IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
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2021
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IF 4.016
Xingyi Wu,Yijie Dai,Chen Fu,Xiaobo Zhu,Wenhua Gu,Daying Sun,Wen Wu,Xiaodong Huang,Zhongxiang Shen
Sheet resistance is one of the essential properties of thin films, and the change of it under different conditions is the basis of various sensor designs. However, the contact resistances between the thin-film materials and the metal electrodes can seriously affect the sensing accuracy. Due to various material properties, the contact resistances are usually difficult to be managed or reduced, and even nonlinear Schottky barriers can form in some cases. A modified four-terminal method is proposed to eliminate the impact of contact resistances through simple resistance measurements and algebraic calculations, which can be easily integrated into sensors and accurately measure the sheet resistances/resistivities of thin films of different materials under different conditions. The carbon black/polydimethylsiloxane (CB/PDMS) thin film is taken as an example for demonstration of the method. The applications for pressure-sensitive and temperature-sensitive resistance measurement are also demonstrated.
研究领域:
材料科学
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传感器技术
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 17
·21923-21931
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IF 2.478
Wu Ruifeng,Lin Yuanwei,Liu Yafei,Chang Aimin,Zhao Pengjun,Zhang Bo
In this study, x LaMnO 3 -(1 − x )CaCu 3 Ti 4 O 12 (0 ≤ x ≤ 0.7) composite ceramics have been prepared by the conventional solid-state method. XRD results show that the composite ceramics are mainly composed of LaMnO 3 and CaCu 3 Ti 4 O 12 phases. Electrical property analysis shows that the resistivity ρ 25 gradually decreases from 2.17 × 10 8 to 1.74 × 10 5 Ω·cm with increasing LaMnO 3 content. The relationship between ln ρ and 1000/ T is not linear and changes around 350 °C. In the temperature range of 0–350 °C, the activation energy E a 0–350 °C decreases gradually with the increase of the LaMnO 3 content. In the temperature range of 350–500 °C, the activation energy E a 350–500 °C increases first and then decreases, which is related to the variation of oxygen vacancy. The compounding of LaMnO 3 gives rise to the decrease in B value, thus, providing the potential for the applications of wide temperature range thermistors. After annealing, the coefficient of aging (Δ R / R ) of the composites decreases from 23.73 to 3.01%.
研究领域:
材料科学
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电气工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Songrong Cheng,Yingjuan Li,Kaizhao Wang,Qianxu Ye,Kun Dong,Yunzhu Wang,Sufang He,Chunjian Wang,Lingde Kong,Feng Liu,YongQiang Yang,Ji Ma,Qingming Chen,Sheng'an Yang
Polycrystalline manganese oxides exhibit remarkable tunable magnetoresistance (MR) and anisotropic magnetoresistance (AMR), rendering them highly promising for magnetic sensor applications. However, their practical utilization is hindered by two critical challenges: (i) the requirement of high magnetic fields to achieve optimal electromagnetic properties, and (ii) the deviation of the metal-insulator transition temperature (T MI ) from room temperature. In this study, La 0.68 Sm 0.02 Ca 0.3 MnO 3 :Ag x ( x = 0.1–0.4) composites were synthesized via sol–gel and solid-phase methods. Notably, at x = 0.2, exceptional MR and AMR values of 88 % and 123 %, respectively, were achieved near room temperature under a low magnetic field of 1 T. This represents the highest AMR performance reported to date for polycrystalline materials under similar conditions, comparable to thin films. The incorporation of Ag was found to mitigate grain boundary scattering while enhancing interfacial spin polarization, thereby significantly improving MR. The extraordinary AMR is attributed to the anisotropic spin–orbit coupling (SOC) effect. Resistivity data were well–fitted using electron-scattering and small-polaron hopping models, further validating the pivotal role of SOC in enhancing AMR under varying magnetic fields. These findings provide a robust foundation for advancing perovskite manganese oxides in manganite–based device applications.
