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Title:Ultralow duty cycle chopper instigated low power continuous wave laser assisted synthesis of silver nanoparticles : a novel approach
Authors:ID Swapna, Mohanachandran Nair Sindhu (Author)
ID Ashik, Abdul Rahim Sajeela Beevi (Author)
ID Krishnanunni, Ramachandran Nair Amba Devi (Author)
ID Nampoori, Vadakkedathu Parameswaran Narayanan (Author)
ID Sankararaman, Sankaranarayana Iyer (Author)
Work type:Unknown
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:This paper is the first report of advancement in the drastic reduction of the laser power density from 105 to 7.5 W/cm2 for the synthesis of silver nanoparticles (SNPs) using a low power (60 mW) continuous-wave (cw) laser and a specially designed ultralow duty cycle (3%) optical chopper wheel for modulating the laser beam at low frequencies (2 Hz). The target is irradiated by keeping it in a liquid medium at 40–60 °C to produce quantum dots to SNPs of size less than 40 nm. The UV-visible spectroscopic and electron microscopic analyses confirm the formation of quantum dots and SNPs of size-dependent bandgap energy varying from 1.92 to 2.37 eV. The photoluminescence studies not only support the above observations but also reveal the blue emission upon UV excitation through the chromaticity diagram. The proposed greener approach using the low power cw laser is cost-effective when compared with the high-power laser-assisted synthesis of SNPs reported until now.
Keywords:cw laser, silver nanoparticle, ultralow duty cycle, chopper
Year of publishing:2020
Number of pages:str. 042017-1-042017-8
Numbering:Vol. 32, iss. 4
PID:20.500.12556/RUNG-7405 New window
COBISS.SI-ID:113331203 New window
ISSN on article:1938-1387
DOI:10.2351/7.0000215 New window
Publication date in RUNG:30.06.2022
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Record is a part of a journal

Title:Journal of laser applications
Shortened title:J. laser appl.
Publisher:Chapman & Hall
COBISS.SI-ID:521458457 New window