Materials Research Express
·
2018
·Vol. 5
·期 5
·056305
·
IF 1.151
Xiaogang Su,Jun Wang,Bin Zhang,Wei Chen,Qilei Wu,Wei Dai,Yi Zou
Recently, owing to the radiation and interference from electromagnetic wave (EMW), the requirements of EMW absorbing materials have been increasing. Herein, a novel absorber composed of graphite nanosheets@Fe3O4 composites decorated comb-like MnO2 (GNFM) has been successfully synthesized via a facile two steps, characterized using x-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), x-ray photoelectron spectroscopy (XPS), Raman spectroscopy, vibrating sample magnetometry (VSM) and vector network analyzer (VNA). The ternary composites with enhanced microwave absorption performance are due to the complementary effects of electroconductive material (graphite nanosheets), dielectric materials (MnO2) and magnetic material (Fe3O4 nanospheres). Hence, the maximum reflection loss of GNFM/epoxy composites is up to −31.7 dB at 5.85 GHz with absorbing thickness of 4.5 mm, and the efficient frequency bandwidth below −10 dB can reach up to 4.47 GHz (11.87–16.34 GHz) at matching thickness of 2 mm. The results demonstrate that GNFM could be regarded as a novel type of microwave absorbing material.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
ELECTROANALYSIS
·
2015
·Vol. 28
·期 1
·63-68
·
IF 2.138
Jiao Wang,Xuerong Chen,Kangbing Wu,Miao Zhang,Wensheng Huang
Graphene nanosheets (GS) were prepared via ultrasonic exfoliation, and used to modify glass carbon electrode (GCE). Compared with GCE, the GS-modified GCE (GS/GCE) greatly increased the anodic stripping peak currents of Cd 2+ and Pb 2+ . Moreover, the response signals of Cd 2+ and Pb 2+ on GS/GCE further enhanced remarkably in the presence of Bi 3+ . Based on the synergistic enhancement effects of GS and Bi 3+ , a novel electrochemical sensor was developed for Cd 2+ and Pb 2+ . The detection limits were 0.35 and 0.045 μg L −1 for Cd 2+ and Pb 2+ . It was used in food sample analysis, and the accuracy was tested by ICP-MS.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2020
·Vol. 20
·期 7
·4015-4022
·
IF 1.134
Wang Baomin,Deng Shuang,Zhao Lu
Graphene nanoplates (GNPs) are carbon nanomaterials with two-dimensional structure which is easy to reunite and their dispersion is necessary before using. The existing methods for dispersion characterization mainly include UV spectrophotometry, scanning electron microscope (SEM), transmission
electron microscopy (TEM) and Atomic Force Microscopy (AFM). In this research study, sodium dodecyl benzene sulfonate (SDBS), polyoxyethylene (40) nonylphenyl ether, branched (CO890), polyvinyl pyrrolidone (PVP) and cetyltrimethyl ammonium bromide (CTAB) were used as dispersants, and ultrasonic
treatment was employed as dispersion method. Ultraviolet spectrum for GNPs showed that some errors were attained, resulting from dispersant at 274 nm characteristic wavelength of GNPs dispersions with deionized water as controlled sample. The errors could be eliminated if dispersant solution
was used as controlled sample. The microstructures of dispersed GNPs observed by SEM, TEM and AFM suggested that the GNPs were dispersed uniformly with 2.5 g/L SDBS, which showed the best dispersion effect. Raman spectrum indicated that more chaotic distribution and edge structures were achieved
after dispersion.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2018
·
IF 3.909
Conglu Zhang,Zezhi Chen,Wei Guo,Chengwu Zhu,Yajie Zou
A facile method for the fabrication of crosslinked chitosan/graphene nanoplates composite sphere (CS/GNPs) was presented. The obtained samples were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopic (XPS) and thermogravimetric analysis (TGA). The adsorption activities of CS/GNPs for methyl orange (MO) and acid red 1 (AR1) were evaluated such as the effect of pH and GNPs content, as well as adsorption kinetics and isotherms. In view of practical, the reusability of CS/GNPs was also tested. The resulting adsorption capacity for MO is 230.91 mg g −1 and 132.94 mg g −1 for AR1, respectively. After saturated adsorption, CS/GNPs can be efficiently regenerated and reused with little uptake loss. Therefore, CS/GNPs is the apromising adsorbent with non-toxic, efficient, low-cost and easy to prepare for the dye removal.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
International Journal of Environmental Science and Technology
·
2024
·
IF 3
Cheng T.,Chen C.,Wen M.,Pan F.,Zhang X.,Ma H.,Hou B.,Xin X.
