Journal of Materials Chemistry C
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2020
·Vol. 8
·期 40
·14155-14163
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IF 7.059
Haibo Ye,Bo Sun,Ziyi Wang,Zhiyong Liu,Xuning Zhang,Xianhua Tan,Tielin Shi,Zirong Tang,Guanglan Liao
Organic–inorganic halide perovskite materials exhibit excellent memristive properties, such as high ON/OFF ratio and low switching voltage. However, the toxicity of lead and poor stability strictly limit their further commercial applications. Herein, a high-quality nontoxic and stable AgBiI4 perovskite film is successfully synthesized via a low-temperature dynamic hot casting method, and resistive switching (RS) memory devices based on AgBiI4 are reported for the first time. The RS memory devices with the ITO substrate exhibit typical bipolar nonvolatile memory behaviors with an ultralow operating voltage (≈0.16 V), high ON/OFF ratio (≈104), reversible RS by pulse voltage operation (>700) and long data retention (>104 s), superior to those of most of the other perovskite-based memory devices. Furthermore, a high performance flexible nonvolatile resistive switching (RS) memory device based on a AgBiI4 perovskite with a PEN substrate is fabricated. The flexible device also displays good stability under repeated bending tests (>1000 cycles). By analyzing the current–voltage responses, and the transmission electron microscopy, energy dispersive spectroscopy and X-ray photoelectron spectroscopy results, we propose a mechanism involving conducting filaments formed by Ag cations to describe the RS behavior of the Ag/PMMA/AgBiI4/ITO device. Our work demonstrates that AgBiI4 is promising for nonvolatile memory devices and paves the way for realizing low-power consumption flexible nonvolatile memory devices.
研究领域:
材料科学
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电子工程
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纳米技术
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DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 19
·9797-9805
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IF 11.301
Junhui Tang,Ruisi Chen,Lidong Chen,Guillermo C. Bazan,Ziqi Liang
n-Type semiconducting polymers bearing high Seebeck coefficients (S) have been seldom employed in organic–inorganic thermoelectric nanocomposites (TENCs). Herein we illustrate how to exploit an n-type semiconducting polymer to fabricate TENCs comprising N2200 and metallic Co NWs, in which N2200 contributes significantly to the S of the TENCs. The TENCs exhibit a highest power factor (PF) of 288 μW m−1 K−2 at 80 wt% Co NWs. At a greater Co NW content, the organic/inorganic inter-connectivity deteriorates, owing to the rigid molecular chains of N2200, retarding the increase of electrical conductivity (σ) and also undermining the mechanical flexibility. Flexible n-type doped SWCNTs were therefore added to introduce additional conductive paths. At an optimal amount of SWCNTs (2 wt%), the σ increases to 1860 S cm−1, whereas S remains at approximately −45 μV K−1 and the bendability is improved. The maximal PF and zT values of the resulting ternary TENC reach 483 μW m−1 K−2 and 0.18 at 380 K, respectively. By pairing with p-type PEDOT:PSS/SWCNT thin films, the 6-legged flexible TEG yields maximum output voltage and power of 9.80 mV and 3.72 μW, respectively, when ΔT = 50 K. This work manifests a new avenue to both highly efficient and bendable thermoelectric materials through the judicious choice of multiple blend components.
