JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Xiaoyin Zhang,Jirun Zou,Xinkuo Zhang,Aixiang Wei,Ningqi luo,Zhen Liu,Jiaxiong Xu,Yu Zhao
Two-dimensional (2D) ReS 2 has received widespread attention because of its unique anisotropic properties, weak interlayer interactions and broad application prospects. Therefore, the controllable and repeatable growth of 2D ReS 2 flakes is very important for studying their properties and practical applications. In this work, 2D single-crystalline ReS 2 flakes with different layer numbers were synthesized on mica substrates using chemical vapor deposition (CVD) by adjusting the distance between the mica substrate and Re source, and the growth mechanism was further discussed. The fluorescence quenching effect and surface-enhanced Raman scattering (SERS) effect of 2D ReS 2 flakes were investigated using rhodamine B (RhB), crystal violet (CV) and malachite green (MG) dye molecules as Raman probes. The results show that the fluorescence quenching effect and SERS effect of 2D ReS 2 flakes are enhanced with decreasing layer number. The lowest detection limits on monolayer ReS 2 flake substrates are 10 −10 M, 10 −9 M and 10 −8 M for RhB, CV and MG under 532 nm laser excitation, respectively. 2D ReS 2 flakes used as a sensitive SERS-active substrate have excellent uniformity and stability. The surface Raman enhancement mechanism of 2D ReS 2 flakes was discussed.
研究领域:
材料科学
·
纳米技术
·
表面化学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Fengteng Zhang,Chunhua Wang,Jiajing Zhou,Jianhui Wu,Haibin Gu,Wei Lin
Polymer sponge and carbon aerogel have received widespread attention because of their high specific surface area and controllable wettability. However, the complex manufacturing processes and non-renewable raw materials of these porous materials have limited their practical applications. Herein, we conducted the thermal chemical vapor deposition (CVD) of hydrophobic methyltrichlorosilane (MTCS) on loofah sponge (LS), which led to the formation of a novel oil-adsorbing hydrophobic MTCS-coated loofah sponge (MTCS-LS). The obtained MTCS-LS retained the interconnected 3D porous structure and robust structure stability of natural LS, while exhibited dramatically improved hydrophobicity with contact angle of 137° in the pH range of 2–12. This unique characteristic conferred MTCS-LS selective oil removal ability from water, and MTCS-LS possessed oil sorption capacity of 13 times of its dry weight and high separation efficiency (>92%). Results of the adsorption-squeezing tests proved that the excellent reversible compressibility of natural LS was maintained after the silanization modification. Compared to other known oil-adsorbing materials, the MTCS-LS displayed apparent advantage in adsorbing oils with high viscosity (e.g. crude oil). Our study provides a simple approach to exploitation of biomass in pollutants removal.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2019
·
IF 3.218
Yang Luo,Yitao Zhang,Liqin Lu,Hongxia Luo
A graphene platform electrode (GPE) was fabricated by transferring chemical vapor deposition (CVD) graphene films from copper foils to flexible polyethylene terephthalate substrates supported by polymethyl-methacrylate. l -Aspartic acid ( l -Asp) was immobilized onto the surface of GPE by electrodeposition to form a poly- l -Asp/GPE, which was characterized by scanning electron microscopy, energy dispersive spectroscopy and Raman spectroscopy. Hence, a novel poly- l -Asp modified GPE was created for the simultaneous electrochemical determination of acetaminophen (AC), epinephrine (EP) and tyrosine (TY). Cyclic voltammetry was used for investigating the electrocatalytic activity of the poly- l -Asp/GPE sensor towards the detection of AC, EP and TY in comparison with that of GPE. The simultaneous determination of AC, EP and TY was realized by the differential pulse voltammetry technique at poly- l -Asp/GPE. The broad linear ranges to AC, EP and TY were obtained by chronoamperometry, which were from 0.05 to 108.25 μM for AC, 0.025 to 123.3 μM for EP and 0.1 to 93.9 μM for TY, with detection limits (S/N = 3) of 0.011 μM, 0.006 μM and 0.31 μM, respectively. Furthermore, the as-fabricated sensor showed extraordinary stability as well as high anti-interference ability, and was utilized successfully in detecting real samples.
