APPLIED SURFACE SCIENCE
·
2018
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IF 4.439
Yun Mou,Hao Cheng,Hao Wang,Qinglei Sun,Jiaxin Liu,Yang Peng,Mingxiang Chen
Stability of conductive ink and mechanical flexibility of conductive pattern are essential for flexible printed electronics. In this work, we reported a stable reactive silver ink for the facile fabrication of flexible electrodes. The ink was mainly composed of silver-isopropanolamine (IPA) complex, formic acid reductant, and hydroxyethyl cellulose (HEC) adhesive agent, and it displayed good chemical stability. The flexible electrodes on polyimide (PI) substrates were achieved by mask-printing and thermal sintering of the ink, and the effects of sintering parameters and HEC adhesive agent content on the electrical and flexible properties and microstructure evolutions of silver layer were systematically investigated. Consequently, the silver layer sintered at 110 °C yields low electrical resistivity of 12.1 μΩ·cm, which is only eight times higher than that of bulk silver. Furthermore, the sintered silver layer still presents excellent flexibility and low relative resistances after the bending, twisting, and folding tests. These results demonstrate that the stable reactive silver ink provides a promising and low cost opportunity for low temperature design and fabrication of high performance flexible printed electronics.
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
Journal of Materials Chemistry A
·
2024
·
IF 10.7
Baohao Yang,Jianhui Zeng,Ting Liang,Meng Han,Chenxu Zhang,Jian-Bin Xu,Yimin Yao,Rong Sun
The rapid advancements in high-density packaging underscore the critical demand for advanced thermal interface materials (TIMs). Developing TIMs with exceptional mechanical flexibility, robust interfacial adhesion, minimal thermal resistance, and superior thermal stability presents a significant challenge. Here, we introduce poly(ionic liquid)s (PILs) as the matrices for TIMs, representing an initial investigation into the feasibility of PIL-based TIMs. Specifically, poly(1-octyl-3-vinylimidazole) bis(trifluoromethanesulfonyl)imide (P[OVIm]NTf2) shows a remarkable tensile elongation (>2300%), strong interfacial adhesion (6.9 MPa with steel, 6.6 MPa with copper), elevated thermal decomposition temperature (>240 °C in air), excellent thermal stability (no mass loss at 150 °C), rapid self-healing capability, and reprocessability. As a proof of concept, liquid metal (LM) was utilized as a filler within P[OVIm]NTf2 matrix to fabricate TIMs containing a substantial LM content (>60 vol%). The P[OVIm]NTf2/LM visco-elastomers achieve a remarkable thermal conductivity of 3.2 W m−1 K−1. Furthermore, the composites display an elongation of 109% while maintaining strong interfacial adhesion (0.95 MPa) with steel. In a practical application scenario, the P[OVIm]NTf2/LM visco-elastomers efficiently disperse heat, highlighting their potential practical utility. This study presents a novel approach by advocating the use of PILs as an alternative to conventional silicone matrices, thereby validating the potential application of PILs in the TIM domain.
研究领域:
材料科学
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热管理技术
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Yueqi Yang,Saizheng Wang,Siqi Wang,Chang Wang,Yunhong Jiao,Hongmei Liu,Haiyun Ma
Flexible polyurethane foams (FPUFs) are widely used in various industries due to its high rebound characteristics, but its inherent flammability significantly affects its application. In this study, inspired by the structure of shell nacre, an aerogel coating with gelatin, boric acid and tetrakis hydroxymethyl phosphonium sulfate (THPS) as raw materials was designed. Owing to the hydrogen bonding interactions among the above molecules, the aerogel coating exhibits strong interfacial adhesion to the FPUF substrate, and the peel strength even surpasses the intrinsic strength of the FPUF matrix. Moreover, the coated FPUFs exhibit exceptional flame retardant and thermal insulation properties. The LOI value reaches as high as over 80 % and easily achieves a UL-94 V0 rating. During combustion, the coated FPUFs illustrate extremely low heat and smoke release. Meanwhile, the coated FPUFs still maintain excellent resilience. In addition, the THPS endows coated FPUFs with excellent antibacterial properties and exhibits a highly inhibition against Escherichia coli and Staphylococcus aureus .
