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Ultralow duty cycle chopper instigated low power continuous wave laser assisted synthesis of silver nanoparticles
Sankaranarayana Iyer Sankararaman, V. P. N. Nampoori, R. A. Krishnanunni, A. S. Ashik, Mohanachandran Nair Sindhu Swapna, 2020, original scientific article

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.
Found in: ključnih besedah
Keywords: cw laser, silver nanoparticle, ultralow duty cycle, chopper
Published: 30.06.2022; Views: 487; Downloads: 22
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Effect of duty cycle on photothermal phenomenon – a thermal lens study
Swapna Mohanachandran Nair Sindhu, 2019, original scientific article

Found in: ključnih besedah
Summary of found: ...Photothermal phenomena Thermal lens technique Optical chopper Duty cycle variation...
Keywords: Photothermal phenomena Thermal lens technique Optical chopper Duty cycle variation
Published: 05.07.2022; Views: 472; Downloads: 0
.pdf Fulltext (1,30 MB)

Criticality of depth of intensity modulation and simulation of refractive index profile in thermal lens technique
Swapna Mohanachandran Nair Sindhu, 2020, original scientific article

Found in: ključnih besedah
Keywords: thermal lens, chopper
Published: 05.07.2022; Views: 427; Downloads: 0
.pdf Fulltext (2,44 MB)

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