Materials
·
2020
·Vol. 13
·期 4
·933
·
IF 3.057
Yuexuan Li,Yugang Duan,Chengmeng Wang
Graphene has been regarded as one of the most promising two-dimensional nanomaterials. Even so, graphene was still faced with several key issues such as impedance mismatching and narrow bandwidth, which have hindered the practical applications of graphene-based nanocomposites in the field of microwave absorption materials. Herein, a series of Si-modified rGO@Fe3O4composites were investigated and fabricated by a simple method. On one hand, the degree of defects in graphene carbon could be tuned by different silane coupling reagents, which were beneficial to enhancing the dielectric loss. On the other hand, the spherical Fe3O4nanoparticles provided the magnetic loss resonance, which contributed to controlling the impedance matching. Subsequently, the electromagnetic absorption (EMA) properties of Si-modified rGO@Fe3O4composites with poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-co-HFP) were investigated in this work. As a result, the Si(2)-rGO@Fe3O4/PVDF-co-HFP composite exhibited the excellent EMA performance in the range of 2–18 GHz. The maximum reflection loss (RLmax) reached −32.1 dB at 3.68 GHz at the thickness of 7 mm and the effective absorption frequency bandwidth for reflection loss (RL) below −10 dB was 4.8 GHz at the thickness of 2 mm. Furthermore, the enhanced absorption mechanism revealed that the high-efficiency absorption performance of Si(2)-rGO@Fe3O4/PVDF-co-HFP composite was attributed to the interference absorption (quarter-wave matching model) and the synergistic effects between Si(2)-rGO@Fe3O4and PVDF-co-HFP. This work provides a potential strategy for the fabrication of the high-performance EMA materials.Keywords:absorbing materials;Si-modified rGO@Fe3O4/PVDF-co-HFP composites;dielectric loss;magnetic loss;electromagnetic properties
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2015
·
IF 7.435
Wenjun Liu,Jingyu Cai,Zhengxin Ding,Zhaohui Li
TiO 2 /RGO composite aerogels with TiO 2 nanostructures grown on interconnected three-dimensional RGO porous networks were fabricated via a facile one-pot hydrothermal method. The as-obtained composite aerogels show controllable and continuously tunable surface wettability from super-hydrophobic to super-hydrophilic depending on the amount of incorporated TiO 2 . The TiO 2 /RGO composite aerogels with varied surface wettability can selectively degrade different pollutants in aqueous systems. The capability of forming the TiO 2 /RGO aerogels with tunable surface wettability for selective photocatalysis is important since such materials are especially useful in some systems which contain extremely poisonous contaminants in low concentration together with large quantity of un-poisonous chemicals.
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
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Ying-Ming Li,Yi-Ran Li,Wen-Juan Hu,De-Yi Wang
To meet the increasingly serious challenges of electromagnetic pollution and fire hazards, highly efficient electromagnetic absorbing materials with good flame retardancy have been accurately developed. A complex high-performance electromagnetic absorber was designed by doping graphene oxide heterostructures (including zero-dimensional nanoparticles and two-dimensional graphene) containing cobalt, nickel and iron oxyhydroxide through the coordination effect. When 20 wt% CNFO@rGO was incorporated into paraffin, the minimum reflection loss (RL) reached -51.6 dB at a thickness of 3.5 mm, showing a high electromagnetic absorption efficiency. It was concluded that the excellent impedance matching, the best dielectric loss and the higher magnetic loss caused by the heterostructure combined with the electromagnetic parameters, Cole-Cole semicircle, impedance matching (Z) and attenuation coefficient resulted in excellent electromagnetic wave absorption performance. Moreover, the peak heat release (PHRR) and heat release rate (HRC) decreased by 55.5% and 55.1%, respectively, when 10 wt% CNFO@rGO was incorporated into the epoxy resin (EP), indicating enormous potential for the enhancement of flame-retarding electromagnetic absorbing materials.
