Studies on the hypsochromic shifted optical properties of gold nanoparticles embedded electrospun poly(methyl methacrylate) (PMMA) nanofibers

Philip, Princy; Jose, Tomlal; Philip, Koshi; Manoj, P K; Sajini, T.

doi:10.1016/j.matpr.2020.03.681

Cited by 5 publications

(5 citation statements)

References 17 publications

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“…PbS quantum dots have many applications in various fields like solar cells, LEDs, optical fibers, and so on 1,9 . PMMA nanofibers are also used in many optical devices 15,44–46 . The results obtained in the present study show that the pure and structurally modified PMMA nanofibers incorporated with PbS quantum dots are marked with PL intensity enhancement.…”

Section: Resultssupporting

confidence: 56%

Structurally modified electrospun poly(methyl methacrylate) nanofibers as advanced host matrices for PbS quantum dots

Philip

Jose

Vanchippurackal

2021

J of Applied Polymer Sci

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The present work deals with the studies of the host matrix nature of pure and structurally modified surface roughened and coaxial hollow electrospun poly(methyl methacrylate) (PMMA) nanofibers to lead sulphide (PbS) quantum dots. The various structural and molecular analyses conducted on these samples proved the advancements and structural modifications made in the properties of pure PMMA nanofibers by electrospinning and selective dissolution. The successful incorporation of the quantum dots to pure and structurally modified PMMA nanofibers and hence the host matrix nature of these nanofibers is proved by different spectral analyses of the samples. The coaxial hollow PMMA nanofibers are found to be the best host matrix among these PMMA nanofibers as proved by the optical studies of the samples. Photoluminescence analyses of the samples showed the influence of these quantum dots on the optical properties of PMMA nanofibers. It is observed here that, the quantum dots enhance the intensity of coaxial hollow PMMA nanofibers to about four times than its virgin form. The pure and structurally modified PMMA nanofibers incorporated with PbS quantum dots are proved to be efficient for the degradation of methylene blue dye where coaxial hollow PMMA nanofibers incorporated with PbS quantum dots is the best.

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Section: Resultssupporting

confidence: 56%

Structurally modified electrospun poly(methyl methacrylate) nanofibers as advanced host matrices for PbS quantum dots

Philip

Jose

Vanchippurackal

2021

J of Applied Polymer Sci

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“…The position of the absorbance maxima of the measured spectra was always at wavelengths slightly higher than 400 nm (see Table 2 ). According to Petit et al [ 40 ], for small particles (≤30 Å), the position of the absorption maximum shifts, but the peak width of the surrounding medium is also changed. When the particles interact with the matrix only via weak interactions, there was a bathochromic shift (a redshift) and a slight broadening of the peak.…”

Section: Resultsmentioning

confidence: 99%

“…When the particles interact with the matrix only via weak interactions, there was a bathochromic shift (a redshift) and a slight broadening of the peak. On the contrary, with strong interactions, there was a hypso-chromic shift (a blue shift) [ 40 ] and a significant peak broadening.…”

Section: Resultsmentioning

confidence: 99%

Antibacterial Properties of Silver Nanoclusters with Carbon Support on Flexible Polymer

et al. 2022

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Here, we aimed at the preparation of an antibacterial surface on a flexible polydimethylsiloxane substrate. The polydimethylsiloxane surface was sputtered with silver, deposited with carbon, heat treated and exposed to excimer laser, and the combinations of these steps were studied. Our main aim was to find the combination of techniques applicable both against Gram-positive and Gram-negative bacteria. The surface morphology of the structures was determined by atomic force microscopy and scanning electron microscopy. Changes in surface chemistry were conducted by application of X-ray photoelectron spectroscopy and energy dispersive spectroscopy. The changes in surface wettability were characterized by surface free energy determination. The heat treatment was also applied to selected samples to study the influence of the process on layer stability and formation of PDMS-Ag or PDMS-C-Ag composite layer. Plasmon resonance effect was determined for as-sputtered and heat-treated Ag on polydimethylsiloxane. The heating of such structures may induce formation of a pattern with a surface plasmon resonance effect, which may also significantly affect the antibacterial activity. We have implemented sputtering of the carbon base layer in combination with excimer laser exposure of PDMS/C/Ag to modify its properties. We have confirmed that deposition of primary carbon layer on PDMS, followed by sputtering of silver combined with subsequent heat treatment and activation of such surface with excimer laser, led to the formation of a surface with strong antibacterial properties against two bacterial strains of S. epidermidis and E. coli.

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“…The intensity of the PL peaks found to increase with increase in excitation wavelength and it show maximum intensity at 310 nm with almost 600,000 cps where pure PMMA nanofibers show around 500,000 cps. The intensity of the PMMA nanofibers increases after incorporation of AuNPs since the luminescence nature and Surface Plasmon Resonance (SPR) of AuNPs adds to the transparency of PMMA nanofibers 47 . The increase in excitation wavelength also results in blue shift of the PL peaks due to the changes in luminescence transition of PMMA nanofibers and SPR.…”

Section: Resultsmentioning

confidence: 99%

Structurally modified poly(methyl methacrylate) electrospun nanofibers as better host matrix for noble metal nanoparticles

Philip

Jose

Parameswaran

et al. 2020

J of Applied Polymer Sci

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Poly(methyl methacrylate) (PMMA) nanofibers are proved as good host matrix for various nanomaterials. Here, the possibilities offered by the process of electrospinning are exploited for the production of pure and structurally modified surface roughened and coaxial hollow PMMA electrospun nanofibers with unique advantages and surface characteristics, which is proved through various structural analyses. The host matrix nature of these pure and structurally modified surface roughened and coaxial hollow PMMA nanofibers to gold nanoparticles (AuNPs) are proved through different structural and morphological analyses. The host matrix nature of pure and structurally modified surface roughened and coaxial hollow PMMA nanofibers to AuNPs are compared with that of pure PMMA nanofibers by comparing their structural and optical properties. It is found here that, the surface roughened PMMA nanofibers act as better host matrix with more uniform distribution of particles and intensity enhancement than the pure and coaxial hollow PMMA nanofibers. Pure and coaxial hollow PMMA nanofibers show almost two times enhancement in intensity while the surface roughened PMMA nanofibers show almost five times enhancement in intensity after incorporating AuNPs. The host matrix nature of PMMA nanofibers is thus proved to be improved by making structural modifications on PMMA nanofibers in a simple and cost‐effective way. This makes them more suitable and adaptable in their applications. This superior property of surface roughened PMMA nanofibers over pure PMMA nanofibers can be used in all the application fields of PMMA nanofibers like optical works, catalytically supporting agents, antibacterial supporting systems and so on.

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Studies on the hypsochromic shifted optical properties of gold nanoparticles embedded electrospun poly(methyl methacrylate) (PMMA) nanofibers

Cited by 5 publications

References 17 publications

Structurally modified electrospun poly(methyl methacrylate) nanofibers as advanced host matrices for PbS quantum dots

Structurally modified electrospun poly(methyl methacrylate) nanofibers as advanced host matrices for PbS quantum dots

Antibacterial Properties of Silver Nanoclusters with Carbon Support on Flexible Polymer

Structurally modified poly(methyl methacrylate) electrospun nanofibers as better host matrix for noble metal nanoparticles

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