分类： 物理学 >> 普通物理:统计和量子力学,量子信息等 提交时间： 2017-05-08
Huang, QJ [Huang, Qijin][ 1 ]
Shen, WF [Shen, Wenfeng][ 1 ]
Fang, XZ [Fang, Xingzhong][ 1 ]
Chen, GF [Chen, Guofei][ 1 ]
Guo, JC [Guo, Junchao][ 1 ]
Xu, W [Xu, Wei][ 1 ]
Tan, RQ [Tan, Ruiqin][ 2 ]
Song, WJ [Song, Weijie][ 1 ]
摘要： Highly flexible and transparent film heaters (TFHs) with superior mechanical and thermal stability were fabricated by embedding silver nanowires (AgNWs) into transparent polyimide (PI) films using a solution coating method. The fabricated AgNW/PI hybrid TFHs exhibited higher heating temperatures ($96 C) with lower input voltage ($6 V), shorter response time (T < 40 s), and lower power consumption (160.6 C cm2 W 1) than ITO/FTO heaters, as well as stability after repeated use. The AgNW/PI hybrid TFHs also showed excellent resistance to bending. After undergoing outer bending for a 1000 times, the change of sheet resistance was less than 18%. The effective embedment of the AgNW network in the surface of the transparent PI film not only decreased the surface roughness (Rrms < 1 nm) but also enhanced the resistance against oxidation and moisture. Potential applications of the AgNW/PI TFHs in window defogging and thermochromics are demonstrated.
分类： 物理学 >> 普通物理:统计和量子力学,量子信息等 提交时间： 2017-05-02
Huang, QJ [Huang, Qijin][ 1 ]
Shen, WF [Shen, Wenfeng][ 1 ]
Fang, XZ [Fang, Xingzhong][ 1 ]
Chen, GF [Chen, Guofei][ 1 ]
Yang, Y [Yang, Ye][ 1 ]
Huang, JH [Huang, Jinhua][ 1 ]
Tan, RQ [Tan, Ruiqin][ 2 ]
Song, WJ [Song, Weijie][ 1 ]
摘要： Flexible transparent conductive films (TCFs) are used in a variety of optoelectronic devices. However, their use is limited due to poor thermostability. We report hybrid TCFs incorporation in both aluminum-doped zinc oxide (AZO) and silver nanowires (AgNWs). The layered AZO/ AgNWs/AZO structure was deposited onto a transparent polyimide (PI) substrate and displayed excellent thermo- stability. When heated to 250 °C for 1 h, the change in resistivity (Rc) was less than 10% (Rc of pure AgNW film > 500) while retaining good photoelectric properties (Rsh = 8.6 Ohm/sq and T = 74.4%). Layering the AgNW network between AZO films decreased the surface roughness (Rrms < 8 nm) and enhances the mechanical flexibility of the hybrid films. The combination of these characteristics makes the hybrid film an excellent candidate for substrates of novel flexible optoelectronic devices which require high-temperature processing.
分类： 物理学 >> 普通物理:统计和量子力学,量子信息等 提交时间： 2017-05-02
Huang, QJ [Huang, Qijin][ 1 ]
Shen, WF [Shen, Wenfeng][ 1 ]
Xu, QS [Xu, Qingsong][ 1 ]
Tan, RQ [Tan, Ruiqin][ 2 ]
Song, WJ [Song, Weijie][ 1 ]
摘要： Silver nanoparticles with a mean diameter of approximately 30 nm were synthesized by reduction of silver nitrate with triethanolamine in the presence of polyacrylic acid. Silver nanoparticle-based ink was prepared by dispersing silver nanoparticles into a mixture of water and ethylene glycol. The mechanism for the dispersion and aggregation of silver nanoparticles in ink is discussed. The strong electrostatic repulsions of the carboxylate anions of the adsorbed polyacrylic acid molecules disturbed the aggrega- tion of metal particles in solutions with a high pH value (pH > 5). An inkjet printer was used to deposit this silver nanoparticle-based ink to form silver patterns on photo paper. The actual printing qualities of the silver tracks were then analyzed by variation of printing passes, sintering temperature and time. The results showed that sintering temperature and time are associated strongly with the conductivity of the inkjet-printed conductive patterns. The conductivity of printed patterns sintered at 150 C increased to 2.1 107 S m 1, which was approximately one third that of bulk silver. In addition, silver tracks on paper substrate also showed better electrical performance after folding. This study demonstrated that the resulting ink-jet printed patterns can be used as conductive tracks in flexible electronic devices.
