Abstract
Uniform silica nanoparticles and jellyfish-like nanowires were synthesized by a chemical vapour deposition method on Si substrates treated without and with Ni(NO3)2, using silicon powder as the source material. Composition and structural characterization using field emission scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy and fourier-transform infrared spectroscopy showed that the as-prepared products were silica nanoparticles and nanowires which have amorphous structures. The form of nanoparticles should be related to gas-phase nucleation procedure. The growth of the nanowires was in accordance with vapour-liquid-solid mechanism, followed by Ostwald ripening to form the jellyfish-like morphology. Photoluminescence and cathodoluminescence measurements showed that the silica products excited by different light sources show different luminescence properties. The emission spectra of both silica nanoparticles and nanowires are due to the neutral oxygen vacancies (≡Si-Si≡). The as-synthesized silica with controlled morphology can find potential applications in future nanodevices with tailorable photoelectric properties.
Highlights
Uniform silica nanoparticles and jellyfish-like nanowires were synthesized by a chemical vapour deposition method on Si substrates treated without and with Ni(NO3)[2], using silicon powder as the source material
Without using templates, relatively uniform silica nanoparticles can be synthesized on Si wafer when the Si substrate was untreated by Ni(NO3)[2] solution
Together with HRTEM, SAED and the energy dispersive X-ray spectroscopy (EDS) results measured in SEM and TEM, we roughly considered the as-prepared ball-like products were amorphous silica NPs
Summary
Uniform silica nanoparticles and jellyfish-like nanowires were synthesized by a chemical vapour deposition method on Si substrates treated without and with Ni(NO3)[2], using silicon powder as the source material. The as-synthesized silica with controlled morphology can find potential applications in future nanodevices with tailorable photoelectric properties Nanomaterials, such as nanoparticles (NPs)[1,2,3], nanowires (NWs)[4,5,6] and nanofilms (NFs)[7,8,9], have been received steadily growing attention as a result of their peculiar and fascination properties. NWs products, which are of benefit to understanding the relationship between morphology and luminescence properties of silica nanostructures, and their optical properties in different excitation source We think these researches could provide a facile method for the synthesis of silica NPs and NWs, and are a great help for the application of silica nanostructures in fluorescence labeling medicine or new generation nanodevices with tunable photoelectric properties
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