研究领域:
材料科学
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生物仿生学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Shaohui Peng,Chenxu Liu,Junhui Tan,Pengxiang Zhang,Junjie Zou,Yunfan Wang,Yanan Ma,Xin Zhang,Ce-Wen Nan,Bao-Wen Li
MXene inks offer a promising avenue for the scalable production and customization of printing electronics. However, simultaneously achieving a low solid content and printability of MXene inks, as well as mechanical flexibility and environmental stability of printed objects, remains a challenge. In this study, we overcame these challenges by employing high-viscosity aramid nanofibers (ANFs) to optimize the rheology of low-concentration MXene inks. The abundant entangled networks and hydrogen bonds formed between MXene and ANF significantly increase the viscosity and yield stress up to 103 Pa·s and 200 Pa, respectively. This optimization allows the use of MXene/ANF (MA) inks at low concentrations in direct ink writing and other high-viscosity processing techniques. The printable MXene/ANF inks with a high conductivity of 883.5 S/cm were used to print shields with customized structures, achieving a tunable electromagnetic interference shielding effectiveness (EMI SE) in the 0.2–48.2 dB range. Furthermore, the MA inks exhibited adjustable infrared (IR) emissivity by changing the ANF ratio combined with printing design, demonstrating the application for infrared anticounterfeiting. Notably, the printed MXene/ANF objects possess outstanding mechanical flexibility and environmental stability, which are attributed to the reinforcement and protection of ANF. Therefore, these findings have significant practical implications as versatile MXene/ANF inks can be used for customizable, scalable, and cost-effective production of flexible printed electronics.
研究领域:
材料科学
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电子工程
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Xu Zhou,Xiao-Ai Ye,Xu Zhang,Dong Wen,Hong Wang,Gui-Gen Wang
The increasingly serious electromagnetic radiation and electronic waste pose a significant threat to public health and the operation of electronic devices. Despite the enormous potential of highly conductive Ti 3 C 2 T x MXene-based electromagnetic interference (EMI) shielding materials, significant challenges persist in terms of mechanical flexibility and antioxidation. In this study, it was firstly proposed for a scalable method to prepare MXene Ti 3 C 2 T x /gelatin/sodium lignosulphonate (MXene/GEL/SL) films with good biodegradability, and Fe 3+ ions were introduced to enhance cross-linking degree and stabilize the gelatin matrixes, which endowed the films with mechanical flexibility and durability. The film (MXene content: 30 wt%) has a thickness of merely 0.08 mm, exhibiting a high SE/d value of 432 dB/mm and maintaining its good EMI shielding performance even after being soaked in water for 15 days. Additionally, the film-based triboelectric nanogenerator (TENG) even in 85 % humidity manifest excellent open-circuit voltage (230 V), short-circuit current (28 μA) and power density (2.9 W/m 2 ), respectively. Also, the TENG demonstrates good utility as a self-powered sensor when attached to different parts of human body to monitor human health. Therefore, the as-developed MXene/GEL/SL film presents good application prospects in the fields of both electromagnetic shielding and self-powered sensing for wearable electronics.
研究领域:
材料科学
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电子工程
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 32
·2102184
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IF 18.808
Wenbin Kang,Li Zeng,Shangwen Ling,Chunzheng Lv,Jingfeng Liu,Ruoxin Yuan,Chuhong Zhang
Known for its capability to architect tailored structures for the scaling of active materials in energy storage devices that cater for future electronics having stringent requirements on areal performance, 3D printing is receiving serious attention. However, lingering challenges originating from the notorious interfacial issue and weak component interaction restrain current devices from making a breakthrough in deliverable capacity and structural flexibility. In this work, the printed electrode delivers a record-breaking electrical double layer (EDL) areal capacitance of 27.1 F cm −2 under an extremely large loading density of 134 mg cm −2 . This translates to a deliverable record-high EDL energy density of 1.26 mWh cm −2 for device performance, which even rivals the highest value reported from highly loaded pseudocapacitors. The bespoke devices are enabled by a strategically formulated 3D printable ink that initiates efficient autonomous room-temperature self-healing and strong interplay between constituting ink components. These contribute to interlayer coalescing for eliminated interlayer resistance for a solid electrochemical performance and printed electrodes of great mechanical compliance. By tapping into the huge potential of 3D printing, this work lays a solid foundation on which flexible devices with customized geometry, functionality, and outstanding performance for a broad range of applications can be readily realized.
