ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 34
·期 52
·2411390
·
IF 18.5
Mingze Zeng,Jie Ding,Yuan Tian,Yusheng Zhang,Xiaoyin Liu,Zhihong Chen,Jing Sun,Chengheng Wu,Huabing Yin,Dan Wei,Hongsong Fan
Piezoresistive pressure sensors, analyzing and converting external pressure signals to readable electrical signals for monitoring human health, are always subjected to simultaneously possess high signal-linearity and signal sensitivity. Analogous to the control of sophisticated microstructure for increasing active sensing area, the control of gradient conductivity should enable a linear response via regulating the formed saturation current. Here, inspired by phase separation showing the feasibility of controlling material microstructure and conductivity, a high-performance flexible pressure sensor via the simultaneous control of microgroove structure and wide-range gradient conductivity is demonstrated. First, a laser-etching and dopamine (DA)-doping synergistic approach is used to induce selective phase separation in poly(3,4-ethylenedioxythiophene): poly(styrenesulfonic acid) (PEDOT:PSS), achieving broad conductivity modulation (from 297 to 4525 S cm −1 ) and precise microgroove pattern (15.5 µm). Then, by designing conductivity-gradient PEDOT: PSS-based multi-sublayers and microgroove interlocked structure, the sensor shows extraordinarily comprehensive performance of excellent stress-sensing sensitivity (4 × 10 5 kPa −1 ), high linear responsiveness (99.85%) and wide-range sensing ability (up to 100 kPa). Consequently, this sensor reveals excellent capability in detecting multi-mode pressure changes and is expected to branch out into other electronic device designs as a general strategy for the precise manipulation of material physical-chemical properties.
研究领域:
材料科学
·
生物医学工程
·
电子器件设计
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zuomin Lei,Dingkun Tian,Xuebin Liu,Jianhong Wei,Krishnamoorthy Rajavel,Tao Zhao,Yougen Hu,Pengli Zhu,Rong Sun,Ching-Ping Wong
Lightweight and compressible composite foams consisting of silver fractal dendrites (AgFDs), carbon nanotubes (CNTs) and thermoplastic polyurethane (TPU) are developed through layer-by-layer construction, followed by freeze-drying. The construction of AgFD/TPU layers through depositing AgFD layers followed by low-temperature sintering and incorporating of TPU endows the AgFD/TPU layers with excellent electrical conductivity. Meanwhile, the electrically conductive gradient CNT/TPU layers constructed by layer-by-layer method greatly decrease the reflection of the electromagnetic (EM) waves and prolong the EM wave dissipation paths. The unique low reflection–absorption-high reflection-reabsorption paths of the EM wave dissipation mechanism facilitates the composite foams with thickness of 3.4 mm to obtain an excellent EMI SE of 88.5 dB and an ultra-low SE R of 0.29 dB at an extreme low AgFD loading of 0.103 vol%. Additionally, benefitting from direction freezing, the composite foams exhibit good cyclic compression recovery. This work puts forward a new insight for designing and constructing ultra-efficient absorption-dominated EMI shielding materials with electrically conductive gradient layers, and the prepared shielding materials are highly promising for applications in the EMI protection of modern electronic products.
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
CARBOHYDRATE POLYMERS
·
2025
·
IF 12.5
Chunxia Tang,Jian Liu,Yifan Wang,Yunshan Mao,Kaishuang Zhang,Shaohai Fu
Most reported shielding materials exhibit reflection-dominated shielding mechanisms, which further leads to the secondary electromagnetic radiation contamination. This work reports a low reflective and scalable cellulose paper- based EMI shielding composite (ACMA) with a sandwich structure via assembling of the MXene containing aerogel layer, MXene coated paper (MP) layer, and highly conductive AgNWs/CNF film (AC) layer in a conductivity gradient. The shielding performances and mechanisms of each layer, AC-MP bi-layer, and AC-MP-aerogel tri-layer are investigated. Results show that the AC film could significantly increase the EMI SE of MP but produce super high R coefficient (0.92). The aerogel layer is effective in decreasing the R coefficient, which is correlated with its MXene content and thickness. The ACMA yields an average EMI SE of 71.46 dB and ultralow R coefficient of 0.1 in the X band when the aerogel has a MXene/BC of 90 % and a thickness of 2.6 mm. A large size ACMA is showcased, and it achieves an average EMI SE ranging from 56.82 dB to 75.85 dB in 2–18 GHz and an absorption- dominated shielding mechanism in 8–18 GHz. In addition, the ACMA also demonstrates excellent thermal camouflage property as the aerogel layer contacts the object.
研究领域:
材料科学
·
电磁功能材料
·
纳米复合材料
·
生物基材料
·
屏蔽技术
·
热伪装
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Meng Yu,Xiaohui Ning
Li metal with ultra-high theoretical capacity is a promising anode for next-generation high-energy–density battery technologies. Nevertheless, the uncontrolled Li dendrite growth, continuous interfacial side reactions and irregular volume expansion bring about rapid capacity decay of Li metal anodes (LMAs). Herein, we design a bilayer host structure with an electronic conductivity gradient through a facile blade coating strategy to regulate Li deposition behavior. The electronic-insulative Si 3 N 4 top layer prevents the apical growth of Li dendrites and promotes the penetration of electrolytes into the host so as to lower electrode polarization. The carbon black/LiNO 3 mixed bottom layer creates mixed electronic-ionic conductive network to enhance the charge transfer kinetics of Li ions and lower Li nucleation barrier. Moreover, we first discover that the Si 3 N 4 protective layer avoids the cell failure resulting from the dissolution of LiNO 3 in ether electrolytes, enabling the Si 3 N 4 -C/LiNO 3 electrode to operate smoothly for over 600 cycles, delivering an average Coulombic efficiency of up to 98.65 %. Furthermore, the Si 3 N 4 -C/LiNO 3 -composited LMAs paired with 10.5 mg cm −2 LiFePO 4 cathodes achieve 200 stable cycles at a low N/P ratio of 1 under corrosive carbonate ester electrolytes, with an anode capacity utilization ratio as high as 50 %. This is the first report on the LiNO 3 -modified host materials that exhibit superior electrochemical properties in ether electrolytes, shedding a new light on the structural design of LMAs to enable high-energy–density Li metal batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
界面化学
·
电池技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）