Synthesis of copper/cross-linked poly(vinyl alcohol) (PVA) nanocables via a simple hydrothermal route

Abstract

Cross-linking reaction of poly(vinyl alcohol) (PVA) can be initiated in the presence of copper ions, resulting in the formation of copper@cross-linked PVA nanocables by a one-step hydrothermal approach. In contrast to our previous findings in the case of silver ions, metal ions with high valency are more difficult to reduce during the cross-linking reactions under hydrothermal conditions. The variation of pH value during the reaction has significant effects on the quality of the product. Copper@cross-linked PVA nanocables with a diameter of 0.5-1 mm and length up to 100 mm can be obtained at 200 uC, accompanying the presence of some cross-linked PVA aggregates with near spherical shape and irregular shape. The pH value, reaction temperature, and reaction time play key roles in the formation of such nanocables. The results demonstrated that the crosslinking reaction in the presence of different metal ions has different reaction rates, which determine the uniformity of the product and the quality of the cable-like core-shell structures.

Manipulated Electrospun PVA Nanofibers with Inexpensive Salts

“…The peaks at 831, 1 088, 1 319, 1 413, 2 904, 2 949, and 3 288 cm À1 are the characteristic PVA absorption bands. [36,37] However, there are no specific absorption peaks except the ones appeared at 1 413 and 1319 cm À1 , which are corresponding to the CÀC and ÀCH 2 stretch bands, respectively. [24] For the spectra, Figure 11(b) and (c) of 0.3 and 0.5 wt.-% NaCl, the ratios of relative height of these two peaks are almost the same as compared to that of the pristine PVA.…”

Anomalous high capacitance in a coaxial single nanowire capacitor

“…Hydrothermal reaction (Fig. 1a,b) was used to prepare PVA-coated copper nanowires templates [11][12][13][14][15]29 . The copper source was CuCl (0.1 g, 1 mmol) mixed with an aqueous PVA solution (6 wt.…”

“…1a,b) to prepare PVA-coated copper nanowires templates [11][12][13][14][15] , following an annealing process that subsequently converts the copper nanowires into Cu-Cu 2 O-C coaxial structures (Fig. 1c, Supplementary Figs S1 and S2).…”

Microwave‐Assisted Synthesis of Crosslinked Poly(vinyl alcohol) Nanocomposites Comprising Single‐Walled Carbon Nanotubes, Multi‐Walled Carbon Nanotubes, and Buckminsterfullerene

“…It is well known that PVA chains will crosslink after treatment at elevated temperature (%250 8C) [30] and recently such PVA crosslinked Cu was prepared via hydrothermal treatment at 200 8C for 72 h. [31] However, in the present process, PVA crosslinking occurred at a relatively low temperature (100 8C) with SWNT, MWNT and C-60, under the influence of MW irradiation. It is worth mentioning that PVA crosslinking occurs within 5 min of MW irradiation but all the reactions were conducted for extended time to ensure complete crosslinking.…”