ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Na Li,Xuankai Huang,Haiyan Zhang,Yunyong Li,Chengxin Wang
Improving mass loading while maintaining high transparency and large surface area in one self-supporting graphene film is still a challenge. Unfortunately, all of these factors are absolutely essential for enhancing the energy storage performance of transparent supercapacitors for practical applications. To solve the above bottleneck problem, we produce a novel self-supporting flexible and transparent graphene film (STF-GF) with wrinkled-wall-assembled opened-hollow polyhedron building units. Taking advantage of the microscopic morphology, the STF-GF exhibits improved mass loading with high transmittance (70.2% at 550 nm), a large surface area (1105.6 m2/g), and good electrochemical performance: high energy (552.3 μWh/cm3), power densities (561.9 mW/cm3), a superlong cycle life, and good cycling stability (the capacitance retention is ∼94.8% after 20,000 cycles).
研究领域:
材料科学
·
纳米科技
·
电化学
·
能源存储
·
柔性电子学
✓ 已验证
DOI
高影响因子
APPLIED THERMAL ENGINEERING
·
2025
·
IF 6.9
Kai Yang,Haoran Shen,Kangyong Li,Li Fang,Jian Huang,Rong Zhang,Ruiwen Dai,Zhiqiang Wang,Dongdong Chen,Guoqing Xin
Liquid cooling technology has emerged as a promising solution for the heat dissipation of high-power electronics due to its high efficiency and compact design. However, the commonly used silicone-based thermal interface materials (TIMs) have a high compressive modulus and are prone to hardening or deformation in fluorinated electronic liquid, which leads to an increase in interfacial thermal resistance, severely impacting liquid cooling efficiency. Herein, inspired by foam structure, a 3D interconnected porous graphene films (FSGF) is constructed by mold-assisted wet spinning method, which exhibits an extremely low thermal resistance (4.2 K mm 2 W −1 ) that is about several orders of magnitude lower than those of commercial thermal greases, gels, adhesives and pads (>25 K mm 2 W −1 ). In the cold plate liquid cooling performance test, the cooling efficiency of the FSGF was nearly 2-fold higher than that of commercial silicon-based TIMs, and it has long-term reliability in electronic fluorinated liquid. This research demonstrates scalable manufacturing of high-performance pure inorganic carbon-based TIMs that holds great promise for advanced liquid cooling thermal management.
研究领域:
材料科学
·
纳米技术
·
热管理
·
电子散热
·
先进制造
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2025
·
IF 11.6
Yunjing Wang,Lei Xu,Yiming Ju,Weiyan Yu,Lu Xu,Jingcheng Hao
Graphene-based thin-film materials have been regarded as promising solid lubricants for industrial applications. However, to create thin graphene films with high and long-lasting lubricity especially under macroscopic contacts is still challenging. Here a composite thin graphene film capable of achieving a coefficient of friction (CoF) of as low as ∼0.06 for 214110 consecutive reciprocating friction cycles under a relatively high contact normal load and sliding frequency of 7 N and 30 Hz, respectively, all by physical lubrication is fabricated via a “sol-gel-film” transition approach, which has hardly been exploited for constructing thin film-based solid lubricants, using few-layer graphene nanosheets (GNS) and polymer nanofibers that are both of unsatisfactory lubricity as building blocks. Such “two negatives make an affirmative” lubrication mechanism is likely to be a synergistic effect between the heat dissipating capacity of GNS and the robustness of polymer nanofibers. And this also endows the resultant gel film a superb and tunable thermal conductivity and mechanical strength via controlling the in-plane stretching ratio of a hybrid gel precursor for assembling the composite film. We envision that our study may provide a simple and effective solution to the technical challenges of graphene-based lubrication films.
研究领域:
材料科学
·
纳米技术
·
机械工程
·
表面工程
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2023
·
IF 4.5
Long Peng,Zhixiong Liu,Zhicheng Liu,Junlin Huang,Wei Wang,Hong Yin,Binhong He,Yucan Zhu,Zhaohui Hou
Molecular modified graphene films (M-GFs) have the advantages of simple preparation and high electrochemical activity, which has a promising future in the field of electrochemical energy storage . However, the influence of molecular doping technology is rarely studied for electrochemical performance of the M-GFs, hindering the development of high-performance M-GFs. Herein, we have demonstrated that a selective adsorption self-assembly strategy can prepare M-GFs with higher performance than physical mixing method. The prepared M-GF exhibits a three-dimensional porous structure with active organic molecules support, and its interlayer spacing is evenly widened. The resulting M-GFs as cathode material of aqueous Zinc-ion hybrid supercapacitors (AZISCs) exhibits a high specific capacitance of 228F g -1 , and a good capacitance retention of 42% (@10 A g -1 ), which are 25% and 13% higher than those of the physical mixing method, respectively. Besides, the energy and power density of the devices can reach 82 Wh kg -1 and 20.3 kW kg -1 , respectively. After 5000 cycles of charge and discharge testing, the capacitance retention rate of the device can still reach 94%. The impressive results indicate that the M-GFs by selective adsorption self-assembly strategy could be a potential high-performance electrode material for the AZISCs..
