ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Guo-Biao Xu,Jing-Min Cui,Hong Liu,Guang-Gang Gao,Yun-Feng Qiu,Shu-Meng Zhang,Dong-Mei Wu
ABSTRACT Polyoxometalates (POMs) as efficient electrochemical catalytic components were successfully loaded on three-dimensional graphene foam (3DGF) forming novel POM-based carbon-material of POM@3DGF. Being the first time, POMs were loaded onto 3DGF matrix as a highly selective electrochemical biosensor, by which xanthine (Xan) and guanine (Gua) can be detected simultaneously with separated electrochemical signals. At pH = 2.0 buffer solution, two oxidation signals ascribed to Xan and Gua bases were observed at about 1.05 and 1.13 V respectively, which could not be observed separately by previous reported 1D carbon nanotube or 2D graphene modified GCEs. Furthermore, POM@3DGF modified GCE can be used to detect Xan and Gua bases in MCF-7 cell lysates, which extends the detection species of purines in cells by electrochemical approach. Our study opens a new avenue to accurate electrochemical assay of cellular purines by POMs-based carbon-materials.
研究领域:
生物化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2019
·
IF 6.309
Haoming Fang,Haichang Guo,Yiran Hu,Yanjuan Ren,Po-Chun Hsu,Shu-Lin Bai
With the increasing packaging density and multi-functionality, thermal management and electromagnetic pollution in electronic devices are crucial. In this work, we propose a novel method to in-situ grow hollow Fe 3 O 4 sphere (h-Fe 3 O 4 , inner and outer diameter of 870 nm and 975 nm, respectively) onto three-dimensional graphene foam (GF) surface and then filled it with polydimethylsiloxane (PDMS) to fabricate nanocomposites with high electromagnetic interference shielding effectiveness (70.37 dB from 8.2 to 12.4 GHz) and thermal conductivity (28.12 ± 1.212 W m −1 K −1 ) at room temperature. Moreover, conductive networks inside composites show super-flexible performance with high electrical conductivity (84.02 ± 8.385 S cm −1 ). The effect of in-situ growth hollow Fe 3 O 4 spheres in the enhancement of EMI SE has been demonstrated via comparing with different contents, morphologies and preparation processing. Besides, the mechanism of thermal conductivity has been investigated by FEM simulation and theoretical modeling. Finally, the usage of GF/h-Fe 3 O 4 /PDMS composites as thermal interface materials (TIMs) for chip cooling is proved to be successful, and the corresponding temperature under usage power density is accurately predicted. These comprehensive properties of GF/h-Fe 3 O 4 /PDMS composite open a potential application for next-generation TIMs in chip packaging.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2025
·
IF 14.3
Qiang-Qiang Zhao,Tian-Yu Zhang,Chaoqun Ma,Ibrar Ahmed,Han Wang,Bo Sun,Chi Liu,Chang Liu,Hui-Ming Cheng,You Zeng
The demand for lightweight, thin, and broadband microwave absorption materials has been growing rapidly with advancements in microelectronics and aerospace technology. Conventional microwave-absorbing materials often suffer from poor dispersion and limited electromagnetic attenuation capacity. Herein, we report a novel microwave absorption material that integrates ZIF-67-derived metal organic frameworks (MOFs) with hollow graphene foams (GrFs) synthesized via chemical vapor deposition. The hollow GrFs act as resonant cavities in enhancing multiple reflections and conductive loss, while the MOFs optimize impedance matching for highly efficient microwave absorption. The MOF@GrF-filled paraffin composites achieve a minimum reflection loss (RL min ) of −50.2 dB at a thickness of 1.3 mm and 7.1 wt.% filler loading, with an impressive microwave absorption efficiency of −38.6 dB/mm. This superior performance is attributed to the synergistic interactions between GrFs and MOFs, integrating conductive loss, cavity confinement, dipole polarization, interfacial polarization, magnetic loss, and improved impedance matching. This study paves a way for fabricating high-efficiency microwave absorption materials for application in fields of aerospace, medical equipment, and electronic industry.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Haoming Fang,Yunhong Zhao,Yafei Zhang,Yanjuan Ren,Shu-Lin Bai
To meet the increasing demands for effective heat management of electronic devices, a graphene-based polymeric composite is considered to be one of the candidate materials owing to the ultrahigh thermal conductivity (TC) of graphene. However, poor graphene dispersion, low quality of exfoliated graphene, and strong phonon scattering at the graphene/matrix interface restrict the heat dissipation ability of graphene-filled composites. Here, a facile and versatile approach to bond graphene foam (GF) with polydimethylsiloxane (PDMS) is proposed, and the corresponding composite with considerable improvement in TC and insulativity is fabricated. First, three-dimensional GF was coated with polydopamine (PDA) via π–π stack and functional groups from PDA reacted with 3-aminopropyltriethoxysilane (APTS). Then, the modified GF was compressed (c-GF) to enhance density and infiltrated with PDMS to get the c-GF/PDA/APTS/PDMS composite. As a result, these processes endow the composite with high TC of in-plane 28.77 W m–1 K–1 and out-of-plane 1.62 W m–1 K–1 at 11.62 wt % GF loading. Besides, the composite manifests obvious improvement in mechanical properties, thermal stability, and insulativity compared to neat PDMS and GF/PDMS composite. An attempt to use the composite for cooling a ceramic heater is found to be successful. Above results open a way for such composites to be applied for the heat management of electronic devices.
