ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Yuliang Jiang,Zhaoyin Wang,Zhihui Dai
A novel nanocomposite, silicon–carbon-based dots@dopamine (Si-CDs@DA) was prepared using (3-aminopropyl) triethoxysilane, glycerol, and dopamine as raw materials via a rapid microwave-assisted irradiation. This type of Si-CDs@DA exhibited ultrabright fluorescence emission (quantum yield of 12.4%) and could response to Ag+ selectively and sensitively. Moreover, the obtained Si-CDs@DA can be further applied in sensing intracellular Ag+ and cell imaging, because of its photostability, salt stability, and low cytotoxicity. This study provides a simple and efficient approach for preparing novel Ag+ fluorescent probes, which could expand the application of carbon nanomaterials in designing related biosensors.
研究领域:
纳米材料
·
生物传感
·
细胞生物学
✓ 已验证
DOI
PubMed
高影响因子
DIAMOND AND RELATED MATERIALS
·
2020
·
IF 2.65
Yanxi Qin,Rongyu Li,Wei Mi,Wei Shi,Baoying Lu,Xili Tong
Aqueous catalytic phenol has been explored using Pd 7 P 3 /SiC catalysts in the presence of H 2 . Palladium phosphide was prepared by oleoamine reduction and supported on silicon carbide. The physicochemical properties of the catalyst were characterized by inductively Coupled Plasma Emission Spectrometer (ICP-MS), X-ray diffractometer (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The results show that palladium phosphide is successfully supported on silicon carbide, and the dispersion is relatively uniform with the particle size is about 6–9 nm. Under the same catalytic conditions, a catalyst with a loading of 2.4 wt% exhibits the best activity. When the temperature is 40 °C, the initial pressure is 5 bar, the conversion of phenol can reach more than 99%, and the selectivity of cyclohexanol reaches 94% after 2 h reaction.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Liang-Jun Yin,Chao Cai,Hui Wang,Yu-Jie Zhao,Hao Van Bui,Xian Jian,Hui Tang,Xin Wang,Long-Jiang Deng,Xin Xu,Ming-Hsien Lee
Superior thermal quenching and degradation of phosphors are required for long lifetime lighting devices, such as light-emitting diodes, which can be realized through composition modification. Here, Al-N bonds in AlON: Eu 2+ phosphors are substituted by higher bond order of Si-C. Photoluminescence (PL) results show thermal quenching (at 150 °C) and thermal degradation (after 600 °C treatment in air) are improved by 5% and 8% with a small decrease of PL intensity in 5% SiC doped AlON: Eu 2+ phosphor. To explain these observations, first-principles computational study was performed to understand the Si and C configuration in AlON:Eu 2+ . The calculations reveal that Si and C elements are not randomly distributed in AlON lattice. It was found that Si prefers occupying tetrahedral sites (Td-Si) and the insertion of C in Td-Si is always energetically favorable, which results in the formation of SiC 4 and SiNC 3 clusters. Thus, the Al-N substitution by Si-C induces a stronger local structure, which accounts for the emission redshift and better thermal stability.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Sustainable Energy & Fuels
·
2020
·Vol. 4
·期 5
·2583-2592
·
IF 5.503
Yong Wang,Xiaolan Wang,Hong Jin,Yu Bai,Hui Xu
Using silicon/carbon composites is one of the most attractive strategies to improve the anode performance for lithium ion batteries. Nevertheless, the adhesion between silicon and carbon can be hardly maintained. It is critical to enhance the silicon/carbon structure stability. Here, we report a facile procedure to design a stable Si@CA@RH anode. Silicon nanoparticles are encapsulated with citric acid that can buffer the volume change and maintain the connection with the carbon structure via ester bonds. A rice husk derived carbon skeleton is used to facilitate the electronic conductivity network as well as the structural stability of the electrode. The hierarchically porous carbon matrix provides sufficient space to accommodate the volume expansion of Si and shortens the lithium-ion transportation distance. Hence, the Si@CA@RH electrode exhibits a stable capacity of 2126 mA h g−1 and high coulombic efficiency of 99.5% after 250 cycles. This strategy gives a perspective on alternative design of integrated carbon/silicon anode materials for high-performance Li-ion batteries.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2021
·
IF 8.067
Chaoye Zhu,Yao Zhang,Ziqiang Wu,Zhihong Ma,Xinli Guo,Fuyi Guo,Jiakun Zhang,Yushu Li
