Rational Synthesis of Cylindrical Silver Single-crystalline Nanowires via Poly(vinyl pyrrolidone) Reduction of AgCl  

作　　者：DUAN Junyuan YANG Rui HAN Meng LIU Bingxin WANG Yilong GUAN Jianguo 段君元;YANG Rui;HAN Meng;刘秉鑫;WANG Yilong;官建国(State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China;School of Mechanical Engineering,Qinghai University,Xining 810016,China)

机构地区：[1]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China [2]School of Mechanical Engineering,Qinghai University,Xining 810016,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2020年第3期473-481,共9页武汉理工大学学报（材料科学英文版）

基　　金：Funded in Part by the National Natural Science Foundation of China(No.51521001);the Chunhui Program of the Ministry of Education of the People’s Republic of China(No.Z2015040);the Natural Science Foundation of Qinghai Province(No.2015-ZJ-946Q)。

摘　　要：We presented a simple yet convenient hydrothermal approach for the large-scale synthesis of uniform cylindrical silver (Ag) single-crystalline nanowires with diameters of about 25 nm and lengths of 1-4 μm. Poly(vinyl pyrrolidone) (PVP) was used as a reducing agent, and AgCl was used as a precursor to deliberately control [Ag^+] at a low degree in the overall reaction process through its dynamic equilibrium by directly reducing AgCl with PVP at a quasi-equilibrium growth condition. The as-obtained products were characterized by powder X-ray diffraction (XRD) patterns, field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), infrared spectra (IR) and Raman spectra. Factors such as [PVP], reaction temperature, time, and species of reducing agents and precursors were investigated to have strong influences on the morphologies and structures of the resultant Ag nanostructures. The wire diameter can conveniently be adjusted between 25 and 50 nm by simply adjusting [PVP], reaction temperature and reducing agent species. The as-synthesized silver nanowires can be self-assembled into perfect order arrays after being dried on tin foil due to the PVP coating on the surface, the circular cross-section and the uniform diameter of the Ag nanowires. These special silver nanowires with a core-shell structure as well as their spontaneous self-assembly of order arrays are expected to provide potential applications in flexible conductors, dielectric materials, electromagnetic shielding materials and nano-devices.

关 键 词：SILVER NANOWIRES poly(vinyl pyrrolidone) hydrothermal approach self-assembly 

分 类 号：O614.122[理学—无机化学] TB383.1[理学—化学]