The investigation of a hydro-thermal method to fabricate Cu@C coaxial nanowires and their special electronic transport and heat conduction properties

Abstract

A hydro-thermal method for the preparation of single-crystalline copper@carbon nanowires (Cu@C NWs) with outer diameters between 60 and 120 nm and lengths ranging from 5 mm up to 20 mm is reported. After an oxygen feeding treatment of the copper core the carbon wrapped Cu-cable is transformed into an empty carbon nanotube. We show that there is dissolution-deposition dynamic balance within the carbon shell, which involves the Cu in a reversible filling-emptying process repeatedly. The obtained nanowires were characterized by scanning electron microscopy (SEM), tunneling electron microscopy (TEM), X-ray diffraction (XRD), and Raman spectroscopy respectively. In addition, electronic transport properties of single nanowires and enhancement in thermal conductivity of thermal grease modified by as-prepared Cu@C nanocomposites have also been discussed.

Copper@carbon coaxial nanowires synthesized by hydrothermal carbonization process from electroplating wastewater and their use as an enzyme-free glucose sensor

“…Furthermore, it can also be observed from the TG curve that a distinct weight gain emerged in the 200-400℃ range, however, the curve around 260-310℃ was a little indent, which reflect a combination of weight loss (arising from the conversion from the exterior carbonaceous shell to CO 2 on the basis of FTIR analysis) and weight gain (arising from the oxidation of Cu core to CuO). It's important to note that the carbonaceous shell (3-8 nm) obtained in our experiment was dramatically thinner than the Cu core (~150 nm), which resulted in the larger relative quantities of Cu to C in contrast with that of the previous report [31] about the Cu@C cable composites prepared in autoclave (in which the thicknesses of the shell and core were nearly ~30 and ~90 nm, respectively, and the remarkable weight loss occurred in the 400-750℃ range), thus the weight loss is neglected by the increase of element O in present work, and finally the trend of the TGA curve were different in these two cases. Herein it can be seen that the thickness of carbon shells is a very important issue for NWs oxidation activity.…”

Cu–Ag core–shell nanowires for electronic skin with a petal molded microstructure

“…12 However, CuNWs are very sensitive to oxygen which greatly hinders their development. Although coating a thin layer of materials (Ni, [13][14][15][16] Pt, 17,18 Au, 13,19 Zn, 20 Sn, 20 Ag, 21,22 AZO, 23 carbon materials, [24][25][26][27] etc.) on CuNWs is an effective way to prevent the oxidation of CuNWs, these methods are usually electrodeposition methods, chemical or physical vapor deposition (CVD or PVD), one pot or two pot methods at high temperature (210 1C), etc.…”

Facile fabrication of reduced graphene oxide encapsulated copper spherical particles with 3D architecture and high oxidation resistance

“…Copper-carbon composite materials have attracted increasing attentions for various applications including electric devices, electrodes, catalysts, etc. [1][2][3][4][5][6][7][8][9][10] Compared to the high cost of Ag, cheap Cu has similar high electrical and thermal conductivity. However, Cu is easily oxidized even under ambient atmospheres, which would hinder its more widespread applications.…”