Influence of substrate temperature on the properties of pulsed laser deposited silver nanoparticle thin films and their application in SERS detection of bovine serum albumin

Green Synthesized Ag Nanoparticles for Bio-Sensing and Photocatalytic Applications

“…Figure shows the absorbance spectra of Ag NPs prepared using different leaf extract solutions. The presence of SPR peak in the visible region confirms the formation of Ag NPs. − The free conduction electrons present in MNPs are responsible for the SPR absorption band as a result of their vibrations in resonance with incoming photons. , The SPR bands of Ag NPs were around 446, 456, 443, and 347 nm for neem, aloe vera, Indian mint, and guava leaves, respectively. The absorbance spectra of Ag NPs prepared using aloe vera leaves exhibit an additional peak at around 370 nm, which can be attributed to the quadrupolar resonance in addition to the primary dipole resonance. , The size of Ag NPs was determined using eq and is tabulated in Table …”

“…Metal nanoparticles (MNPs) have always been a subject of great interest because of their high conductivity, large surface-to-volume ratio, plasmonic properties, and so forth. − The tuning of the surface plasmon resonance (SPR) of MNPs is widely studied to explore its practical application in sensors, biodevices, data storage, spectroscopic techniques, catalysis, and so forth. − SPR is the resonant oscillation of conduction electrons with respect to the positive ion core under appropriate light illumination, and it mainly depends on the shape, size of the MNPs, and the surrounding dielectric medium. , SPR properties thus help us to amplify and manipulate the light at the nanoscale level and therefore increase the sensitivity and resolution of optical devices . Among various MNPs, silver (Ag) nanoparticles are widely studied because of their high conductivity, good light absorption, high sensitivity, resolution, antibacterial activity, and chemical stability. − Ag NPs are attractive for biosensing applications because the SPR of Ag NPs is highly influenced by the surface-adsorbed molecules, and the wavelength of SPR can be tuned by the concentration of adsorbed molecules. , Therefore, the sensing ability of Ag NPs using different analytes such as glucose, triacylglyceride, and so on has been explored. ,,, In our previous work, pulsed laser-deposited Ag NPs were investigated for glucose sensing and achieved a sensitivity of 14.8 nm/mM . Recently, MNPs are considered as a class of efficient photocatalysts because of their additional advantages compared to conventional semiconductor-based photocatalysts including the better affinity to many reactants and ability to utilize the full solar spectrum .…”

Fabrication of silver nanoisland films by pulsed laser deposition for surface-enhanced Raman spectroscopy

“…In PLD, the materials are deposited on a substrate through laser ablation from a target located opposite to the substrate. Deposition is typically performed in vacuum [20] or argon atmosphere [19] and by the change of parameters such as laser wavelength, pulse duration or laser fluence it is possible to modify the structure of the fabricated nanoislands. Until now, gold and silver nanoisland films have been fabricated by PLD using different lasers with different wavelengths and parameters [19–25].…”

“…Until now, gold and silver nanoisland films have been fabricated by PLD using different lasers with different wavelengths and parameters [19–25]. The most commonly used lasers are KrF excimer lasers with a wavelength of 248 nm [20–24], however other wavelengths from UV (193 nm, 266 nm, 308 nm, 355 nm), through vis (527 nm, 532 nm [19]) to IR (1064 nm) have also been used. Even though several studies were reported on the PLD fabrication of plasmonic metal films, there are only a few recent studies discussing an influence of a wider range of deposition process parameters on the morphology and optical properties of the films [19].…”

An overview of surface-enhanced Raman scattering substrates by pulsed laser deposition technique: fundamentals and applications

“…Kamakshi et al [ 125 ] showed the effect of substrate temperature on the morphology of Ag NPs, which were grown by means of the Volmer-Weber growth mode [ 126 ] at the substrate temperature ranging from 100 to 500 °C and the maximum size of Ag NPs appeared at substrate temperature of 300 °C. They noticed that the Ag NPs size and substrate temperature followed a non-linear relationship, meaning that there was more than one competing growth mechanism.…”