分类： 物理学 >> 普通物理:统计和量子力学,量子信息等 提交时间： 2017-05-02
Xu, QS [Xu, Qingsong][ 1 ]
Shen, WF [Shen, Wenfeng][ 1 ]
Huang, QJ [Huang, Qijin][ 1 ]
Yang, Y [Yang, Ye][ 1 ]
Tan, RQ [Tan, Ruiqin][ 2 ]
Zhu, K [Zhu, Ke][ 1 ]
Dai, N [Dai, Ning][ 3 ]
Song, WJ [Song, Weijie][ 1 ]
摘要： Hybrid transparent conductive films (TCFs) with a sandwich structure composed of aluminum-doped zinc oxide (AZO) and Ag nanowires (AgNWs) were deposited on polyethylene terephthalate (PET) substrates. The AZO layers were prepared at room temperature by RF magnetron sputtering. The AgNWs were synthesized by a modified polyol method and inserted into the AZO layers. The optical properties and conductivity can be modified by the number of spin-coating cycles of an AgNWs suspension. Typically, an AZO/AgNW/AZO hybrid film exhibited an optical transmittance of 80.5%, a sheet resistance of 27.6 U sq 1 and an optical haze of 14.9%. The increase in optical haze caused by the silver nanowires may be beneficial for applications in solar cells. The hybrid films presented excellent flexible stability, showing only minor resistance changes and no surface cracks compared with pure AZO films. The AZO layers acted as the protecting layers that enhanced the adhesive and thermal stability of the hybrid films. The resulting hybrid TCFs with an AZO/ AgNW/AZO sandwich structure show potential applications in flexible electronics, energy storage and photovoltaic devices.
分类： 物理学 >> 普通物理:统计和量子力学,量子信息等 提交时间： 2017-05-02
Qi, LF [Qi, Liangfei][ 1,2 ]
Li, J [Li, Jia][ 1 ]
Zhu, CT [Zhu, Chaoting][ 1 ]
Yang, Y [Yang, Ye][ 1 ]
Zhao, SJ [Zhao, Shijin][ 2 ]
Song, WJ [Song, Weijie][ 1 ]
摘要： In this paper, flexible Ag electrodes with a hexagonal micromesh structure were fabricated on PET substrate using a photolithography technique. The effect of film thickness on optical and electrical properties of Ag electrodes was investigated systematically. Furthermore, these flexible transparent Ag mesh electrodes were firstly applied to a polymer dispersed liquid crystal (PDLC) device and its performance was evaluated. All of the Ag electrodes exhibited a high average transmittance of about 80.2–85.0% in the visible range (400–800 nm), and the minimum sheet resistance value reached 8.2 U sq 1. The prepared Ag mesh also showed an excellent performance of adhesion and bending, demonstrating its superior durability. The PDLC device based on Ag mesh electrodes showed comparable performance with that using ITO electrodes, indicating that the Ag mesh film can be a good substitution for ITO electrodes in PDLC devices and may find practical application in large area flexible devices.
分类： 物理学 >> 普通物理:统计和量子力学,量子信息等 提交时间： 2017-05-02
Shen, WF [Shen, Wenfeng][ 1 ]
Zhang, XP [Zhang, Xianpeng][ 1 ]
Huang, QJ [Huang, Qijin][ 1 ]
Xu, QS [Xu, Qingsong][ 1 ]
Song, WJ [Song, Weijie][ 1 ]
摘要： Silver nanoparticles (NPs) which could be kept in solid form and were easily stored without degeneration or oxidation at room temperature for a long period of time were synthesized by a simple and environmentally friendly wet chemistry method in an aqueous phase. Highly stable dispersions of aqueous silver NP inks, sintered at room temperature, for printing highly conductive tracks ($8.0 mU cm) were prepared simply by dispersing the synthesized silver NP powder in water. These inks are stable, fairly homogeneous and suitable for a wide range of patterning techniques. The inks were successfully printed on paper and polyethylene terephthalate (PET) substrates using a common color printer. Upon annealing at 180 C, the resistivity of the printed silver patterns decreased to 3.7 mU cm, which is close to twice that of bulk silver. Various factors affecting the resistivity of the printed silver patterns, such as annealing temperature and the number of printing cycles, were investigated. The resulting high conductivity of the printed silver patterns reached over 20% of the bulk silver value under ambient conditions, which enabled the fabrication of flexible electronic devices, as demonstrated by the inkjet printing of conductive circuits of LED devices.
