration. A significantly enhanced breakdown strength (759 kV mm −1 ) and an ultrahigh energy density (22.7 J cm −3 ) with an energy efficiency of 72% are observed. The greatly improved breakdown strength is ascribed to the regulation of electron depletion layer. When the width of heterojunction region gradually approaches to the scale of electron depletion layer, more annihilation of electrons happens and thus contributes to the enhancement of the breakdown strength. The results suggest that our designed structure can help to address the issue of both enhancing the breakdown strength and energy density for diverse nanocomposites over a broad application.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2019
·
IF 6.35
Yongjie Wang,Yingyan Jiang,Wei Wang
Surface plasmon resonance (SPR) is one of the most popular and powerful techniques for label-free detecting and quantitatively analyzing the interfacial refractive index (RI). So far, most of the SPR measurements are mainly applied to detect the relative change of RI upon biological and chemical events occurring at the interface, while the determinations on the absolute value of RI remains challenging. However, the absolute value of RI has become increasingly urgent in some cases, such as the existence and physical properties of the water depletion layer (WDL). WDL refers to a subnanometer-thick layer with reduced density between water and the hydrophobic substrate. The detailed explanations of how water meets hydrophobic surface have been studied by several kinds of techniques for decades but it remains under debate. In this work, we successfully established a method to measure the absolute RI at a gold–liquid interface by surface plasmon resonance microscopy (SPRM) and 2D Fourier transformation image processing and further applied this method to study the existence and physical nature of WDL. It was found that a 0.6 nm thick WDL existed at the interface of water and the hydrophobic substrate, leading to a reduced refractive index of 1.3295 ± 0.0006 compared with the standard value of 1.3325. Our results further indicated that the WDL consisted of a uniform layer rather than numerous isolated surface nanobubbles that distributed at the interface with high density.
研究领域:
物理化学
·
界面科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Donghui Li,Dan Han,Yi Chen,Zhihua Liu,Xiaoru Liu,Lulu Liu,Xiaomei Han,Xiuli He,Shengbo Sang
Accurate detection of NO 2 gas with low concentration and high stability is of great significance to ecological protection and human health. In this work, hollow porous GaN nanofibers were fabricated by a low-cost solvothermal method and controlled nitridation process. Systematic characterizations results demonstrate large specific surface and abundant adsorpation sites of the GaN nanofibers. Excellent NO 2 sensing performances were tested at 200 °C, including the high sensitivity of 22.9 (200 ppm), rapid response time within 11 s, high selectivity, and low detection limit (0.5 ppb). Furthermore, the anti-interference ability, cross-sensitivity characteristics, and long-term stability of the sensor in the actual working environment were also systematically investigated. The surface depletion layer model and the change of the potential barrier were used to explain the enhanced gas-sensing performance. The fabricated GaN sensor offered a promising candidate for real-time monitoring of sub-ppb-level NO 2 gas in actual environments.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Chen Wang,Yinglin Wang,Pengfei Cheng,Luping Xu,Fan Dang,Tianliang Wang,Zhaohui Lei
A highly sensitive and selective acetone gas sensor has been fabricated successfully by designing n-n heterojunction consisting of TiO 2 nanorods and α -Fe 2 O 3 branches. The structure and morphology of the TiO 2 / α -Fe 2 O 3 nanocomposites were examined via X-ray diffraction and scanning electron microscopy, respectively. TiO 2 nanorod (with the diameter about 42 nm) arrays were in-situ generated on the surface of Al 2 O 3 ceramic tubes by a simple hydrothermal process. In addition, α -Fe 2 O 3 branches grew on TiO 2 stems successfully in the second hydrothermal process. These nanorod branches had a relatively uniform length, which could be tunable by changing the concentration of iron precursor. The gas sensing properties of the pristine and α -Fe 2 O 3 branches-decorated TiO 2 nanorods sensors with regard to acetone gas were investigated. The results indicated that the sensor based on TiO 2 / α -Fe 2 O 3 heterostructures measured at 225 °C had a higher response of 21.9 toward 100 ppm of acetone gas which was about 9 times higher than pristine TiO 2 nanorods sensor. The dominant mechanism for enhanced sensing properties were discussed in detail with the semiconductor depletion layer model and TiO 2 / α -Fe 2 O 3 n–n heterojunction theory.