研究领域:
材料科学
·
复合材料
·
热管理技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2018
·
IF 8.173
Xuan Cai,Huilan Chen,Zhenxing Wang,Wenqian Sun,Libo Shi,Hongli Zhao,Minbo Lan
Here we present a new method to fabricate enzyme-mimic metal-free catalysts for electrochemical detection of superoxide anion (O 2 •− ) by introducing phosphate groups into graphene-based foam. Through a template-free hydrothermal process, graphene oxide (GO) was treated with different amount of phytic acid (PA) to obtain 3D porous graphene-based foam (PAGF). Characterizations demonstrate that phosphate groups were successfully modified on the surface and inter layer structure of PAGF materials and the defects and disorder degree of PAGF could be controlled by adjusting the addition of PA precursors. Meanwhile, the synthesized PAGF was successfully immobilized on screen printed carbon electrodes (SPCEs) and employed in O 2 •− detection. With PA treated on graphene structure, the resulted PAGF/SPCEs exhibit distinct characteristic redox peaks, showing enzyme-mimic catalytic activity toward O 2 •− dismutation. Also, the amount of modified phosphate groups has caused a considerable variety on the performance of PAGF-based electrodes. Apart from high sensitivity, wide liner range, low detection limit, good selectivity and long-term stability, our sensors also present satisfying performance in the real-time monitoring of drug-induced O 2 •− released from Hela cells . The reliability of the biological measurement was further demonstrated via electron paramagnetic resonance (EPR) to characterize the released O 2 •− from stimulated cells by using 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPOL) to trap the transient O 2 •− . The above results indicate that our established sensors hold potential application in the real-time detection of O 2 •− in biological samples.
研究领域:
材料科学
·
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2022
·Vol. 307
·期 12
·2200373
·
IF 4.402
Ge Gao,Mingqi Sun,Bing Dai,Lei Yang,Kang Liu,Zhenhuai Yang,Jiecai Han,Jiaqi Zhu
High-performance thermal interface materials are in increasing demand because of the problems of dissipating heat from high-power computing devices. To solve this problem, this study proposes a method of microstructural design through uniaxial compression of graphene foam along the out-of-plane direction. The thermal conductivity of the composites with graphene foam shows an anisotropic growth along the direction of the compressive strain. The in-plane thermal conductivity increases significantly from 0.189 to 1.669 W m −1 K −1 at an extremely low filler content of 2.24 vol%, whereas the out-of-plane thermal conductivity increases slightly to 0.303 W m −1 K −1 . Moreover, the samples exhibit outstanding in-plane thermal conductivity enhanced efficiency, which reaches 415.19% at a 1.29 vol% graphene content. The mechanism of anisotropic thermal conductivity enhancement is revealed by constructing a theoretical model based on a geometrical unit cell simplified from the morphology of graphene foam. This uniaxial compression method of a 3 structure provides a novel direction for improving the thermal conductivity of polymeric matrix composites more controllably.
