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Fluorine Substitution Effect on the Material Properties in transparent Aromatic Polyimides

Chinese Journal of Polymer Science 2022年第7期40卷 781-788页

作者： Wei-Feng Peng Huan-Yu Lei Xin-Xin Zhang Lu-Hao Qiu Ming-Jun Huang South China Advanced Institute for Soft Matter Science and Technology School of Emergent Soft MatterSouth China University of TechnologyGuangzhou510640China Guangdong Provincial Key Laboratory of Functional and Intelligent Hybrid materials and devices South China University of TechnologyGuangzhou510640China

The recent development of flexible display technology raised additional requirements for optical and electric properties of polyimides,accelerating the structure and property tunning of transparent *** unique electronic effect and steric hindrance effect of fluorine substitutions make fluorine-containing polyimides occupy an important position in the transparent polyimide *** this work,a series of transparent aromatic polyimides were prepared from a fixed 4,4’-(hexafluoroisopropylidene)diphthalic anhydride(6FDA)and biphenyl diamines with different substitute groups at the 2,2’,6,6’-*** systematically studied the effects of pendant groups on the thermal,mechanical,optical and dielectric properties of these 6FDA-based polyimides with the aid of density function theory(DFT)*** particular,we paid special attention to the simple but compact fluoro group *** simple fluoro substitution brought the advantages of maintaining the linearity of the backbone and dense polymer chain packing,which would minimize the weakening of polyimides’inherent thermal,dimensional and mechanical *** with trifluoromethyl substituted polyimides with the best optical transparency,polyimides containing fluoro substitutes exhibited slightly decreased optical transparency,but increased thermal and dimensional stability and higher mechanical *** results could shed light on the ultimate transparent polyimide film development toward the application in extreme working condition,e.g.,the colorless polyimide substrate film for the flexible display technology.

关键词： Polyimides Fluorine substitution transparent Dielectric Colorless

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Effect of manganese doping on the thermoelectric properties of Zintl phase EuCd_2Sb_2

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Journal of Rare Earths 2015年第10期33卷 1093-1097页

作者：闵武茂郭凯王继伟赵景泰 Key Laboratory of transparent Opto-Functional Inorganic materials of Chinese Academy of Sciences Shanghai Institute of Ceramics Chinese Academy of Sciences University of Chinese Academy of Sciences School of materials Science and Engineering Shanghai University Shanghai Advanced Research Institute Chinese Academy of Sciences

Polycrystalline samples of Zintl phase EuCd2-xMnxSb2 （0.05≤x≤0.6） with the CaAl2Si2-type crystal structure （space group P3ml） were synthesized via a solid-state reaction followed by suitable cooling, annealing and spark plasma sintering （SPS） processes. In samples with x=0.0, 0.1, 0.2, 0.4 and 0.6, the electrical conductivity, Seebeck coefficient, and thermal conductivity were performed as a function of temperature from 300 to 650 K. It was found that chemical substitution of Mn failed to optimize the thermoelectric properties of p-type conductive EuCd2Sb2. It was because that the Mn substitution induced the minority carriers （electrons）, resulting in decreasing the electrical conductivity drastically despite the fact that it enlarged the Seebeck coefficient and reduced the thermal conductivity synchronously.

关键词： Zintl phase compounds chemical substitution solid-state reaction thermoelectric properties rare earths

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Conduction Properties and Scattering Mechanisms in F-doped Textured transparent Conducting SnO_2 Films Deposited by APCVD

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Journal of materials Science & Technology 1997年第1期13卷 50-56页

作者： Deheng ZHANG(Dept. of Physics, Shandong University, Jinan 250100, China)Honglei MA(Institute of Optoelectronic materials and devices, Shandong University, Jinan 250100, China) Dept. of Physics Shandong University Jinan 250100 China Institute of Optoelectronic materials and devices Shandong University Jinan 250100 China

transparent conducting F-doped texture SnO2 films with resistivity as low as 5× 10-4 Ω ·cm,with carrier concentrations between 3.5 × 1020 and 7× 1020 cm-3 and Hall mobilities from 15.7 to 20.1 cm2/(V/s) have been prepared by atmosphere pressure chemical vapour deposition (APCVD). These polycrystalline films possess a variable preferred orientation, the polycrystallite sizes and orientations vary with substrate temperature. The substrate temperature and fluorine flow rate dependence of conductivity, Hall mobility and carrier conentration fOr the resultingfilms have been obtained. The temperature dependence of the mobiity and carrier concentrationhave been measured over a temperature range 16～400 K. A systematically theoretical analysis on scattering mechanisms for the highly conductive SnO2 films has been given. Both theoretical analysis and experimental results indicate that for these degenerate, polycrystalline SnO2 ：F films in the low temperature range (below 100 K), ionized impurity scattering is main scattering mechanism. However, when the temperature is higher than 100 K, the lattice vibration scattering becomes dominant. The grain boundary scattering makes a small contribution to limit the mobility of the films.

