Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 11
·3181-3189
·
IF 6.641
Xin Cheng,Lin Wang,Fengmei Gao,Weiyou Yang,Zhentao Du,Ding Chen,Shanliang Chen
The third-generation semiconductor silicon carbide (SiC) is identified as one of the vitally important candidate materials to serve as a functional unit that performs stably and reliably under harsh working conditions, with respect to its excellent piezoresistive effects and robust physical/chemical characteristics. In the current work, we put forward the fabrication of SiC nanowires with co-doped N and P elements, which were fabricated via the pyrolysis of a polymeric material. The as-grown nanowires have a typical diameter of ∼260 nm with a 10 surface. The measured transverse piezoresistance coefficient π[10] of the established SiC nanowires increased from 5.07 to −146.30 × 10−11 Pa−1 as the loading forces varied from 24.95 to 130.51 nN. Meanwhile, the corresponding gauge factor (GF) was calculated up to ca. −877.79, which is higher than the values for all SiC nanostructures ever reported. The mechanism concerning the giant negative piezoresistance behavior of SiC nanowire is proposed. The current exploration may pave a new avenue for the development of highly sensitive and robust pressure sensors that could survive under harsh working conditions.
研究领域:
材料科学
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纳米技术
·
半导体物理
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Xinzhi Liang,Qiaolei Li,Boyang Qu,Yuxiang Qiu,Shengqi Liu,Qing Wang,Jingjing Liang,Haibing Tan,Yanfei Liu,Jinguo Li
High absorbance and high refractive index have always been obstacles to the wide application of silicon carbide ceramics in stereolithography technology. To address the problems of low curing thickness, high viscosity, and poor stability of SiC photosensitive slurry, this study developed a novel resin system with HDDA, TMPTA, DPHA, and PEG200 (volume ratio = 2:6:1:1), incorporating anti-settling agents and plasticizers to enhance the performance of the slurry. The effects of the resin system on the preparation of SiC ceramics by stereolithography were analyzed, focusing on the properties of slurry, forming precision, and mechanical properties of the green body. The optimized slurry exhibited a dynamic viscosity below 3 Pa·s, a sedimentation height (<1% in 24 hours), and a single-layer curing thickness of 85 μm. High-precision and excellent surface quality SiC mirrors were prepared by stereolithography 3D printing and sintered by reactive melt infiltration process (RMI) at 1600 ℃ in Ar 2 . The optimization strategy of SiC slurry proposed in this work provides feasibility for preparing high-precision and high-strength SiC mirrors, which is expected to promote the application of SiC ceramics in the aerospace field.
研究领域:
材料科学
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航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 29
·期 11
·1806250
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IF 13.325
Tao Yang,Shanliang Chen,Xiaoxiao Li,Xiaojie Xu,Fengmei Gao,Lin Wang,Junhong Chen,Weiyou Yang,Xinmei Hou,Xiaosheng Fang
In the present work, high-performance photodetectors (PDs) based on a single B-doped 3 C -SiC nanobelt, which are synthesized via catalyst-free pyrolysis of polymeric precursors of polysilazane, are reported. The as-built PDs have a high responsivity and external quantum efficiency of 6.37 × 10 5 A · W −1 and 2.0 × 10 8 % under 405 nm light with a power density of 0.14 mW · cm −2 at 5 V, respectively. The detectivity of the PDs is measured to be of 6.86 × 10 14 Jones. Moreover, the B-doped 3 C -SiC nanobelt PDs exhibit a long-term stability against 300 °C up to 180 days, suggesting their promising applications to be served under harsh conditions.