Developing highly efficient and low-cost composite electrode is a crucial step to achieve hydrogen and oxygen evolution reaction from overall water splitting. Herein, a ternary composite electrode derived from coating fly ash magnetic spheres and Graphite nanosheet on the carbon cloth surface, could greatly boost hydrogen and oxygen evolution reaction. Meanwhile, the efficiencies of overall water splitting were highly enhanced. The microstructure characterizations of composite material revealed that abundant magnetite crystals were existed on the fly ash magnetic spheres surface, and the main exposed crystal plane was active Fe 3 O 4 (111). Moreover, the composite electrode exhibited remarkable catalytic activities for hydrogen and oxygen evolution reaction, with lower overpotential of 175.6 mV and 328 mV at 10 mA·cm −2 , small Tafel slope of 45.5 mV·dec −1 and 77.9 mV·dec −1 , respectively, accompanied by prominent cycle stability. The overpotentials of hydrogen and oxygen evolution reaction were increased merely after 3000 CV cycles. Moreover, the electrocatalysis reaction mechanisms conducted by Density Functional Theory calculation illustrated that the combination of both advantages of Graphite nanosheet displaying superior electron transmission capacity, and the crystal plane of Fe 3 O 4 (111) gaining excellent electrocatalytic activity, gave ternary composite noticeably improved performances toward hydrogen and oxygen evolution reactions. Specifically, it required merely 1.73 V of potential difference to onset the overall water splitting reaction. This work opens a strategy to develop low-cost, efficient and earth-abundant catalysts for water splitting, and broaden the comprehensive utilization way of coal fired fly ash.
研究领域:
材料科学
·
能源化学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Deliang Cheng,Lichun Yang,Renzong Hu,Jie Cui,Jiangwen Liu,Min Zhu
Sn-based chalcogenides are considered as one of the most promising anode materials for lithium-ion batteries (LIBs) because of their high capacities through both conversion and alloying reactions. However, the realization of full capacities of Sn-based chalcogenides is mainly hindered by the large volume variation and inferior reversibility of conversion reaction during cycling. In present work, a new ternary SnS-Mo-graphene nanosheets (SnS-Mo-GNs) composite is fabricated by a simple and scalable plasma milling method, in which SnS nanoparticles are tightly bonded with Mo and GNs. The Mo and GNs additives can effectively alleviate the large volume change of SnS upon cycling, which leads to a stable electrochemical framework. Moreover, they can significantly suppress the Sn agglomeration in lithiated SnS, which enables highly reversible conversion reaction during cycling. As anode for LIBs, the SnS-Mo-GNs composite exhibits a high initial coulombic efficiency of 86.9% (almost complete reversibility of SnS, ∼97.3%), high cyclic coulombic efficiency after initial three cycles (> 99.5%), and long lifespan (up to 600 cycles). Moreover, it also demonstrates superior electrochemical performance for sodium storage. Thus, this work demonstrates a potential anode for batteries application and provides a viable strategy to obtain highly reversible and stable anodes for lithium/sodium storage.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
C-Journal of Carbon Research
·
2025
·Vol. 11
·期 2
·31
·
IF 2.9
Wenge Xu,Kuan Lu,Huinan Li,Chen Xiong,Yang Liu,Baijun Liu
In this study, some polyethylene/graphene nanoplatelet (PE-GE) composites are successfully prepared via a melt-blending process used for thermally conductive pipes. A comparison study on the effect of different fillers (i.e., graphene nanoplatelet and aluminum oxide) on thermal conductivity is conducted. The conductivity was over 2.5 W/m·K when 30 fractions of GE were involved. Furthermore, an electron beam irradiation technology is utilized to obtain the cross-linked composite materials with excellent comprehensive performance. The relationships between thermal conductivity and filler content, and irradiation dose and gel content have been carefully investigated. Finally, a polyethylene/graphene composite with 0.72 W/m·K is used to extrude a pipe, which exhibits some attractive properties for floor heating pipes.
研究领域:
材料科学
·
热能工程
✓ 已验证
产品关联
DOI
高影响因子
Nano Materials Science
·
2024
·
IF 12.6
Qingshi Meng,Zhaoyang Xu,Yin Yu,Yikuan Li,Abdullatif Lacina Diaby,Sherif Araby
In this study, a facile method was employed to synthesize strong, yet highly elastic polyurethane-urea (PUU) with typical characteristics and 94 % optical transmittance. Graphene platelets (GNPs) were prepared and modified via a scalable and eco-friendly mechanochemical approach. The produced GNPs is at 1.6-nm thickness with high electrical conductivity of ∼950 S/m. The structure-property relations of PUU/GNP nanocomposites were comprehensively investigated through morphology and mechanical properties measurements. The strong interface and high-density hydrogen bonds between modified GNPs (M-GNPs) and PUU significantly enhanced the mechanical properties of the PUU nanocomposite. The PUU composite showed 66.7 % and 36.2 % increments in tensile and impact strengths, respectively, at 0.2 wt% M-GNPs. The reversible hydrogen bond between M-GNPs and PUU endowed the nanocomposite with self-healing properties achieving 97.8 % healing efficiency of the strength after 5 h at 120 °C. This study demonstrates the importance of surface modification and provides a simple yet robust approach for preparing high-performance and functional PUU/graphene composites.