关键词： SnO cm Conduction Properties and Scattering Mechanisms in F-doped Textured transparent Conducting SnO2 Films Deposited by APCVD

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半导体薄膜表面粘附的非对称性偏压调控

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Acta Mechanica Sinica 2023年第3期39卷 1-6页

作者：李保文轩啸宇殷艳周建新张助华易敏郭万林 Key Laboratory for Intelligent Nano materials and devices of the Ministry of Education and Institute of NanoscienceState Key Laboratory of Mechanics and Control of Mechanical StructuresNanjing University of Aeronautics and AstronauticsNanjing210016China

电调控表面粘附对微机电系统是至关重要的,同时相对于外加电压极性常具有对称性.本文以二硫化钼为研究对象,以石墨烯、氮化硼和n型硅为参照组展示半导体薄膜表面的非对称粘附行为.研究主要通过导电原子力显微镜和理论模拟来揭示金探针... 详细信息

电调控表面粘附对微机电系统是至关重要的,同时相对于外加电压极性常具有对称性.本文以二硫化钼为研究对象,以石墨烯、氮化硼和n型硅为参照组展示半导体薄膜表面的非对称粘附行为.研究主要通过导电原子力显微镜和理论模拟来揭示金探针与金基底上二硫化钼之间的偏压调控粘附力的行为.结果反映二硫化钼表面偏压对粘附的调控能力远大于参照组材料,这种非对称行为主要来源于半导体薄膜与背电极之间形成的肖特基结中的内建电场.

关键词： Surface adhesion Molybdenum disulfide conductive atomic force microscope Schottky junction

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Flexible and breathable 3D porous SSE/MXene foam towards impact/electromagnetic interference/bacteria multiple protection performance for intelligent wearable devices

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Nano Research 2023年第7期16卷 10164-10174页

作者： Min Sang Shuai Liu Jianpeng Wu Xinyi Wang Junshuo Zhang Yunqi Xu Yu Wang Jun Li Ji Li Shouhu Xuan Xinglong Gong CAS Key Laboratory of Mechanical Behavior and Design of materials Department of Modern MechanicsUniversity of Science and Technology of ChinaHefei 230027China State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei 230026China Anhui Weiwei Rubber Parts group Co. Ltd.Tongcheng 231460China

As intelligent wearable devices,they will inevitably be subjected to various damages and disturbances from the external environment during daily ***,it is urgent to develop safeguarding materials with multiple protective ***,this work developed a flexible and breathable three-dimensional(3D)porous shear stiffening elastomer(SSE)/MXene(M-SSE)foam with impact/electromagnetic interference(EMI)/bacteria multiple protection performance for intelligent wearable *** continuous conductive MXene network in the 3D SSE porous structure made M-SSE foam exhibit excellent electromagnetic interference shielding property with a high shielding effectiveness of 34 *** to the shear stiffening effect of porous SSE matrix,M-SSE foam possessed unique anti-impact and protection *** energy dissipation rate reached up to more than 85%,illustrating M-SSE foam could effectively attenuate the external impact force and absorb the impact *** from the excellent photothermal performance of MXene,M-SSE foam achieved a considerable saturated temperature of 98℃ under 0.57 W/cm^(2) laser ***,M-SSE foam showed extraordinary antimicrobial property for Staphylococcus aureus according to the principle of photothermal ***,for the development of intelligent wearable devices,conductive MSSE foam could be used as an intelligent sensor to monitor various human movements owing to the highly sensitive *** work greatly expanded the application prospect of multifunctional protective materials in various complex environments and promoted the development of multifunctional smart wearable devices in protection field.