研究领域:
材料科学
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物理学
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产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
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2024
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IF 5.3
Siyuan Jin,Jie Zhou,Ruizhi Wu,Xiaochun Ma,Mengyao Pang,Zhe Yu,Guixiang Wang,Jinghuai Zhang,Boris Krit,Sergey Betsofen,Neshchimenko Vitalii,Buzikov Ruslan,Min Qiu,Yurong Yang,Jiaming Chen
A multi-structured composite coating with superhydrophobic properties, corrosion resistance, and wear resistance was prepared on the surface of Mg-9Li-3Al alloy. A porous layer was formed on the substrate surface via micro-arc oxidation. Then, LDH was grown in situ on the MAO coating surface through hydrothermal treatment, sealing the pores in the coating. Finally, HDTMS-SiO₂ was assembled on the LDH surface. The SiO₂ formed an island-like micro-nano structure, trapping air and creating an “air cushion” on the coating surface，imparting superhydrophobicity (contact angle and sliding angle of 162.1 ± 2.1° and 4.2 ± 0.2°). And the corrosion resistance of the MLS coating is significantly improved the corrosion current density decreased by three orders of magnitude. The incorporation of HDTMS-SiO₂ not only improved the corrosion resistance of the coating but also significantly enhanced its wear resistance. During friction, the SiO₂ nanoparticles acted as “ball bearings,” shifting the friction mode from sliding to rolling. The fragmented SiO₂ further served as a solid lubricant, reducing the coefficient of friction to 0.11.
研究领域:
材料科学
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表面工程
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
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IF 4.084
Jianyu Wang,Luofu Min,Feifei Fang,Wen Zhang,Yuxin Wang
We report in this paper a simple method of coating very thin graphene film on titanium substrate, affording it markedly enhanced resistance to corrosion and much decreased electrical contact resistance under the environment of proton exchange membrane fuel cells (PEMFC). The graphene film is formed by electrodepositing graphene oxide (GO) on Ti sheet via normal pulse voltammetry , followed by reducing the deposited GO at 500 °C in hydrogen atmosphere. The resultant graphene film, with a thickness of only around 50 nm, evenly covers and covalently bonds to the Ti sheet, as revealed by SEM, Raman and XPS . Both potentiodynamic and potentiostatic tests of the graphene coated Ti (G/Ti) sample are conducted under simulated chemical environment and electrode potentials of PEMFC. Under all the circumstances, the corrosion currents of G/Ti sheet are in the order of 10 −7 A/cm 2 , significantly less than that of bare Ti sheet. Moreover, the coated graphene film on Ti sheet leads to a much lower and more stable interfacial contact resistance (ICR) of around 4 mΩ cm 2 . These results mean that the G/Ti sheet meets the U.S. DOE target of 2020 for PEMFC bipolar plates (BP) in terms of both the corrosion and electrical resistance. Therefore, the G/Ti sheet appears to be a very promising BP material in PEMFC.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 13
·18397-18407
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IF 2.478
Gao Yan,Li Ling,Li Yule,Yang Sheng’an,Ma Ji,Li Yingjuan,Qi Longfei,Yang Yunrui,Wu Dingzhang,Zhang Hui,Chen Qingming
Doping is a primary method to improve the temperature coefficient of resistance ( TCR ) and magnetoresistance ( MR ) of La 1- x A′ x MnO 3 polycrystalline in a low magnetic field. La 0.7 Ca 0.3- x Na x MnO 3 ( x = 0, 0.02, 0.04, 0.06, 0.08) series of polycrystalline were synthesized by the sol–gel method. X-ray diffraction patterns indicate that the crystal structure changes from orthorhombic to rhombohedral, and the space group changes from Pnma to \(\text{R}\stackrel{\mathrm{-}}{\text{3}}\text{c}\) with increasing x . With Na-doping rise, the increase in grain size reduces grain boundaries, weakening the electron scattering at grain boundaries and decreasing the peak resistivity. The excellent MR (59.51%) is observed in La 0.7 Ca 0.24 Na 0.06 MnO 3 at the 1 T magnetic field. Meanwhile, TCR max reaches 12.36% K −1 in the absence of a magnetic field. The resistivity variation with temperature curve fitting illustrates that grain boundary scattering dominates in the low-temperature stage, and the effect of activation energy dominates in the high-temperature stage.