研究领域:
材料科学
·
光电探测
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产品关联
DOI
高影响因子
CARBON
·
2024
·
IF 10.5
Jingxiang Liu,Zhen Wang,Haoquan Hao,Qinghe Jing,Shouqing Yan,Jie Guo,Wentao Liu,Zhijiang Wang
SiC aerogels have been extensively studied for electromagnetic wave (EMW) absorption because of their tunable dielectric properties. Continuous dual-peak EMW absorption can broaden the effective absorption bandwidth (EAB); however, few SiC aerogels have been reported to exhibit this phenomenon and the mechanisms to achieve this through microstructure design remain unclear. In this study, size-tunable nanopores were constructed in SiC aerogel by a simple carbothermal reduction method, which gradually increase with increasing reaction temperature. The mechanism of the nanopore formation in SiC aerogels is also discussed in detail. The optimized SiC aerogel prepared at a reaction temperature of 1550 °C exhibited continuous dual-peak EMW absorption with a maximum EAB of 6.24 GHz (11.76–18 GHz), full Ku-band coverage, and minimum reflection loss of −32.59 dB. This continuous dual-peak EMW absorption was ascribed to the overlap of the secondary peak caused by the nanopore-induced strong dielectric resonance and the main peak caused by SiC. The results of this study will provide inspiration for the design of microstructures for continuous dual-peak absorption in EMW absorption materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 51
·期 11
·5271-5280
·
IF 2.302
Tseng Funing,Li Siyang,Wu Chaofeng,Pan Yu,Li Liangliang
Intermetallic compound ZnSb is a promising thermoelectric (TE) material with the advantages of low toxicity, abundance, and low cost; however, the relatively low figure of merit ZT and the brittleness of ZnSb limit its applications in TE devices. In this study, ZnSb/SiC nanocomposites were synthesized in order to improve both the TE and mechanical properties of ZnSb. ZnSb-based nanocomposites with x vol% SiC nanoparticles ( x = 0, 0.3, 0.5, and 0.7) were prepared by mechanical alloying and spark plasma sintering. The power factor of ZnSb/SiC nanocomposite with 0.3 vol% SiC is increased. The thermal conductivity of all ZnSb/SiC nanocomposites is decreased due to the increase of interface scattering for phonons. More importantly, the fracture toughness of the nanocomposites is enhanced due to the addition of SiC. The largest ZT value and fracture toughness are found in the sample with 0.7 vol% SiC. The maximum ZT value of 0.68 is obtained at 400 °C, which is 35 % higher than that of the reference sample without SiC. The largest fracture toughness is 0.64 MPa m 1/2 , which is 31 % larger than that of the reference sample. The experimental data demonstrate that ZnSb/SiC nanocomposites with simultaneous enhancement of TE and mechanical properties are favorable for practical TE applications.
研究领域:
材料科学
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热电材料
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无机非金属材料
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复合材料
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固态物理
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机械性能
✓ 已验证
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2019
·
IF 6.669
Lin Jiang,Yunpu Wang,Leilei Dai,Zhenting Yu,Qi Yang,Sha Yang,Deyu Jiang,Zhiyun Ma,Qiuhao Wu,Bo Zhang,Yuhuan Liu,Roger Ruan
A ZSM-5/SiC composite catalyst was synthesized and characterized by Brunauer–Emmett–Teller analysis, X-ray diffraction, and scanning electron microscopy in this study. The composite catalyst had the characteristics of ZSM-5 and SiC, and the surface of SiC grew evenly with a layer of ZSM-5. The effect of the composite catalyst on the product distribution and chemical composition in a co-pyrolysis downdraft system was investigated. In a down system with a catalytic temperature of 450 °C, a feed-to-catalyst ratio of 2:1, and a soybean-soapstock-to-straw ratio of 1:1, the proportions of alkanes, olefins, aromatics, and phenoxy compounds were 6.82%, 4.5%, 73.56% and 11.11%, respectively. The composite catalyst combined the catalytic performance of ZSM-5 and SiC, increasing the proportion of aromatics and decreasing the proportion of oxygen-containing compound in the bio-oil. Moreover, the composite catalyst maintained its activity after reusing several times.