关键词： MXene three-dimensional(3D)porous foam electromagnetic interference shielding impact resistance antibacterial property intelligent wearable device

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Antibacterial conductive self-healing hydrogel wound dressing with dual dynamic bonds promotes infected wound healing

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Bioactive materials 2023年第12期30卷 129-141页

作者： Lipeng Qiao Yongping Liang Jueying Chen Ying Huang Saeed A.Alsareii Abdulrahman Manaa Alamri Farid A.Harraz Baolin Guo Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research College of StomatologyXi’an Jiaotong UniversityXi’an710049China Frontier Institute of Science and Technology State Key Laboratory for Mechanical Behavior of MaterialsXi’an Jiaotong UniversityXi’an710049China Department of Surgery College of MedicineNajran UniversityNajran11001Saudi Arabia Promising Centre for Sensors and Electronic devices(PCSED) Advanced Materials and Nano-Research CentreNajran UniversityNajran11001Saudi Arabia Department of Orthopaedics The First Affiliated Hospital of Xi’an Jiaotong UniversityXi’an710061China

In clinical applications,there is a lack of wound dressings that combine efficient resistance to drug-resistant bacteria with good self-healing *** this study,a series of adhesive self-healing conductive antibacterial hydrogel dressings based on oxidized sodium alginate-grafted dopamine/carboxymethyl chitosan/Fe3+(OSD/CMC/Fe hydrogel)/polydopamine-encapsulated poly(thiophene-3-acetic acid)(OSD/CMC/Fe/PA hydrogel)were prepared for the repair of infected *** Schiff base and Fe3+coordination bonds of the hydrogel structure are dynamic bonds that can be repaired automatically after the hydrogel network is ***,the hydrogel exhibits self-healing properties,allowing the hydrogel dressing to adapt to complex wound *** OSD/CMC/Fe/PA hydrogel showed good conductivity and photothermal antibacterial properties under near-infrared(NIR)light *** addition,the hydrogels exhibit tunable rheological properties,suitable mechanical properties,antioxidant properties,tissue adhesion properties and hemostatic ***,all hydrogel dressings improved wound healing in the infected full-thickness defect skin wound repair test in *** wound size repaired by OSD/CMC/Fe/PA3 hydrogel+NIR was much smaller(12%)than the control group treated with Tegaderm™film after 14 *** conclusion,the hydrogels have high antibacterial efficiency,suitable conductivity,great self-healing properties,good biocompatibility,hemostasis and antioxidant properties,making them promising candidates for wound healing dressings for the treatment of infected skin wounds.

关键词： Dynamic crosslinking Self-healing Infected wound Photothermal antibacterial Wound healing

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Electronic structures and optical properties of Ⅲ_A-doped wurtzite Mg_(0.25)Zn_(0.75)O

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Chinese Physics B 2014年第8期23卷 430-435页

作者：郑树文何苗李述体章勇 Laboratory of Nanophotonic Functional materials and devices Institute of Opto-electronic Materials and TechnologySouth China Normal University

The energy band structures, density of states, and optical properties of IliA-doped wurtzite Mg0.25Zn0.75O （IIIA= A1, Ga, In） are investigated by a first-principles method based on the density functional theory. The calculated results show that the optical bandgaps of Mg0.25Zn0.75O：IIIA are larger than those of Mg0.25Zn0.75O because of the Burstein-Moss effect and the bandgap renormalization effect. The electron effective mass values of Mg0.25Zn0.75O：IIIA are heavier than those of Mgo.25Zno.750, which is in agreement with the previous experimental result. The formation energies of MgZnO：Al and MgZnO：Ga are smaller than that of MgZnO：In, while their optical bandgaps are larger, so MgZnO：Al and MgZnO：Ga are suitable to be fabricated and used as transparent conductive oxide films in the ultra-violet （UV） and deep UV optoelectronic devices.