研究领域:
材料科学
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物理学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yan Xue,Wenye Deng,Yuyu Liu,Xuelian Bai,Xianghui Chen,Pengjun Zhao,Ye Pan,Huimin Zhang,Aimin Chang,Yongxin Xie
A series of novel negative temperature coefficient (NTC) thermistor materials based on La 1- x Ce x AlO 3 (0 ≤ x ≤ 0.2) ceramics were synthesized via the solid-state route. X-ray diffraction results confirmed the successful doping of Ce in the La 1- x Ce x AlO 3 crystal and the formation of a good solid solution. Scanning electron microscopy results indicated that Ce doping is beneficial for grain growth and reduces the porosity of the samples. With the increase in the Ce doping amount, the average grain size increased from 2.1793 to 10.7344 μm, and densities of the ceramics increased from 93.15% to 99.26%. The temperature vs resistance curve indicated that Ce doping reduces the resistivity of LaAlO 3 materials, while reducing the B 200/1400 value of the LaAlO 3 ceramic. For a doping amount of 0.2, the B 200/1400 value of the LaAlO 3 ceramic decreased from 18175.1 to 4897.7K, and the resistivity at 1000 °C decreased from 68971.87 to 1105.15 Ω cm. In addition, the La 1- x Ce x AlO 3 (0 ≤ x ≤ 0.2) series materials exhibited good linear NTC characteristics. X-ray photoelectron spectroscopy results revealed that the resistivity of the LaAlO 3 materials decreased after Ce doping owing to the transformation between the Ce 4+ and Ce 3+ valence states，and the concentration of Ce 3+ increased with the increase in the Ce doping amount. Ce 3+ increases the concentration of oxygen vacancies , decreasing the resistance. Impedance analysis findings suggested that the resistance of the La 1- x Ce x AlO 3 (0 ＜ x ≤ 0.2) material mainly originates from the grain. These results indicate that Ce doping is an effective method to reduce the resistivity of LaAlO 3 . Consequently, La 1- x Ce x AlO 3 (0 ≤ x ≤ 0.2) is a promising material for NTC applications.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Sheng’an Yang,Qingming Chen,Yunrui Yang,Yan Gao,Ruidong Xu,Hui Zhang,Ji Ma
Perovskite manganite La 1− y Ca y MnO 3 has giant and tunable magnetoresistance ( MR ) and anisotropic magnetoresistance ( AMR ), still the following two challenges are of great concern: (i) large magnetic field is required for achieving excellent electromagnetic performance; and (ii) metal–insulator (M–I) transition temperature ( T MI ) significantly different from room temperature; both these factors limit its practical applications. In this study, polycrystalline La 0.7 Ca 0.3 MnO 3 :Ag x composites were fabricated by sol–gel and solid–phase addition methods, and large MR and AMR (84.1% and 32%, respectively) were obtained at near room temperature in 1 T magnetic field when x = 0.2. Evidently, it was found that the grain boundary scattering effects were weakened due to Ag−addition, which resulted in an enhancement of MR . The tremendously high AMR value was attributed to the anisotropic spin–orbit coupling (SOC) effect. The electron–scattering and small–polaron hopping models were used to successfully fit the resistivity data, which support the SOC effect under different magnetic fields that enhance the AMR . These results support further development of the perovskite manganese oxide with potential applications in manganite devices.
研究领域:
材料科学
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物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xiaohan Yu,Shuaizhao Jin,Xiaoli Guan,Yixin Yan,Kaikai Wu,Liming Zhao,Xiang Liu
La 1- x A x MnO 3 (A = alkaline-earth or alkali metal) perovskites with large temperature coefficient of resistivity ( TCR ) offer immense opportunity for the application in high-performance infrared bolometer. However, numerous studies have revealed that the manganite films with large TCR values are not easily obtained by various fabrication technologies. Herein, a facile sol-gel spin-coating technique was used to prepare La 1- x Ca x MnO 3 (LCMO, 0.280 ≤ x ≤ 0.375) films. All the samples were highly oriented along the out-of-plane direction of La 0.3 Sr 0.7 Al 0.65 Ta 0.35 O 3 (001) substrates. With the rise in Ca doping amount, the resistivity of the films first decreased, and then, increased. This change can be attributed to the competition between the carrier concentration and lattice distortion. The LCMO films displayed large TCR and low-field magnetoresistance ( MR ) values, which exceeded those of previously reported thin films. The maximum TCR and low-field MR values were observed at x = 0.330, reaching 30.13% K −1 (266.43 K) and 68.6% (270.08 K), respectively. The La 0.67 Ca 0.33 MnO 3 film with large TCR and MR values presents potential for the applications in high-sensitivity infrared bolometers and magnetic sensors.
