High yield synthesis and lithography of silica-based nanospring mats

In this study we report a novel technology for synthesizing silica-based nanosprings with a yield higher than 90%, and with 100% repeatability. The nanospring mats are grown via the liquid–vapour–solid mechanism using a gold catalyst, where the deposition temperature can be as low as 350 ◦ C. XPS analysis shows that the as-grown nanosprings have components of silicon and oxygen with an atomic ratio close to silica. Both SEM and TEM images illustrate that the helical structure of the nanosprings is extremely uniform. Tw ot ypes of nanosprings are observed using TEM. The first type of silica nanospring is formed from a single nanowire, whereas the second type consists of multiple intertwined nanowires. Patterned deposition of nanosprings has been achieved using this technology.

[1]  David N. McIlroy,et al.  Nanospring formation—unexpected catalyst mediated growth , 2004 .

[2]  A. Alivisatos,et al.  Melting in Semiconductor Nanocrystals , 1992, Science.

[3]  K. Leong,et al.  Multifunctional nanorods for gene delivery , 2003, Nature materials.

[4]  P. A. Smith,et al.  Layer-by-Layer Assembly of Rectifying Junctions in and on Metal Nanowires † , 2001 .

[5]  L. Martinu,et al.  Spectroellipsometric characterization of plasma-deposited Au/SiO2 nanocomposite films , 2000 .

[6]  Choi,et al.  Size-dependent melting temperature of individual nanometer-sized metallic clusters. , 1990, Physical review. B, Condensed matter.

[7]  R. S. Wagner,et al.  VAPOR‐LIQUID‐SOLID MECHANISM OF SINGLE CRYSTAL GROWTH , 1964 .

[8]  L. Martinu,et al.  Temperature dependence of the surface plasmon resonance of Au/SiO2 nanocomposite films , 2000 .

[9]  G. Shen,et al.  Silicon carbide hollow nanospheres, nanowires and coaxial nanowires , 2003 .

[10]  Hai‐feng Zhang,et al.  Synthesis, Characterization, and Manipulation of Helical SiO2 Nanosprings , 2003 .

[11]  E. Bekyarova,et al.  Applications of Carbon Nanotubes in Biotechnology and Biomedicine. , 2005, Journal of biomedical nanotechnology.

[12]  C. Wagner.  NIST x-ray photoelectron spectroscopy (XPS) database , 1990 .

[13]  M. G. Norton,et al.  Silicon Carbide Nanosprings , 2003 .

[14]  Zhiyong Tang,et al.  Spontaneous Organization of Single CdTe Nanoparticles into Luminescent Nanowires , 2002, Science.

[15]  Peidong Yang,et al.  Direct Observation of Vapor-Liquid-Solid Nanowire Growth , 2001 .

[16]  Guanghai Li,et al.  Ordered indium-oxide nanowire arrays and their photoluminescence properties , 2001 .

[17]  F. Kruis,et al.  Evaporation of free PbS nanoparticles: evidence of the Kelvin effect. , 2002, Physical review letters.

[18]  C. J. Coombes.  The melting of small particles of lead and indium , 1972 .

[19]  Xiangfeng Duan,et al.  Synthesis and optical properties of gallium arsenide nanowires , 2000 .