关键词： first-principles Mg0.25Zn0.75O electronic structure optical bandgap

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Solution-processed wafer-scale nanoassembly of conducting polymers enables selective ultratrace nerve agent detection at low power

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Nano Research 2023年第4期16卷 5653-5664页

作者： Bin Luo Jianan Weng Zhi Geng Qichao Pan Xilin Pei Yong He Chuanzhi Chen Hongxing Zhang Renbo Wei Yupeng Yuan Jin Yang Jinyi Ma Zhengwei You Bo Zhu School of materials Science and Engineering&Shanghai Engineering Research Center of Organ Repair Shanghai UniversityShanghai 200444China Innovation Center for Textile Science and Technology Donghua UniversityShanghai 201620China Institute of NBC Defense P.O.Box 1048Beijing 102205China School of Chemical Engineering Northwest UniversityXi’an 710069China th Institute of China Electronics Technology group Chongqing 400060China State Key Laboratory for Modification of Chemical Fibers and Polymer materials College of Material Science and EngineeringDonghua UniversityShanghai 201620China

There is a great interest in developing microelectronic devices based on nanostructured conducting polymers that can selectively electro-couple analytes at high sensitivity and low *** conducting polymers have emerged as promising candidates for this technology due to their excellent stability with low redox potential,high conductivity,and selectivity endowed by chemical ***,it remains challenging to develop cost-effective and large-scale assembly approaches for functionalized conducting polymers in the practical fabrication of electronic ***,we reported a straightforward waferscale assembly of nanostructured hexafluoroisopropanol functionalized poly(3,4-ethylenedioxythiophene)(PEDOT-HFIP)on smooth *** approach is template-free,solution-processed,and adaptable to conductive and nonconductive *** this approach,the nanostructured PEDOT-HFIPs could be easily integrated onto interdigitated electrodes with intimate ohmic *** the optimized space-to-volume ratio,we demonstrated a low-power,sensitive,and selective nerve agent sensing technology using this platform by detecting sarin vapor with a limit of detection(LOD)of 10 ppb and signal strength of 400 times the water interference at the same concentration,offering significant advantages over existing similar *** envision that its easy scale-up,micro size,small power consumption,and combination of high sensitivity and selectivity make it attractive for various wearable platforms.

关键词： conducting polymer PEDOT sensor nano nerve agent

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Recent advances in flexible and wearable organic optoelectronic devices

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Journal of Semiconductors 2018年第1期39卷 153-174页

作者： Hong Zhu Yang Shen Yanqing Li Jianxin Tang College of Nano Science and Technology Institute of Functional Nano & Soft Materials (FUNSOM) Jiangsu Key Laboratoryfor Carbon-Based Functional Materials & Devices Soochow University Institute of Organic Optoelectronics(IOO) JITRI

Flexible and wearable optoelectronic devices have been developing to a new stage due to their unique capacity for the possibility of a variety of wearable intelligent electronics, including bendable smartphones, foldable touch screens and antennas, paper-like displays, and curved and flexible solid-state lighting devices. Before extensive commercial applications, some issues still have to be solved for flexible and wearable optoelectronic devices. In this regard, this review concludes the newly emerging flexible substrate materials, transparent conductive electrodes, device architectures and light manipulation methods. Examples of these components applied for various kinds of devices are also summarized. Finally, perspectives about the bright future of flexible and wearable electronic devices are proposed.

关键词： flexible electronics optoelectronic devices wearable devices

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Multifunctional Integrated transparent Film for Efficient Electromagnetic Protection

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Nano-Micro Letters 2022年第5期14卷 1-14页

作者： Gehuan Wang Yue Zhao Feng Yang Yi Zhang Ming Zhou Guangbin Ji College of materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 210016People’s Republic of China

Silver nanowire(Ag NW)has been considered as the promising building block for the fabrication of transparent electromagnetic interference(EMI)shielding ***,the practical application of Ag NW-based EMI shielding films has been restricted due to the unsatisfactory stability of Ag ***,we proposed a reduced graphene oxide(rGO)decorated Ag NW film,which realizes a seamless integration of optical transparency,highly efficient EMI shielding,reliable durability and *** Ag NW constructs a highly transparent and conductive network,and the rGO provides additional conductive path,showing a superior EMI shielding effectiveness(SE)of 33.62 dB at transmittance of 81.9%.In addition,the top rGO layer enables the hybrid film with reliable durability and chemical stability,which can maintain 96%and 90%EMI SE after 1000 times bending cycles at radius of 2 mm and exposure in air for 80 ***,the rGO/Ag NW films also possess fast thermal response and heating stability,making them highly applicable in wearable *** synergy of Ag NW and rGO grants the hybrid EMI shielding film multiple desired functions and meanwhile overcomes the shortcomings of Ag *** work provides a reference for preparing multifunctional integrated transparent EMI shielding film.

关键词： Reduced graphene oxide Electromagnetic interference shielding Flexible transparent Silver nanowire

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