ACS Applied Materials & Interfaces
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2024
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IF 8.3
Ning Li,Junhao Liu,Wenfang Zeng,Yawei Xu,Jing Li
In the domain of smart electronic devices, graphene films play a pivotal role due to their flexibility and high thermal conductivity. Within the realm of fabricating highly thermally conductive graphene films, Joule heating technology has garnered significant attention because of its capability for rapid temperature elevation and reduction of graphitization duration. However, substantial gas emission occurs during the reduction of graphene oxide films using this method, leading to immediate combustion and film fracturing, thereby limiting the rapid and uninterrupted production of graphene films. To address this challenge, a rapid reduction preparation process is introduced. This process initiates with a two-step reduction of graphene oxide films employing a reducing agent to establish gas escape pathways within the graphene films beforehand. Subsequently, the film is pressurized and Joule-heated using a graphite plate, with the entire heating process lasting only 800 s. The resulting graphene film exhibits a remarkable thermal conductivity of up to 1012W/(m·K). This method enhances the production efficiency of high thermal conductivity graphene films and is expected to further reduce production costs.
研究领域:
材料科学
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电子工程
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DOI
PubMed
高影响因子
CARBON
·
2018
·
IF 7.082
Ke Wang,Mengxiong Li,Jiajia Zhang,Hongbin Lu
Graphene film has potential to act as an excellent heat dissipation material. However, its thermal conductivity suffers from some limitations, including small graphene lateral sizes and low production efficiency from a practical viewpoint. To solve these issues, we propose an industrially viable protocol to synthesize homogeneously oxidized graphite oxide (GtO) with large lateral sizes and easy-purifying features. We employ polyacrylonitrile (PAN) as a coupling agent to repair the defects on GtO sheets and link these sheets together during the annealing treatment. The graphitized GtO/10%PAN film (g-GtO/10%PAN) shows excellent thermal and electrical properties, with an in-plane thermal conductivity of 1629.24 ± 43.88 W m −1 K −1 and an electrical conductivity of 9645.29 ± 199.44 S cm −1 . Furthermore, it also exhibits outstanding flexibility; the original thermal conductivity can be maintained after 20,000 times bending. The g-GtO/10%PAN film offers an alternative to replace commercially used graphitized polyimide (PI) film. Our research provides a general method for the fabrication of high quality graphene film.
研究领域:
材料科学
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热管理技术
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DOI
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 17
·5486-5495
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IF 4
Huangqing Ye,Jiahui Chen,Yougen Hu,Yunming Li,Yu Wang,Xian-Zhu Fu,Rong Sun
Two-dimensional copper sheets were introduced as the catalyst and bridge to enhance the electrical and thermal conductivity of graphene films prepared from graphene oxide nanosheets via a thermal reduction method. The effects of adding different amounts of copper sheets in the composite films were investigated, and the results show that the electrical and thermal conductivity of the graphene films could be increased by 3 times and 64.9%, respectively. The two-dimensional copper sheets not only play an important role as a catalyst toward improving the graphitization degree of reduced graphene oxide, but also act as a bridge and promote the interconnection of the electrical and thermal conduction paths in the composite films due to the good electrical and thermal conductivity of copper. Moreover, the heat dissipation experiment shows that this enhanced graphene composite film has potential applications in the heat management of electronics.
研究领域:
材料科学
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电子工程
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产品关联
DOI
PubMed
高影响因子
Sensor Letters
·
2017
·Vol. 15
·期 8
·682-689
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IF 0
Li Yueqi,Hu Jingfang,Zou Xiaoping,GuoweiGao
In this paper, a simple and highly sensitive sensing interface of graphene film for hexavalent chromium (Cr(VI)) determination has been prepared by controllable electrochemical deposition on the gold electrode surface. The graphene film was obtained by direct electroreduction of graphene
oxide (GO) in suspension solution. The investigations on deposition parameters of this controllable preparation, such as potential and deposition time, were carried out by the potentiostatic method to study the effects of them on the graphene film. The fabrication process and electrochemical
properties of graphene film were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM) and electrochemical techniques, respectively. The conditional parameters, including detection potential, the concentration of supporting electrolyte and pH, were optimized
for Cr(VI) analysis. Without preconcentration, chronoamperometry method was used for Cr(VI) fast detection. Under the optimized conditions, the graphene film modified electrode provided a fast detection process, a wide linear range from 5 μg/L to 2000 μg/L, and a low detection
limit of 0.5 μg/L (S/N ≥ 3). Also, the developed graphene film showed a good stability and anti-interference for Cr(VI) determination. The reported work holds promise for practical application due to its simple, fast, environment-friendly and economical natures.