研究领域:
材料科学
·
热管理技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Zhengyan Chen,Runzhuo Xue,Baoli Fan,Yilan Wang,Wenhui Tian,Lu Pei,Yanling Jin,Zhengzheng Guo,Zhenfeng Sun,Fang Ren,Penggang Ren
Although bimetallic nickel-cobalt sulfides (Ni/Co-S) have shown promising candidates as pseudocapacitive materials with excellent electrochemical performance, achieving high energy density, high power density, and good cyclability of Ni/Co-S electrode remains a challenge. In this study, the graphene foam (GF) with a three-dimensional (3D) skeleton was successfully prepared using a chemical vapor deposition (CVD) method. Subsequently, Ni/Co-S was in situ grown on the GF through a two-step hydrothermal method. A series of Ni/Co-S@GF- x ( x =1, 2, 3) electrodes were prepared and optimized for electrochemical performance by regulating the molar ratio of Ni/Co salt precursors (3:1, 4:1, 5:1). The abundant pore structure of Ni/Co-S@GF not only facilitates ion migration, but also provides numerous electrochemical redox active sites for reactions. When utilized as electrodes in supercapacitors, the Ni/Co-S@GF-2 with a Ni/Co salt’s molar ratio of 4:1 displays a specific capacity of 4.68 C cm −2 at 1 mA cm −2 . Furthermore, an asymmetric supercapacitor (ASC) was assembled using the optimal Ni/Co-S@GF-2 as cathode and Walnut shell-derived porous carbon as anode to evaluate the actual energy storage characteristics of the device. The ASC delivers a high power density of 822.86 mW cm −2 at an energy density of 32.0 mWh cm −2 . This work presents a promising approach for designing and preparing nickel-cobalt sulfides for application in flexible energy storage devices.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
Solar RRL
·
2021
·Vol. 5
·期 7
·2100210
·
IF 8.582
Lifen Su,Yuying Ning,Ziqiang Ma,Yuhao Zhang,Chuanlei Liu,Youli Zhang,Lei Miao,Jianhua Zhou,Bin Wu,Jiasheng Qian
Solar vapor generation is a sustainable and cost-effective approach to addressing the issue of water shortage. However, the challenges of solar steam generation still exist for achieving a high evaporation efficiency combined with long-term stability in the wastewater containing heavy metal ions and wide degrees of acidity and alkalinity (pH = 1–14). Herein, polypyrrole (PPy) loading on the N,S-doped graphene oxide (N,S-GO) foam is used for high-efficiency solar evaporation of treating wastewater. With the advantages of excellent broadband solar absorption ( >97%), extremely low emissivity (0.70), and outstanding hydrophilicity, the N,S-GO/PPy foam achieves a high evaporation efficiency of 90.5% under 1 sun illumination. More notably, the N,S-GO/PPy foam has strong adsorption of heavy metal ions (Fe 3+ , Cu 2+ , and Cr 6+ ) for treating wastewater synchronously evaporates at higher efficiencies of 94.7–98.4%. Interestingly, the high-toxicity Cr 6+ can be reduced to low-toxicity Cr 3+ effectively by the synergistic effect of N,S-GO and PPy. In addition, the N,S-GO foam shows a better long-term resistance of acidity and alkalinity for 45 days. A new insight is offered into high-efficiency solar evaporation for treating wastewater and water purification.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Lin Zhang,Hongqiang Li,Xuejun Lai,Tianyuan Gao,Xingrong Zeng
A lot of attention has recently been focused on wearable strain sensors because of their promising applications in the rising areas of human motion detection, health monitoring, and smart human–machine interaction. However, the design and fabrication of self-healable strain sensors with superior overall properties including stretchability, sensitivity, response ability, stability, and durability is still a huge challenge. Herein, we report an innovative self-healable strain sensor with exceptional overall performance constructed with three-dimensional binary-conductive-network silver nanowire-coated thiolated graphene foam (AgNWs@TGF) and room-temperature self-healing functionalized polyurethane (FPU) elastomer. Taking advantage of the good ductility and continuity of the AgNWs@TGF binary structure and the excellent resilience of the FPU, the strain sensor exhibits good stretchability (up to 60% strain), high sensitivity [gauge factor (GF) of 11.8 at 60% strain and detection limit of 0.1% strain], fast response ability (response/recovery time of 40/84 ms), and exceptional durability for 800 cycles of fatigue test. Besides, the highly flexible polydimethylsiloxane chains, strong intermolecular hydrogen bonding, and dynamic exchange reaction of aromatic disulfides ensure the sensor excellent recovery property of electrical conductivity, and the GF of sensor after self-healed only increases slightly. More importantly, the sensor is successfully applied for detecting a variety of human motions including pulse beats, voice recognitions, various joint movements, and handwriting. The method for preparing room-temperature self-healable strain sensor is facile, scalable, and cost-effective. The finds provide a new perspective on fabricating new-generation high-performance and functional strain sensors for health monitoring, wearable electronics, and intelligent robots.