研究领域:
材料科学
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能源存储
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Bohao Mei,Pengfei Jiao,Yao Xie,Yili Zhao,Yingzhan Li,Hongchen Liu
Conductive nanocellulose aerogels possess durability and sensitivity by using as piezoresistive sensors. Those aerogels are mostly prepared via a “bottom-up” strategy by using nanocellulose or dissolved and regenerated cellulose as raw materials. However, there is a pressing need to further enhance their sustainability and economic viability. To alleviate these issues, cellulose aerogel can alternatively be made via a “top-down” technique that entails the direct removal of contaminants from naturally porous biomass. Herein, conductive aerogels with exceptional mechanical flexibility and ultrahigh specific surface area were created. Delignified wood was partially dissolved and regenerated to created nanocellulose fibrils with spider web structure inside the pores of wood. After modification with silane coupling agent and carbon nanotubes (CNTs), flexible conductive wood aerogel (C-WA) were obtained. The specific surface area of C-WA was as high as 333.82 m 2 /g, which was 45 times of that of wood. C-WA could maintain its good resilience even after 1000 cycles, showing high compression resilience and excellent fatigue resistance (stress retention rate was 87.22%, height retention rate was 99.5%). The utilization of C-WA as a pressure sensor demonstrated remarkable attributes, including ultra-fast response and stability within the designated range. Furthermore, it exhibited exceptional sensing performance even after enduring 2000 stable cycles. The system is capable of real-time, accurate, and efficient detection of human motion signals, showcasing immense potential for future applications in wearable electronic products.
研究领域:
材料科学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2024
·
IF 13
Dong Han,Peng Wang,Haitao Huang,Jiahua Deng,Jiankang Chen,Weijie Tang,Tingyi Wang,Binbin Li,Lili Zhang,Linfei Lai
Developing flexible energy storage devices with good deformation resistance under extreme operating conditions is highly desirable yet remains very challenging. Super-elastic MXene-enhanced polyvinyl alcohol/polyaniline (AMPH) hydrogel electrodes are designed and synthesized through vertical gradient ice templating-induced polymerization. This approach allows for the unidirectional growth of polyaniline (PANI) and 2D MXene layers along the elongated arrayed ice crystals in a controlled manner. The resulting 3D unidirectional AMPH hydrogel exhibits inherent stretchability and electronic conductivity, with the ability to completely recover its shape even under extreme conditions, such as 500% tensile strain, 50% compressive strain. The presence of MXene in the hydrogel electrode enhances its resilience to mechanical compression and stretching, resulting in less variation in resistance. AMPH has a specific capacitance of 130.68 and 88.02 mF cm −2 at a current density of 0.2 and 2 mA cm −2 , respectively, and retains 90% and 70% of its original capacitance at elongation of 100% and 200%, respectively. AMPH-based supercapacitors demonstrate exceptional performance in high salinity environments and wide temperature ranges (−30–80 °C). The high electrochemical activity, temperature tolerance, and mechanical robustness of AMPH-based supercapacitor endow it promising as the power supply for flexible and wearable electronic devices.
研究领域:
材料科学
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能源存储
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2024
·
IF 5.5
Jia-Qi Luo,Meng-Meng Lun,Qiang-Qiang Jia,Zhi-Jie Wang,Hai-Feng Lu,Yi Zhang,Da-Wei Fu
Comprehensive Summary Molecular ferroelastics with the natural features of mechanical flexibility and switchable spontaneous strain have attracted widespread attention in the scientific community due to their potential applications in tunable gratings, flexible memorizers, strain sensors, and intelligent actuators. However, most designs of molecular ferroelastics remain in the stage of blind exploration, posing a challenge to achieve a functional ferroelastic more effectively. Herein, we have successfully obtained a molecular ferroelastic, [Me 2 NH(CH 2 ) 2 NH 3 ](ReO 4 ) 2 (Me 2 NH(CH 2 ) 2 NH 3 = N , N -dimethylethylenediammonium), under the guidance of the mono-/double-protonation strategy. The double-protonated [Me 2 NH(CH 2 ) 2 NH 3 ](ReO 4 ) 2 undergoes a paraelastic-ferroelastic phase transition with the Aizu notation of 2/ m F at 322 K. Meanwhile, the theoretical calculation and experimental measurement simultaneously show that [Me 2 NH(CH 2 ) 2 NH 3 ](ReO 4 ) 2 possesses good mechanical flexibility, because its elastic modulus ( E ) of 8.26 GPa and hardness ( H ) of 0.45 GPa are smaller than the average values of organic crystals ( E of 12.05 GPa and H of 0.5 GPa), which makes it promising to apply in wearable pressure sensors, implantable medical sensors, high-precision tuners, etc . This work further enriches the molecular ferroelastic family and demonstrates that mono-/double-protonation is one of the effective molecular modification strategies for designing ferroelastics.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 9
·4907-4915
·
IF 3.119
Yi Hou,Nan Jiang,Dan Sun,Yiping Wang,Xianchun Chen,Songsong Zhu,Li Zhang
Hydrogels demonstrate superior properties that favor wound healing and have been widely used in clinical settings for wound dressing applications. However, commercial hydrogel dressings often lack flexibility/adhesiveness, and do not conform well to the irregular skin surfaces of complex wounds and/or wounds near joints. As a result, the wound is likely to be exposed to potential bacterial invasion. Herein, we designed and developed a mechanically flexible and self-adhesive polyurethane-poly(acrylamide) (PU-PAAm) hydrogel for wound healing applications. The hydrogel can be cured from a novel waterborne emulsion within 90 s under UV irradiation. The PU component within the PU-PAAm hydrogel plays a “bridging” role that accelerates the formation of an interpenetrating polymer network (IPN), which consists of a physically crosslinked PU network trapped within a chemically crosslinked PAAm network. The unique IPN structure endowes the hydrogel with superior stretchability and ductility. The hydrogen bonding formation and electrostatic interaction between the hydrogel and skin ensure strong adhesion without causing irritation to skin upon dressing removal. Animal studies further confirmed the PU-PAAm hydrogel's remarkable skin regeneration capability. This work shows our new hydrogel holds a promising prospect for treatment of complicated or challenging wounds such as burns and chronic wounds.