研究领域:
环境科学
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分析化学
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DOI
Advanced Materials Interfaces
·
2021
·Vol. 8
·期 7
·2001947
·
IF 6.147
Wei Chen,Chaoxing Wu,Tailiang Guo,Hailong Hu,Fushan Li
Metals used in the electronics, machinery manufacturing, and construction industry are often chemically reactive and corrosion-prone, while barriers on a metal as a conventional method for anticorrosion always have negative effects including a toxic nature, thickness increase over time, and changes of electrical and optical properties after surface coating. This study employs a benzene solution to induce a rapid formation of a polycrystalline graphene film on copper foils or iron sheet substrates under atmospheric conditions by electromagnetic induction, which is non-toxic and environment-friendly and produces favorable anticorrosive effects. The microscopic analysis shows that the as-grown film is a polycrystalline graphene complex of graphene crystallites. It is revealed that the copper foils or iron sheets with the graphene film is significantly resistant to strong corrosion, with the corrosion current density is one order of magnitude lower when compared with samples without the graphene films. The polycrystalline structure of the graphene film can prevent the electronic conduction of the surface, thereby reducing corrosion and local over-corrosion phenomena when metals are situated in a long-term exposure to corrosive environments.
研究领域:
材料科学
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化学工程
·
腐蚀与防护
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
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IF 13.273
Junlin Ma,Yu Jiang,Liuxue Shen,Hongting Ma,Tongrui Sun,Fengjuan Lv,Yuefeng Liu,Junshan Liu,Nan Zhu
Integrating functional components into graphene film is crucial for taking full advantage of graphene and manufacturing film-based devices. However, most graphene film-based system acts specialized property with complicated fabricated process, limiting further application. Herein, a highly compatible graphene nanofilm, decorated by electroactive Prussian blue (PB) and photoelectric responsive quantum dots (QDs), has been prepared via a simple and effective oil-water (O/W) self-assembly engineering. Interestingly, this graphene film could be transferred on various substrates for flexible application. As a result, PB and QDs have played a synergic effect with reduced graphene oxide (rGO) matrix, respectively, acquiring both excellent electrochemical sensing behaviors and extremely enhanced photocurrent generation compared with pure QDs film under simulated solar light. Furthermore, impressive biosensing performance has been obtained by enzyme-modified PB-rGO-QDs film. Additionally, proposed film-based wearable textile H 2 O 2 sensor possesses high sensitivity of 53.8 µA mM −1 cm −2 , while developed wearable glucose biosensor exhibits good performance, with a sensitivity of 37.24 µA mM −1 cm −2 . Significantly, wearable devices of PB-rGO-QDs films on textile have established flexible bending lifetime over thousands of cycles, accompanying with stable sensor and photoelectronic properties. Prospectively, PB-rGO-QDs films would provide an efficient strategy of multi-components self-assembly for broadening the application of graphene and developing wearable biosensing/photoelectronic devices.