研究领域:
能源与环境科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Shen-wei Bai,Hui Mei,Zhi-peng Jin,Shan-shan Xiao,Lai-fei Cheng
In this article, we for the first time synthesized a series of SiC@Zn 0.5 Cd 0.5 S core-shell Z-scheme nanostructure, with the thickness of the shell varies from 12 nm to 60 nm, and the excellent photocatalytic exists because of the Z-scheme heterojunction mechanism. The Z-scheme system of SiC@Zn 0.5 Cd 0.5 S core-shell structure was proven by the in situ irradiated X-ray photoelectron spectroscopy, the system separated the photo-generated electron-hole pairs, and the core-shell structure performed better photocatalytic properties than Zn 0.5 Cd 0.5 S on the hydrogen production under UV–vis light irradiation. With decreasing of the shell thickness, the transient photocurrent response of the SiC@Zn 0.5 Cd 0.5 S increased and the photoluminescence decreased, anticipating the creation, collection, transportation of electrons/holes increased, and the electrons/holes recombination suppressed. The hydrogen production rate enhanced to 334% comparing with pure Zn 0.5 Cd 0.5 S, showing the advantage of SiC@Zn 0.5 Cd 0.5 S core-shell Z-scheme heterojunction nanostructure.
研究领域:
材料科学
·
能源科学
·
光催化
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Lei Yu,Kuibao Zhang,Daimeng Chen,Baozhu Luo
TiB 2 -B 4 C composites modified by SiC W with excellent mechanical properties were prepared using hot-press sintering. The effects of SiC W content on the microstructure, densification behavior and mechanical properties were investigated. The dynamic failure behavior was analyzed through the Hopkinson Bar (SHPB) testing. The results demonstrate that the addition of SiC W can effectively refine the microstructure and simultaneously improve the mechanical properties. The TiB 2 -B 4 C composite renforced with 6 wt% SiC W exhibits a nearly full-dense microstructure and excellent mechanical properties. The relative density, flexural strength , Vickers hardness and fracture toughness can reach to 99.95 %, 724 ± 61 MPa, 19.8 ± 0.7 GPa and 6.7 ± 0.3 MPa m 1/2 , respectively. The dynamic failure behavior exhibits that the damage degree increases with elevated loading speed. Moreover, the single-peak and double-peak of the waveform correspond to the two damage degrees of "broken" and "crushed".
研究领域:
材料科学
·
力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2019
·Vol. 89
·期 3
·623-633
·
IF 1.986
An Zhimin,Ye Changshou,Zhang Rubing,Qu Qiang
Abstract A C/SiO 2 /SiC ternary aerogel was prepared from a formaldehyde–catechol/silicon source via the sol−gel method, supercritical drying, and high-temperature carbothermal reduction. The effects of different carbon/silicon molar ratios on the microstructure, chemical composition, and mechanical and shielding properties of the C/SiO 2 /SiC aerogels were investigated. The fabricated aerogels exhibited low density of 0.118–0.271 g/cm 3 , low thermal conductivity of 0.044 to 0.089 W/(m∙K) and a high specific surface area of 774 m 2 /g. The aerogel exhibited electromagnetic interference shielding effectiveness (SE) properties; the maximum SE value was 24 dB over 12.4–18.0 GHz with an absorption-dominant shielding characteristic. To improve the mechanical properties of the ternary aerogel, novel SiC w -C/SiO 2 /SiC aerogel composites were prepared by adding different contents of SiC whiskers into precursor solutions. The mechanism affecting thermal and mechanical properties of aerogel composites was investigated. This composite having high strength and low thermal conductivity had potential applications in space shuttles and reusable carrier thermal protection materials.
The fabricated C/SiO 2 /SiC ternary aerogels exhibited low density of 0.118–0.271 g/cm 3 and low thermal conductivity of 0.044−0.089 W/(m∙K). The aerogel exhibited electromagnetic interference shielding effectiveness (SE) properties; the maximum SE value was 24 dB over 12.4–18.0 GHz with an absorption-dominant shielding characteristic.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 12
·1-10
·
IF 5.479
Li Xingmei,Ding Yanjun,Ling Jiang,Yao Wenyan,Zha Lagabaiyla,Li Na,Chang Yunfeng,Wang Yong,Cai Jifeng
Forensic saliva identification represents an increasingly useful auxiliary means of crime investigations, particularly in sex crimes. Salivary bacteria detection techniques have been shown to be viable methods for identifying the presence of saliva. A one-pot method is described for the fabrication of bovine serum albumin-stabilized SiC nanoparticles (SiC@BSA NPs). The SiC@BSA NPs were conjugated to antibacterial peptide GH12 to allow for fluorometric detection and imaging of bacteria in saliva. More specifically, the nanoprobe, with fluorescence excitation/emission maxima at 320/410 nm, was used to detect the oral bacteria S. salivarius levels. The detection limit is 25 cfu·mL −1 , and the assay can be performed within 40 min. The nanoprobe was also used to detect bacteria in forensic body fluids including blood, urine, and semen. In all cases, positive results were obtained with (mixed) samples containing saliva, while other saliva samples without saliva showed negative results. Fluorescent images of S. salivarius cells were obtained by implementing a high-content image analysis system. These results suggest that this new nanoprobe can be applied to screen for forensic saliva stains.