研究领域:
材料科学
·
纳米技术
·
传感器技术
·
气体传感
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Wen-Min Zhong,Xin-Gui Tang,Ling-Ling Bai,Jia-Ying Chen,Hua-Feng Dong,Qi-Jun Sun,Yan-Ping Jiang,Qiu-Xiang Liu
Artificial synapse is basic electronic components used to prepare neuromorphic hardware with integrated storage and computing, high speed and low energy consumption. This work reports an artificial synapse based on perovskite diodes with learning, memory and computing functions. The artificial synapse demonstrates a mechanism for the dual roles of depletion layer width modulation and ion conduction channel, enabling it to complete the calculation task of neural network and memorize data. Artificial synapses are modeled with various neural networks, including single-layer neural networks, deep neural networks, and convolutional neural networks. The results show that artificial synapses show good recognition accuracy for the MNIST dataset. Especially on the convolutional neural network, only relying on more than 3000 parameters has achieved an accuracy rate of 92.4 %.
研究领域:
材料科学
·
类脑计算
·
电子器件
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Hongshan Bi,Qiushi Ma,Xuanling Liu,Lin Xiong,Jun Yi,Shen Ao,Zhengjun Zhang,Hong Lin,Zhou Lin
Metal oxide semiconductor sensors were designed utilizing 0.17 mol% Ni:In 2 O 3 nanoparticles for detecting ppb-level NO 2 in the air. Synthesized using the carbon template hydrothermal method, our Ni:In 2 O 3 nanoparticles achieved a monodispersion of Ni atoms in the crystal structure of In 2 O 3 , with indistinguishable XRD patterns but a slightly different lattice spacing and an average particle size of 35.3 nm. Concerning NO 2 -sensing capacity, our Ni:In 2 O 3 -based sensors outperformed those from similar doped In 2 O 3 nanomaterials regarding higher sensitivity and selectivity. Our maximum dimensionless response values achieved 377 for 500 ppb and 21.7 for 10 ppb at an operational temperature of 100 °C, ∼ 50 times greater than 10 ppm of other gases, and our response and recovery times were comparable to state-of-the-art technology under similar circumstances. Combining the electron depletion layer model and density functional theory, electronic origins of the NO 2 -sensing mechanism on the Ni:In 2 O 3 surface were deciphered based on redox-based chemisorptions of NO 2 . The significantly enhanced response of Ni:In 2 O 3 compared to In 2 O 3 was attributed to the reduced fundamental band gap and the increased number of NO 2 -attracting oxygen vacancy sites on the surface. Our study set the stage for promising applications of Ni:In 2 O 3 and similar metal oxide semiconductor nanoparticles for ppb-level gas detection.
研究领域:
材料科学
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环境监测
·
化学
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry Letters
·
2025
·
IF 4.6
Shuangyu Wang,Man Zhao,Dayong Jiang,Qingcheng Liang
In this work, we demonstrate a filter-free self-powered photodetector based on PTB7-Th:ITIC/ZnO heterojunction that exhibits remarkable selective spectral response characteristics. The device achieves band-selective detection through innovative manipulation of incident light direction, enabling multiple spectral detection capabilities within a single architecture. Under 0 V bias voltage operation, the device exhibits dual-mode detection capability depending on the illumination direction. When illuminated through the ZnO film side, the photodetector demonstrates visible light detection with a peak responsivity of 350 mA W−1 across the 400–800 nm spectral range. Conversely, illumination through the bulk heterojunction film side enables broadband detection from ultraviolet to visible spectrum (300–800 nm), showing distinct responsivity peaks at 2 mA W−1 and 29 mA W−1 for ultraviolet and visible regions, respectively. The selective spectral response characteristics of the PTB7-Th:ITIC/ZnO photodetector are primarily governed by two key factors: the optimized width of the depletion layer region and the distinctive distribution profile of the internal electric field. This work establishes a paradigm for developing autonomous photodetection systems capable of adaptive spectral discrimination, paving the way for advanced optoelectronic applications in complex environmental conditions.