研究领域:
材料科学
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能源技术
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高分子化学
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DOI
高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 8
·1096
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IF 4.034
Liyuan Zhao,Renyan Zhang,Chuyun Deng,Yuanxi Peng,Tian Jiang
Controllably tuned infrared emissivity has attracted great interest for potential application in adaptive thermal camouflage. In this work, we report a flexible multilayer graphene based infrared device on a porous polyethylene membrane, where the infrared emissivity could be tuned by ionic liquid intercalation. The Fermi level of surface multilayer graphene shifts to a high energy level through ionic liquid intercalation, which blocks electronic transition below the Fermi level. Thus, the optical absorptivity/emissivity of graphene could be controlled by intercalation. Experimentally, the infrared emissivity of surface graphene was found to be tuned from 0.57 to 0.41 after ionic liquid intercalation. Meanwhile, the relative reflectivity Rv/R0of surface graphene increased from 1.0 to 1.15. The strong fluorescence background of Raman spectra, the upshift of the G peak (~23 cm−1), and the decrease of sheet resistance confirmed the successful intercalation of ionic liquid into the graphene layers. This intercalation control of the infrared emissivity of graphene in this work displays a new way of building an effective thermal camouflage system.Keywords:graphene;ionic liquid;intercalation;flexible;infrared emissivity
研究领域:
材料科学
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光学工程
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产品关联
DOI
PubMed
高影响因子
LANGMUIR
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2019
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IF 3.683
Muhammad Murtaza,Naveed Hussain,Junchen Liu,Hui Wu
Metallic dendrites with uniform morphology, high purity, and large yield remain challenging to synthesize. In this work, single-crystalline silver (Ag) dendrites with uniform morphology, high purity, and large yield are successfully synthesized by employing single replacement reaction between aqueous silver nitrate (AgNO3) and solid copper (Cu) by jet. The combined effect of diffusion-limited aggregation and the locally oriented attachment of Ag particles is responsible for the formation of silver dendrites under nonequilibrium conditions. Finally, the potential applications of as-synthesized silver dendrites are demonstrated by successfully preparing silver-based conductive ink for flexible electronics and wearable equipment. The conductive pattern exhibits resistivity of 7.2 μΩ·cm, showing good conductivity of the prepared conductive material. This facile and time-efficient synthetic route can be extended to synthesize other noble metal nanostructures with desired morphologies by adopting selective precursor salt concentrations and substrate metals with proper redox potentials.
研究领域:
材料科学
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化学合成
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DOI
PubMed
高影响因子
Nanomaterials
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2019
·Vol. 9
·期 3
·363
·
IF 4.034
Xinzhi Wang,Jianguo Tang,Guanghui Wang,Wei Wang,Junjie Ren,Wei Ding,Xinbo Zhang,Yao Wang,Wenfei Shen,Linjun Huang,Laurence A. Belfiore
In this research contribution, nano-aggregates have been fabricated by introducing lanthanide (Ln3+) ions into solutions of amphiphilic diblock copolymers of polystyrene-b-poly (acrylic acid) (PS-b-PAA). The coordination of acrylic acid segments to lanthanide cations induces diblock copolymer (BCPs) self-assembly in order to design stable white luminescent hybrid nanoparticles with fine uniform particle size. The introduction of Ln3+ions (Eu3+and Tb3+) bestows the micelles, precisely white light, upon excitation of 342 nm. Lanthanide coordination cross-linking of poly (acrylic acid) segments, or blocks, endows the micelles higher thermal stability than that of BCPs micelles without cross-linking. As the most important key point of this work, the regular and stable nano-particles with high emission quality can make fully flexible electroluminescent devices with self-formation or uncoordinated into polymer hosts. Instead of inorganic luminescent nanoparticles with hard cores, this method can potentially apply for fully flexible white-light emitting diodes (FFWLEDs).Keywords:nano-aggregates;diblock copolymer;fully flexible;white-light
研究领域:
材料科学
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光学
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DOI
PubMed
高影响因子
POLYMER
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2023
·
IF 4.6
Jinfeng Tian,Liwei Yan,Hao Zhang,Yuan Wang,Yuanbo Cai,Yisen Huang,Zhaohui Lu,Shuang Xia,Yang Chen,Zhengguang Heng,Huawei Zou,Mei Liang
To achieve uniform distribution of heteroatoms in silicone rubber, further simultaneously improving the flexibility and ablation resistance, polydimethylsiloxane with an interpenetrating zirconium-containing double-network (Zr-PDMS) was prepared. Compared to pure PDMS , the tensile strength and elongation-at-break of Zr-PDMS with interpenetrating double-network were increased by 615.33% and 124.23%, respectively, exhibiting significantly enhanced flexibility. Ablation analysis indicated that Zr-PDMS showed excellent anti-ablation performance, exhibiting obviously decreased mass ablation rate and charring rate. Most importantly, different from the crisp charred layers of pure PDMS as well as ZrO 2 blends, Zr-PDMS formed stable and coherent charred layers after ablation tests. The improvement correlated to the in-situ formation of tetragonal ZrO 2 in the char layer of Zr-PDMS, which could avoid the generation of defects in the ZrO 2 blends char layer were discussed in detail. This work provided a new strategy of high flexible silicon rubber with excellent ablative performance, which can be expected to be well applied in the hypersonic spacecrafts.