研究领域:
材料科学
·
生物医学工程
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2020
·
IF 4.551
Zepei Yu,Yanhui Feng,Daili Feng,Xinxin Zhang
Developing novel shape-stabilized phase change materials (ssPCMs) is of vital importance for efficient utilization of thermal energy. In addition, elucidation of the host–guest interaction mechanism is a prerequisite for the methodical design and synthesis of ssPCMs. Here, we prepared a new hierarchical structure, porous graphene foam-CNT hybrid structures (GCNTs), to serve as matrix materials. Micropores and mesoporous channels were introduced during the reassembly of graphene foam and carbon nanotubes (CNTs). PEG was filled into the GCNTs via the solution impregnation method to prepare composite PCMs, whose structural and phase change properties were evaluated via FTIR, XRD , BET, and DSC . A theory was proposed that large pores improve loading capacity, while small pores improve supporting-immobilization capacity. The radius of gyration as well as the melting and diffusion processes were analyzed using molecular dynamics (MD) simulation methods, which revealed that PEG resides in the composite its flexibility is enhanced and the PEG molecules favor the formation of an amorphous liquid layer near the pore walls, resulting in decreased melting point and latent heat. MD simulations also indicated that PEG molecules form a liquid layer near pore walls and crystallize at the pore center. The highest loading rate achieved in the composites was 80 wt%, although the corresponding surface area was far below that of graphene foam due to the hierarchical porous structure. This study will provide insights into the host-guest interaction mechanism in porous composite materials and the design of novel composite phase change materials with improved phase change properties according to the design of suitable hierarchical porous materials.
研究领域:
材料科学
·
热能工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2018
·
IF 2.311
Yan Zhong,Xianhua Tan,Tielin Shi,Yuanyuan Huang,Siyi Cheng,Chen Chen,Guanglan Liao,Zirong Tang
The rapid development of flexible electronics and artificial intelligence brings an urgent demand for high-performance flexible pressure sensors. In this paper, a method is proposed to prepare wrinkled graphene foam by freeze-drying and post-annealing method, where zinc chloride is used to tune structure. A piezoresistive pressure sensor based on the wrinkled graphene foam is assembled. Benefiting from the unique contact interface of wrinkled microstructures, as well as the mechanical strength and the superior resilience of the foam structure, the piezoresistive pressure sensor exhibits a reliable stability (>10 5 cycles), short response time(150 ms)and low relaxation time (120 ms). And it also demonstrates good performances in various applications, such as pulse detection, voice recognition as well as the finger joints movement. It is suggested that the pressure sensor based on wrinkled graphene foam has great potential in flexible electronics to achieve health monitoring and motion detection. It also paves the way for other wrinkled materials to be involved in the fabrication of pressure sensors.
研究领域:
材料科学
·
传感器技术
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2014
·Vol. 6
·期 13
·7424-7429
·
IF 6.739
Beibei Zhan,Changbing Liu,Huaping Chen,Huaxia Shi,Lianhui Wang,Peng Chen,Wei Huang,Xiaochen Dong
Three-dimensional graphene foam (3DGF) is a superior sensing material because of its high conductivity, large specific surface area and wide electrochemical potential windows. In this work, hexagonal Ni(OH)2 nanosheets are deposited on the surface of chemical vapor deposition-grown 3DGF through a facial hydrothermal process without any auxiliary reagents. The morphology and structure of the composite are characterized by scanning electron microscopy (SEM), transmission electron microscope (TEM), Raman spectroscopy, and X-ray diffraction (XRD). Based on the Ni(OH)2/3DGF composite, a free-standing electrochemical electrode is fabricated. Being employed as a nonenzymatic glucose detection electrochemical electrode, it exhibits a high sensitivity (∼2.65 mA mM−1 cm−2), low detection limit (0.34 μM) and excellent selectivity with a linear response from 1 μM to 1.17 mM. The excellent sensing properties of the Ni(OH)2/3DGF electrode may be attributed to the synergistic effect of the high electrocatalytic activity of Ni(OH)2 nanosheets and the high conductivity and large surface area of 3DGF.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）