ACS Applied Materials & Interfaces
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2023
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IF 9.5
Yaming Liu,Chen Zhang,Youyou Chen,Rui Yin,Peng He,Weiwei Zhao
Highly sensitive and conformal sensors are essential for the implementation of human–machine interfaces, health monitoring, and rehabilitation prostheses. The proper adjustment of conductive pathways in the sensing materials is essential for their sensitive transduction of mechanical stimuli into electrical signals. However, the rational, precise, and wide-range control of electrical networks within traditional conductive composites is difficult due to the randomly distributed fillers. Herein, we adopt an indirect 3D-printing method to fabricate pressure sensors with various microchannels for liquid metal (LM) to form consistent and tunable conductive pathways. LM is highly conductive, fluidic, and incompressible at ambient conditions, which guarantees the reliable regulation and function of our pressure sensor. Additive manufacturing provides a facile way to construct complicated microchannels with different lengths, different orientations, cross-sectional sizes, depth-width ratios, and shapes, which can effectively modulate the sensitivity and the sensing range. Under the optimized structural configurations, our sensor achieves a high sensitivity of 1.139 kPa–1, a detection range of 0–68 kPa (loading process), and stability of over 5000 cycles, whose sensing performance is better than most microchannel-filled LM sensors. It can achieve high-accuracy monitoring of pulse, speaking and gestures, and exhibit a full recognition of objects under the assistance of machine learning. This work can provide new ideas on the design of conductive pathways in flexible electronics and expand the application of recyclable LM in human–machine interfaces.
研究领域:
材料科学
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生物医学工程
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电子工程
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
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2024
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IF 8.3
Yanlin Chen,Diana Estevez,Zihao Zhu,Yunfei Wang,Yiu-Wing Mai,Faxiang Qin
The dramatic growth of smart wearable electronics has generated a demand for conductive hydrogels due to their tunability, stimulus responsiveness, and multimodal sensing capabilities. However, the substantial trade-off between mechanical and electrical properties hinders their multifunctionality. Here, we report a double-network hydrogel composite that features a conductive “highway” constructed using magnetic-field-aligned nickel nanowires and liquid metal. The liquid metal fills the gaps between the aligned nickel nanowires. Such interconnected structures can form efficient conductive paths at low filler content, resulting in high conductivity (1.11 × 104 S/m) and mechanical compliance (Young’s modulus, 89 kPa; toughness, 721 kJ/m3). When used as a wearable sensor, the hydrogel displays a high sensitivity and fast response for wireless motion detection and human–machine interaction. Furthermore, by exploiting its outstanding conductivity and electrical heating capacity, the hydrogel integrates electromagnetic shielding and thermal management functionalities. Owing to these all-around properties, our design offers a broader platform for expanding hydrogel applications.
研究领域:
材料科学
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生物医学工程
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智能传感技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER TESTING
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2020
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IF 3.275
Pingwei Zhu,Ling Weng,Xiaorui Zhang,Xiaoming Wang,Lizhu Guan,Jiahao Shi,Lizhu Liu
A new type of graphene@poly(dopamine)-Ag (Gns@PDA-Ag) core-shell nanoplatelets was designed to improve the dielectric properties of thermoplastic polyurethane (TPU) composites. The microstructure, dielectric performances and the effects of Ag nanoparticles’ content on the dielectric properties of composites were investigated. Results showed that the addition of Gns@PDA-Ag nanoplatelets could effectively improve the dielectric constant of the composite. When tested at low frequency (below 100 Hz), the highest dielectric constant of the TPU/Gns@PDA-0.78Ag (3 wt%) composite was 118.82, which was 14 times higher than that of pure TPU (8.39). This increase in dielectric constant should be attributed to the strong polarization effect of conductive graphene nanoflakes (Gns) and Ag nanoparticles to TPU molecules. The PDA shell could prevent direct contact between Gns and Ag nanoparticles, limit the formation of conductive pathways, which kept the dielectric loss of the composites at a low level and maintained the breakdown strength in a stable state. Compared with pure TPU (0.29), the minimum dielectric loss of composites was only 0.36. Moreover, after Gns@PDA-Ag nanoplatelets with higher Ag content were doped into TPU, the composite showed a higher dielectric constant, and due to the existence of the Coulomb blocking effect, the dielectric loss did not increase significantly. The scalability and simplicity of the described method will provide a promising route to polymer composites for highspeed integrated circuits and energy storage applications.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Yanli Zhang,Wei Xia,Di Wang,Zhenhua Jiang,Xinrui Wang,Mingyuan Dong,Kun Chen