研究领域:
电化学
·
材料科学
·
分析化学
·
生物传感器
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2021
·
IF 3.605
Bei Liu,Peng Huang,Zhiyong Xie,Qizhong Huang
Aiming at preparing a cheap and high-performance anode material, a novel carbon-coated silicon nanowire on a surface of graphite microsphere composites was fabricated by employing a new silicon precursor via the chemical vapor deposition method. The chemical vapor deposition method could further reduce the cost and realize the large-scale preparation of silicon/graphite composites and simultaneously enhance the bonding strength between silicon and graphite. Due to the lower cost and lower requirement on equipment compared with silane, chloromethylsilane was selected to produce pure silicon as the content of carrier gas is 25 vol %. Deposited with silicon and carbon for 15 and 30 min, respectively, the carbon/silicon nanowire/graphite microsphere composites display outstanding electrochemical performance with a specific capacity of 580 mA h g–1 at a current density of 0.2 C after 100 cycles and high-rate performance of 300 mA h g–1 at 5 C. Besides, the adsorption and deposition mechanisms of silicon on a graphite surface are expounded. This new preparation process is an alternative route for promoting the practical application of silicon/graphite composites.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米技术
·
化学工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Hongwei Zhao,Lixiang Li,Yuanyuan Liu,Xin Geng,Haiming Yang,Chengguo Sun,Baigang An
A simple one-step CVD of acetonitrile vapor was successfully used to prepare nitrogen-doped ordered microporous carbon, where zeolite template was silanized to improve activity of carbon deposition into pore walls of the zeolite, CVD time was used to adjust microstructure and nitrogen containing species. XRD, N 2 adsorption isotherms, SEM, TEM and XPS were used to characterize the composition, microstructure, specific surface area (SSA)/pore distribution and chemical state of nitrogen-doped zeolite-templated carbons (N-ZTCs). Electrochemical tests were carried out to analyze the performance of samples as ORR catalyst. The results show that the N-ZTC as prepared at 750 °C with CVD time of 4 h (N-ZTC-4h) owns ordered micropores, large SSA and abundant nitrogen containing functional groups. As metal free catalyst, N-ZTC-4h exhibits high current density of ORR, good durability and excellent methanol tolerance. Good catalytic ORR performance of N-ZTC-4h is owed to a large quantity of nitrogen containing species with a high ratio of pyridinic-N and quaternary-N owning activity of ORR and the ordered microporous distribution in three-dimensions for mass transport. Easy preparation process and control method of pore structure and nitrogen containing species of N-ZTCs makes it have a big potential in developing nitrogen doped carbon based catalysts of ORR.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Particuology
·
2023
·
IF 3.5
Ming Liu,Guoqiang Shao,Pengpeng Lv,Jun Li,Qingshan Zhu
Two critical parameters: Glossiness and chromaticity space of pearlescent pigments were evaluated based on crystallinity and grain size. Both the roughness and the vertical distance evolution along the surface of deposited TiO 2 film are affected by the crystallinity. The optimal crystallinity of TiO 2 was deposited at the temperature of 350 °C. The TiCl 4 concentration effectively changed the grain size. However, the high flow rate of fluidizing gas and optimal gas–solid ratio (<0.11 m 3 /(kg h)) restricted the change of TiCl 4 concentrations in fluidized bed reactor . In this case, the grain size of the deposited TiO 2 film was about 55 nm. Depending on the grain size, the color of pearlescent pigments was adjusted by controlling the film thickness based on TiO 2 concentration. Finally, the silver pearlescent pigment with high glossiness was prepared by chemical vapor deposition method in a fluidized bed reactor.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Acta Metallurgica Sinica-English Letters
·
2025
·
IF 3.9
Sun Siyu,Zhu Shaoqiang,Zhang Xiang,Zhao Dongdong,Rong Xudong,He Chunnian,Zhao Naiqin