研究领域:
生物材料学
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医学工程
·
组织修复与再生
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2023
·Vol. 15
·期 2
·250
·
IF 5
Yafei Liu,Huixia Feng,Yujie Gui,Ting Chen,Haidong Xu,Xiaoxue Huang,Xuemei Ma
Conductive hydrogels with high electrical conductivity, ductility, and anti-dryness have promising applications in flexible wearable electronics. However, its potential applications in such a developing field are severely hampered by its extremely poor adaptability to cold or hot environmental conditions. In this research, an “organic solvent/water” composite conductive hydrogel is developed by introducing a binary organic solvent of EG/H2O into the system using a simple one-pot free radical polymerization method to create Ti3C2TXMXene nanosheet-reinforced polyvinyl alcohol/polyacrylamide covalently networked nanocomposite hydrogels (PAEM) with excellent flexibility and mechanical properties. The optimized PAEM contains 0.3 wt% MXene has excellent mechanical performance (tensile elongation of ~1033%) and an improved modulus of elasticity (0.14 MPa), a stable temperature tolerance from −50 to 40 °C, and a high gauge factor of 10.95 with a long storage period and response time of 110 ms. Additionally, it is worth noting that the elongation at break at −40 °C was maintained at around 50% of room temperature. This research will contribute to the development of flexible sensors for human-computer interaction, electronic skin, and human health monitoring.Keywords:MXene-based hydrogel;temperature tolerance;mechanical flexibility;anti-drying;strain sensors
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
ACS Applied Electronic Materials
·
2021
·
IF 3.314
Shijie Hou,Yukuan Shen,Yan Wang,Xuan Zhang,Wei Luo,Jia Huang
Ecofriendly and biofriendly materials are highly appealing in electronic devices with the booming development of the Internet of Things. Humidity sensors perform an indispensable role in various fields such as monitoring industry processes and living systems. In this contribution, for the first time, edible and abundant material-flour has been introduced to the sensing layers for humidity detection. The ionic conductive K2CO3 and hygroscopic glycerol (Gly) with biosafety were introduced to the sensing layer to promote a humidity sensing capability and long-time stability. The ingestible Gly-K2CO3 flour-based humidity sensor using PLA as substrates displays an excellent sensing performance and wide humidity detecting range. Good linearity between capacitance and relative humidity (RH) has been achieved for the RH range from 6% to 94%. According to a wireless monitoring system, even at 250 kHz, the sensor can still monitor the nuance of the humidity difference between 40% and 43% and exhibited an ultrafast response time (0.3 s) and recovery time (0.7 s). Furthermore, the consistent and stable sensing performance after long-time measurements for 100 days and bending tests for 500 cycles also demonstrated a long-time humidity detecting stability and mechanical flexibility for the Gly-K2CO3 flour-based humidity sensor. Humidity sensing mechanisms were thoroughly investigated through SEM-EDX, FTIR, XPS, and complex impedance spectroscopies. The enhanced sensing performance, wide humidity detecting range, and long-time stability are attributed to the ionic conductivity from K2CO3 and the hydrogen-bond interaction between H2O and enormous hydrophilic groups, such as hydroxyl and amino groups in the flour-based networks and binary solvent.
研究领域:
材料科学
·
电子工程
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）