Electronic skin (e-skin), an intelligent material capable of perceiving external stimuli and converting them into electrical signals, has attracted significant attention in the fields of flexible electronics and wearable sensing systems. However, the development of conductive materials that simultaneously possess high electrical conductivity, excellent mechanical robustness, and long-term durability remains a formidable challenge. Herein, we propose a “ one-stone-for-two-birds “ strategy to construct a multifunctional conductive hydrogel through precise regulation of the synergistic interactions between conductive ions and the polymer network architecture. By incorporating bio-based carboxymethyl cellulose (CMC) as a reinforcing component, the hydrogel exhibits greatly enhanced mechanical performance, with a tensile strength of up to 2.13 MPa and an elongation at break of 1950 %. Meanwhile, abundant hydrogen bonding between carboxyl groups and water molecules facilitates the formation of continuous conductive pathways, which significantly promotes ion transport and imparts superior electrical conductivity to the material. Under the combined effects of tunable salt ion environments and dynamic reversible bonding, the hydrogel also demonstrates remarkable water retention, anti-freezing capability, and self-healing properties. Benefiting from this comprehensive set of features, the conductive hydrogel serves as a highly effective flexible electrode for triboelectric nanogenerators (TENGs), enabling efficient energy harvesting. Moreover, it can be integrated into self-powered e-skin platforms with physiological signal sensing capabilities, offering promising prospects for the development of multifunctional and sustainable flexible electronic devices.
研究领域:
材料科学
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柔性电子学
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可穿戴传感器
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高分子科学
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纳米技术
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生物电子学
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能量收集
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智能材料
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2023
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IF 17.1
Yuanjian Li,Eryang Mao,Zhiwen Min,Zhao Cai,Zihe Chen,Lin Fu,Xiangrui Duan,Lingyue Wang,Chang Zhang,Ziheng Lu,Wei Liu,Zhi Wei Seh,Yongming Sun
Low-temperature lithium metal batteries are of vital importance for cold-climate condition applications. Their realization, however, is plagued by the extremely sluggish Li+ transport kinetics in the vicinity of Li metal anode at low temperatures. Different from the widely adopted electrolyte engineering, a functional interphase design concept is proposed in this work to efficiently improve the low-temperature electrochemical reaction kinetics of Li metal anodes. As a proof of concept, we design a hybrid polymer-alloy-fluoride (PAF) interphase featuring numerous gradient fluorinated solid-solution alloy composite nanoparticles embedded in a polymerized dioxolane matrix. Systematic experimental and theoretical investigations demonstrate that the hybrid PAF interphase not only exhibits superior lithiophilicity but also provides abundant ionic conductive pathways for homogeneous and fast Li+ transport at the Li–electrolyte interface. With enhanced interfacial dynamics of Li-ion migration, the as-designed PAF-Li anode works stably for 720 h with low voltage hysteresis and dendrite-free electrode morphology in symmetric cell configurations at −40 °C. The full cells with PAF-Li anode display a commercial-grade capacity of 4.26 mAh cm–2 and high capacity retention of 74.7% after 150 cycles at −20 °C. The rational functional interphase design for accelerating ion-transfer kinetics sheds innovative insights for developing high-areal-capacity and long-lifespan lithium metal batteries at low temperatures.
研究领域:
储能材料
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电化学
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电池技术
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材料科学
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纳米技术
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表面工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）