研究领域:
光电子学
·
材料科学
·
纳米技术
·
光子学
·
半导体器件
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS LETTERS
·
2025
·
IF 2.7
Jie Zheng,Chensong Liang,Ying Li,Yongtao Huang,Tianlong Wang,Wei Zhang,Chunsheng Zhuang
The study presents a novel heterostructure electrolyte composed of fluorite-structured Sm 0.2 Ce 0.8 O 1.9 (SDC), hexagonal YBaCo 4 O 7+δ (YBC), and ultra-wide bandgap MgO (∼6.7 eV) as composite materials in this study. Compared to SDC and SDC/YBC electrolyte, the addition of MgO significantly broadens the depletion region and improves charge separation efficiency. Additionally, the ultra-wide bandgap of MgO minimizes electronic conductivity and prevents internal leakage. A fuel cell incorporating this composite electrolyte attained a peak power density of 826 mW cm −2 and an open-circuit voltage of 1.1 V at 550 °C. This represents a 12 % improvement over SDC/YBC electrolytes and a 47 % increase compared to SDC electrolytes. This study demonstrates that the SDC/YBC/MgO composite electrolyte effectively optimizes both ionic transport and interfacial stability.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Cao Cheng,Hongyan Zhang,Fan Li,Shuguo Yu,Yan Chen
In this study, a gas sensor based on TiO 2 /WO 3 ·H 2 O (TW) heterojunction with high sensitivity, excellent selectivity and long-term stability for ammonia (NH 3 ) detection was successfully prepared by hydrothermal method . Compared with WO 3 ·H 2 O and TiO 2 , TW heterojunction shows excellent selective to NH 3 and the response varies by 3 orders of magnitude to 500 ppm NH 3 at room temperature (RT, 25 ± 3 °C). The lowest response limit of TW is 0.5 ppm and the response/recovery time is 2.35 s/1.95 s. The main reason for improving the performance of TW heterojunction to NH 3 detection is that TiO 2 nanoparticles cause more oxygen free radicals on the surface of TW heterojunction, which can react with more NH 3 molecules to release more electrons. Therefore, heterojunction structure increases the electrons and reduces the width of electron depletion layer in TW gas sensor. In addition, TW heterojunction has small and uniform particle size which can provide more active sites for the reaction between NH 3 and oxygen free radicals to release more electrons. This work provides a heterojunction structure composed of TiO 2 and WO 3 ·H 2 O to effectively improve the performance of sensor for NH 3 detection at RT, which is beneficial to the development of high-performance gas sensors.
研究领域:
材料科学
·
化学工程
·
传感技术
✓ 已验证
产品关联
DOI
高影响因子
APL Materials
·
2023
·Vol. 11
·期 10
·
IF 6.1
Wu Jie,Wang Xin,Xu Yubing,Pan Yuzhu,Chai Shunjie,Zhao Jingda,Cheng Qi,Zhao Zhiwei,Li Qing,Bae Byung Seong,Fayemi Omolola Esther,Zhou Jianming,Zhu Ying,Lei Wei
Compared with the pure lead-based MAPbBr 3 (MA = CH 3 NH 3 ) perovskite single crystals (PSCs), tin–lead alloy (MAPb x Sn 1−x Br 3 ) PSCs with higher carrier mobility and longer carrier lifetime are expected to perform as better-quality ionization radiation detectors. In this work, we design MAPbBr 3 –MAPb 0.9 Sn 0.1 Br 3 –MAPb 0.8 Sn 0.2 Br 3 structure detectors by employing solution-process epitaxial growth. Because of the gradient change in tin element proportion, the relatively low mismatch rates between different PSC layers can effectively reduce defects generated at the interface, which improves charge collection efficiency. Moreover, band barriers between different PSC layers form depletion layers due to the differences in band structure, and the high resistivity and built-in electric field of depletion layers can suppress dark current under high voltages. The optimized detector exhibits a high x-ray detection sensitivity of 6.76 × 10 4 μ C Gy −1 cm −2 and the lowest detectable dose rate of 7.4 nGy s −1 under 40 kVp x-ray radiation. Based on 241 Am (5.95 MeV) α particle irradiation, tin–lead HD has lower detection noise and more obvious response compared to MAPbBr 3 PSCs. The electron mobility was indicated as high as 612 cm 2 s −1 V −1 , and the mobility-lifetime ( μ τ) products were measured to be 3.5 × 10 −3 cm 2 V −1 using the Hecht equation, demonstrating superior transport properties.
研究领域:
材料科学
·
辐射检测
·
半导体物理
·
纳米技术
✓ 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）