研究领域:
材料科学
·
电磁学
·
阻燃材料研究
✓ 已验证
产品关联
DOI
高影响因子
Journal of Sulfur Chemistry
·
2024
·
IF 2.1
Yuyang Wang,Tao Ge,Xinju Zhan,Song Liu,Yulu Wei,Yueyue Qiao
The incomplete reduction of graphene oxide (GO) yields reduced graphene oxide (rGO), characterized by a zero band gap and intrinsic layer stacking, thus constraining its practical utility across diverse domains. Fortunately, this challenge can be effectively addressed by employing a suitable substrate for the fabrication of MoS2/rGO heterostructures. Nanocomposites of MoS2/reduced graphene oxide (MoS2/rGO-700W and MoS2/rGO-560W) were synthesized using MoS2 and GO solutions as starting materials through microwave-assisted synthesis with microwave power treatments of 700W and 560W, respectively. Structural characterization results reveal that the particle size of MoS2 within the composites is notably smaller compared to that of pure MoS2. The MoS2/rGO-700W composite demonstrates a more homogeneous dispersion of MoS2 and features a well-developed hierarchical porous structure with increased pore volume and specific surface area. The MoS2/rGO-700W composite demonstrates elevated ID/IG ratio, C/O ratio and C = C peak area, suggesting that increased microwave power enhances the removal of oxygen-containing groups from rGO. This process significantly restores the extended conjugated structure of graphene, thereby offering enhanced conductivity at the MoS2 interface. Furthermore, the proposed strategy holds considerable theoretical value and provides significant insights for the development process of novel MoS2-based composite electrode materials.
研究领域:
材料科学
·
能源存储
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2023
·
IF 2.8
Lei Xia,Yi Lu,Yuan-Zhou Li,Zhi-Yi Hu,Xiao-Yu Yang
Photocatalytic hydrogen production from seawater has great prospects for generating clean energy from renewable resources. We designed a TiO 2 -rGO-Cu photocatalyst that possesses a pathway for directed electron transfer from nitrogen-doped TiO 2 to rGO and then to Cu nanoparticles, which leads to efficient electron-hole pairs separation. Results show that TiO 2 -rGO-Cu has a hydrogen production rate of 16.08 mmol h −1 g −1 in simulated seawater, which is as much as 25 times higher than that of TiO 2 . The mechanism for a highly efficient directional interfacial electron transport is proposed. The strategy could be effective for designing new photocatalysts for hydrogen production from seawater.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Wenyan Huang,Yinong Zheng,Qianwen Tao,Yeqi Zhu,Siqi Lan,Ying Yu,Shengjian Mao,Zhichao Xue,Rongqian Yao
High flight speed of hypersonic vehicles will push thermal insulation composites to achieve balanced enhancement of high porosity with increasing load-bearing capability. Herein, hierarchically porous SiC(rGO) polymer-derived ceramics (PDCs) with lightweight, heat-insulating, anti-ablative and tough engineered merits, are designed from polycarbosilane-vinyltriethoxysilane-graphene oxide precursors by re-pyrolysis/graphite-assisted decarburization . Graphite pore-forming agents tightly coupled with SiO x C y /C free (rGO) by C-dangling bonds, can inhibit SiO x C y decomposition, increase ceramic network disorder and expedite concurrent removal of C free . SiO 2 generated from Si-dangling oxidation bonding, efficiently densifies framework to retain mechanical performances, and meanwhile creates more interfaces to enhance phonon scattering. Such structure similar to nodular cast iron confers low thermal conductivity (0.11 W·m -1 ·K -1 ), particularly, fully preserves good compressive strength (5.4 MPa) for SiC(rGO) 40% . Under both cyclic butane flame ablation (∼1300 °C) and long-term oxidation for 7200 s, self-healing effect of SiO 2 imbues products with good structural integrity, shedding light on the opportunity to apply any thermal protection system.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Yuting Zhong,Zhirui Wu,Xiaoguang Liu,Ling Li
Establishing strong interfacial interactions through novel support materials and poly-metallic alloys is an effective method to boost the catalytic performance for electrocatalytic alcohols oxidation . Herein, PdBiMn particles embedded pleated layered rGO-modified novel prismatic Al-based metal-organic framework (Al 2 (OH) 2 (H 2 O) 2 [C 10 O 8 H 2 ] or MIL-118A) composites were fabricated via a simple hydrothermal-impregnation reduction approach and employed in ethylene glycol oxidation reaction (EGOR). It is noticed that the strong electronic effects of PdBiMn alloys and the strong adsorption of oxygened species could alter the electronic structure of Pd and facilitate the removal of toxic species, while the rGO/MIL-118A strongly fixes abundant PdBiMn alloys, providing more active sites and accelerating the interfacial electron transfer . Impressively, the forward peak current density of trimetallic PdBiMn@rGO/MIL-118A catalyst is 239.62 mA cm −2 , it is almost 8.86 times greater than that of Pd/C. Additionally, after 3600 s chronoamperometry test, the current density of trimetallic catalyst retains about 75.54% of the initial current density.