The rapid expansion of marine industries has created an urgent demand for advanced engineering materials with superior multifunctional performance. While Cu–Ni alloys demonstrate favorable stability and tribological characteristics, their practical applications are constrained by compromised thermal conductivity and insufficient mechanical strength due to the solid solution of a high amount of Ni in the Cu matrix. Cu–Ni matrix composites reinforced with hexagonal boron nitride (h-BN) have garnered significant attention due to their potential for tailored mechanical and thermal properties. However, challenges such as BN agglomerations in Cu–Ni matrix and poor interfacial bonding hinder their practical applications. To address these limitations, this study proposes an innovative fabrication strategy for boron nitride nanosheets (BNNSs) reinforced Cu–Ni composites by integrating the in situ synthesis of BNNSs on Cu powders via chemical vapor deposition with powder metallurgy. Benefited by the in situ strategy, BNNSs with high crystallinity distribute uniformly within the Cu matrix and have an intimate interfacial bonding without voids or other types of defects. Remarkably, the BNNSs/Cu-30%Ni composite achieves simultaneous enhancement in strength and ductility, exhibiting an ultimate tensile strength of 417 MPa and fracture elongation of 17.5%, representing 30% and 118% improvements over pure Cu–Ni alloys, respectively. This exceptional mechanical synergy originates from threefold strengthening mechanisms: grain refinement, mobile dislocation pinning, and efficient stress transfer via robust interfaces. The microstructural analysis confirms that homogenous distribution of BNNSs optimized stress distribution, mitigating strain localization in the composites. Fractographic examination demonstrates uniformly distributed dimples containing embedded BNNSs, indicative of effective crack bridging and deflection during failure. Furthermore, the composite possesses excellent corrosion resistance comparable to matrix alloys, while achieving 21.23% enhancement in thermal conductivity and 20% reduction in coefficient of friction. The scalable fabrication protocol successfully resolves longstanding challenges in BNNSs dispersion and interfacial bonding, offering a viable pathway for designing high-performance CMCs for marine applications.
研究领域:
材料科学
·
纳米技术
·
机械工程
·
化学工程
·
冶金学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Junjie Yan,Xiumei Wu,Qidong Liu,Yunping Li,Shu Yu
Silicon oxycarbide (SiOC) coatings were prepared through isothermal chemical vapor co-deposition by using two precursors of hexamethyldisilane (HMDS) and tetraethyl orthosilicate (TEOS). The microstructure, composition and the protectiveness on C/C composite against oxidation of the coatings prepared at temperatures ranging from 1423 K to 1563 K and pressures ranging from 500 Pa to 1200 Pa were investigated, respectively. After oxidation, cracks and defects were formed in the coatings of all conditions due to the volume shrinkage of amorphous SiO 2 crystallization and the mismatch of thermal expansion coefficient (CTE) between SiOC coatings and substrate. The most oxidation-resistant SiOC coating was obtained at 1563 K and 500 Pa, which exhibited the lowest weight loss rate of 4.87 % after 12 h of oxidation at 1673 K in air condition.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2025
·
IF 4.6
Lu Wang,Bing-Han Sun,Jian-Jun Yu,Jian-Li Li
In the work, the method of chemical vapor deposition reaction of CO and gaseous MoO 3 was proposed to prepare ultrafine Mo 2 C. Different technologies, such as XRD, FESEM, TEM, laser particle size analysis and Brunauer-Emmett-Teller method, as well as thermodynamic software FactSage 8.3, were adopted to analyze the experimental data. The results revealed that increasing the flow-rate of reduction‑carbonization regent CO ( V outer (CO)) was beneficial for the formation of Mo 2 C; while when V outer (CO) exceeded the threshold value, single-phase Mo 2 C cannot be prepared. The optimal conditions for preparing ultrafine Mo 2 C were given as T = 1223–1323 K, V outer (CO) = 900 mL/min, and V inner (Ar) = 100 mL/min; herein, V inner (Ar) means the flow-rate of carrier gas Ar. Under these conditions, the preparation procedures of Mo 2 C followed the pathways of MoO 3 → (MoO 3 ) n ( n = 2, 3, 4, and 5) → MoO 2 → Mo 2 C. The study also discovered that the as-prepared Mo 2 C kept the overall morphology as the intermediate product MoO 2 with a hexagonal-platelet structure; however, due to the removal of oxygen and the decrease of products' molar volume, the prepared Mo 2 C exhibited a rougher and more porous micro-structure with a specific surface area up to 36.7 m 2 /g. This work may provide an important methodical guidance for the scale-preparation of ultrafine Mo 2 C.
