NANOTECHNOLOGY
·
2020
·Vol. 31
·期 25
·255301
·
IF 3.551
Zhijun Luo,Yanan Liu,Ziyu Liu,Duan Wang,Zongsong Gan,Changsheng Xie
The fabrication of poly 3,4-ethylene dioxythiophene (PEDOT) devices generally requires a separated strategy for EDOT polymerization and PEDOT coating, thus increasing th difficulty of their integration. With the goal of insolubility of PEDOT in a common solution, material modifications including grafting vinyl moiety groups on the side chain of the PEDOT can increase its solubility, but also markedly reduce the conductivity. Here, we report direct laser writing of pure EDOT monomer into PEDOT with a feature size of 140 nm. The PEDOT nanowire possesses the high conductivity of 1.28 × 105 S m−1 and can be patterned on solid and flexible substrates with various structures, thus paving the way towards organic highly conductive device fabrication and integration.
研究领域:
材料科学
·
有机电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOID AND POLYMER SCIENCE
·
2020
·Vol. 299
·期 4
·595-601
·
IF 1.536
Liu Li,Jiang Jianchun,Xu Zhan,Zhou Jiahang,Li Yunbo
Flexible, transparent and conductive films (TCFs) were prepared with silver nanowires (AgNWs) and the conductivity was enhanced via tuning junction resistance between nanowires treated by different surfactants and encapsulated by poly(3,4-ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS). The results showed that the conductivity of AgNW TCFs was obviously enhanced after being immersed into surfactant solutions because the AgNWs would approach each other directly after dislocating away from polyvinyl pyrrolidone (PVP) and the junction resistance sharply decreased. Moreover, the transmittance of AgNW TCFs immersed into different surfactant solutions just decreased little because the halogen ions induced the formation of silver nanoparticles on the surface of AgNWs. Besides, the conductivity of AgNW TCFs encapsulated by PEDOT:PSS was also enhanced because the charges can transfer between PEDOT chains and AgNWs with the little decrease of optical transmittance. Graphical abstract The characterization of the electrical properties of AgNW TCFs and AgNWs/PEDOT:PSS films treated by different surfactants (CTAB, CTAC and OTAC).
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jie Ren,Yunbin Wang,Zhihan Liu,Kai Liu,Xu Xiang
In non-ionic conductive hydrogels, conductivity often conflicts with mechanical properties, posing a challenge in creating hydrogels that strike a balance between conductivity and mechanical properties. Here, we addressed this issue by integrating carboxylated carbon nanotube (CNT) layers in a sandwich structure onto the surface of the cationic hydrogel (P(AM- co -DMDAAC), PAD), followed by dehydration for densification. This approach simultaneously improved the conductivity of the hydrogel while maintaining its stretchability. The stability of the composite structure was ensured through electrostatic interactions, hydrogen bonding, and physical entanglement between the PAD hydrogel and the CNT layer. Additionally, adjusting the water–solid ratio of the hydrogel allows fine-tuning of its conductivity and stretchability. Remarkably, at a 500 % water–solid ratio, the hydrogel achieved a conductivity of 2.3 S/m. By further reducing the water content, the conductivity could be increased to 25 S/m, significantly higher than similar hydrogels. The PAD-CNT hydrogel found applications in swelling response, tunable resistance wires, and as strain sensors. Notably, the sandwich structure enables the PAD-CNT hydrogel to output capacitive signals, exhibiting a more sensitive response in monitoring human movement. Overall, this study introduces a novel composite structure for conductive hydrogels, holding tremendous potential in flexible conductivity and smart response fields.
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
Materials Today Communications
·
2022
·
IF 3.662
Shuangfeng Wu,Chunchun Li,Huina Wei,Xingping Song,Laijun Liu,Jungu Xu
The tetragonal LiNbWO 6 (α−LiNbWO 6 ) with a trirutile structure was previously reported to have good lithium ion conductivity. However, the electrical properties of the hexagonal LiNbWO 6 (β−LiNbWO 6 hereafter) polymorph have not been reported yet mainly due to the difficulty to obtain single-phase. Herein, by quenching the sample from high temperature to room temperature at ambient air condition, a series of pure-phase β−LiNb 1- x Ta x WO 6 ( x = 0, 0.05, 0.1) materials were successfully prepared. The phase evolutions and conductivities of these materials were investigated by variable temperature X-ray diffraction and alternating current impedance spectroscopy techniques, respectively. The results revealed that lithium ion conduction also dominated in this hexagonal polymorph of LiNbWO 6 and an interesting great ionic conduction enhancement behavior was observed at a temperature region of 660–800 °C due to the minor phase transition from hexagonal to tetragonal. In addition, the possible ionic conducting mechanisms in both the tetragonal and hexagonal LiNbWO 6 materials were studied by the bond-valence-based method for the first time. The results disclosed two-dimensional and three-dimensional lithium ion migration pathways for the tetragonal and hexagonal LiNbWO 6 , respectively.