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
CERAMICS INTERNATIONAL
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2022
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IF 5.532
Pengpeng Xu,Junyi Yu,Chaofan Li,Suibin Luo,Shanming Ke,Yangbo Zhou,Shuhui Yu,Rong Sun
Flexible polymer composites with high dielectric constants and low dielectric losses at high frequencies are highly desired in microwave and RF applications. However, a high dielectric constant is often obtained at the expense of flexibility because a high loading of filler is needed. In this work, we synthesize a core-shell structured 1D filler by coating high-dielectric-constant PbTiO 3 onto the surface of low-thermal-expansion-coefficient SiC nanofibers , which are then incorporated into the epoxy matrix together with BaTiO 3 nanoparticles to form the multi-phase BaTiO 3 /SiC@PbTiO 3 /epoxy composite film . A high dielectric constant (35 at 100 Hz and 20 at 5 GHz) and a low dielectric loss (0.023 at 100 Hz and 0.13 at 5 GHz) are achieved as the filling content of SiC@PbTiO 3 and BaTiO 3 is 5.24 wt% and 80 wt%, respectively. Prediction models of the effective dielectric constant of polymer-based composites reveal that a continuous polarization network is constructed in the composites owing to the physical contact between BaTiO 3 and PbTiO 3 . The construction of the multi-phase filler provides a feasible way to effectively adjust and improve the dielectric properties of polymer-based composite films.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 22
·26359-26370
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IF 2.478
Wang Yuping,Dong Qing,Shi Shuying,Zhang Xiaoqian,Zhu Ze,Guo Zhenfeng,Chow Yuk Tak,Wang Xinqiang,Zhang Guanghui,Zhu Luyi,Xu Dong
Ba 0.7 Sr 0.29 La 0.01 TiO 3 (BSLT) fibers with good crystallinity were prepared by the electrospinning method, and the flexible BSLT/PVDF composite membranes were prepared by a simple papermaking process. The fiber exhibited good fiber morphology after being heat-treated to 900 °C. The composite membrane showed strong tensile strength and excellent dielectric properties. The tensile strength of the 20% PVDF composite membrane was 2.66 times that of pure BSLT membrane. Fiber membrane after compounding with PVDF maintained high dielectric constant ε r with a small dielectric loss tan δ . It has good frequency stability in the range of 100 Hz to 100 kHz. The dielectric constant of 20% PVDF composite fiber membrane could still reach 49.5 ( f = 1000 Hz). The dielectric constant and dielectric loss maintained good stability in the range of 40 to 160 °C. The dielectric constant and dielectric loss of the prepared fiber membrane possessed more stable temperature stability and frequency stability than those of barium titanate-based/organic polymer membranes prepared by other methods.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2022
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IF 10.383
Hong Cao,Yuan Li,Weidi Xu,Jie Yang,Zhengying Liu,Lu Bai,Wei Yang,Mingbo Yang
Phase change materials (PCMs) as one of the most potential latent heat storage techniques have been widely used for thermal management and energy storage. However, simultaneously imparting flexibility, high thermal conductivity, and considerable energy storage density to organic PCMs remains challenging. In this work, a coupling strategy combining substance exchange and magnetic orientation has been proposed to fabricate phase change gels (PCGs) with thermally induced flexibility and high through-plane thermal conductivity. In the PCGs, synthesized boron nitride/ferroferric oxide (BN@Fe3O4) particles and polyacrylic acid (PAA) precursor liquid are introduced to polyethylene glycol (PEG) aqueous solution, and a magnetic field is applied in the process of PAA network construction to promote ordered arrangement of BN@Fe3O4 along the direction of the magnetic field. Consequently, PEG is wrapped by the cross-linked PAA supporting network, forming PCGs with excellent shape stability and thermally induced flexibility. The vertical orientation structure of BN@Fe3O4 endows the PCGs with an enhanced through-plane thermal conductivity of up to 1.07 W m–1 K–1 at a BN@Fe3O4 loading of 25.6 wt % with an additional enhancement of 215% compared to the composite without BN. The thermally conductive leakage-proof PCGs present great application potential in heat storage and management.
