CHINESE JOURNAL OF POLYMER SCIENCE
·
2023
·
IF 4.3
He Zhen-Hang,Liu Guang-Feng,Zhou Ze-Kun,Liu Zhen,Zeng Yi-Shu,Zhang Peng
Poly(3,4-ethylenedioxythiophene) (PEDOT) is one of the most successful conductive polymers that recently has been used in wearable sensors for human health monitoring. In this work, we prepared a series of PEDOT hybrids consisting of PEDOT, sodium poly(styrene sulfonate) (PSSNa) and polyethylene oxide (PEO), and their preparation could be scaled-up via an adapted solid-state polymerization process. The resistance of the as-prepared PEDOT:PSS/PEO hybrid shows clear temperature response, i.e. , it decreases almost linearly with the temperature increase. To understand this phenomenon, the in situ synchrotron radiation wide- and small-angle X-ray scattering (WAXS/SAXS) characterizations were undertaken to study the temperature-dependent microstructure change of the PEDOT:PSS/PEO hybrid. It demonstrated that PEDOT formed conductive paths in the hybrids, which were not destroyed by the PEO crystallization. As temperature increased, the PEO crystals’ melting and the accompanying reorganization of PEDOT chains endowed the hybrid sample temperature responsiveness. Based on these fundamental knowledges, the hybrid materials were used to fabricate flexible wearable sensor that showing temperature sensing performance with an accuracy of 1 °C. These findings shed lights on the scalable manufacturing of wearable sensors for body temperature monitoring.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Liao Ziming,Zhu Ximing,Zhang Shuquan,Liu Tingting,Song Jiamei,Wang Yuhong,Guo Yanping,Li Xiaohong,Ji Xiaoyuan,Yao Bin
As an integral component of physiological monitoring platforms, epidermal sensors hold broad application prospects in the medical field. Nevertheless, ensuring outstanding mechanical properties and electrical conductivity while maintaining stability under diverse physiological conditions remains a formidable challenge. In this study, a self-healing physiological monitoring epidermal sensor featuring an adaptive adhesion function and a dual conductance path design was developed. This innovative design enables the sensor to automatically adjust its performance under different physiological conditions, thereby adapting to the dynamic changes on the skin surface. The self-healing function guarantees that the sensor regains functionality within 10 min after minor damage. The design of the double conductive path enhances the stability and accuracy of the signal, with the impedance at each frequency being less than 2*10 3 Ω, providing more accurate data for physiological monitoring. Additionally, the sensor exhibits excellent biocompatibility and anti-fatigue properties. Moreover, with the assistance of deep learning technology, a motion recognition system for this epidermal sensing device is designed to accurately identify human movement behavior. This work demonstrates the potential of an efficient sensing system and an intelligent recognition system to be utilized in potentially transformative flexible wearables.
研究领域:
生物医学工程
·
材料科学
·
人工智能
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2020
·
IF 6.444
Jinzheng Yang,Yanling Xu,Yangyang Song,Gongkai Wang,Fuxing Yin,Haitao Liu,Wenjing Yuan
Fiber-based architectures exhibit remarkable advantages in wearable electronics. Despite the various techniques to achieve strain sensitive fibers, important factors concerning the sensing performance, e.g. fiber arrangement, have been rarely explored. Herein, various fiber sensing patterns with anisotropic and isotropic microstructures were fabricated, and their localized strain distribution and conductive pathway configuration were tailored through fiber alignment. The sensing performance and mechanisms were investigated based on experimental characterization and theoretical modeling. We find out that the fibers arrangement strongly determines their strain sensitive behavior including sensitivity and sensing range. Additionally, by introducing a mechanical-guided step to realize a constant microcrack density in the fiber patterns, strain sensitivity and stability can be further improved. As a proof of concept, we integrated two fiber array sensors into a strain sensing system to simultaneously achieve an ultrahigh sensitivity (gauge factor up to 9540) and a wide sensing range (0.01–110%) as well as fast response.
