MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2024
·
IF 4.2
Jiandong Hao,Ling Li,Bin Zhang,Ningqiang Shi,Tingwei Yan,Jinchang Meng
We used dry-wet transfer to prepare boron nitride nanoribbons (BNNRs) film. The effects that the different BNNRs film areas by dry transfer, the different areas and thicknesses of BNNRs film by wet transfer on BNNRs deep ultraviolet (DUV) detector were investigated, respectively. There is an excellent capability of detection and sensing for dry transfer DUV detector. The photocurrent rises with the area of the film. The maximum photocurrent ( I phmax ) is 34 pA at 1.64 mW/cm 2 (0.3 × 0.7 cm 2 , 30 mg). Rise and fall time are around 0.38s/0.41s. The responsivity and detectivity are 0.23μA/W and 5.57 × 10 7 (0.41 mW/cm 2 , V bias = 10V). The direct transfer of the MCE filter membrane by wet transfer can control the size and thickness of the film. The I phmax becomes larger with the thickness of the BNNRs film ( I phmax : 171 pA). And the time response is about 0.73s/0.72s, the responsivity and detectivity are up to 0.71μA/W and 1.72 × 10 8 (0.41 mW/cm 2 , V bias = 10V). However, it does not have a better ability to sense the DUV light than dry transfer. Therefore, different transfer methods can be applied to various requirements. This provides a good prospect for the high-performance DUV detectors.
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高影响因子
FUEL
·
2017
·
IF 4.601
Zhong-Qiu Liu,Xian-Yong Wei,Hai-Hong Wu,Wei-Tu Li,Yang-Yang Zhang,Zhi-Min Zong,Feng-Yun Ma,Jing-Mei Liu
Modified microfiber attapulgite (MFA)-supported nickel was prepared by thermally decomposing nickel tetracarbonyl on MFA modified with an acidic ionic liquid (AIL, 1-sulfobutyl-3-methylimidazolium trifluoromethanesulfonate). It was characterized with multiple instruments and used for catalyzing hydroconversion of lignite-related model compounds (LRMCs) oxydibenzene, benzyloxybenzene, and oxybis(methylene)dibenzene. The results indicate that Ni 15% /MFA@AIL effectively catalyzes hydroconversion of the LRMCs to afford cyclanes by inducing the formation of H + , H − , and biatomic active hydrogen.
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高影响因子
CORROSION SCIENCE
·
2017
·
IF 5.245
Daxin Li,Zhihua Yang,Dechang Jia,Xiaoming Duan,Shengjin Wang,Qishuai Zhu,Yang Miao,Jiancun Rao,Yu Zhou
The high-temperature oxidation behavior of various boron addition SiBCN monoliths has been explored. Boron addition promotes the formation of new B x C phase and growth of SiC gains. At the initial stage of oxidation, surface B x C and BN(C) are prior to SiC generating B 2 O 3 . As time progresses, SiC oxidizes to SiO 2 further reacted with B 2 O 3 forming stable SiO 2 -B 2 O 3 binary melt or borosilicate. Boron-enhanced SiC oxidation occurs immediately with the rapid consumption of BN(C), B x C and loss of B 2 O 3 from borosilicate decomposition, thereby promoting oxidation rate. Substantial SiC and BN(C) in amorphous SiO 2 for transition layer is the main structure feature.
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高影响因子
POLYMER DEGRADATION AND STABILITY
·
2025
·
IF 7.4
Bowen Dai,Yiran Zhao,Zhendong Huang,Xiangling Chen,Qiang Liu,Wei Huang,Hongbing Chen
Rubber materials would adhere to metal substrates when compressed together for a certain time. The specific mechanisms of such adhesion are still unclear. In this work, silicone rubbers and metals with various chemical structures were utilized to reveal the gecko-like adhesion mechanism. The Sum Frequency Generation Vibrational Spectroscopy (SFG) and in-situ Diffuse Reflaxions Infrared Fourier Transformations Spectroscopy (DRIFTS) results demonstrated that van der Waals forces are the inevitable interactions at any silicone rubber/metal interface. Hydrogen bond interactions can be observed when the interface is rich in hydroxyl groups, contributing to higher adhesion strength and rate. The interactions could be affected once containing other groups (e.g. large steric hindrance groups or certain inorganic fillers) in the chemical structure. This work could provide inspirations for designing the materials with adjustable adhesion ability or intelligent adhesion system.