分类： 物理学 >> 普通物理:统计和量子力学,量子信息等 提交时间： 2017-05-02
Zhang, XP [Zhang, Xianpeng][ 1 ]
Lan, PJ [Lan, Pinjun][ 1 ]
Lu, YH [Lu, Yuehui][ 1 ]
Li, J [Li, Jia][ 1 ]
Xu, H [Xu, Hua][ 2 ]
Zhang, J [Zhang, Jing][ 1 ]
Lee, Y [Lee, YoungPak][ 3,4 ]
Rhee, JY [Rhee, Joo Yull][ 5 ]
Choy, KL [Choy, Kwang-Leong][ 6 ]
Song, WJ [Song, Weijie][ 1 ]
摘要： In the preliminary design process of switched reluctance machine (SRM), adjusting the number of wingding turns or cross-sectional area of conductor to optimize windings design has dramatic effects on the performances like torque density, efficiency and thermal dissipation and so on. However, the difficulty exists on how to guarantee these performances while optimizing winding design. This paper proposes an analytical optimization design method based on an regulation model of ampere density and coil space factor, which can directly determine the optimal number of winding turns, the cross- sectional area of conductor, the ampere density and the coil space factor. And a MATLAB pre-design program has been developed to provide two design schemes respectively with and without the optimization model. The comparison analysis has been further carried out with finite element analysis (FEA). The simulation results verify that the performances can be highly improved with the proposed optimization model.
分类： 物理学 >> 普通物理:统计和量子力学,量子信息等 提交时间： 2017-05-02
Zhang, XP [Zhang, Xianpeng][ 1 ]
Lan, PJ [Lan, Pinjun][ 1 ]
Lu, YH [Lu, Yuehui][ 1 ]
Li, J [Li, Jia][ 1 ]
Xu, H [Xu, Hua][ 2 ]
Zhang, J [Zhang, Jing][ 1 ]
Lee, Y [Lee, YoungPak][ 3,4 ]
Rhee, JY [Rhee, Joo Yull][ 5 ]
Choy, KL [Choy, Kwang-Leong][ 6 ]
Song, WJ [Song, Weijie][ 1 ]
摘要： Antireflection (AR) coatings that exhibit multi- functional characteristics, including high transparency, robust resistance to moisture, high hardness, and antifogging proper- ties, were developed based on hollow silica−silica nano- composites. These novel nanocomposite coatings with a closed-pore structure, consisting of hollow silica nanospheres (HSNs) infiltrated with an acid-catalyzed silica sol (ACSS), were fabricated using a low-cost sol−gel dip-coating method. The refractive index of the nanocomposite coatings was tailored by controlling the amount of ACSS infiltrated into the HSNs during synthesis. Photovoltaic transmittance (TPV) values of 96.86− 97.34% were obtained over a broad range of wavelengths, from 300 to 1200 nm; these values were close to the theoretical limit for a lossy single-layered AR coating (97.72%). The nanocomposite coatings displayed a stable TPV, with degradation values of less than 4% and 0.1% after highly accelerated temperature and humidity stress tests, and abrasion tests, respectively. In addition, the nanocomposite coatings had a hardness of approximately 1.6 GPa, while the porous silica coatings with an open-pore structure showed more severe degradation and had a lower hardness. The void fraction and surface roughness of the nanocomposite coatings could be controlled, which gave rise to near-superhydrophilic and antifogging characteristics. The promising results obtained in this study suggest that the nanocomposite coatings have the potential to be of benefit for the design, fabrication, and development of multifunctional AR coatings with both omnidirectional broadband transmission and long-term durability that are required for demanding outdoor applications in energy harvesting and optical instrumentation in extreme climates or humid conditions.
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