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Open Access Nano Express

Study of nanostructure growth with nanoscale apex induced by femtosecond laser irradiation at megahertz repetition rate

Nikunj B Patel1, Bo Tan1* and Krishnan Venkatakrishnan2

Author affiliations

1 Department of Aerospace Engineering, Ryerson University, Victoria Street, Toronto, ON M5B 2K3, Canada

2 Department of Mechanical and Industrial Engineering, Ryerson University, Victoria Street, Toronto, ON M5B 2K3, Canada

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Citation and License

Nanoscale Research Letters 2013, 8:185  doi:10.1186/1556-276X-8-185

Published: 22 April 2013

Abstract

Leaf-like nanostructures with nanoscale apex are induced on dielectric target surfaces by high-repetition-rate femtosecond laser irradiation in ambient conditions. We have recently developed this unique technique to grow leaf-like nanostructures with such interesting geometry without the use of any catalyst. It was found to be possible only in the presence of background nitrogen gas flow. In this synthesis method, the target serves as the source for building material as well as the substrate upon which these nanostructures can grow. In our investigation, it was found that there are three possible kinds of nanotips that can grow on target surfaces. In this report, we have presented the study of the growth mechanisms of such leaf-like nanostructures under various conditions such as different laser pulse widths, pulse repetition rates, dwell times, and laser polarizations. We observed a clear transformation in the kind of nanotips that grew for the given laser conditions.

Keywords:
Laser material processing; Leaf-like nanostructures; Nanostructure growth mechanism