APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Dan Wang,Ying Chen,Yang Zhang,Xintong Zhang,Norihiro Suzuki,Chiaki Terashima
Extremely rapid high temperature annealing (ER-HTA) was used to boost the photoelectrochemical (PEC) performance of hematite thin film deposited on a TiO 2 nanosheet-modified SnO 2 :F substrate (FTO-TN-HM). The PEC performance of FTO-TN-HM photoanodes were strongly enhanced with increasing ER-HTA temperatures from 700 to 820 °C with a holding time as short as 30 s. The photocurrent density of FTO-TN-HM photoanode treated by ER-HTA at 800 °C was 0.49 mA cm -2 and interfacial hole transfer efficiency of 32% was achieved at 1.23 V vs. RHE, which were 18.8 and 16 times as great as FTO-TN-HM photoanodes annealed at 500 °C for 30 min, respectively. The effect of ER-HTA on the PEC performance of FTO-TN-HM photoanodes were studied comparatively, which suggested that the improved crystallinity, decreased recombination through surface states, and enhanced interfacial Ti 4+ diffusion all contributed to their advanced PEC performance. Our studies confirm that the ER-HTA treatment is an effective method to improve the PEC properties of hematite photoanodes with TiO 2 underlayer and might be applicable for other semiconducting photoelectrodes to get better PEC performance.
研究领域:
材料科学
·
能源科学
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Jing Yu,Weizhi Lin,Hao Cheng,Qin Zhang,Feng Chen
Graphene films have been considered excellent candidates for thermal management and electromagnetic interference (EMI) shielding materials due to their outstanding flexibility, exceptional thermal conductivity, and electrical conductivity. In this study, lignin, a biomass carbon precursor, was added as a welding agent to graphene oxide (GO), and the graphene composite films with enhanced performance were obtained through multi-step high-temperature annealing. Lignin assisted the assembly of GO through hydrogen bonds and covalent bonds, resulting in more compact and ordered precursor films. During the annealing process, lignin played a welding role by synergistically crystallizing with GO, which not only repaired the defects in the graphene sheets but also connected adjacent graphene sheets to form larger sheets. As a result, the graphene composite film achieved a 30.3% improvement in thermal conductivity (1462 W m −1 K −1 ), a 50.0% increase in electrical conductivity (1.49 × 10 6 S m −1 ), and an excellent EMI shielding effectiveness of up to 70.3 dB. Moreover, the composite film exhibited excellent flexibility, with almost no decrease in electrical conductivity after 100,000 folding cycles. This dual-functional graphene film offers a new solution to the heat dissipation challenges and electromagnetic pollution issues posed by the integrated development of electronics, with potential applications in advanced devices, portable equipment, and aerospace fields.
研究领域:
材料科学
·
电子工程
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Miao Zhang,Yongqiao Zhu,Dawei Li,Peizhong Feng,Cheng Xu
In this study, HfO 2 films were prepared using the sol–gel method with HfCl 4 as a precursor, HNO 3 as a hydrolysis inhibitor and polyethylene glycol as an additive. Investigations were then made into the properties and laser damage characteristics of the films after annealing at different temperatures. The prepared films have high transmittance, low absorption and high laser-induced damage threshold (LIDT). Specifically, the LIDT of the film was as high as 31.6 J/cm 2 after annealing at 353 K, and it gradually dropped to 21.7 J/cm 2 after annealing at 573 K, indicating its strong resistance to high temperature. This study reported a novel method for preparing sol–gel HfO 2 films with high LIDT and pinpointed the potential application of the films under high-temperature conditions.
研究领域:
材料科学
·
光学工程
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产品关联
DOI
高影响因子
JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
·
2022
·
IF 3.571
Ruixia Li,Taotao Zhe,Mingyan Li,Jingyan Li,Fan Li,Feier Bai,Lihua Li,Kaixuan Ma,Sihan Shen,Li Wang
Imidacloprid (IDP) residue in modern agricultural production seriously endangers human health and environmental safety. The establishment of a rapid and efficient method for the detection of IDP residue can effectively prevent its harm to human health. Herein, we demonstrate the carbon cloth (CC) prepared by a high-temperature annealing strategy possesses enhanced electrochemical performance, which could be directly used in electrochemical IDP sensing. Annealed carbon cloth (ACC) is endowed with higher defects, rougher surfaces, more functional groups, more hydrophilic surface , and increased ion-accessible surface area. Furthermore, the ACC electrode shows superior electrocatalytic reduction activity towards IDP, possessing a wide linear range of 5–100 μM, a low detection limit of 0.04 μM, and high sensitivity of 35.58 μA mM −1 cm −2 . Meanwhile, this sensor can be applied for sensing IDP in grapes and apples with a good recovery of 96.8–104.1%. Compared with other modified electrodes , the ACC electrode has the advantages of no binder, no complicated modification, excellent detection effect, low cost, and easy large-scale production. Consequently, this work designs a self-supporting metal-free electrode with high electrochemical performance, providing a new idea for the development of environmentally friendly IDP sensors.