研究领域:
材料科学
·
电化学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2025
·
IF 5.1
Jun Liu,Jiayin Li,Yao Chen,Xin Tan,Chun Yang
The abnormal contain of uric acid (UA) and tryptophan (Trp) in body could cause the liver and kidney function decline. The simultaneous detection of UA and Trp for early prevention of these liver and kidney diseases is significant. This study had developed the α-Fe 2 O 3 /reduced graphene oxide (rGO) for modification of the glassy carbon electrode (GCE) in (UA) and (Trp) detection. α-Fe 2 O 3 /rGO composite was synthesized through hydrothermal-calcination method. The optimal electrochemical conditions, including the pH values, scan rate, and accumulative parameters, were discussed for demonstrating the feasibility. Moreover, this α-Fe 2 O 3 /rGO/GCE presented wide linear relationships (0.01–900 μM) and low detection limits (UA (3.56 nM) and Trp (16.4 nM)). The DFT theoretical calculation revealed that the enhanced performance is mainly due to the high electrocatalytic property of α-Fe 2 O 3 nanotube, high conductivity of rGO, and interaction effect between target biomolecule and modified electrode surface. Finally, the approving results were also acquired in detection of practical UA and Trp samples by α-Fe 2 O 3 /rGO modified GCE. The results indicate that α-Fe 2 O 3 /rGO could provide a new and highly advantageous approach for detection of UA and Trp.
研究领域:
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Ruoshan Jin,Zichun Xiao,Zhanhui Jia,Jiawu Cui,Chengyong Shu,Yu Bai,Wei Tang,Yuping Wu
It is still a huge challenge for lithium metal batteries (LMBs) with high energy density for practical application due to the intractable dendrite-growth issue triggered by inhomogeneous Li deposition as well as the unstable solid electrolyte interphase (SEI). For the purpose of constructing a dendrite-free Li metal anode, herein we designed and fabricated a functional separator (ZIF-L/rGO@PP) by facile vacuum infiltration in order to realize the effective regulation of ion transport. The nanochannels in ZIF-L with polar functional groups promote the uniform Li+ flux and the restricted migration of anions, while the rGO lamella endows the coating with good flexibility by reinforcing the interlayer bonding interactions. Based on the synergistic effects of ZIF-L and rGO, the functional separator exhibited superb electrolyte wettability and a high Li+ transference number of 0.66, ensuring the uniformity of Li+ transmission and thus induced a robust interface of the Li anode. Consequently, the cells with ZIF-L/rGO@PP separators delivered prolonged lifespan over 700 h with a small overpotential of less than 40 mV at 2 mA cm–2. More importantly, the employment of the separator enables Li||NCM811 full cell with enhanced cycling stability even under the limited N/P ratio of 2.5.