研究领域:
材料科学
·
电化学能源存储
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2019
·Vol. 15
·期 10
·1804559
·
IF 10.856
Xing Tang,Congyi Wu,Lin Gan,Tian Zhang,Tingting Zhou,Jin Huang,Hao Wang,Changsheng Xie,Dawen Zeng
Flexible pressure sensors as electronic skins have attracted wide attention to their potential applications for healthcare and intelligent robotics. However, the tradeoff between their sensitivity and pressure range restricts their practical applications in various healthcare fields. Herein, a cost-effective flexible pressure sensor with an ultrahigh sensitivity over an ultrawide pressure-range is developed by combining a sandpaper-molded multilevel microstructured polydimethylsiloxane and a reduced oxide graphene film. The unique multilevel microstructure via a two-step sandpaper-molding method leads to an ultrahigh sensitivity (2.5–1051 kPa −1 ) and can detect subtle and large pressure over an ultrawide range (0.01–400 kPa), which covers the overall pressure regime in daily life. Sharp increases in the contact area and additional contact sites caused by the multilevel microstructures jointly contribute to such unprecedented performance, which is confirmed by in situ observation of the gap variations and the contact states of the sensor under different pressures. Examples of the flexible pressure sensors are shown in potential applications involving the detection of various human physiological signals, such as breathing rate, vocal-cord vibration, heart rate, wrist pulse, and foot plantar pressure. Another object manipulation application is also demonstrated, where the material shows its great potential as electronic skin intelligent robotics and prosthetic limbs.
研究领域:
生物医学工程
·
柔性电子学
·
传感技术
·
可穿戴设备
·
转化医学
·
智能材料
·
人机交互
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2022
·
IF 4.331
Qing Wang,Lang Zhou,Jingzhe Li,Zheng Li,Tao Wang
Polymer hydrogel-based solid-state supercapacitors exhibit great potential applications in flexible devices. Nevertheless, the poor electrode–electrolyte interfacial properties restrict their advances. Herein, by taking the well-developed polyvinyl alcohol (PVA)/H2SO4 gel electrolyte and the graphene film electrode as the prototype, a very simple strategy is demonstrated to improve the interfacial affinity between the electrode and the hydrogel electrolyte by a preadsorbed highly hydrophilic polyzwitterion layer of poly(propylsulfonate dimethylammonium propylmethacrylamide) (PPDP) on the electrode surface. Electrochemical measurements confirm that the charge-transfer resistance on the interface is effectively reduced after modification with PPDP. Consequently, the obtained areal capacitance experiences a 3-fold increase compared to the unmodified ones. Results from electrochemical quartz crystal microbalance with dissipation demonstrate that more ions can be reversibly transferred on the modified interface during the change–discharge cycles, suggesting that the accessible surface area on the electrode is also increased. The hydrophilic PVA layer shows a similar function but with a much smaller efficiency. The strategy depicted here is highly universalizable and can be generalized to different electrode/electrolyte systems or other electrochemical energy storage devices.
研究领域:
材料科学
·
电化学
·
储能设备
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Haichao Xu,Qing Wang,Yinyan Deng,Zhiping Peng,Tao Wang
Polymer hydrogel electrolytes show great advantages in the flexible electronic applications of supercapacitors, but the poor interfaces between electrode and electrolyte are limiting their energy and power densities. In this work, by taking the well-developed pair of poly(vinyl alcohol)/H 2 SO 4 gel electrolyte and graphene film electrode as a prototype, after electrochemically depositing a functional monomer of zwitterionic 3,4-ethylenedioxythiophene (EDOTSB) onto the graphene film electrodes, the specific capacitance of supercapacitors receives a 2.5-fold increase up to 248 mF cm −2 (346 F g −1 ). By comparing with other pendent groups on EDOT, the decisive role of the zwitterionic group is demonstrated. Attributed to the strong hydration ability of the zwitterion group, the deposition of EDOTSB effectively improves the hydrophilicity of graphene film electrodes, so that the interfacial affinity between the electrode and hydrogel electrolyte is greatly promoted. On the one hand, the EIS measurements certify that the charge-transfer resistance is largely reduced. On the other hand, tests with electrochemical quartz crystal microbalance demonstrate that the interior of graphene film is highly accessible for EDOTSB, thereby enlarging the accessible surface area on the electrode and accelerating the electrolyte infilling process. Furthermore, the general comparison with the liquid electrolyte counterpart is also discussed. This developed method is highly universalizable and can find applications in different electrode/electrolyte supercapacitors and other high-performance flexible energy storage devices.
