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Self-assembling sulfonated graphene/polyaniline nanocomposite paper for high performance supercapacitor

Synthetic Metals 2015年 199卷 79-86页

作者： Tianju Fan Songzhao Tong Wenjin Zeng Qiaoli Niu Yidong Liu Chi-Yu Kao Jieyu Liu Wei Huang Yong Min Arthur J. Epstein Institute of Advanced Materials Nanjing University of Posts and Telecommunications Nanjing Jiangsu 210046 PR China State Key Laboratory of Organic Electronics and Information Displays and Fountain Global Photoelectric Technology Co. Ltd. Yancheng Jiangsu 224000 PR China Department of Physics and Chemistry & Biochemistry Ohio State University Columbus OH 43210 USA Textile Printing Chemistry & Environment Engineering Department Chengdu Textile College Chengdu Sichuan 611731 PR China

We reported a low cost and high efficient method to fabricate free-standing sulfonated graphene/polyaniline (SG/PANI) nanocomposite papers. The nanocomposite paper had layered structure, and polyaniline (PANI) was uniformly intercalated into the sulfonated graphene layers. The nanostructured PANI was coated on the surface of individual SG sheets. It was found that the sulfonated graphene actually acted as dopants to dope with the PANI. The SG/PANI nanocomposite papers had thin, lightweight, and flexible characters and its supercapacitor devices displayed excellent electrochemical performance in terms of ratio capacitance and good cycling stability. Its ratio capacitance reached 478 F/g at a discharge rate of 0.5 A/g and its capacitance retention rate maintained 88% of its original capacitance after 2000 cycles.

关键词： Sulfonated graphene (SG) Polyaniline (PANI) Graphene/PANI Sulfonated graphene/PANI (SG/PANI) Supercapacitors

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A Self‐Healing Aqueous Lithium‐Ion Battery

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Angewandte Chemie 2016年第46期128卷

作者： Yang Zhao Ye Zhang Hao Sun Xiaoli Dong Jingyu Cao Lie Wang Yifan Xu Jing Ren Yunil Hwang In Hyuk Son Xianliang Huang Yonggang Wang Huisheng Peng State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science and Laboratory of Advanced Materials Fudan University Shanghai 200438 China Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Institute of New Energy iChEM (Collaborative Innovation Center of Chemistry for Energy Materials) Fudan University Shanghai 200438 China Energy Materials Lab Materials Research Center Samsung Advanced Institute of Technology Samsung Electronics Co. LTD. 130 Samsung-ro Suwon-si Gyeonggi-do 443803 South Korea Samsung R&D Institute China Beijing 100028 China

Flexible lithium‐ion batteries are critical for the next‐generation electronics. However, during the practical application, they may break under deformations such as twisting and cutting, causing their failure to work or even serious safety problems. A new family of all‐solid‐state and flexible aqueous lithium ion batteries that can self‐heal after breaking has been created by designing aligned carbon nanotube sheets loaded with LiMn 2 O 4 and LiTi 2 (PO 4 ) 3 nanoparticles on a self‐healing polymer substrate as electrodes, and a new kind of lithium sulfate/sodium carboxymethylcellulose serves as both gel electrolyte and separator. The specific capacity, rate capability, and cycling performance can be well maintained after repeated cutting and self‐healing. These self‐healing batteries are demonstrated to be promising for wearable devices.

关键词： Flexible Elektronik Kohlenstoffnanoröhren Lithiumionenbatterien Nanotechnologie Selbstheilende Polymere

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Strain Sensors: Large‐Area Ultrathin Graphene Films by Single‐Step Marangoni Self‐Assembly for Highly Sensitive Strain Sensing Application (Adv. Funct. Mater. 9/2016)

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advanced Functional materials 2016年第9期26卷

作者： Xinming Li Tingting Yang Yao Yang Jia Zhu Li Li Fakhr E. Alam Xiao Li Kunlin Wang Huanyu Cheng Cheng‐Te Lin Ying Fang Hongwei Zhu National Center for Nanoscience and Technology Zhongguancun Beijing 100190 P. R. China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 P. R. China Center for Nano and Micro Mechanics Tsinghua University Beijing 100084 P. R. China Department of Engineering Science and Mechanics Materials Research Institute The Pennsylvania State University University Park PA 16802 USA Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective Technologies Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 P. R. China CAS Center for Excellence in Brain Science and Intelligence Technology Shanghai 200031 P.R. China

