银纳米线网筛柔性导电薄膜的光电性能研究
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- 英文论文题名：The Optoelectrical Properties of Transparent, Flexible, Silver Nanowire Mesh films
- 论文作者：王小亮 ; 白丽云 ; 曲兆明 ; 王平平 ; 赵敏 ; 成伟 ; 王庆国
- 英文论文作者：Wang Xiaoliang ; Bai Liyun ; Qu Zhaoming ; Wang Pingping ; Zhao Min ; Cheng Wei ; Wang Qingguo ; Institute of Electrostatic & Electromagnetic Protection ; Mechanical Engineering College
- 年：2015
- 作者机构：军械工程学院静电与电磁防护研究所;
- 论文关键词：银纳米线 ; 柔性透明薄膜 ; 光电性能 ; 电磁屏蔽 ; 复合材料
- 英文论文关键词：Silver nanowires ; Flexible Transparent films ; Optoelectrical properties ; electromagnetic interference shielding effectiveness ; Composite materials
- 会议召开时间：2015-08-12
- 会议录名称：静电放电：从地面新技术应用到空间卫星安全防护—中国物理学会第二十届全国静电学术会议论文集
- 语种：中文
- 分类号：TB383.1;TB383.2
- 学会代码：WLJD
- 会议名称：静电放电 ; 从地面新技术应用到空间卫星安全防护—中国物理学会第二十届全国静电学术会议
- 会议地点：中国河北石家庄
- 主办单位：中国物理学会静电专业委员会
- 学会名称：中国物理学会静电专业委员会
- 页数：7
- 文件大小：816k
- 原文格式：D
- 会议级别：全国
摘要
研究银纳米线导电薄膜的光电性能。采用液相还原法,制备了由银纳米线网筛组成的导电薄膜。推导了导电薄膜的透光率T、表面电阻R_s的计算公式。发展了Mie光散射理论,导出透光率T是纳米线的直径D以及表面覆盖率φ_s的函数。采用渗透理论,得到了表面电阻R_s与纳米线直径D、长径比L/D以及表面覆盖率φ_s的关系;对于表面电阻R_s,其临界指数τ=1.23,与二维无规则网络模型计算值τ=1.3相符;计算表明直径分布D和长径比其透光率与导电性能具有同样重要的影响。最后,理论预测了银纳米线/聚合物复合材料折射率的实部和虚部,给出了Maxwell-Garnett模型及Van De Hulst模型。采用Mie理论,导出透光率T与纳米线的直径D以及表面覆盖率φ_s的关系。利用渗滤理论,结合表面覆盖率φ_s推到了R_s的半经验公式。理论预测φ_s与R_s以及T的关系与实验符合较好。纳米线直径D是影响透光率的最重要因素,而导电性能主要由D以及φ_c来决定。对于渗滤理论,实验临界指数与理论计算值相符。最后,理论预测了Ag纳米线/聚合物复合材料折射率的实部和虚部,给出了Maxwell-Garnett模型及Van De Hulst模型。
We have characterized the optoelectrical properties of networks of silver nanowires.We have developed a kind of high-yield synthesis strategy for silver nanowires by a polyol process.Mie light scattering theory of nanowires is developed to predict T as a function of diameter D and the surface fraction φ_s covered by the AgNWs.Percolation theory is used to derive an equation for Rs in terms of D,the aspect ratio of wires D/L and φ_s.The critical exponent t for percolation of R_s is found to be 1.23 in agreement with theoretical results for 2D random resistive networks(τ=1.23).These results show the importance of both the distributions of D and D/L of the AgNWs to predict the optoelectrical properties.At last,we present theoretical and experimental results of the real and imaginary refractive indices of nanocomposites using the Maxwell model the Van De Hulst mode.We have presented an analysis of the optoelectrical properties of silver nanowires Mesh films based on Mie light scattering and electrical percolation theory.The Mie theory was used to calculate the transmission diameter and the surface fraction φ_s.We used the φ_s as a key parameter to formulate the theoretical expressions for T.We also developed a semi empirical expression for the R_s based on percolation theory.We present theoretical and experimental results of the real and imaginary refractive indices of nanocomposites using the Maxwell model the Van De Hulst mode.
We have characterized the optoelectrical properties of networks of silver nanowires.We have developed a kind of high-yield synthesis strategy for silver nanowires by a polyol process.Mie light scattering theory of nanowires is developed to predict T as a function of diameter D and the surface fraction φ_s covered by the AgNWs.Percolation theory is used to derive an equation for Rs in terms of D,the aspect ratio of wires D/L and φ_s.The critical exponent t for percolation of R_s is found to be 1.23 in agreement with theoretical results for 2D random resistive networks(τ=1.23).These results show the importance of both the distributions of D and D/L of the AgNWs to predict the optoelectrical properties.At last,we present theoretical and experimental results of the real and imaginary refractive indices of nanocomposites using the Maxwell model the Van De Hulst mode.We have presented an analysis of the optoelectrical properties of silver nanowires Mesh films based on Mie light scattering and electrical percolation theory.The Mie theory was used to calculate the transmission diameter and the surface fraction φ_s.We used the φ_s as a key parameter to formulate the theoretical expressions for T.We also developed a semi empirical expression for the R_s based on percolation theory.We present theoretical and experimental results of the real and imaginary refractive indices of nanocomposites using the Maxwell model the Van De Hulst mode.
引文
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[2]L.B.Hu,D.S.Hecht,and G.Gruner,“Carbon nanotube thin films:Fabrication,properties,and applications,”Chem.Rev.2010.110(10),5790-5844.