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高影响因子
JOURNAL OF NUCLEAR MATERIALS
·
2024
·
IF 2.8
Jiaqi Li,N. Daghbouj,Xiaoxun He,Ke Chen,Xingzhong Cao,Shuoxue Jin,Jun Li,Haiyuan Wei,Junjun Zhou,Tongmin Zhang,Shuai Xu,Fangfang Ge,J. Duchoň,A.T. AlMotasem,T. Polcar,Bingsheng Li
Layered carbides and borides, blending ceramic and metallic characteristics, present compelling prospects for future nuclear reactor applications due to their complex nanolaminate crystal structure. To explore the behavior of Fe 2 AlB 2 under different conditions, helium irradiation is conducted across saturation fluences and under different annealing and irradiation temperatures. Room temperature (RT) irradiation causes some changes: a-lattice expands 0.3 %, c-lattice contracts 0.07 %, and an embedded amorphous layer into the matrix is formed. 400 °C annealing keeps an amorphous structure whereas 800 °C annealing fully recrystallizes with bubble growth. Increasing the irradiation temperature to 400 °C with the same fluence, smaller bubbles form without an amorphous layer, indicating defect recombination depends on helium attachment to vacancies. Under irradiation at 700 °C, faceted bubbles develop exclusively within Fe 2 AlB 2 , with no such bubbles in Al 2 O 3 . These faceted bubbles align themselves along (110) planes. Simultaneously, irradiation prompts tangled dislocations within the damaged layer, fostering the congregation of polygonal bubbles along grain boundaries (GBs) and creating denuded areas at GBs. Fe 2 AlB 2 demonstrates remarkable oxidation resistance under high-temperature irradiation, maintaining surface stability without the cracks seen in ion-irradiated Ti 3 SiC 2 and Ti 2 AlC at RT. Fe 2 AlB 2 shows promise for use in reactors operating at temperatures above 500 °C due to its resilience to irradiation. Further investigation is warranted for its application in reactors operating in environments exceeding this threshold temperature.
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高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Guangyao Yang,Weiliang Peng,Zhipeng Chen,Shaobo Li,Qiying Han,Renzong Hu,Bin Yuan
Nickel–molybdenum–boron (Ni–Mo–B)-based catalysts with biphasic interfaces are highly advantageous in bifunctional electrocatalytic activity in alkaline water-splitting. However, it remains an ongoing challenge to obtain porous Ni–Mo alloy substrates that provide stable adhesion to catalysts, ensuring the long-term performance of bifunctional self-supporting electrodes at a high current density. Herein, a porous Ni–Mo alloy substrate was effectively obtained by a cost-effective dealloying process on a commercial Ni–Mo alloy with high-energy crystal planes. Subsequently, the Mo2NiB2/Ni3B bifunctional catalyst was in situ synthesized on this substrate via boriding heat treatment, resulting in outstanding catalytic activity and stability. Density functional theory (DFT) calculations reveal that the abundant biphasic interfaces and surface-reconstructed sites of the Mo2NiB2/Ni3B catalyst can decrease the energy barriers for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively. Thus, the designed self-supporting electrodes show bifunctional catalytic activity with overpotentials of 151 mV for HER and 260 mV for OER at a current density of 10 mA cm–2. Markedly, the assembled water electrolyzer can be driven up to 10 mA cm–2 at 1.64 V and maintain catalytic activity at a high current density of 1000 mA cm–2 for 100 h. The new strategy is expected to provide a low-cost scheme for designing self-supporting bifunctional electrodes with high activity and excellent stability and contribute to the development of hydrogen energy technology.
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PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Guoqing Wang,Pengxing Cui,Longfei Jiang,Lianghao Chen,Peter Tatarko,Fengjun Zhang,Xiaobing Zhou
In this study, a highly dense GdB 6 bulk ceramic material was fabricated using one-step in-situ reaction spark plasma sintering technology. The sample with a relative density of 96.7 % and a purity of 96.9 wt% was successfully obtained by sintering at 1800 °C for 30 min under a uniaxial pressure of 50 MPa. The Vickers hardness , elastic modulus and fracture toughness of the as-obtained GdB 6 bulk ceramics were 18.9 GPa, 209 GPa and 1.6 MPa·m 1/2 , respectively. The thermal conductivity of GdB 6 at room temperature was 28.68 W·m −1 ·K −1 , 70 % of which was mainly attributed to phonon vibration, while the remaining 30 % to the electrical thermal conductivity. In addition, the as-obtained GdB 6 ceramics showed no phase transformation after heat treatment at a relatively high temperature of 2100 °C for 20 min in Ar atmosphere. The highly covalent octahedral boron framework played a critical role in maintaining the phase stability of the GdB 6 crystal lattice . This suggested that GdB 6 ceramics could be used as potential ultra-high temperature ceramics for aerospace applications and high-power vacuum electronic devices operated at high temperatures.
