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Fabrication of Highly Conductive Pd Nanowires using PDMS Transfer Method on DNA Scaffolds through Ethanol-Reduction
Hong-bing Cai1, Zhen-xing Wang*2, Jin-yang Liu3, Kun Zhang1, Xiao-ping Wang*1,3
1.Hefei National Laboratory for Physical Sciences at the Microscale and Department of Physics, University of Science and Technology of China, Hefei 230026, China;2.National Center for Nanoscience and Technology, Beijing 100190, China;3.Department of Physics, University of Science and Technology of China, Hefei 230026, China
Abstract:
We have developed a simple, productive, and effective poly(dimethysiloxane) (PDMS) trans-fer method to fabricate highly conductive Pd nanowires following DNA scaffolds on various substrates, based on ethanol-reduction at low temperature. Pd nanoparticles were selectively deposited and confined onto the DNA templates on a PDMS sheet to form Pd nanowires and then the nanowires were transferred to other various substrates with a low occurrence of par-asitic nanoparticles. The structure, morphology and the conductance of Pd nanowires were characterized with transmission electron microscopy, field emission scanning electron mi-croscopy, and electrical transport measurement, respectively. Moreover, the growth process of the Pd nanowires was investigated by varying the incubation time and reaction temper-ature. The present strategy provides a new method to fabricate extremely dense, highly conductive, and well aligned Pd nanowires on various substrates, which make it promising for building nanosensors and nanoelectronic devices.
Key words:  Pd nanowires, DNA template, Poly(dimethysiloxane) transfer, Ethanol reduc-tion
FundProject:
基于DNA模板与聚二甲基硅氧烷转移制备钯纳米线的新方法
蔡洪冰1, 王振兴*2, 刘金养3, 张琨1, 王晓平*1,3
1.中国科学技术大学合肥微尺度物质科学国家实验室(筹), 化学物理系,合肥230026;2.国家纳米科学中心,北京100190;3.中国科学技术大学物理系,合肥230026
摘要:
在聚二甲基硅氧烷衬底上梳理得到DNA阵列,并以DNA为模板通过低温乙醇还原得到Pd纳米线,再通过PDMS转移技术将Pd纳米线转移至不同的衬底,这是一种制备高导电性Pd纳米线的新方法.以DNA为模板的选择性生长控制方法可以显著抑制衬底上无规Pd纳米颗粒的出现. SEM观测制备的Pd纳米线的宽度约为80 nm,连续长度可达14 μm. FESEM、XPS和TEM表征揭示出Pd纳米线是由面心立方结构的Pd纳米晶粒组成,电学测量获得的Pd纳米线的电阻率为1.59 μΩm,仅比体电阻率高约一个量级. 研究还发现通过改变反应时间和温度可以有效调控Pd纳米线的生长过程.
关键词:  Pd纳米线,DNA模板,PDMS转移,乙醇还原
DOI:10.1063/1674-0068/26/05/607-611
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