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Absorption-Ablation-Excitation Mechanism of Laser-Cluster Interactions in a Nanoaerosol System

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Physical Review Letters 2015年第9期114卷 093401-093401页

作者： Yihua Ren Shuiqing Li Yiyang Zhang Stephen D. Tse Marshall B. Long Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Thermal Engineering Tsinghua University Beijing 100084 China Collaborative Innovation Center of Advanced Nuclear Energy Technology Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China Department of Mechanical and Aerospace Engineering Rutgers The State University of New Jersey Piscataway New Jersey 08854 USA Department of Mechanical Engineering & Materials Science Yale University New Haven Connecticut 06520 USA

The absorption-ablation-excitation mechanism in laser-cluster interactions is investigated by measuring Rayleigh scattering of aerosol clusters along with atomic emission from phase-selective laser-induced breakdown spectroscopy. For 532 nm excitation, as the laser intensity increases beyond 0.16 GW/cm2, the scattering cross section of TiO2 clusters begins to decrease, concurrent with the onset of atomic emission of Ti, indicating a scattering-to-ablation transition and the formation of nanoplasmas. With 1064 nm laser excitation, the atomic emissions are more than one order of magnitude weaker than that at 532 nm, indicating that the thermal effect is not the main mechanism. To better clarify the process, time-resolved measurements of scattering signals are examined for different excitation laser intensities. For increasing laser intensity, the cross section of clusters decreases during a single pulse, evincing the shorter ablation delay time and larger ratios of ablation clusters. Assessment of the electron energy distribution during the ablation process is conducted by nondimensionalizing the Fokker-Planck equation, with analogous Strouhal SlE, Peclet PeE, and Damköhler DaE numbers defined to characterize the laser-induced aerothermochemical environment. For conditions where SlE≫1, PeE≫1, and DaE≪1, the electrons are excited to the conduction band by two-photon absorption, then relax to the bottom of the conduction band by electron energy loss to the lattice, and finally serve as the energy transfer media between laser field and lattice. The relationship between delay time and excitation intensity is well correlated by this simplified model with quasisteady assumption.

关键词： EXCITATION spectrum RAYLEIGH scattering ABSORPTION AEROSOLS (Sprays) ATOMIC emission spectroscopy

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Effect of formamide on the mechanical properties of thermoplastic protein films

Effect of formamide on the mechanical properties of thermopl...

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作者： Cheng, Yuan Jia Liu, Xin Li, Wen Bin Sun, Jun Cheng Sui, Kun Yan State Key Laboratory of New Textile Materials and Advanced Technology Wuhan Textile University Wuhan 430073 China Chemical Engineering and Environmental Sciences Qingdao University Qingdao 266071 China Shandong Tongda Group Weifang 261300 China

ISBN: (纸本)9783038351214

To manufacture the biodegradable protein films available for potential environmentally friendly application, down feather fiber was prepared and modified by formamide which acts as a plasticizer and then hot-pressed into films. The influence of formamdie on the mechanical properties of thermoplastic down films was investigated. The protein films modified by formamide were tough and showed excellent mechanical properties compared to the films without formamide. The down thermoplastic films modified by formamide showed lower weight loss of formamide indicating formamide is a good plasticizer for protein application. © (2014) Trans Tech Publications, Switzerland.

关键词： Plasticizers

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Structural and mechanical properties of poly(Ε-caprolactone) biocomposites reinforced with different silk-fibroin fabric structures

Structural and mechanical properties of poly(Ε-caprolactone...

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2014 Spring International Conference on Material Sciences and technology, MST-S 2014

作者： Wu, Yong Min Liu, Xin Sun, Jun Cheng Wang, Le Zhi Yao, Zhong Shan Dong, Jian Jian Sui, Kun Yan State Key Laboratory of New Textile Materials and Advanced Technology Wuhan Textile University Wuhan 430073 China Chemical Engineering and Environmental Sciences Qingdao University Qingdao 266071 China Shandong Tongda Group Weifang 261300 China

ISBN: (纸本)9783038350576

To develop novel biocomposites, three different silk-fibroin fabrics (plain woven fabric, plain weft-knit fabric and non-woven fabric) were, respectively, blended with poly(Ε-caprolactone) (PCL) by a solution blending method. The effects of various fabric structures on the mechanical and microstructure properties of silk-fibroin fabric reinforced (SF-fabric-reinforced) PCL biocomposites were investigated. It was obvious that the breaking strength and elongation of SF-fabric-reinforced PCL biocomposites decreased while the Young's modulus increased. Scanning Electron Microscopy (SEM) photographs showed that silk-fibroin fabrics were well bonded with PCL matrix. From Wide-Angle X-ray Diffraction (WXRD) analysis, plain woven and plain weft-knit fabrics showed higher ability to increase the crystallinity of PCL matrix compared with non-woven fabric. © (2014) Trans Tech Publications, Switzerland.