研究领域:
材料科学
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生物医学工程
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传感器技术
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DOI
高影响因子
Materials
·
2021
·Vol. 14
·期 17
·5067
·
IF 3.623
Jiaxin Tang,Luo Wei,Shuaijie He,Jihui Li,Ding Nan,Liqiang Ma,Wanci Shen,Feiyu Kang,Ruitao Lv,Zhenghong Huang
An ultrasensitive enzyme-free glucose sensor was facilely prepared by electrodepositing three-dimensional dendritic Cu on a room temperature exfoliated graphite-derived film (RTEG-F). An excellent electrocatalytic performance was demonstrated for glucose by using Cu/RTEG-F as an electrode. In terms of the high conductivity of RTEG-F and the good catalytic activity of the dendritic Cu structures, the sensor demonstrates high sensitivities of 23.237 mA/mM/cm2, R2= 0.990, and 10.098 mA/mM/cm2, R2= 0.999, corresponding to the concentration of glucose ranging from 0.025 mM to 1.0 mM and 1.0 mM to 2.7 mM, respectively, and the detection limit is 0.68 μM. In addition, the Cu/RTEG-F electrode demonstrates excellent anti-interference to interfering species and a high stability. Our work provides a new idea for the preparation of high-performance electrochemical enzyme-free glucose sensor.Keywords:exfoliated graphite-derived film;dendritic Cu structures;enzyme-free glucose sensor
研究领域:
生物医学工程
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材料科学
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产品关联
DOI
PubMed
高影响因子
CHEMISTRY OF MATERIALS
·
2016
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IF 9.407
Zhen Xu,Li Peng,Yingjun Liu,Zheng Liu,Haiyan Sun,Weiwei Gao,Chao Gao
Graphene macroscopic materials have attracted tremendous attention for their fascinating performance and rich functionalities. Here, we provide an elaborate description of techniques in the fabrication of graphene macroscopic materials, focusing on the wet-spinning of 1D fibers and wet-spinning of continuous 2D films and 3D ultraflyweight aerogels. The thread of the research concepts is discussed to offer an overview of graphene macroscopic assembly. We summarize the fabrication system of wet-spinning of fiber and films, which extends to the chemistry of solvated graphene, the formation of graphene LCs, and the chemical/thermal reduction of graphene materials. The experimental details of graphene ultraflyweight aerogel are also been described. We hope that this paper can act as an experimental guidance for researchers, and become suggestive for forthcoming advances in graphene macroscopic materials.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
CARBON
·
2020
·
IF 8.821
Shujing Chen,Qianlong Wang,Maomao Zhang,Ruizhi Huang,Youyuan Huang,Jie Tang,Johan Liu
With the increasing demand on integration and better performance of portable electronics devices, the system operation temperatures are expected to continue to increase, leading eventually to degeneration in functional performance and reliability. Therefore, demand for thermal management materials that effectively spread heat and reduce heat density is urgent. The existing solution of pyrolytic graphite film (PGF) is unsatisfactory due to their low heat flux carrying capacity or low thermal conductivity , as well as poor mechanical performance. This work solves the problem by substituting ultra-thick (≥75 μm) graphene film (GF) for PGF, offering more than three times higher heat flux carrying capacity. The conjugation of large crystallinity and firm structures endows GFs with excellent thermal conductive performance (up to 1204 ± 35 W m −1 K −1 ), great heat flux carrying capacity, and good foldability (5000 cycles folding). In addition to this, such a GF is produced based on an economically efficient and quasi-industrial method incorporating continuous high-pressure homogenization processing (HPH), indicating an enormous potential as a new pathway to thermal management applications.
研究领域:
材料科学
·
热能工程
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产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Xingke Ye,Yucan Zhu,Hedong Jiang,Ziyu Yue,Liheng Wang,Zhongquan Wan,Chunyang Jia
Boosting the utilization rate of graphene sheets in compact graphene film is essential to realize high-density energy storage for graphene film based supercapacitors . Here, a p -phenylenediamine (PPDA) molecules supporting holey graphene sheets framework is built in graphene film (PPDA-HGF). In PPDA-HGF, the nanopores across the basal plane of graphene sheets promote ion access to graphene sheet surface, the PPDA molecular “supports” between graphene layers create uniformly expanding interlayer spacing (~1.2 nm), which is beneficial for ion transport between layers. So, the open framework contributes to synergistic effect for ion access and transport in PPDA-HGF. With abundant ion-accessible transport channels, good wettability (42°) and high conductivity (3927 S m −1 ), PPDA-HGF exhibits significant improvement of electrochemical performance comparing to counterparts and delivers a gravimetric capacitance of 300 F g −1 and a volumetric capacitance of 516 F cm −3 , excellent rate capability (78.3% capacitance retention from 0.5 to 100 A g −1 ), and superior cycling stability. Furthermore, the flexible solid-state supercapacitor based on PPDA-HGFs delivers comparable volumetric energy density of 2.7 Wh L −1 to 4 V/500 μAh Li thin-film batteries and practicably mechanical flexibility. This work opens up a structural cooperation strategy to achieve synergistic effect for ion access and transport in compact graphene film.