研究领域:
材料科学
·
电化学
·
固体化学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 44
·期 3
·780-790
·
IF 3.069
Hui Zhao,Wenming Geng,Wei-Wei Cao,Jian-Gong Wen,Tao Wang,Ying Tian,Li-Chao Jing,Xiao-Tong Yuan,Ze-Ru Zhu,Hong-Zhang Geng
Carbon nanotubes (CNTs) and graphene oxide (GO) were sprayed on flexible polyethylene terephthalate (PET) substrates to prepare CNT and GO–CNT transparent conductive films (TCFs). For the GO–CNT TCFs, when the mass ratio of GO to CNTs was 0.2, a relatively low sheet resistance of 90.4 Ω sq−1 at a transmittance of 87% (550 nm) was obtained with an average σdc/σopt value of 28.9. Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) solution without or with ethylene glycol (EG) added was sprayed on the surface of the GO–CNT films to obtain P/GO–CNT and P(E)/GO–CNT films, respectively. P(E)/GO–CNT films were post-treated with sulfuric acid to obtain P(E,S)/GO–CNT TCFs. The addition of PEDOT:PSS can permeate into the pores of networks and densify the GO–CNT networks, increasing the conductivity and wettability and decreasing the roughness of the films. Additional EG can reduce the Coulomb force between PEDOT and PSS and change the morphology of PEDOT, and at the same time sulfuric acid treatment can effectively remove PSS from the PEDOT:PSS layer. The P(E,S)/GO–CNT 0.2 TCFs exhibited a sheet resistance of 46.3 Ω sq−1 at a transmittance of 87.5% (550 nm) with an average σdc/σopt value of 56.1. The organic light emitting diodes were successfully fabricated, and the mechanism of how the electrical conductivity of the hybrid film increased was also investigated.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Qi Zhou,Chenjing Huang,Shengxu Lu,Hatem Abushammala,Daqian Gao,Pengwu Xu,Deyu Niu,Weijun Yang,Piming Ma
Conductive hydrogels have attracted significant research interest in flexible electronics owing to their intrinsic flexibility and biocompatibility. However, the rapid and sustainable fabrication of green conductive hydrogels with excellent mechanical and conductive properties remains a significant challenge. Inspired by the structure of human skin, modified polysaccharide-reinforced polyvinyl alcohol (PVA) ionic conductive hydrogels with tailored properties were developed through Zn 2+ coordination and Hofmeister effect. The results demonstrated that precisely tunable mechanical properties ( σ = 0.39–1.93 MPa, ε = 501–1010 %) and conductivity (IC = 0.26–1.10 S/m) were achieved through the regulation of ionic concentrations at relatively low levels. The enhancement in both mechanical and conductive properties arose from multiscale interactions, including the formation of dense nanofibril networks and crystalline domains, alongside multiple metal coordination and hydrogen bonding interactions. Meanwhile, the conductive hydrogel exhibits a low strain detection limit (2 %), highlighting its promising applications in human health monitoring. Crucially, a wireless information transmission system was developed based on this ionic conductive hydrogel, aimed at facilitating information transmission for deaf-mute individuals. This work presents an eco-friendly and biomimetic strategy for fabricating ionic conductive hydrogels with tailored properties, expanding their advanced applications in flexible sensing.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Qi Zhou,Shengxu Lu,Chenjing Huang,Debora Puglia,Pengwu Xu,Deyu Niu,Weijun Yang,Piming Ma