研究领域:
材料科学
·
电化学
·
能量存储
·
柔性电子
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Bin Sun,Zhigang Wang,Bo Zhao,Yanfei Jin,Yaqiang Li,Song Yang
abstract In this study, an electrochemical immunosensor for nerve growth factor (NGF) detection was constructed based on graphene oxide (GO)-chitosan (CS) composite membrane. Scanning electron microscopy (SEM) was applied to characterize the morphology of GO-CS composite films. Cyclic voltammetry and differential pulse voltammetry were used to optimize the detection conditions of electrochemical immunosensors. The prepared electrochemical immunosensor has an excellent linear relationship with the peak electrode current when the concentration of NGF is 0.1–100 ng/mL with a limit of detection (0.0081 ng/mL). The recovery rate of serum samples was 99.00–104.06 %. Therefore, the immunosensor established by the institute is accurate, stable and sensitive.
研究领域:
材料科学
·
生物化学
·
分析化学
·
纳米技术
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 24
·2300191
·
IF 13.3
Shuangshuang Wu,Huihui Shi,Shuxin Wei,Hui Shang,Weiping Xie,Xipao Chen,Wei Lu,Tao Chen
Utilization of rewritable luminescent materials for secure information storage and delivery has long been envisaged to reduce the cost and environmental wastes. However, it remains challenging to realize a temporally/spatially controlled display of the written information, which is crucial for secure information encryption. Here, inspired by bioelectricity-triggered skin pattern switching in cephalopods, an ideal rewritable system consisting of conductive graphene film and carbon dots (CDs) gel with blue-to-red fluorescence-color changes via water-triggered CDs aggregation and re-dispersion is presented. Its rewritability is guaranteed by using water ink to write on the CDs-gel and employing Joule heat of graphene film to evaporate water. Due to the highly controlled electrical stimulus, temporally/spatially controlled display is achieved, enabling on-demand delivery and duration time regulation of the written information. Furthermore, new-concept environment-interactive rewritable system is obtained by integrating sensitive acoustic/optical sensors and multichannel electronic time-delay devices. This work opens unprecedented avenues of rewritable systems and expands potential uses for information encryption/delivery.
研究领域:
材料科学
·
纳米技术
·
光电技术
·
信息安全
·
仿生学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Lin Yuan,Xiaoguang Gao,Ranran Kang,Xiaoliang Zhang,Xuejuan Meng,Xiaochun Li,Xiujun Li
The continuous, noninvasive monitoring of human blood pressure (BP) through the accurate detection of pulse waves has extremely stringent requirements on the sensitivity and stability of flexible strain sensors. In this study, a new ultrasensitive flexible strain sensor based on the interlayer synergistic effect was fabricated through drop-casting and drying silver nanowires and graphene films on polydimethylsiloxane substrates and was further successfully applied for continuous monitoring of BP. This strain sensor exhibited ultrahigh sensitivity with a maximum gauge factor of 34357.2 (∼700% sensitivity enhancement over other major sensors), satisfactory response time (∼85 ms), wide strange range (12%), and excellent stability. An interlayer fracture mechanism was proposed to elucidate the working principle of the strain sensor. The real-time BP values can be obtained by analyzing the relationship between the BP and the pulse transit time. To verify our strain sensor for real-time BP monitoring, our strain sensor was compared with a conventional electrocardiogram–photoplethysmograph method and a commercial cuff-based device and showed similar measurement results to BP values from both methods, with only minor differences of 0.693, 0.073, and 0.566 mmHg in the systolic BP, diastolic BP, and mean arterial pressure, respectively. Furthermore, the reliability of the strain sensors was validated by testing 20 human subjects for more than 50 min. This ultrasensitive strain sensor provides a new pathway for continuous and noninvasive BP monitoring.
研究领域:
生物医学工程
·
材料科学
·
传感器
·
医疗技术
·
医疗器械
✓ 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）