研究领域:
材料科学
·
能源存储与转换
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 33
·17325-17334
·
IF 8.867
Guomin Ding,Weicheng Jiao,Rongguo Wang,Yue Niu,Lifeng Hao,Fan Yang,Wenbo Liu
Recently, multifunctional superhydrophobic surfaces with high adhesion behavior have attracted much attention for microdroplet transportation. Here, we report for the first time a multifunctional, rose-petal-like, superhydrophobic graphene film via the self-assembly of graphene oxide (GO) that has self-sensing and fast recovery properties for microdroplet transportation. This superhydrophobic film does not require a hydrophobic coating and has a micro-nanoscale hierarchical structure. Because of its structure, our biomimetic, superhydrophobic film has high adhesive force to water droplets and can be used as a medium for microdroplet transportation. In addition, because the film was constructed using pure graphene, it has excellent conductivity properties and an immediate response system is also built to detect potential damage. Moreover, owing to the gas sensing properties of graphene, our film has self-sensing properties where the resistance of the film increases gradually when water droplets are close to it. What's more, the film has an ultra-fast Joule heating rate of 18 °C s−1. Based on these properties, the recovery time for the resistance of the film can be reduced by 57.7% for water droplet transportation. Therefore, our multifunctional, superhydrophobic graphene film can be used for smart microdroplet manipulation in the future.
研究领域:
材料科学
·
生物仿生学
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产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2024
·Vol. 35
·期 45
·455202
·
IF 2.9
Xuan Xu,Zhenhu Li,Haoxiang Li,Yongsu Li,Yu Zeng,Shuangyi Liu
Scalable production of reduced graphene oxide (rGO) films with high mechanical-electrical properties is desirable as these films are candidates for wearable electronics devices and energy storage applications. Removing structural incompleteness such as wrinkles or voids in the graphene films, which are generated from the assembly process, would greatly optimize their mechanical properties. However, the densely stacked graphene sheets in the films degrade their ionic kinetics and thus limit their development. Here, a horizontal-longitudinal-structure modulating strategy is demonstrated to produce enhanced mechanical, conductive, and capacitive graphene films. Typically, two-dimensional large graphene sheets (LGS) induce regular stacking of graphene oxide (GO) during the assembly process to reduce wrinkles, while one-dimensional single-walled carbon nanotubes (SWCNT) bridge with graphene sheets to strengthen the multidirectional intercalation and reduce GO layer restacking. The simultaneous incorporation of LGS and SWCNT synergistically creates a fine microstructure by improving the alignment of graphene sheets, increasing continuous conductive pathways to facilitate electron transport, and enlarging interlayer spacing to promote electrolyte ion diffusion. As a result, the obtained graphene films are flat and exhibit signally reinforced mechanical properties, electrical conductivity (38727 S m−1), as well as specific capacitance (232 F g−1) as supercapacitor electrodes compared to those of original rGO films. Moreover, owing to the comprehensive improved properties, a flexible gel supercapacitor assembled by the graphene film-based electrodes shows high energy density, good flexibility, and excellent cycling stability (93.8% capacitance retention after 10 000 cycles). This work provides a general strategy to manufacture robust graphene structural materials for energy storage applications in flexible and wearable electronics.
研究领域:
材料科学
·
能源存储
·
纳米技术
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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）