Despite the significant advantages of conductive hydrogels in flexible sensing, their further development is often hindered by limitations in strength and conductivity. In this work, the ionic conductive hydrogels with tunable mechanical and conductive properties were designed by utilizing sodium alginate (SA) to reinforce the polyvinyl alcohol (PVA) networks, followed by the respective introduction of Li 2 SO 4 , ZnSO 4 , and Fe 2 (SO 4 ) 3 , leveraging the Hofmeister effect and metal coordination. Consequently, the mechanical properties ( σ = 0.40–2.70 MPa) and conductivity (IC = 0.18–1.02 S/m) can be extensively tuned by adjusting the metal salts with varying oxidation states. Notably, Fe 3+ ions can significantly enhance the mechanical properties, while Li + ions more effectively improve conductivity. Interestingly, the PVA/SA/Zn 2+ hydrogel achieves a balance between mechanical properties ( σ = 1.86 MPa, ε = 1110 %) and conductivity (0.92 S/m), ascribing it to the multiple interactions including densification of polymer networks, formation of nanocrystalline domains, and ionic coordination effects. Furthermore, the conductive hydrogel also exhibits low strain detection limit (2.0 %), and demonstrated enormous potential in personal health monitoring and information transmission applications. This work presents a highly efficient and eco-friendly strategy for constructing hydrogels with tunable properties, while elucidating the mechanisms behind the enhanced mechanical and conductive performance.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CELLULOSE
·
2022
·Vol. 29
·期 3
·1897-1909
·
IF 6.123
Li Miao,Yang Yutong,Yue Chengbin,Song Yongming,Manzo Maurizio,Huang Zhenhua,Cai Liping
Abstract Conductive hydrogel (CH) strain sensors have made significant progress in wearable electronic products in recent years. However, the use of aqueous solvents as the dispersion medium in CHs largely limits the scope of applications of CHs and impedes the combination of the mechanical properties and ionic conductivity, which is urgently desired to be addressed. Herein, a simple one-pot preparation of anti-freezing, anti-drying ionic CHs with high stretchability (up to 869%), toughness (6.60 MJ/m 3 ), and Young's modulus (0.56 MPa) was proposed. These CHs consist of polyvinyl alcohol, tannic acid, and sodium chloride dispersed in a solvent consisting of glycerol and cellulose nanofiber suspension. The thus-synthesized CHs exhibit good ionic conductivity (~ 0.86 S/m) and strain sensitivity (gauge factor of 8.54). The organohydrogel possesses a sensitive strain sensing capability and a wide-working temperature range (−50 °C to 60 °C), and good stability (30 d in room-temperature) to detect human movement, such as large (joint movement) and subtle movements (voice in the throat). These advantages allow organohydrogel sensors to show great potential for electronic skin, personal healthcare, and flexible wearable devices. Graphical abstract
研究领域:
材料科学
·
生物医学工程
·
柔性电子
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Peng-Fei Qian,Wen-Hao Geng,Ze-Long Bao,Li-Chao Jing,Di Zhang,Hong-Zhang Geng
In this study, gentianic acid (GtA) was first doped into poly (3,4-ethylenedioxythiophene): poly (styrene-sulfonic) (PEDOT:PSS), and the doped PEDOT:PSS (GP) was spin-coated as a hydrophilic layer on the surface of relatively hydrophobic polyethylene terephthalate (PET) films. After that, silver nanowires (AgNWs) aqueous dispersion and hydroxypropyl methyl cellulose (HPMC) solution were coated over the surface of PET films. Finally, the GP/AgNWs/HPMC flexible conductive films were stripped from the PET surface, achieving a high visible light transmittance (81.5 % at 550 nm) with low sheet resistance (4.2 Ω/□). By embedding AgNWs on the surface of the HPMC film, the surface roughness ( R q) of this flexible transparent conductive film (TCF) was as low as 3.2 nm, meeting the requirements for the fabrication of organic light-emitting diode (OLED) devices. The OLED device fabricated via using this TCF as the anode achieved a maximum brightness ( L max ) of 13,740 cd/m 2 , a maximum current efficiency ( C.E. max ) of 10.6 cd/A, a maximum power efficiency ( P.E. max ) of 5.5 lm/W and a maximum external quantum efficiency ( EQE max ) of 2.9 %. Furthermore, HPMC demonstrated solubility in water at ambient temperature, facilitating the recycling of AgNWS and mitigating environmental pollution. These findings provide a new scope for the application of TCF in recyclable flexible electronic devices.