研究领域:
材料科学
·
复合材料
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2015
·Vol. 51
·期 2
·1043-1051
·
IF 2.371
Li Chang,Xu Yi-Tao,Zhao Bo,Jiang Li,Chen Shi-Guo,Xu Jian-Bin,Fu Xian-Zhu,Sun Rong,Wong Ching-Ping
Graphene nanosheets are facilely prepared by electrochemical exfoliation of graphite in sodium tungstate aqueous solution. Through a filtration-transfer procedure and followed by heat treatment, the graphene nanosheets are deposited on the polyethylene terephthalate substrate to form electrothermal films. The graphene electrothermal films exhibit low square resistance of 159 Ω/sq, high in-plane thermal conductivity of 658 W/m/K, and excellent heat propagation with uniform temperature distribution. The steady-state temperature of the films increases from 32 to 139 °C as the applied voltage increases from 5 to 30 V. The electrothermal response of the graphene films is as fast as <20 s. The graphene film heaters also display good flexibility. Even after bending 100 times, the graphene film heaters still exhibit almost the same electrothermal performance.
研究领域:
材料科学
·
热能工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2017
·
IF 2.843
Zhuo Chen,Huadi Miao,Jiaye Wu,Yushu Tang,Wang Yang,Liqiang Hou,Fan Yang,Xiaojuan Tian,Liqiang Zhang,Yongfeng Li
The scalable production of large quantities of defect-free graphene nanosheets (GNs) with low cost and excellent properties is essential for practical applications. Despite the highly intense research of this area, the mass production of graphene nanosheets with high solubility remains a key challenge. In the present work, we propose a scalable exfoliation process for hydrophilic GNs by ball-milling-assisted supercritical CO2 exfoliation in the presence of poly(vinylpyrrolidone) via the synergetic effect of chemical peeling and mechanical shear forces. The exfoliation difficulty has been reduced due to the intercalation effects of supercritical CO2 molecules. With the ball-milling assistance, the modifier has been introduced onto the edge or/and surface of the GNs. The process results in hydrophilic GNs with little damage to the in-plane structure. The GNs can be dispersed in various solvents with a concentration of up to 0.854 mg/mL (water) and remain stable for several months.
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
Materials
·
2016
·Vol. 9
·期 2
·92
·
IF 2.728
Guangwu Zhang,Fuzhong Wang,Jing Dai,Zhixiong Huang
This study investigated the effect of silane and surfactant treatments of graphene nanoplatelets (GnPs) on the mechanical and thermal properties of silicone rubber (SR) composites. GnPs were modified with aminopropyltriethoxysilane (APTES), vinyltrimethoxysilane (VTMS), and Triton X-100, and then the pristine GnPs and functionalized GnPs were individually incorporated into the SR. Compared with the pristine GnP/SR composite, the composites reinforced with modified GnP showed better tensile strength, elongation at break, and thermal conductivity properties due to better dispersion of modified GnPs and stronger interfacial interactions between the modified GnPs and matrix. The mechanical properties and thermal conductivity of the VTMS-GnP/SR composite were comparable to the properties of the Triton-GnP counterpart, but better than that of the APTES-GnP/SR composite. In addition, the VTMS-GnP/SR composite demonstrated the highest thermal stability and crystallization temperature among the four types of composites. The remarkable improvement of mechanical and thermal properties of the VTMS-GnP/SR composite was mainly due to the covalent linkage of VTMS-GnP with SR. The VTMS treatment was a more appropriate modification of GnP particles to improve the multifunctional properties of SR.Keywords:silicone rubber;graphene nanoplatelets;functionalization;mechanical properties;thermal properties
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Storage
·
2021
·
IF 6.583
Jianghui Cheng,Guoyuan Chen,Sensen Li,Feng Hou
Phase-change materials show considerable potential for the thermal management and thermal energy harvesting of electronics and appliances. However, the utilization of phase change materials (PCMs) for high-performance thermal management is hampered by low thermal conductivity and leakage problems. Herein, we report a novel method for preparing phase change composites (PCCs) with high thermal conductivity and inhibited leakage by constructing a network of graphite nanoplatelets (GNPs) and Cu nanoparticles (100 - 500 nm) with paraffin (PW) as the functional matrix. The study results demonstrated that under loads of 22 wt% EG and 45 wt% Cu, the thermal conductivity of the PCC sample reached 34.26 W m −1 k −1 , which is a 258% increase over that of EG/PW (13.29 W m −1 k −1 ) and a 17000% increase over that of PW (0.2 W m −1 k −1 ). In addition, at ambient room temperature, the incorporation of PCCs can reduce the working temperature of a heating chip by more than 12-13 K, showing efficient and reliable thermal management performance. Skilfully designed PCCs can serve as an effective device for high energy density heat dissipation and thermal storage. The proposed method is a promising approach for preparing PCCs for use in large-scale heat storage and electronic equipment thermal management.
研究领域:
材料科学
·
热能工程
✓ 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）