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[4]Mingjun Hu,Jiefeng Gao,Yucheng Dong,Kai Li,Guangcun Shan,Shiliu Yang,and Robert KwokYiu Li.Flexible Transparent PES/Silver Nanowires/PET Sandwich-Structured Film for High-Efficiency Electromagnetic Interference Shielding.Langmuir 2012,28,7101-7106.
[5]Y.G.Sun,Y.D.Yin,B.T.Mayers,T.Herricks,and Y.N.Xia,Uniform silver nanowires synthesis by reducing Ag NO3 with ethylene glycol in the presence of seeds and poly(vinyl pyrrolidone),Chem.Mater.2002.14(11),4736-4745.
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[15]G.Khanarian,J.Joo,X.-Q.Liu,P.Eastman,D.Werner,K.O Connell,and P.Trefonas.The optical and electrical properties of silver nanowire mesh films.Journal of Applied Physics 2013 114,024302.
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[23]S.Redner,Percolation and conduction in a random resistor-diodenetwork,J.Phys.A1981.14(9),L349-L354.
[2]L.B.Hu,D.S.Hecht,and G.Gruner,“Carbon nanotube thin films:Fabrication,properties,and applications,”Chem.Rev.2010.110(10),5790-5844.
[3]Kang,MG.Xu,T.Park,H.J.Luo,X.G.Guo,L.J.Efficiency Enhancement of Organic Solar Cells Using Transparent Plasmonic Ag Nanowire Electrodes.Adv.Mater.2010,22,4378.
[4]Mingjun Hu,Jiefeng Gao,Yucheng Dong,Kai Li,Guangcun Shan,Shiliu Yang,and Robert KwokYiu Li.Flexible Transparent PES/Silver Nanowires/PET Sandwich-Structured Film for High-Efficiency Electromagnetic Interference Shielding.Langmuir 2012,28,7101-7106.
[5]Y.G.Sun,Y.D.Yin,B.T.Mayers,T.Herricks,and Y.N.Xia,Uniform silver nanowires synthesis by reducing Ag NO3 with ethylene glycol in the presence of seeds and poly(vinyl pyrrolidone),Chem.Mater.2002.14(11),4736-4745.
[6]W.Gaynor,G.F.Burkhard,M.D.Mc Gehee,and P.Peumans,Smooth nanowire/polymer composite transparent electrodes,Adv.Mater.2011.23(26),2905.
[7]G.E.Pike and C.H.Seager,Percolation and conductivity:A computer study.I,Phys.Rev.B 1974.10(4),1421.
[8]Q.Cao,H.S.Kim,N.Pimparkar,J.P.Kulkarni,C.J.Wang,M.Shim,K.Roy,M.A.Alam,and J.A.Rogers,Mediumscale carbon nanotube thin film integrated circuits on flexible plastic substrates,Nature 2008 454,495-500.
[9]D.Stauffer and A.Aharony,Introduction to Percolation Theory(CRC Press,1994).
[10]C.Pennetta,G.Trefan,and L.Reggiani,Scaling law of resistance fluctuations in stationary random resistor networks,Phys.Rev.Lett.2000 85(24),5238-5241.
[11]S.De,P.J.King,P.E.Lyons,U.Khan,and J.N.Coleman,Size effects and the problem with percolation in nanostructured transparent conductors,ACS Nano 2010 4(12),7064-7072.
[12]S.M.Bergin,Y.H.Chen,A.R.Rathmell,P.Charbonneau,Z.Y.Li,and B.J.Wiley,The effect of nanowire length and diameter on the properties of transparent,conducting nanowire films,Nanoscale 2012 4(6),1996-2004.
[13]C.Bohren and D.Huffman,Absorption and Scattering of Light by Small Particles(Wiley VCH,1983).
[14]A.D.Rakic,A.B.Djurisic,J.M.Elazar,and M.Majewski,Optical properties of metallic films for vertical cavity optoelectronci devices,”Appl.Opt.1998.37(22),5271.
[15]G.Khanarian,J.Joo,X.-Q.Liu,P.Eastman,D.Werner,K.O Connell,and P.Trefonas.The optical and electrical properties of silver nanowire mesh films.Journal of Applied Physics 2013 114,024302.
[16]A.Heilmann,Polymer Films with Embedded Metal Nanoparticles(Springer,2003),Vol.52.
[17]H.C.Van De Hulst,Light Scattering by Small Particles(Dover,1957);[18]A.Killey and G.H.Meeten,Optical extinction and refraction of concentrated latex dispersions,”J.Chem.Soc.,Faraday Trans.1981.2 77(4),587-599.
[19]G.H.Meeten,An anomalous diffraction theory of linear birefringence and dichroism in colloidal dispersions,J.Colloid Interface Sci.1982 87(2),407-415.
[20]R.G.Barrera,A.Reyes-Coronado,and A.Garc_?a-Valenzuela,Nonlocal nature of the electrodynamic response of colloidal systems,Phys.Rev.B 2007.75(18),184202.
[21]I.Balberg and S.Bozowski,Percolation in a composite of random stick-like conducting particles,Solid State Commun.1982.44(4),551-554.
[22]I.Balberg,C.H.Anderson,S.Alexander,and N.Wagner,Excluded volume and its relation to the onset of percolation,Phys.Rev.B1984.30(7),3933.
[23]S.Redner,Percolation and conduction in a random resistor-diodenetwork,J.Phys.A1981.14(9),L349-L354.