Taj Muhammad Khan*
School of Physics and CRANN, Trinity College Dublin, the University of Dublin, Ireland
*Corresponding author: Taj Muhammad Khan, School of Physics and CRANN, Trinity College Dublin, the University of Dublin, Dublin, Ireland
Submission: July 23, 2018; Published: September 24, 2018
ISSN: 2576-8840 Volume8 Issue1
Nanotechnology has emerged a multidisciplinary technology, feeding to all sectors of nano-sciences and nanoengineering. Smart materials with entirely altered chemical and physical properties and devising new technological methods for producing such materials is the priority of nanotechnology. While working in this direction, recently a new method of atmospheric PLD was explored and developed. This method shifts the fabrication of plasmonic nanomaterials into a completely simple, feasible, environmentally friendly and industrial oriented technique. In this newly introduced method, ablation plume is produced at atmospheric pressure in the interaction of a high-power laser with a target and is captured by the gas to form a nanoparticle (NP) aerosol. The aerosol is transported by adopting various approaches to produce NP film-based SERS substrates for chemical detection.
Keywords: New synthesis methods in material science; APLD; Nanomaterials; NP film; NP aerosol
In this short letter, a new method is introduced, which is recently emerged and provides a sound and feasible route to make plasmonic nanomaterials. The method is based on the pulsed laser ablation in gas at atmospheric pressure. At these conditions, the hydrodynamic expansion of a laser produced plasma plume is significantly different from its expansion in vacuum or lowpressure gas. In vacuum or low-pressure gas (< 0.1mbar), ablation plume expands freely away from the target compared atmospheric pressure where ambient gas severely restricts the plume expansion to 1-3mm. To efficiently utilize the ablation process at atmospheric pressure, a novel method of atmospheric PLD (APLD) was recently introduced and applied to produce NP film [1,2]. The films produced by this method were effective SERS substrates used in surface enhanced Raman spectroscopy (SERS) . Initially, the method was used with ablation in confined geometry, where the plasma plume was artificially confined in a small region (gap) between the target and the deposited surface to produce a longlived dense plasma. The method so called confined geometry showed strong potential to make a layer of NPs with a single laser shot . APLD is alternative to classical vacuum PLD and marks the upper end of the pressure domain of vacuum PLD examined to date. At atmospheric pressure, the laser produced ablation plume dose not expand freely and is restricted above the target surface to form a NP aerosol by collisional condensation . The produced NP aerosol is entrained in a gas flow or flowing atmospheric plasma to a substrate and build up a NP film. The newly introduced APLD method is technologically feasible with strong potential for industrial scale application. The method is constantly under investigation in direction of understanding to develop this method. The method will open a new fabrication route of new plasmonic materials to feed nanotechnology in various sectors.
In conclusion, the newly and recently emerged APLD method was briefly discussed. The method is under hot debate and successfully applied to make plasmonic nanomaterials. The method is based on flowing gas or flowing atmospheric plasma to transport NP aerosol to a deposited surface to make NP film. The method is relatively fast and has strong potential for industrial scale application.
© 2018 Taj Muhammad Khan . This is an open access article distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and build upon your work non-commercially.