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 CLUSTER SCIENCE
·
2019
·Vol. 31
·期 2
·337-346
·
IF 2.125
Zhao Chenyu,Jiao Junfeng,Zhou Wencui,Zhang Yong,Liu Han,Yang Xiaogang,Pandi Boomi,Cai Yurong
In this study, a new HAP/rGO/AuNPs-AO modified carbon electrode (GCE) was fabricated for amperometric detection of ascorbic acid. The HAP/rGO/AuNPs composite was prepared by one-step hydrothermal method. The large specific surface area, strong adsorption and excellent biocompatibility of HAP nanowires enabled fast, stable and accurate detection of ascorbic acid. As array of quantum dot, AuNPs had strong electrocatalytic activity in addition to good adsorption to enzymes, which could provide high sensitivity and low limit of detection for biosensor. Then rGO ensured that current signal could be quickly transferred from the composite to electrode. Under the optimum conditions, the prepared biosensor demonstrated a wide linear range from 0.39 to 36 mM (R 2 = 0.99845), a low limit of detection (3.39 μM, S/N = 3) and a high sensitivity (15.949 mA moL −1 ) with good selectivity, stability (10.8%) and repeatability (3.9%), which might providing a reasonable and reliable way for ascorbic acid detection.
研究领域:
生物化学
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Yu-Ying Xin,Li-Hong Liu,Yan Liu,Zhao-Peng Deng,Xiao-Li Cheng,Xian-Fa Zhang,Ying-Ming Xu,Li-Hua Huo,Shan Gao
The development of electrochemical dopamine (DA) sensor with anti-interfering ascorbic acid and uric acid is challenging due to the presence of their overlapping electrical signals. Herein, MoS 2 nanoflower assembled from ultrathin nanosheets were uniformly loaded on rGO substrate through one-step hydrothermal reaction. Then, the composite (MoS 2 /rGO) was modified on the surface of glassy carbon electrode (GCE) by a drop coating method, successfully assembling non-enzymatic electrochemical sensor for ultra-selective DA detection. The test results show that the MoS 2 /rGO/GCE probe exhibits good sensitivity (15.73 μA μM −1 cm −2 ), small limit of detection (13 nM) and wide range of detection (0.1 ∼ 110.0 μM) for DA in 0.1 M PBS medium (pH = 7.4), as well as good interference resistance, reproducibility and stability. This excellent sensing ability mainly stems from the synergistic effect of the prepared electrode material with abundant edge defects, small charge transfer resistance, large electrochemically active area, and more negative Zeta potential (–23.4 mV). Furthermore, the satisfactory and accurate detection of DA content in animal serums predicts its potential for practical applications in related biological aspects.
研究领域:
生物医学工程
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 23
·期 6
·1472-1481
·
IF 3.117
Chun-Xiao Li,Ru-Ting Huang,Xian-Yang Shi
Cu7S4/reduced graphene oxide (rGO) photocatalysts are attracting increasing interest because of their low cost and environmental friendliness. In this study, Cu7S4/rGO nanocomposites with high visible-light photocatalytic activity were successfully synthesized via biological and chemical methods. The prepared Cu7S4/rGO nanocomposites exhibited exceptional photocatalytic activity for methyl green (MG) reduction. In particular, the nanocomposites photocatalyst with A-N (biosynthesis with Na2S as the sulfur source) provided the best photocatalytic performance, and could degrade 98.3% MG within 100 min. Their photocatalytic activity sequence is in the following order: A-N (98.3%) > A-U (biosynthesis with CuSO4 as the copper source) (97.8%) > A-C (biosynthesis with CH4N2S as the sulfur source) (97.7%) > A-180 (96.7%) (chemical synthesis at 180 °C in a steel autoclave) > Cu7S4 (69.8%). After five repeated tests, the photocatalyst used in this study showed excellent stability. The photocatalytic activity enhancement can be attributed to Cu7S4 combined with rGO, which can enhance the active center and increase electron transfer. This study provides a novel method for the preparation of a photocatalyst that can quickly and effectively solve dye pollution, and reduce other pollutants. Additionally, the photocatalyst is expected to be used in the fields of photocatalysis, water decomposition and solar cells.
研究领域:
环境科学
·
材料科学
·
微生物学
✓ 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）