Copper nanocoils synthesized through solvothermal method

Abstract

Recently helical nanostructures such as nanosprings and nanocoils have drawn great interests in nanotechnology, due to their unique morphologies and physical properties, and they may be potential building blocks in sorts of electromechanical, magnetic, photoelectronic and plasmonic devices at micro/nanoscales. In this report, multi-turns copper nanocoils were synthesized through a modified solvothermal method, in which the mixture of water and N-methyl-2-pyrrolidone (NMP) were selected as reaction medium and copolymer poly(1-vinylpyrrolidone-co-vinyl acetate) (PVP/VA 64E) as reductant. In the liquid solution, nanosprings could be formed from relaxed nanocoils and demonstrated high elasticity. These nanocoils and nanosprings are of single crystalline structure, with the characteristics wire diameters ranging from tens to a few hundreds of nanometers and the ring/coil diameters mostly ~10–35 microns. Their growth and deformation mechanisms were then investigated and discussed along with that of previously reported single-turn copper nanorings. This work could be of importance for researchers working on synthesis and applications of novel 1-D helical nanomaterials and their functional devices.

Single-chirality of single-walled carbon nanotubes (SWCNTs) through chromatography and its potential biological applications

“…49 Numerous studies have shown that the coil/ tori SWCNTs, are more stable under high pressure than their straight ones, showing excellent mechanical strength, electrical conductivity, and persistent current (I pc ). [50][51][52][53][54][55][56][57] However, the controlled structuring of SWCNTs that have always developed as long strings into a tori-like topology may open up new 39 Copyright John Wiley and sons, 2018. application possibilities. [58][59][60] Recently, the Pickering emulsion approach has been used to synthesize a toroidal carbon nanotube (TCN) by using the pure m-and sc-SWCNTs collected from gel chromatography.…”

Self-Assembly of Silver Nanowire Ring Structures Driven by the Compressive Force of a Liquid Droplet

“…The nanowire captured in the small-sized droplet can readily be deformed into various shapes because its length can be of longer than the droplet diameter. Thus, many researchers have carried out deformation of the nanowire into a desired structure along the droplet shape: coiling of colloidal gold nanowires, carbon nanotubes (CNTs) of 500 nm in diameter induced by the contraction of their polymer shells, and copper nanocoils of 10–35 μm in diameter synthesized using a solvothermal method . These coiled gold nanowires and CNTs would go through the uncoiling process as the polymer structure was removed, whereas the copper nanocoil process is limited to specific materials.…”

“…Thus, many researchers have carried out deformation of the nanowire into a desired structure along the droplet shape: coiling of colloidal gold nanowires, 12 carbon nanotubes (CNTs) of 500 nm in diameter induced by the contraction of their polymer shells, 13 and copper nanocoils of 10−35 μm in diameter synthesized using a solvothermal method. 14 These coiled gold nanowires and CNTs would go through the uncoiling process as the polymer structure was removed, whereas the copper nanocoil process is limited to specific materials. The coiled ring-shaped structures can be used in tunable plasmonic resonance because of selective penetrations of electromagnetic fields through the ring cavity.…”