研究领域:
材料科学
·
化学工程
·
纳米材料
·
无机合成
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2021
·Vol. 11
·期 5
·523
·
IF 2.881
Cong Wang,Chengchen Xu
Chemical doping of boron atoms is essential to modify the electrical properties of graphene films. The synthesis of large-scale boron-doped graphene with high uniformity and good electrical properties is still a great challenge. To improve the quality and uniformity of boron-doped graphene, we introduced several methods to engineer the surface of the copper catalyst for chemical vapor deposition. The ethylic acid treatment proved to be more effective to remove surface impurities than the hydrochloric acid treatment. Moreover, electrochemical polishing showed the best performance in reducing the impurities and surface roughness in all the methods. The sheet resistance and carrier mobility of the boron-doped graphene film grown on the electropolished copper foil were 2.35 kΩ/□ and 1.15 × 103cm2·V−1·s−1at room temperature, respectively. Our results suggest that the boron-doped graphene grown on the electropolished copper catalyst possesses a high carrier mobility and less structural defects, which makes it suitable for application in optoelectronics.Keywords:boron-doped graphene;surface engineering;electrochemical polishing
研究领域:
材料科学
·
物理化学
✓ 已验证
DOI
高影响因子
Discover Nano
·
2023
·Vol. 18
·期 1
·1-13
·
IF 0
Yang Weihuang,Mu Yuanbin,Chen Xiangshuo,Jin Ningjing,Song Jiahao,Chen Jiajun,Dong Linxi,Liu Chaoran,Xuan Weipeng,Zhou Changjie,Cong Chunxiao,Shang Jingzhi,He Silin,Wang Gaofeng,Li Jing
Large-area, continuous monolayer WS 2 exhibits great potential for future micro-nanodevice applications due to its special electrical properties and mechanical flexibility. In this work, the front opening quartz boat is used to increase the amount of sulfur (S) vapor under the sapphire substrate, which is critical for achieving large-area films during the chemical vapor deposition processes. COMSOL simulations reveal that the front opening quartz boat will significantly introduce gas distribute under the sapphire substrate. Moreover, the gas velocity and height of substrate away from the tube bottom will also affect the substrate temperature. By carefully optimizing the gas velocity, temperature, and height of substrate away from the tube bottom, a large-scale continues monolayered WS 2 film was achieved. Field-effect transistor based on the as-grown monolayer WS 2 showed a mobility of 3.76 cm 2 V −1 s −1 and ON/OFF ratio of 10 6 . In addition, a flexible WS 2 /PEN strain sensor with a gauge factor of 306 was fabricated, showing great potential for applications in wearable biosensors, health monitoring, and human–computer interaction.
研究领域:
材料科学
·
纳米技术
·
电子学
·
传感器
✓ 已验证
DOI
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2018
·
IF 3.235
Danyu He,Pu Zhang,Shehong Li,Hongxia Luo
A novel free-standing graphene platform electrode (GPE) was prepared directly by transferring a chemical vapor deposition (CVD) graphene film from Cu foils to polyethylene terephthalate substrates with the aid of polymethyl-methacrylate. AuPt hybrid nanoparticles (AuPtNPs) and l -cysteine ( l -Cys) were electrodeposited simultaneously on the GPE. The successful formation of AuPtNPs-Cys/GPE was confirmed by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), Raman microscope and X-ray diffraction (XRD). The electrocatalytic activity and enhanced conductivity of AuPtNPs-Cys/GPE sensor was evaluated by determining epinephrine (EP) in the presence of ascorbic acid (AA), dopamine (DA), uric acid (UA) in phosphate buffer solution by various techniques, including cyclic voltammetry (CV), differential pulse voltammetry (DPV) and chronoamperometry . Further, the proposed sensor not only achieved the selective determination of EP, but also separated the voltammetric signals of AA, DA, EP and UA with potential differences of 266, 250 and 183 mV, respectively. The amperometric current response was increased linearly with increasing EP concentration in the range of 0.2 to 1000 μM with a detection limit of 0.0157 μM (S/N = 3). In addition, the as-obtained sensor delivered extraordinary stability, reproducibility, as well as high resistance to interferences, and was successfully utilized in determining real samples.
研究领域:
分析化学
·
材料科学
·
生物医学工程
✓ 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）