研究领域:
材料科学
·
电子工程
·
传感器技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Lei Li,Guolan Wei,Hengji Liu,Yongde Guo,Yingying Ma
Traditional nanofiber-hybrid proton exchange membranes (PEMs) are limited in their further application due to differences in proton conductivity between vertical and horizontal orientations. In this study, we design and synthesize a novel type aminated flower-shaped ZnO@Al 2 O 3 nanofibers and then filling its three-dimensional interstices with sulfonated polysulfone (SPSF) to obtain a nanofiber composite proton exchange membrane (ZANFs/SPSF). The Al 2 O 3 nanofibers provide long-range and stable proton transport nanochannels in plane, while the flower-shaped ZnO on its surface provide additional vertical transport channels for protons. This combination of 1D and 2D conductive pathways forms a typical 3D hierarchical proton conductive configuration, optimizing the proton transfer pathway. Specifically, the amino groups (-N-H) on the nanofibers surface not only form acid-base pairs with sulfonic acid groups (-SO 3 H), providing a rich hydrogen bonding network for proton hopping, but also have a similar structure to the polyether sulfone groups (–SO 2 –NH-), which significantly improves the compatibility between the nanofibers and SPSF. Additionally, the flower-like pleated surface of the nanofibers has a high contact area with the SPSF, providing more proton hopping sites, improving the utilization efficiency of proton carriers, and also resulting in a more stable structure. Moreover, the crosslinked network of nanofibers serves as a barrier to further inhibit methanol permeation. The ZANFs/SPSF exhibits excellent parallel proton conductivity of 348 mS cm −1 at 80 °C and 100% RH, which is 2.7 times higher than that of SPSF under the same conditions, and achieves a peak power density of 405.7 mW cm −2 . This approach presents a unique perspective for the preparation of high-performance PEMs for methanol fuel cells.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
·
2021
·Vol. 218
·期 21
·2100501
·
IF 1.981
Hongjun Wang,Hong Wei,Xiong Zeng,Jing Zhou,Yuanyuan Zhu
Halide perovskites are intensely studied due to their potential excellent properties in electronic devices. However, the toxicity of lead remains as an obstacle on their way toward large-scale applications. Herein, the lead-free all-inorganic perovskite CsSnBr 3 film is used as the switching layer to construct nonvolatile resistive switching (RS) memories and the underlying switching mechanism is systematically explicated. Both memories with Ag/CsSnBr 3 /Pt and Pt/CsSnBr 3 /Pt structures exhibit reproducible bipolar RS characteristics, including the large on/off ratios and low reset currents. The RS characteristics are attributed to the formation/rupture of nano-cone-shaped conductive paths under external voltage bias. In addition, compared with Pt/CsSnBr 3 /Pt device, the Ag/CsSnBr 3 /Pt device manifests lower operation set/reset voltages, revealing the formation of higher density or stronger conductive paths. This work might pave the way for the lead-free all-inorganic perovskite-based RS memory devices in high performance emerging commercial applications.