研究领域:
分析化学
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环境科学
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农业科学
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产品关联
DOI
PubMed
高影响因子
Materials Today Energy
·
2025
·
IF 8.6
Gang Huang,Zeqin Huang,Hongfei OuYang,Ruiqi Xu,Yanhong Feng,Xiaochun Yin,Guizhen Zhang
As a critical component of lithium-ion batteries (LIBs), separators play a pivotal role in determining their performance and safety. However, the widely use polyolefin separators in commercial LIBs have certain limitations, such as poor affinity with electrolyte and low thermal stability. In this study, we propose an ultra-thin, high-strength composite (UPE/NFS) separator to overcome these problems and enhance the overall performance of LIBs. Ultrahigh molecular weight polyethylene (UHMWPE), nano-fumed silica (NFS), and liquid paraffin (LP) are melt-blended using a twin-eccentric rotor extruder (TERE) to overcome the processing difficulties associated with UHMWPE and to ensure uniform dispersion of the NFS. Following biaxial stretching and LP removal, the UPE/NFS separator undergo high-temperature annealing at 140 °C to optimize its pore structure. The annealing process coarsens the fiber structure and increases the pore size of the separator, significantly improving its mechanical strength, thermal stability, and ionic conductivity. As a result, the battery exhibits better cycling stability, with a high initial capacity of 140.7 mAh g⁻ 1 and a capacity retention rate of 92 % after 150 cycles at 1 C. Therefore, considering the fabrication process, cost, and the comprehensive evaluation of battery safety and performance, the UPE/NFS separator demonstrates significant potential for practical applications.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
JOURNAL OF FLUORINE CHEMISTRY
·
2024
·
IF 1.7
Shaohua Wu,Yu Yang,Shuang Wu,Yanhui Dong,Hao Cui,Daguang Li,Weiping Qin
NaLuF 4 :Yb 3+ ,Er 3+ micrometer prismatic crystals are potential materials for the preparation of optical waveguide devices. However, structural defects and OH – groups are generated inside and on their surfaces during growth processes. The structural defects and OH – groups lead to a large depletion of excitation energy and severely quench the downconversion luminescence of Er 3+ . In addition, the Yb 3+ /Er 3+ co-doping ratio significantly affects the downconversion luminescence of the microcrystals, which in turn affects the performance of the optical waveguide amplifiers based on the microcrystals. By adjusting the co-doping ratio of Yb 3+ and Er 3+ in the microcrystals and removing the defects in the crystals, their downconversion luminescence performance was significantly improved. The results showed that the downconversion luminescence under the excitation from a 980 nm laser reached the maximum value when the doping ratio of Yb 3+ and Er 3+ was 20:1.5. In addition, the OH – groups and structural defects in the micrometer crystals were significantly eliminated by ion-exchange and high-temperature annealing treatments, and the crystalline quality was significantly improved. After ion-exchange and high-temperature annealing treatments, the downconversion luminescence enhancement of NaLuF 4 :Yb 3+ ,Er 3+ microcrystals was 2.5 times that of the untreated samples.