Both silicon and tin are promising anodes for new generation lithium ion batteries due to high lithium storage capacities (theoretically 4200 mA h g −1 and 992 mA h g -1 , respectively). However, their large volumetric expansions (both are above 300 %) usually lead to poor cycling stability. In this case, we synthesized closely packed Si@C and Sn@C nano-particles anchored by reduced graphene oxide (denoted as Si@C/Sn@C/rGO) by the way of solution impregnation and subsequent hydrogenation reduction. Sn particles with a diameter of 100 nm are coated by carbon and surrounded by Si@C particles around 40 nm in average diameter through the high-resolution transmission electron microscopy. Expansions of Si and Sn are alleviated by carbon shells, and reduced graphene oxide sheets accommodate their volume changes. The prepared Si@C/Sn@C/rGO electrode delivers an enhanced initial coulombic efficiency (78 %), rate capability and greatly improved cycle stability (a high reversible capacity of nearly 1000 mA h g −1 is achieved after 300 cycles at a current density of 1000 mA g −1 ). It can be believed that packing Sn@C nano-particles with Si@C relieves the volume expansion of both and releases the expansion stresses. Sn@C particles enhance anode process kinetics by reducing charge transfer resistance and increasing lithium ion diffusion coefficient . The present work provides a viable strategy for facilely synthesizing silicon-tin-carbon composite anode with long life.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 22
·7127-7141
·
IF 7.393
Shuaishuai Cheng,Xiaoyuan Duan,Xiaoqing Liu,Zhiyi Zhang,Dong An,Guizhe Zhao,Yaqing Liu
With the development of electronic devices, it is becoming increasingly important for thermal interface materials (TIMs) to efficiently and quickly remove the heat generated. However, due to the high thermal resistance of the interface between fillers as well as filler and matrix, this seriously affects the transfer of phonons at the interface. Herein, silicon carbide nanowires (SiCnw) were bonded to rubber with a strong interaction force by grafting small molecular functional groups on the surface of SiCnw, which could serve as a phonon expressway. Secondly, a three-dimensional (3D) functional SiCnw/natural rubber (3D f-SiCnw/NR) TIM with a highly oriented and interconnected thermal conductive network was successfully prepared through the freeze-casting method. The thermal conductivity of the composites could reach 0.856 W m−1 K−1 when the filler content was 8.89 vol%. Meanwhile, the excellent heat transfer ability, wonderful electrical insulation performance and good mechanical properties provided better reliability for the application of f-SiCnw/NR composites in thermal management. It is more valuable that this strategy provides a powerful way to prepare high performance rubber-based thermal-management materials.
研究领域:
材料科学
·
热管理技术
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Wei Zhou,Yuting Zhang,Yang Li,Yanzi Gou,Xiaobing Zhou
A novel ternary layered ceramic of Y 3 Si 2 C 2 was successfully in-situ synthesized on the surface of home-made third-generation KD-SA SiC fiber for the first time by molten salt method aimed at improving the electromagnetic wave (EMW) absorption. After in-situ synthesis of Y 3 Si 2 C 2 ceramic layer on SiC fiber (SiC f /Y 3 Si 2 C 2 ), significantly improved EMW absorption performance was obtained. The minimum reflection loss (RL min ) of −16.97 dB was reached in SiC f /Y 3 Si 2 C 2 composites at the thickness of only 2.19 mm, and the effective absorption bandwidth (EAB) was up to 5.44 GHz (12.56–18 GHz) at a thin thickness of 2.64 mm. The improvement in EMW absorption of SiC f /Y 3 Si 2 C 2 is mainly attributed to enhanced dielectric loss and conduction loss resulting from increased heterogeneous interfaces and multiple reflections and scattering originating from net structure. The SiC f /Y 3 Si 2 C 2 could be a promising EMW absorber for application in high-performance EMW absorbing materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 31
·13301-13307
·
IF 3.288
Wei Qi,Mengjie Li,Long Zhao
Silicon carbide nanocrystals have been widely researched and applied in bio-imaging, drug delivery, dental implants and relative fields. However, the challenges in the synthesis technology of silicon carbide nanocrystals are still restricting their practical applications. Therefore, we investigated the fabrication of photoluminescent (PL) silicon carbide quantum dots (SiC QDs) through ionic liquid-based microemulsions combined with a radiation technique. The high steady blue PL SiC QDs were obtained with the largest quantum yield of 12.39% and an indirect energy gap of about 5.14 eV. Radiation doses and silane coupling agent concentrations had almost no effect on the size and PL properties of SiC QDs, but strongly affected their quantum yields and lifetimes. The droplet size of ionic liquid-based microemulsions showed great potential applications in regulating the size and PL properties of SiC QDs. Through this work, one simple, high-rate, clean, scalable strategy has been provided for synthesizing PL SiC QDs, which is meaningful to promote the practical applications of SiC QDs in the future.