研究领域:
材料科学
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物理学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Chun Ouyan,Xinlong Zhang,Mingfang Wu,Damao Xun,Pingping Gao
Ni-P coatings including TiN nanoparticles are prepared by electroless plating on Ti plate, which is used as bipolar plates of proton exchange membrane fuel cells (PEMFCs). Scanning electronic microscope (SEM) and X-ray diffraction (XRD) are used to characterize the surface morphology and phases of the coatings, respectively. Corrosion resistance of Ni-P and Ni-P/TiN coatings are measured in the simulated solution of PEMFCs. The interfacial contact resistances (ICR) between carbon paper and bipolar plates are conducted by applied different forces. Potentiostatic polarization tests are prepared at different voltage by bubbling air and H2 at 70 °C, respectively. It is indicated that TiN particles as a core enclosed by Ni-P are entrapped into the coating by SEM images. Comparing to Ni-P coatings, the Ni-P/TiN coating shows better behaviors of corrosion resistance and low ICR. The good corrosion resistance is attributed to the formation of coating and the compact surface morphology. Hence, Ti metal with electroless plating Ni-P/TiN coating is a potential candidate for applying in the bipolar plates of PEMFCs
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Xiaohui Li,Xiaoyi Chen,Bo Gao,Yanwei Fan,Yige Wang,Xin Kang,Wenwen Kong,Aimin Chang
A series of novel negative temperature coefficient thermistor materials based on SrCe x Nb x WO 4+4x (0.1 ≤ x ≤ 0.8) ceramics was synthesized by the solid-state route. X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy revealed that the SrCe x Nb x WO 4+4x ceramics were composed of scheelite structural solid solution based on the SrWO 4 phase and a CeNbO 4.08 secondary phase that exhibited a fergusonite structure. The resistance-temperature analysis demonstrated that the resistivity ρ 800 of the SrCe x Nb x WO 4+4x ceramics decreased from 8.25 ± 0.08 × 10 6 to 2.52 ± 0.11 × 10 2 with the increase of x value, along with a decrease in the thermal constant B from 11,102 ± 97–4137 ± 37 K. It was observed that the SrCe x Nb x WO 4+4x ceramics exhibited high resistivity and excellent aging characteristics as well as suitable B values at elevated temperatures, making it a promising candidate that can be used for the fabrication of high-temperature NTC thermistors with a wide operating temperature range.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Chen Yan,Dandan Liang,Dahong Chen,Yanling Yu,Zhaohan Zhang,Jiajie Zhou,Yujie Feng
The remediation of polycyclic aromatic hydrocarbons (PAHs) contaminated soil has attracted global attention. Soil microbial fuel cells (SMFC) can induce inherent electric fields to enhance pollutant removal, thereby shedding light on the remediation of PAHs contaminated soil. However, the remediation efficiency is hindered by the high internal resistance within the soil environment. This study proposed the integration of biochar granular (BCG) with SMFC to mitigate internal resistance and enhance PAHs removal efficiencies. The results illustrated that compared to SMFC, 2 % BCG-SMFC increased the removal efficiencies of phenanthrene (PHE) and pyrene (PYR) to 67.4 ± 1.5 % and 58.6 ± 1.9 %. The accompanying power density reached 44.1 mW m −2 , and this was 4.0-fold that of SMFC (11.0 mW m −2 ). Additional investigations demonstrated that adding BCG increased soil porosity and permeability. The porosity rose from 40.7 ± 3.8 % (raw soil) to 48.2 ± 0.5 % (1 % BCG soil) and 52.0 ± 0.3 % (2 % BCG soil), while permeability coefficients for 1 % BCG and 2 % BCG soils were approximately 1.27- and 1.38-fold that of raw soil (0.26 ± 0.01 mm/min). Thus, the ohmic resistance (R ohm ), charge transfer resistance (R ct ), and diffusion resistance (R d ) of the SMFCs with BCG (BCG-SMFCs) were significantly reduced, and this was beneficial for the power output and PAHs removal. Through the analysis of microbial communities, adding BCG increased the enrichment of PAHs-degrading bacteria such as Pseudomonas sp ., Lysobacter sp., Chitinophaga sp., Ralstonia sp., and Phenylobacterium sp . in BCG-SMFCs. Enzymes responsible for PAHs degradation were also highly expressed in BCG-SMFCs. This study suggested a novel approach for enhancing soil porosity and permeability by introducing BCG into SMFC, thereby improving the in situ bioremediation efficiency of PAHs contaminated soil.
研究领域:
环境科学
·
生物技术
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土壤学
·
微生物学
✓ 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）