研究领域:
材料科学
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能源工程
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产品关联
DOI
PubMed
高影响因子
OPTICAL ENGINEERING
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2023
·
IF 1.3
Jie Zheng,Xian Wu,Wenkai Zhang,Jiahao Cheng,Ke Liu,Guijie Liang,Xin Zhang,Jingyang Wang,Yating Zhang,Qingsong Hu
In recent years, lead-free metal halide luminescent materials have attracted extensive attention because of their excellent properties including but not limited to good environmental compatibility, ultrawide emission band, and high photoluminescence quantum yield. They are considered to have great application potential in the photoelectric field. We modified the previously reported synthesis and prepared pure phase Cs2SnCl6 : Bi3 + , Te4 + using simple solution method. Then the emitter was further coated with polysiloxane to form polysiloxane luminescent ceramic (PSOLC). The prepared PSOLCs have almost the same luminescence as the powders, and their color coordinates and color temperature can be tuned freely by adjusting the ratio of blue and yellow emission, which both encourage outdoor-lighting application. Additionally, they are demonstrated to support flexible luminescence and show highly improved machinability. To test their performance in practical application, we apply the PSOLCs to safety identification board and finally get a satisfactory result, directly indicating that the PSOLCs prepared from lead-free perovskite are quite suitable for flexible-lighting-related display applications.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
Advanced Composites and Hybrid Materials
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2023
·Vol. 6
·期 3
·1-9
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IF 20.1
Xu Ting,Wang Yaxuan,Liu Kun,Zhao Qingshuang,Liang Qidi,Zhang Meng,Si Chuanling
With the depletion of fossil resources and the gradual intensification of environmental pollution, green and sustainable electrochemical devices have aroused intensive attraction. The supercapacitor, demonstrating fast charging rate, high power densities, and long cycling life, has great application prospects in high power output and backup power supply. Herein, an ultralight and robust MXene/carbon nanotube aerogel is constructed by facile directional freezing and subsequent freeze-drying. Benefiting from the strongly π-π interactions between MXene nanosheets and carbon nanotube, the assembled MXene/carbon nanotube composite aerogel exhibits abundant pore structures, superior conductivity, and good mechanical properties. The electrical conductivity of MXene/carbon nanotube aerogel is up to 1600 S m −1 . The MXene/carbon nanotube aerogel can be subjected to 70% compressive strain and retain 85% initial strain over 1000 compress-release cycles. The as-prepared all-solid-state supercapacitor with MXene/carbon nanotube aerogel shows outstanding electrochemical performance (410.7 mF cm −2 at the current density of 0.8 mA cm −2 ). The supercapacitor is flexible and can be bent from 0 to 90° as the cyclic voltammetry curves are almost consistent. Furthermore, the LED can be lighted by four devices in series.
研究领域:
材料科学
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能源技术
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纳米科技
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2019
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IF 3.375
Qian Yan,Liwei Zhao,Qiancun Cheng,Tong Zhang,Bo Jiang,Yuanjun Song,Yudong Huang
In this paper, a thermally reversible self-healing polysiloxane elastomer based on Diels–Alder (DA) chemistry was successfully prepared via polysiloxane containing maleimide groups and furan rings. The hyperbranched polysiloxane (HPSis) containing furan rings and double bonds was synthesized and introduced to improve the mechanical strength of the polymer. The mechanical strength of polysiloxane without HPSis was only 0.20 MPa; however, it can be increased to 0.87 MPa with the introduction of HPSis. Since HPSis contain multi-furan rings required for thermally reversible reactions, the addition of HPSis would not have a negative effect on self-healing performance. The cracks on the surface of polysiloxane can be self-healed in a short time, and the self-healing efficiency of polysiloxane can achieve 85%. Moreover, flexible conductive composites poly(dimethylsiloxane)/carbon black (PDMS/CB) were fabricated by mixing the polysiloxane matrix with conductive filler carbon black (CB) and can be applied in wearable flexible sensors.
研究领域:
材料科学
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聚合物化学
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纳米技术
✓ 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）