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Copper nanocoils synthesized through solvothermal method.

Liu Y, Liu X, Zhan Y, Fan H, Lu Y - Sci Rep (2015)

Bottom Line: In the liquid solution, nanosprings could be formed from relaxed nanocoils and demonstrated high elasticity.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.

View Article: PubMed Central - PubMed

Affiliation: Institute of Photonics and Photon Technology, Northwest University, Xi'an, Shaanxi, 710069, China.

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.

No MeSH data available.


Related in: MedlinePlus

Scheme shows different evolutionary routes.The stages on red branches start from bent nanocurves with non-aligned ends (a), end in nanosprings (d) and closed nanocoils (e), inserted images from left to right show a bent nanocurve (a) and a multi-turns nanocoils (c) respectively. Nanospring (d) is formed from a stretched nanocoil (c). One possible branch towards fast-knot structure (f) is also shown; Stages on blue branch start from closed single-turn nanoring and end in widened nanobelt (b).
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f4: Scheme shows different evolutionary routes.The stages on red branches start from bent nanocurves with non-aligned ends (a), end in nanosprings (d) and closed nanocoils (e), inserted images from left to right show a bent nanocurve (a) and a multi-turns nanocoils (c) respectively. Nanospring (d) is formed from a stretched nanocoil (c). One possible branch towards fast-knot structure (f) is also shown; Stages on blue branch start from closed single-turn nanoring and end in widened nanobelt (b).

Mentions: Therefore, the evolution routes in this solvothermal system can be derived and summarized in Fig. 4. At first some internal or external forces (induced by restricted growth circumstance, for example) bent (parts of) copper nanowires to form nanocurves (stage a) and nanorings (stage b), from nanocurves with misaligned opposite ends (stage a), multi-turns nanocoils and nanosprings (stages c and d respectively, along the red route in scheme, stages e represents grown nanocoils with closed ends) are synthesized sequentially. In long run, end-closed nanorings, nanobelts, nanocoils, and part of non-closed nanocoils with adhesive sections, can survive in a steady form. Unlike the case of ZnO nanorings17, elemental copper is isotropic material with non-polar surfaces, polarization-induced attractions between neighboring turns and closing ends cannot exist. Other helical structures prepared in liquid phase systems usually are results of template-guide or restrict262728, those nanorings usually have diameters less than 100 nanometers, hindering their applications in certain areas, whereas copper nanocoils and nanosprings prepared in our method have much larger diameters of dozens up to hundreds of microns. Compared with products from other fabrication techniques (non-liquid phase methods, e.g. glancing angle deposition (GLAD) or microfabrication), our nanocoils have nearly perfect circular/helical and single crystalline structures, with better mechanical properties, especially elasticity32. In addition to Cu, our method can potentially be extended in preparing nanocoils of noble metals such as silver35, with better corrosion/ oxidation resistance, which could be very useful for environmental applications and surface enhanced Raman scattering (SERS) applications. Further research is needed to fully uncover the formation mechanisms and further enhance the yield and uniformity of the helical nanostructure products. Nevertheless, these metallic nanocoils and nanosprings should be unique and can be immediately useful for many functional nanodevice research. Their deformation in growth and corresponding evolution in lattice structure, their mechanic property measurement in liquid circumstance, their reaction to external electronic and magnetic fields are also interesting topics.


Copper nanocoils synthesized through solvothermal method.

Liu Y, Liu X, Zhan Y, Fan H, Lu Y - Sci Rep (2015)

Scheme shows different evolutionary routes.The stages on red branches start from bent nanocurves with non-aligned ends (a), end in nanosprings (d) and closed nanocoils (e), inserted images from left to right show a bent nanocurve (a) and a multi-turns nanocoils (c) respectively. Nanospring (d) is formed from a stretched nanocoil (c). One possible branch towards fast-knot structure (f) is also shown; Stages on blue branch start from closed single-turn nanoring and end in widened nanobelt (b).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4660362&req=5

f4: Scheme shows different evolutionary routes.The stages on red branches start from bent nanocurves with non-aligned ends (a), end in nanosprings (d) and closed nanocoils (e), inserted images from left to right show a bent nanocurve (a) and a multi-turns nanocoils (c) respectively. Nanospring (d) is formed from a stretched nanocoil (c). One possible branch towards fast-knot structure (f) is also shown; Stages on blue branch start from closed single-turn nanoring and end in widened nanobelt (b).
Mentions: Therefore, the evolution routes in this solvothermal system can be derived and summarized in Fig. 4. At first some internal or external forces (induced by restricted growth circumstance, for example) bent (parts of) copper nanowires to form nanocurves (stage a) and nanorings (stage b), from nanocurves with misaligned opposite ends (stage a), multi-turns nanocoils and nanosprings (stages c and d respectively, along the red route in scheme, stages e represents grown nanocoils with closed ends) are synthesized sequentially. In long run, end-closed nanorings, nanobelts, nanocoils, and part of non-closed nanocoils with adhesive sections, can survive in a steady form. Unlike the case of ZnO nanorings17, elemental copper is isotropic material with non-polar surfaces, polarization-induced attractions between neighboring turns and closing ends cannot exist. Other helical structures prepared in liquid phase systems usually are results of template-guide or restrict262728, those nanorings usually have diameters less than 100 nanometers, hindering their applications in certain areas, whereas copper nanocoils and nanosprings prepared in our method have much larger diameters of dozens up to hundreds of microns. Compared with products from other fabrication techniques (non-liquid phase methods, e.g. glancing angle deposition (GLAD) or microfabrication), our nanocoils have nearly perfect circular/helical and single crystalline structures, with better mechanical properties, especially elasticity32. In addition to Cu, our method can potentially be extended in preparing nanocoils of noble metals such as silver35, with better corrosion/ oxidation resistance, which could be very useful for environmental applications and surface enhanced Raman scattering (SERS) applications. Further research is needed to fully uncover the formation mechanisms and further enhance the yield and uniformity of the helical nanostructure products. Nevertheless, these metallic nanocoils and nanosprings should be unique and can be immediately useful for many functional nanodevice research. Their deformation in growth and corresponding evolution in lattice structure, their mechanic property measurement in liquid circumstance, their reaction to external electronic and magnetic fields are also interesting topics.

Bottom Line: In the liquid solution, nanosprings could be formed from relaxed nanocoils and demonstrated high elasticity.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.

View Article: PubMed Central - PubMed

Affiliation: Institute of Photonics and Photon Technology, Northwest University, Xi'an, Shaanxi, 710069, China.

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.

No MeSH data available.


Related in: MedlinePlus