研究领域:
材料科学
·
光学
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产品关联
DOI
高影响因子
OPTICS EXPRESS
·
2019
·Vol. 27
·期 26
·37568-37578
·
IF 3.561
Yongqiao Zhu,Ming Ma,Pu Zhang,Wenzhe Cai,Dawei Li,Cheng Xu
In this study, three different types of ZrO2 films were prepared with different precursors and additives using the sol-gel method. High-temperature annealing was implemented to investigate the impact of temperature on optical properties, microstructure, surface morphologies and absorption of these films. According to the laser-induced damage threshold (LIDT) tests on films having experienced annealing and those implemented with in-situ high temperature, the ZrO2 film with ZrOCl2·8H2O as the precursor and copolymer of silicone and polyaldoxyl ether as the additive had the highest resistance to laser-induced damage. After annealing at 623 K, its LIDT was 21.4 J/cm2, while that at an in-situ high temperature of 523 K was 23.9 J/cm2. The strong high temperature resistance was likely attributed to the usage of carbon-free precursor and high temperature-resistant additive, which contributed to low carbon contents and less structural damage caused by organic matter evaporation. In this context, there were less high temperature-induced impurity and structural defects, leading to higher LIDT values. This study provided a novel method for preparing high temperature-resistant sol-gel films, which shed light upon wider potential application of sol-gel films at high-temperature conditions.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Shuangjiang He,Junchang Wang,Chong Wang,Xiao Zhang,Sen Liang
The Mn-Fe-Co-Zn-O series is a widely used thermistor material, but its thermal stability is compromised by nitrogen glass encapsulation, limiting its application in electrical devices. To address this issue, La 2 O 3 and Y 2 O 3 were used as rare earth oxide dopants, and xR 2 O 3 -Mn 0.76 Fe 0.87 Co 1.07 Zn 0.3 O 4 (x = 0.0025, 0.005, 0.01, 0.02) negative temperature coefficient (NTC) materials were synthesized via solid-state sintering. The effect of rare earth doping on the electrical properties after high-temperature nitrogen annealing was investigated. After annealing at 750°C for 4 h, the variation in resistivity ( ρ 25 ) and material constant ( B 25/50 ) significantly decreases with increasing La doping. For the La-doped sample (x = 0.01), Δρ 25 decreased to 7.77% and ΔB 25/50 to 0.77% (for the Y-doped sample (x = 0.01), Δρ 25 decreased to 22.76% and ΔB 25/50 to 1.91%), compared to the undoped sample, where Δρ 25 reduced by 168.84% and ΔB 25/5 0 by 5.57%. This improvement was attributed to rare earth accumulation at grain boundaries, filling voids and forming R-O bonds, which inhibited oxygen vacancy migration and significantly reduced grain boundary resistance. Rare earth doping effectively improved the thermal stability and electrical consistency of NTC thermistor ceramics in high-temperature nitrogen atmospheres, offering a new strategy for high-temperature encapsulation applications. (Y-doped samples showed similar results, as detailed in the Supplementary Materials.)
研究领域:
材料科学
·
无机非金属材料
·
电子陶瓷
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热敏材料
·
固态化学
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产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 6
·1-8
·
IF 5.479
Yalikun Nuerbiya,Mamat Xamxikamar,Li Yongtao,Hu Xun,Wang Ping,Hu Guangzhi
The authors describe a method for synthesis of a nanomaterial consisting of porous carbon encapsulated Mg-Al-Si alloy (denoted as Mg-Al-Si@PC) nanocluster. The nanocluster was synthesis by a solvothermal reaction, followed by high-temperature annealing. The nanoclusters were used as a novel immobilization platform for electrochemical sensing of rutin. The electrochemical behavior of rutin at a modified electrode was investigated by cyclic voltammetry and differential pulse voltammetry. The modified electrode demonstrates a high electrocatalytic activity toward rutin oxidation at a relatively low working potential (0.6 vs. Ag/AgCl). Under optimal conditions, the sensor has a linear response in the 1–10 μM rutin concentration range, and a 0.01 μM lower detection limit (at an S/N ratio of 3). It was successfully applied to the quantification of rutin in pharmaceutical tablets, and satisfactory results were obtained. Furthermore, the results correspond with those with the standard method and with the amounts indicated by the producer, respectively.
Schematic diagram of the Mg-Al-Si@PC nanocluster preparation process and electroanalysis mechanism.