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2018
·Vol. 101
·期 7
·3205-3221
·
IF 2.956
Daxin Li,Zhihua Yang,Dechang Jia,Delong Cai,Shengjin Wang,Qingqing Chen,Yu Zhou,Dongli Yu,Yongjun Tian
Amorphous boron-rich SiBCN were prepared by high-energy ball-milling of the mixtures of Si, graphite, h-BN, and inorganic boron, which acted as extra boron source. The solid-state amorphization, thermal stability, and crystallization of the boron-rich SiBCN were studied in detail. It was suggested that mechanical alloying can drive solid-state amorphization but also can be an initiation step for the nucleation of nanocrystals. The amorphous networks of Si-C, C-B, C-C, C-N, B-N, and C-B-N bonds are detected by XPS; however, solid-state NMR further confirms the formation of a new chemical environment around B atoms, BC 3 . The increases in boron content improve the thermal stability of SiBCN ceramics but weaken their oxidation resistance. Nano-SiC crystallizes first while BN(C) forms subsequently. Boron promoting SiC crystallization may result from the reduced hindering effects of B-N-C nanodomains that retard SiC crystallization.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2017
·
IF 3.454
Daxin Li,Zhihua Yang,Dechang Jia,Xiaoming Duan,Yu Zhou,Dongli Yu,Yongjun Tian,Zihuan Wang,Yinglong Liu
Nanocrystalline SiBCN monoliths with the same Si/C/N mole ratio and various boron additions ranged from 0 to 3.0 mol were prepared by mechanical alloying plus reactive hot pressing methods. Correction of boron content and microstructural/morphological evolution was investigated in detail by XRD , SEM, TEM and STEM-EDX structure characterization. Except for SiC and BN(C), boron addition contributes to B x C formation. Besides, boron addition promotes the crystallization of SiC, leading to the formation of poor crystallinity of spherical structures in inner SiC. Furthermore, boron addition significantly promotes the grain growth of SiC and B x C and therefore increases the relative volume ratios of B x C/BN(C) and B x C/SiC. Amorphous-like BN(C) changes to belt-like structures as boron addition increases. The new formed B x C effectively contributes to the improvement of Vicker’s hardness while pull-out of BN(C) belt-like structures benefits the fracture toughness.
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2018
·Vol. 101
·期 8
·3617-3626
·
IF 2.956
Deng Pan,Shufeng Li,Xin Zhang,Bo Pan,Shengyin Zhou,Yabo Fu,Katsuyoshi Kondoh
Strip-shaped W 2 B 5 reinforced B 4 C ceramic composites were prepared via in situ reaction of boron(B)-graphite(Gr)-WC system by powder metallurgy (P/M). In order to study the effect of the graphite content on the properties of the as-fabricated ceramic composites, the powder mixture of B-Gr-WC with various amounts of Gr powder were blended and consolidated by spark plasma sintering (SPS). The sintering parameters were shown as following: sintering pressure was set as 30 MPa; The three-step sintering temperature was 1100-1550-1700°C and the duration time was set as 5-5-6 minutes, respectively. In situ formed strip-shaped W 2 B 5 particles were dispersed homogeneously in B 4 C matrix, which resulted in a remarkable improvement on the fracture toughness and mechanical properties. Appropriate 5vol% residual Gr in the composite shows positive effect on the mechanical properties which achieved an optimal counter-balance of fracture toughness and hardness, the relative density was 99.8%, the Vickers hardness can reach 30.2 GPa, and the fracture toughness was 11.9 MPa·m 1/2 when the sintering temperature was set at 1700°C.
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高影响因子
JOURNAL OF ORGANOMETALLIC CHEMISTRY
·
2018
·
IF 1.946
Linna Sha,Peng Gao,Xiaobo Li,Xuefeng Bai
In this work, amorphous CoB has been uniformly coated on C 60 surfaces through a simple ball milling process. Accordingly their XRD , SEM and TEM measurements clarify their related composite structures. Especially, a C-B chemical bond has been found through its XPS measurement, which enhanced the composite's stability and electrochemical activity. And the following electrochemical experimental results demonstrated that the as-obtained C 60 /CoB composite had considerably high storage capacities of 602 mA h/g, which were much higher than those of individual C 60 and CoB. Furthermore their hydrogen storage processes and the mechanism have also been investigated.
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高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-13
·
IF 14.7
Wu Yuhan,Zhao Yuying,Yuan Qixin,Sun Hao,Wang Ao,Sun Kang,Waterhouse Geoffrey I. N.,Wang Ziyun,Wu Jingjie,Jiang Jianchun,Fan Mengmeng
Carbon nanomaterials show outstanding promise as electrocatalysts for hydrogen peroxide (H 2 O 2 ) synthesis via the two-electron oxygen reduction reaction. However, carbon-based electrocatalysts that are capable of generating H 2 O 2 at industrial-level current densities (>300 mA cm −2 ) with high selectivity and long-term stability remain to be discovered. Herein, few-layer boron nanosheets are in-situ introduced into a porous carbon matrix, creating a metal-free electrocatalyst (B n -C) with H 2 O 2 production rates of industrial relevance in neutral or alkaline media. B n -C maintained > 95% Faradaic efficiency during a 140-hour test at 300 mA cm −2 and 0.1 V vs. RHE, and delivered a mass activity of 25.1 mol g catalyst −1 h −1 in 1.0 M Na 2 SO 4 using a flow cell. Theoretical simulations and experimental studies demonstrate that the superior catalytic performance originates from B atoms with adsorbed O atoms in the boron nanosheets. B n -C outperforms all metal-based and metal-free carbon catalysts reported to date for H 2 O 2 synthesis at industrial-level current densities.
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PubMed
高影响因子
危险品化学品经营许可证（带存储）