研究领域:
材料科学
·
电子器件
·
记忆体技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Xuexian Wu,Shujing Chen,Danni Liu,Chunyi Ye,Fengzhan Si,Yan Zhang,Yang Yang,Jing-Li Luo,Xian-Zhu Fu
The current collector is a critical component of lithium-ion batteries (LIBs). Herein, copper-coated polymer films (P@Cu) with through-hole arrays are developed lightweight and flexible current collectors. The through-hole arrays are created by laser drilling the polyimide film substrate. P@Cu composite current collectors are fabricated by electroless Cu deposition on polyimide films with through-hole arrays, which form three-dimensional conductive paths . As the anode current collector for LIBs, P@Cu exhibit a total electrode mass-specific capacity that is 54.58 % higher than that of the commercial Cu foil. Due to the polyimide substrate, the tensile deformation of P@Cu is 6.69 % higher than that of the commercial Cu foil. After 30,000 bending cycles, the conductivity of P@Cu is only reduced by 3.39 %, while the commercial Cu foil current collectors have broken by this point. The P@Cu composite foils with through-hole arrays are high-performance lightweight and flexible current collectors for LIBs.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
功能高分子材料
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Yifan Zhi,Jia Xu,Jianlei He,Jiahan Xu,Huanxia Zhang
Graphene is a promising reinforcement for fiber composite materials in flexible wearable applications because of its exceptional conductivity. Researchers have focused on bridging the gap between the intrinsic conductivity of graphene and the macroscopic performance of composite materials. The anisotropy of 2D nanomaterials indicates that their orientation and distribution are crucial factors in determining the macroscopic performance of thin films and bulk materials. Various technologies developed to control the formation of microstructures include electric and magnetic field methods, hot pressing, centrifugation, and freeze-drying. In this study, we prepared flexible graphene/cellulose composite film materials and used magnetic fields to regulate the orientation and distribution of graphene within cellulose paper. Results show that the grid structure of graphene arranged on the composite material produced interconnected conductive paths and reduced the graphene permeation threshold. By giving the conductive layer a higher dielectric constant, we prevented its breakdown as a conductive film. Electroluminescent devices were constructed using graphene/cellulose flexible composite materials and achieved an effective improvement in luminescence performance. Furthermore, directional luminescence was obtained through a microstructure design. This study provides a feasible path for using 2D nanomaterials in high-performance, flexible wearable devices.
研究领域:
材料科学
·
纳米技术
·
电气工程
·
复合材料
✓ 已验证
产品关联
DOI
高影响因子
Nature Energy
·
2022
·Vol. 7
·期 4
·329-339
·
IF 67.439
Liu Xin,Xie Na,Xue Jiandang,Li Mengyuan,Zheng Chenyang,Zhang Junfeng,Qin Yanzhou,Yin Yan,Dekel Dario R.,Guiver Michael D.
Through-plane (TP) conducting pathways in anion-exchange membranes (AEMs) are desirable for AEM fuel cells as they serve as short and efficient routes for hydroxide ion transport between electrodes, improving power output. Electric and magnetic fields have previously been used to create TP-oriented structures in AEMs, but with modest performance gains. Here we use paramagnetic ferrocenium polymers to prepare TP-oriented AEMs under a magnetic field. The magnetic field induces a mixed-valence state, which effectuates higher anion dissociation and enhanced alkali/redox stability. Our AEMs display a promising TP hydroxide conductivity of ~160 mS cm −1 at 95 °C in water, and no appreciable hydroxide conductivity loss over 4,320 h at 95 °C in alkali. The assembled fuel cells achieve a power output of 737 mW cm −2 at 80 °C and 80% relative humidity, and a durability of 3.9% voltage loss and 2.2% high-frequency resistance increase over 500 h at 500 mA cm −2 , 120 °C and 40% relative humidity.
研究领域:
材料科学
·
电化学
·
能源技术
·
聚合物科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xin Li,Zhenhang He,Zhen Liu,Yu Chen,Zekun Zhou,Guixiang Chen,Weiheng Qi,Daniel Rauber,Christopher W. M. Kay,Peng Zhang
In this work, post-treatment-free polymer hybrids, consisting of poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) and ionic liquids (ILs), were fabricated for the thermoelectric (TE) application. By optimizing the ILs’ molar concentration (0–0.5 M) and chemical composition, that is varying the cyano-based anions coupled with 1-ethyl-3-methylimidazolium cations, a high TE performance (power factor of 190 μW m −1 K −2 ) was achieved. The excellent TE performance was attributed to the conductive network under the coupling effect of molecular structure (such as oxidation level, conformation and crystallization of PEDOT chains) and microstructure (long-range ordered conductive paths). Especially, the long-range conductive paths were proved to be made of rod-like microdomains, based on detailed structure analysis with micro-Fourier transform infrared spectroscopy and small-angle X-ray scattering. These paths enabled carrier transport among microdomains of PEDOT:PSS/IL hybrids. Moreover, the conductive network of PEDOT:PSS/IL hybrids showed good environmental and mechanical stability, enabling the fabrication of flexible TE generators.