研究领域:
材料科学
·
电化学
·
纳米技术
·
分析化学
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产品关联
DOI
PubMed
高影响因子
Frontiers of Chemical Science and Engineering
·
2023
·Vol. 17
·期 12
·2050-2060
·
IF 4.5
Ren Jiahui,He Yongping,Sun Haidong,Zhang Rongzi,Li Juan,Ma Wenbiao,Liu Zhong,Li Jun,Du Xiao,Hao Xiaogang
Reducing the dissolution of Mn from LiMn 2 O 4 (LMO) and enhancing the stability of film electrodes are critical and challenging for Li + ions selective extraction via electrochemically switched ion exchange technology. In this work, we prepared a nitrogen-doped carbon cladding LMO (C-N@LMO) by polymerization of polypyrrole and high-temperature annealing in the N 2 gas to achieve the above purpose. The modified C-N@LMO film electrode exhibited lower Mn dissolution and better cyclic stability than the LMO film electrode. The dissolution ratio of Mn from the C-N@LMO film electrode decreased by 42% compared to the LMO film electrode after 10 cycles. The cladding layer not only acted as a protective layer but also functioned as a conductive shell, accelerating the migration rate of Li + ions. The intercalation equilibrium time of the C-N@LMO film electrode reached within an hour during the extraction of Li + ions, which was 33% less compared to the pure LMO film electrode. Meanwhile, the C-N@LMO film electrode retained evident selectivity toward Li + ions, and the separation factor was 118.38 for Li + toward Mg 2+ in simulated brine. Therefore, the C-N@LMO film electrode would be a promising candidate for the recovery of Li + ions from salt lakes.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Shuwen Zheng,Chenhao Cong,Fuhao Jiang,Shoukun Yu,Bingxiang Li,Fenglin Sun,Xianbin Zheng,Binxuan Diao,Sang Woo Joo,Rong Li,Se Hyun Kim,Xinlin Li,Zhijun Li
In recent years, significant advancements in printed electronics and flexible materials have catalyzed the development of electronic skins for wearable applications. However, the low glass transition temperature of flexible substrates poses a challenge as it is incompatible with the high-temperature annealing required for electrode fabrication, thereby limiting the performance of flexible electronic devices. In this study, we address these limitations by proposing a novel flexible device manufacturing process that combines adhesive printing patterning with a transfer printing technology. By employing poly(vinylidene fluoride) (PVDF)/graphene nitride (GCN) as the transfer substrate and dielectric layer, we successfully fabricated a high-performance dual-mode touch sensor on a large scale. The successful development of this dual-mode sensor can be attributed to two key factors: the construction of a robust hydrogen-bonding network between the PVDF/GCN dielectric layer and the carbon electrode and the ability of GCN to restrict the movement of PVDF molecular chains within the dielectric layer. This restriction reduces the overall polarization of the film, enabling the formation of a complete device structure with a highly sensitive edge electric field. The noncontact sensors developed in this study are fully printable into sensor arrays and can be seamlessly integrated with internet of things technology for wearable applications. These sensors exhibit exceptional tactile response and facilitate effective human–machine interactions over extended distances, underscoring their significant potential in fields such as healthcare and artificial intelligence.
研究领域:
材料科学
·
电气工程
·
可穿戴技术
·
传感器
·
物联网
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 15
·8479-8490
·
IF 14.511
Zhe Su,Wanyu Zhang,Jiawei Lu,Liying Tian,Shan Yi,Yayun Zhang,Shenghu Zhou,Bo Niu,Donghui Long
Metal-oxide/carbon composites with remarkable dielectric-magnetic properties are promising as microwave absorption materials, but achieving high-attenuation and broadband microwave absorption properties still remains challenging. Herein, we develop a one-step carbonization of the ferric gluconate precursor to manufacture two-dimensional oxygen-vacancy-rich Fe3O4/carbon nanosheets (Fe3O4/C) for high-attenuation microwave absorption. The key to the synthesis is employing the Fe3+-gluconate complex as the precursor, which has the ability to release small molecules within the viscosity foaming window to spontaneously obtain a 3D self-foamed material. Followed by high-temperature annealing, the as-obtained Fe3O4/C hybrid composite features large lamellar (>20 μm) carbon nanosheets with abundant yolk–shell heterostructures and highly dispersed and high-loaded (∼44%) oxygen-vacancy-rich Fe3O4 nanocrystals. The unique 2D structure could facilitate multiple scattering absorption and interconnect into a 3D conductivity-loss network. Meanwhile, the abundant yolk–shell heterostructures could trigger extra interfacial polarization. And density functional theory calculation results demonstrate that oxygen vacancies endow magnetic Fe3O4 nanocrystals with charge-separation induced polarizations. Consequently, Fe3O4/C exhibit superior microwave absorption capability with an impressive reflection loss (RL) of −65.4 dB and an ultra-broad effective absorption bandwidth of 6.24 GHz. The spontaneous foaming strategy in this work could provide feasible technological approaches for the practical fabrication of microwave absorption materials.
研究领域:
材料科学
·
电磁材料
·
纳米技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）