Schematic representation of the preparation of SiC@BSA-GH12 nanoprobe for fluorometric detection and imaging of S. salivarius in saliva.
研究领域:
生物技术
·
法医学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Yao Feng,Shuyi Lai,Le Yang,Ralf Riedel,Zhaoju Yu
Polymer-derived porous Bi 2 WO 6 /SiC(O) nanocomposites were prepared by a simple mechanical mixing of Bi 2 WO 6 nanopowders with a polyorganocarbosilane, namely allylhydridopolycarbosilane (AHPCS), followed by pyrolysis of the resulting blend at 700 °C for 2 h. The Bi 2 WO 6 nanopowders were synthesized by the reaction between Bi(NO 3 ) 3 ·5H 2 O and Na 2 WO 4 and characterized by means of X-ray diffraction (XRD) and dynamic light scattering (DLS). The cross-linking and polymer-to-ceramic transformation of the physically blended Bi 2 WO 6 /AHPCS were determined by Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA). TEM studies revealed that the final ceramic composite is comprised of Bi 2 WO 6 nanoparticles homogeneously embedded in a polymer-derived SiC(O) matrix. Nitrogen sorption isothermal analysis showed the meso-macroporous feature of resultant Bi 2 WO 6 /SiC(O) nanocomposites. Finally, the porous Bi 2 WO 6 /SiC(O) composites show a high photodegradation efficiency (ca. 90%) towards a model organic dye Rhodamine B (RhB) under UV irradiation. Therefore, the synthesized ceramic composite has to be considered as a promising candidate material for purification of water contaminated with organic dyes.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Mujeeb Alam,Danping Jiang,Huan Zhang,Lei Zhang,Faiqa Nadeem,Nadeem Tahir,Chaoyang Lu,Quanguo Zhang
Photo-fermentation offers a promising roadmap for hydrogen production through their ability to harness light energy, however, its lower conversion efficiency is the major bottleneck for its realization. This study investigates the catalytic role of wideband gap nano-photocatalysts (SiC, ZnO, and SnO 2 ) in enhancing hydrogen generation from Arundo donax L. Physio-optical characteristics of SiC, ZnO, and SnO 2 nano-photocatalysts were assessed through SEM, XRD, and FT-IR which confirmed that incorporated nano-photocatalysts are spherical with uniform size distribution and there is no secondary phase. Hydrogen production experiments with varying nano-photocatalyst concentrations revealed that the maximum hydrogen yield of 104 and 98.83 mL/g was achieved with SiC and ZnO, respectively, at loading concentration of 200 mg/L, whereas 69.30 mL/g were observed with 100 mg/L of SnO 2 . The incorporation of SIC, ZnO, and SnO 2 nano-photocatalyst permitted to increase the hydrogen content in overall gas production by 41 %, 37.34 %, and 18.26 % as compared to the control group. The increase in hydrogen production is related to the enhanced e-h pair separation lifetime of SiC, confirmed from PL spectroscopy. Addition of SiC caused a longer availability of electrons that helped to increase the metabolic rate by 38 % and 40.29 % in energy conversion efficiency (ECE). ANOVA results revealed significant differences between the control and maximum values of CHP, HC%, byproducts, and ECE. Tukey pairwise comparisons showed that SiC and ZnO had non-significant differences at 200 mg/L but both significantly outperformed SnO 2 at 100 mg/L. Thus, the selection of suitable catalysts photocatalysts with enhanced e-h pair separation lifetime may offer promising prospects for sustainable energy technologies by enhancing biohydrogen production.
研究领域:
生物技术
·
可再生能源
·
光发酵
✓ 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）