研究领域:
材料科学
·
热电学
·
高分子科学
·
纳米技术
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Shi Wang,Xu Liu,Ailian Wang,Zhinan Wang,Jie Chen,Qinghui Zeng,Xiaorui Jiang,Henghui Zhou,Liaoyun Zhang
All-solid-state polymer electrolytes (SPEs) have aroused great interests as one of the most promising alternatives for liquid electrolyte in the next-generation high-safety, and flexible lithium-ion batteries. However, some disadvantages of SPEs such as inefficient ion transmission capacity and poor interface stability result in unsatisfactory cyclic performance of the assembled batteries. Especially, the solid cell is hard to be run at room temperature. Herein, a novel and flexible discotic liquid-crystal (DLC)-based cross-linked solid polymer electrolyte (DLCCSPE) with controlled ion-conducting channels is fabricated via a one-pot photopolymerization of oriented reactive discogen, poly(ethylene glycol)diacrylate, and lithium salt. The experimental results indicate that the macroscopic alignment of self-assembled columns in the DLCCSPEs is successfully obtained under annealing and effectively immobilized via the UV photopolymerization. Because of the existence of unique oriented structure in the electrolytes, the prepared DLCCSPE films exhibit higher ionic conductivities and better comprehensive electrochemical properties than the DLCCSPEs without controlled ion-conductive pathways. Especially, the assembled LiFePO4/Li cells with oriented electrolyte show an initial discharge capacity of 164 mA h g–1 at 0.1 C and average specific discharge capacities of 143, 135, and 149 mA h g–1 at the C-rates of 0.5, 1, and 0.2 C, respectively. In addition, the solid cell also shows the first discharge capacity of 124 mA h g–1 (0.2 C) at room temperature. The outstanding cell performance of the oriented DLCCSPE should be originated from the macroscopically oriented and self-assembled DLC, which can form ion-conducting channels. Thus, combining the excellent performance of DLCCSPE and the simple one-pot fabricating process of the DLC-based all-solid-state electrolyte, it is believed that the DLC-based electrolyte can be one of the most promising electrolyte materials for the next-generation high-safety solid lithium-ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
高分子化学
·
纳米技术
✓ 已验证
DOI
高影响因子
NEW CARBON MATERIALS
·
2023
·
IF 5.7
Xian-lan Ke,Yu-heng Lu,Jin-lun Wu,Ding-cai Wu
We report the fabrication of vulcanized cross-linked polystyrene grafted on carbon nanotubes (CNTs) for use as an advanced three-dimensional Li host. First, polystyrene was grafted from Br-modified CNTs to form brush-like structure by surface-initiated atom-transfer radical polymerization. Polystyrene grafted on carbon nanotubes was then cross-linked using a Friedel-Crafts reaction and finally vulcanized with sulfur. Vulcanized cross-linked polystyrene grafted on carbon nanotubes was used as a support for the Li metal, and its macro-, meso- and microporous structure increased Li ion transport, buffered the volume changes of the Li anode, and provided a high specific surface area to reduce local current density, which assisted rapid and uniform Li plating/stripping. At the same time, the homogenously distributed sulfur in the support reacted with Li to produce a Li 2 S-containing SEI layer, while the CNTs provided conductive pathways for the rapid transmission of electrons. As a result, a Li|Li symmetric cell using this anode material and a Cu current collector had a stable cycling performance of more than 500 h at a current density of 1 mA cm −2 . When LiFePO 4 was used as the cathode, a full cell had a high discharge capacity of 101 mAh g −1 with a capacity retention of 77% after 600 cycles at 1 C.
研究领域:
材料科学
·
电化学
·
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）