关键词： Scanning electron microscopy

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Self-powered ultraviolet photodetectors based on selectively grown ZnO nanowire arrays with thermal tuning performance

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Physical Chemistry Chemical Physics 2014年第20期16卷 9525-9529页

作者： Bai, Zhiming Chen, Xiang Yan, Xiaoqin Zheng, Xin Kang, Zhuo Zhang, Yue State Key Laboratory for Advanced Metals and Materials School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Key Laboratory of New Energy Materials and Technologies University of Science and Technology Beijing Beijing 100083 China

A self-powered Schottky-type ultraviolet photodetector with Al-Pt interdigitated electrodes has been fabricated based on selectively grown ZnO nanowire arrays. At zero bias, the fabricated photodetector exhibited high sensitivity and excellent selectivity to UV light illumination with a fast response time of 81 ms. By tuning the Schottky barrier height through the thermally induced variation of the interface chemisorbed oxygen, an ultrahigh sensitivity of 3.1 × 10⁴ was achieved at 340 K without an external power source, which was 82% higher than that obtained at room temperature. According to the thermionic emission-diffusion theory and the solar cell theory, the changes in the photocurrent of the photodetector at zero bias with various system temperatures were calculated, which agreed well with the experimental data. This work demonstrates a promising approach to modulating the performance of a self-powered photodetector by heating and provides theoretical support for studying the thermal effect on the future photoelectric device. © the Partner Organisations 2014.

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Low-voltage blue light emission from n-ZnO/p-GaN heterojunction formed by RF magnetron sputtering method

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Current Applied Physics 2014年第3期14卷 345-348页

作者： Shen, Yanwei Chen, Xiang Yan, Xiaoqin Yi, Fang Bai, Zhiming Zheng, Xin Lin, Pei Zhang, Yue State Key Laboratory for Advanced Metals and Materials School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Key Laboratory of New Energy Materials and Technologies University of Science and Technology Beijing Beijing 100083 China

High quality n-ZnO/p-GaN heterojunction was fabricated by growing highly crystalline ZnO epitaxial films on commercial p-type GaN substrates via radio frequency (RF) magnetron sputtering. Low-voltage blue light emitting diode with a turn-on voltage of ∼2.5 V from the n-ZnO/p-GaN heterojunction was demonstrated. The diode gives a bright blue light emission located at ∼460 nm and a low threshold voltage of 2.7 V for emission. Based on the results of the photoluminescence (PL) and electroluminescence (EL) spectra, the origins of the EL emissions were studied in the light of energy band diagrams of ZnO-GaN heterojunction, and may attribute to the radiative recombination of the holes in p-GaN and the electrons injected from n-ZnO, which almost happened on the side of p-GaN layer. These results may have important implications for developing short wavelength optoelectronic devices. © 2013 Elsevier B.V. All rights reserved.

关键词： Electroluminescence RF magnetron sputtering ZnO film ZnO/GaN heterojunction

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Study on the Dyeability of Flax in Ethanol-water System

Study on the Dyeability of Flax in Ethanol-water System

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The 89th textile Institute World Conference(第89届世界纺织大会)

作者： Liangjun Xia Chunhua Zhang Xingfang Xiao Shan Cheng Junbin Zhou Weilin Xu College of Textile Science and Engineering Wuhan Textile University State Key Laboratory of New Textile Materials and Advanced Processing TechnologiesWuhan Textile University

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Preparation and Characterization of Silk Fibroin Powder/Polysulfone Ultrafiltration Membrane

Preparation and Characterization of Silk Fibroin Powder/Poly...

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The 89th textile Institute World Conference(第89届世界纺织大会)

作者： Canhong Xu Shaojin Gu Jingjing Huang Jiehao Du Huan Xia Weilin Xu State Key Laboratory Breeding Base of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhanChina State Key Laboratory Breeding Base of New Textile Materials and Advanced Processing TechnologiesWuhan Textile UniversityWuhanChina School of Textile Science and Engineering Wuhan Textile UniversityWuhanChina

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