研究领域:
材料科学
·
生物医学工程
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Minghui Zhang,Xiaoyan Chen,Jiangman Sun,Zhen Qin,Biao Zhao,Jinglong Li,Yue Xing,Xiubing Liang,Han Zhu,Kai Pan
Developing semiconductor ceramic materials with lightweight, outstanding stability, and high-performance electromagnetic wave (EMW) absorption are attractive for harsh environments. Due to thermal and chemical stability, designable microstructure, and tunable dielectric property , microstructured silicon carbide (SiC) ceramics offer promising potential as excellent EMW absorbers while limited by the scarce fabricating methods. Here, a simple coaxial electrospinning technology and the high-temperature calcination process are developed for the first time to fabricate hollow SiC microspheres (HSCMs) for EMW absorbers. Owing to the sizeable SiC-free space interface in the shell and internal void, the inner hollow structure also endows HSCMs with excellent EMW absorbing properties. By comparing with the composite of 40 wt% solid SiC microspheres (SSCMs)/paraffine, it is found that the 40 wt% HSCMs/paraffin composite exhibits superior dielectric properties and a minimum reflection loss (RL) value of − 61.6 dB at 7.7 GHz and 3.4 mm thickness, associated with the most considerable adequate absorption bandwidth of 4.9 GHz (from 12.6 to 17.5 GHz) at 1.9 mm thickness. This work gives rise to a handy method for fabricating hollow SiC with lightweight and high-efficiency EMW absorption. It will potentially boost the development of next-generation EMW absorbers for harsh environment applications.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Bolei Shen,Haojing Zhang,Yingjie Wu,Hao Jiang,Yanjie Hu,Chunzhong Li
The demand for lithium compensation materials is becoming urgent as energy density requirements increase. As next-generation anodes, mixed silicon and carbon (Si–C) materials are limited by low efficiency in the first cycle owing to the formation of a solid electrolyte interphase film. However, most compensation materials are water- and oxygen-sensitive and exhibit low electrochemical activity and decomposition efficiency. In this study, water- and oxygen-stable lithium oxalate (Li2C2O4) was developed to enhance the capacity and cycle-life of the lithium-ion battery. Various metal oxides were screened to improve the electrochemical activity of Li2C2O4. Co3O4 exhibited the strongest catalytic performance, and the catalytic mechanism of Co3O4 on Li2C2O4 was studied by density functional theory. Ultrasonic atomization drying was used to combine Co3O4 quantum dots (Co3O4-QDs) with Li2C2O4 for improved efficiency. The electrochemical activity of the modified Li2C2O4 improved, and the decomposition voltage decreased from 4.65 to 4.0 V. The modified Li2C2O4 exhibits catalytic activity, and it can be used in LiFePO4, which has weak catalytic activity; the decomposition efficiency in the LiFePO4 system increased from 34.16 to 99.10%. In the Si–C//LiFePO4 full battery system, the first cycle discharge capacity increased from 80 to 160 mA h g–1; the lost capacity of the first cycle was fully compensated for. Additionally, the CO2 produced by Li2C2O4 decomposition could inhibit the decomposition of the electrolyte, further improving the cycle performance of the battery.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2020
·
IF 6.444
Wang Zhi-Guo,Yang Yu-Liang,Lan Ri-Tong,Dai Kun,Duan Hong-Ji,Lei Jun,Xu Ling,Xu Jia-Zhuang,Li Zhong-Ming
Excellent thermal management capacity is urgently required to tackle booming heat flux density of electronic devices. As an attractive building block in constructing functional materials, graphene oxide (GO) is plagued with low thermal conductivity (TC). In this contribution, we constructed aligned hybrid network in the GO film to ameliorate multifaceted performance. Silicon carbide nanowires (SiCNWs) were first functionalized by polydopamine (PDA) to improve the dispersed ability and the interfacial interaction with GO sheets. Subsequently, effective thermally conductive pathways were paved by oriented arrangement of SiCNW@PDA and GO sheets. The resultant composite film presented excellent in-plane TC of 29.4 W/mK and ultrahigh anisotropy ratio of ~12,800% by introducing 80 wt% SiCNW@PDA. In addition, temperature stability and fatigue reliability were also favourable. More intriguingly, flame resistance was integrated in the composite films due to incorporation of noncombustible SiCNW framework. Our work offers a paradigmatic means to fabricate multifunctional thermal management materials.
研究领域:
材料科学
·
热管理技术
✓ 已验证
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 34
·19729-19739
·
IF 3.049
Zhenting Yu,Yunpu Wang,Lin Jiang,Leilei Dai,Yuhuan Liu,Roger Ruan,Pingwei Wen,Yunfeng Zhao,Dengle Duan,Rongge Zou,Qiuhao Wu,Yanzhi Li
This study reports the synthesis of a SiC-MCM41 composite catalyst by a microwave-assisted hydrothermal process and the composite catalyst had the characteristics of MCM41 and SiC, and the surface of SiC grew evenly with a layer of MCM41 after characterization of the catalysts by various means (X-ray diffraction, Brunauer–Emmett–Teller, scanning electron microscopy). The catalyst was applied in the pyrolysis of waste oil to investigate how it influences the bio-oil component proportion compared with no catalyst, only SiC, only MCM41 catalysis and the catalytic effect was also investigated at different temperatures and different catalyst to feed ratios. In a downdraft system with a pyrolysis temperature of 550 °C, a catalyst to feed ratio of 1 : 2, and a catalytic temperature of 400 °C, 32.43% C5–C12 hydrocarbons and 41.10% mono-aromatics were obtained. The composite catalyst combined the catalytic effect of SiC and MCM41 because it increased the amount of C5–C12 hydrocarbons and decreased the amount of oxygen-containing compounds in bio-oil. After repeated uses, the composite catalyst still retained the catalytic properties.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）