研究领域:
材料科学
·
电子工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2024
·Vol. 8
·期 1
·1-12
·
IF 23.2
Hao Changxiang,Chen Junde,Chen Yonghao,Jiang Chengwei,Wang Ziqiang,Pan Tingting,Cheng Xing,Tian Yanqing
Array-patterned anisotropic conductive films (A-ACFs) possessing periodically arranged conductive particles distributed in curable resins can have high circuit-bonding precision; however, the preparation of A-ACFs is a challenging work. On the other hand, the traditional electrolysis coating of metal on polymer cores as the conductive particles needs long preparation steps. Herein, a new simplified approach uses polyaniline (PANI) as an intermediate layer to wrap the polystyrene (PS) microspheres and also chelate silver to prepare silver-coated PS microspheres (PS@PANI@Ag). Through a series of experimental regulation, neat PS@PANI@Ag microspheres with an average diameter of 4.73 ± 0.13 μm possessing a silver layer of about 65 nm and weight percentage of 23.6% were prepared. For developing A-ACFs, an approach is loading the prepared particles into the microcavities with a diameter of 6 μm and depth of 4 μm in silicon template through rubbing assembly process, transferring these particles onto the surface of a kind of chosen polymerizable acrylate resin to keep their periodicity, and embedding these particles in the polymeric resin films. These A-ACFs were used to bond indium-tin-oxide (ITO) and flexible-printed circuits (FPC) with 200-μm spacing to achieve low connection resistance of 1.78 ± 0.03 Ω/0.4 mm 2 and high insulation resistance over 200 MΩ. After aging at 85 °C and 85% relative humidity condition for 120 h, the connection resistance change is less 9.8%, showing the bonded device’s good environmental stability. The anisotropic property was also demonstrated using a homemade device through turning LEDs on or off. Therefore, the conductive particles’ and A-ACFs’ preparation methods may provide new insights for ACFs’ designing strategy and application in industry. Graphical
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
MATERIALS SCIENCE FORUM
·
2020
·
IF 0
Qiang Zhang,Meng Hao Li,Ru Xiu Wang,Jia Jia Song,Bin Wang,Xin Li,Xiu Juan Fan,Ji Guang Liu
Thermosensitive conducting composite particles were synthesized using the unsulfonated P(St-NIPAm) as a thermosensitive substrate. A series of characterizations have been performed to study the effects of thermosensitive PANI@poly (St-NIPAm) conductivity performance. Aniline diffused into P(St-NIPAm) particles in solution, and then polyaniline (PANI) was in-situ produced in P(St-NIPAm) particles through oxidation polymerization. The samples showed different particle sizes at different temperatures. The content of conducting polyaniline is dependent on NIPAm feed ratios. The particle electrical conductivity was improved with the increasing NIPAM feed ratios and exhibited thermal responsive electrical conductivity. The thermosensitive conducting composite particles will have wide applications in sensors, for example, they could be used to fabricate smart conductive gel responsive to temperature and moisture.
研究领域:
材料科学
·
化学
·
纳米技术
·
电气工程
·
传感器技术
✓ 已验证
DOI
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Ziming Fu,Wenhao Cao,Changyu Qin,Chuang Ning,Ming Liu,Zequan Li,Zhiyong Qin,Shuangliang Zhao,Wei Gao
Conductive adhesives offer considerable promise in areas such as disaster warning and structural bonding in timber buildings. However, current conductive adhesives suffer from low bonding strength, poor interfacial adhesion, low cohesive strength, and low sensitivity. Conventional wood adhesives consume considerable energy due to their reliance on hot pressing. Here, this work introduced a styrene–butadiene rubber-based conductive wood adhesive with high environmental sensitivity, developed using interfacial polarity modification and functional filler doping. This conductive adhesive exhibited exceptionally high cold-press lap shear strength (dry shear strength of 3.67 MPa and wet shear strength of 1.80 MPa), strong interfacial adhesion (rapid bonding to polar, nonpolar, and inorganic surfaces), high conductivity (adhesive film conductivity of 0.13 S m–1), and outstanding cohesive strength (5.28 MPa). Exploiting these superior properties, a multilayered (wood-adhesive-wood) environment-sensitive sensor can rapidly identify various early disaster signals, including vibration, temperature rise, and combustion. This study introduced strategies for developing low-energy, high-strength conductive adhesives for timber buildings, thus opening innovative avenues for early disaster warning in timber buildings.
研究领域:
材料科学
·
结构工程
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）