晶种法制备高长径比纳米银线的研究
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摘要
利用AgNO_3和NaCl反应生成的AgCl颗粒作为晶种合成纳米银线。详细研究了纳米银线在溶液中的生长过程,探讨了AgCl晶种与银源AgNO_3物质的量的比和反应时间对纳米银线形貌的影响。通过SEM、TEM、XRD、紫外可见光光谱等测试方法,对纳米银线的生长过程和不同条件下制备的纳米银线的微观形貌和晶体结构进行表征。实验表明,纳米银线是在AgCl颗粒表面上定向生长,AgCl与AgNO_3物质的量的比和反应时间影响纳米银线的长度和直径大小。当AgCl与AgNO_3的物质的量比为1∶5,反应时间4 min时,制备的纳米银线平均直径52 nm,长径比超过了1000。
Silver nanowires(AgNWs) were synthesized by utilizing AgCl particles(reaction products between AgNO_3 and NaCl) as the seeds. The growth process of AgNWs was investigated in detail. The effect of molar ratios of AgCl to AgNO_3 and reaction time of AgCl seeds on morphology of AgNWs was dicussed. The growth process of AgNWs,all microcosmic morphology and crystalline structures of the silver products prepared in different condition were characterized through scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray diffraction(XRD) and ultraviolet-visible spectrophotometer(Uv-vis). The results show that AgNWs grow anisotropically on the surface of AgCl particles. Moreover,the molar ratios of AgCl to AgNO_3 and reaction time of AgCl seeds play important roles in the length and diameter of AgNWs. The AgNWs with 52 nm in diameter and aspect ratio above 1000 were synthesized when the molar ratio of AgCl to AgNO_3 is 1∶ 5 and the reaction time between AgNO_3 and NaCl was 4 min.
Silver nanowires(AgNWs) were synthesized by utilizing AgCl particles(reaction products between AgNO_3 and NaCl) as the seeds. The growth process of AgNWs was investigated in detail. The effect of molar ratios of AgCl to AgNO_3 and reaction time of AgCl seeds on morphology of AgNWs was dicussed. The growth process of AgNWs,all microcosmic morphology and crystalline structures of the silver products prepared in different condition were characterized through scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray diffraction(XRD) and ultraviolet-visible spectrophotometer(Uv-vis). The results show that AgNWs grow anisotropically on the surface of AgCl particles. Moreover,the molar ratios of AgCl to AgNO_3 and reaction time of AgCl seeds play important roles in the length and diameter of AgNWs. The AgNWs with 52 nm in diameter and aspect ratio above 1000 were synthesized when the molar ratio of AgCl to AgNO_3 is 1∶ 5 and the reaction time between AgNO_3 and NaCl was 4 min.
引文
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[4] Lee J G,Lee J H,An S,et al. Highly Flexible,Stretchable,Wearable,Patternable and Transparent Heaters on Complex 3D Surfaces Formed from Supersonically Sprayed Silver Nanowires[J]. Journal of Materials Chemistry A,2017,5(14):6677-6685.
[5] Hu Y,Zhang Y,Xu C,et al. High-Output Nanogenerator by Rational Unipolar Assembly of Conical Nanowires and Its Application for Driving a Small Liquid Crystal Display[J]. Nano Letters,2010,10(12):5025-5031.
[6] Hu L,Kim H S,Lee J Y,et al. Scalable Coating and Properties of Transparent,Flexible,Silver Nanowire Electrodes[J]. Acs Nano,2010,4(5):2955-2963.
[7] Li B,Ye S,Stewart I E,et al. Synthesis and Purification of Silver Nanowires To Make Conducting Films with a Transmittance of 99%[J]. Nano Letters,2015,15(10):6722-6726.
[8] Leem D S,Edwards A,Faist M,et al. Efficient Organic Solar Cells with Solution-processed Silver Nanowire Electrodes[J]. Advanced Materials,2011,23(38):4371-4375.
[9] Zong R L,Zhou J,Li Q,et al. Synthesis and Optical Properties of Silver Nanowire Arrays Embedded in Anodic Alumina Membrane[J]. Journal of Physical Chemistry B,2004,108(43):16713-16716.
[10] Sun Y G,Yin Y D,Xia Y N,et al. Uniform Silver Nanowires Synthesis by Reducing Ag NO3with Ethylene Glycol in the Presence of Seeds and Poly(Vinyl Pyrrolidone)[J]. Chemistry of Materials,2002,14(11):4736-4745.
[11] Tang C,Sun W,Lu J,et al. Role of the Anions in the Hydrothermally Formed Silver Nanowires and Their Antibacterial Property[J]. Journal of Colloid&Interface Science,2014,416(416):86-94.
[12] Yang Y,Hu Y,Xiong X,et al. Impact of Microwave Power on the Preparation of Silver Nanowires via a Microwave-Assisted Method[J]. Rsc Advances,2013,3(22):8431-8436.
[13] Sun Y,Gates B,Brian M A,et al. Crystalline Silver Nanowires by Soft Solution Processing[J]. Nano Letters,2002,2(2):165-168.
[14] Ran Y,He W,Wang K,et al. A One-Step Route to Ag Nanowires with a Diameter below 40 nm and an Aspect Ratio above 1000[J]. Chemical Communications,2014,50(94):14877-14880.
[15] Liu Y,Chen Y,Shi R,et al. High-Yield and Rapid Synthesis of Ultrathin Silver Nanowires for Low-Haze Transparent Conductors[J]. Rsc Advances,2017,7(9):4891-4895.
[16] Gou L,Mircea C A,Zaleski J M. Convenient,Rapid Synthesis of Ag Nanowires[J]. Chemistry of Materials,2007,19(7):1755-1760.
[17] Coskun S,Aksoy B,Unalan H E. Polyol Synthesis of Silver Nanowires:an Extensive Parametric Study[J]. Crystal Growth&Design,2011,11(11):4963-4969.
[18] Jin R,Cao Y C,Hao E,et al. Controlling Anisotropic Nanoparticle Growth through Plasmon Excitation[J]. Nature,2003,425(6957):487-490.
[19] Korte K E,Skrabalak S E,Xia Y N. Rapid Synthesis of Silver Nanowires Through a CuCl-or CuCl2-Mediated Polyol Process[J]. Journal of Materials Chemistry,2008,18(4):437-441.