SPECTROSCOPIC STUDIES ON <font>Ag</font>/PVA NANOCOMPOSITE THIN FILMS PREPARED BY THERMAL ANNEALING PROCESS

Saikia, Rajib; Gogoi, P. K.; Barua, Pranabesh; Datta, Pranayee

doi:10.1142/s0219581x11008174

Cited by 2 publications

(3 citation statements)

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“…Metallic nanoparticles (NPs) are widely used in diverse applications, thanks to their surface plasmon resonance (SPR), i.e., the collective oscillation of free electrons in resonance with the incident light, for example, in photocatalysis [ 1 , 2 ], sensing [ 3 , 4 , 5 ], optical data storage [ 6 , 7 , 8 ], or medicine [ 9 , 10 ]. Many applications require the incorporation of these plasmonic NPs into different materials, especially polymers, to form the so-called plasmonic nanocomposites [ 11 , 12 , 13 , 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

“…To solve this problem, direct synthesis methods of NPs inside polymer matrix have been proposed. Different methods are investigated, such as chemical methods [ 21 , 22 ], and physical methods such as thermal treatment [ 13 , 14 , 23 ] and ultraviolet (UV) illumination [ 12 , 24 ]. The direct synthesis method thus allows to separate the polymer-shaping process from the control of NPs dispersion inside the medium [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

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Direct Synthesis of Gold Nanoparticles in Polymer Matrix

et al. 2022

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We report an original method for directly fabricating gold nanoparticles (Au NPs) in a polymer matrix using a thermal treatment technique and theoretically and experimentally investigate their plasmonic properties. The polymeric-metallic nanocomposite samples were first prepared by simply mixing SU-8 resist and Au salt with different concentrations. The Au NPs growth was triggered inside the polymer through a thermal process on a hot plate and in air environment. The Au NPs creation was confirmed by the color of the nanocomposite thin films and by absorption spectra measurements. The Au NPs sizes and distributions were confirmed by transmission electron microscope measurements. It was found that the concentrations of Au salt and the annealing temperatures and durations are all crucial for tuning the Au NPs sizes and distributions, and, thus, their optical properties. We also propose a simulation model for calculations of Au NPs plasmonic properties inside a polymer medium. We realized that Au NPs having large sizes (50 to 100 nm) play an important role in absorption spectra measurements, as compared to the contribution of small NPs (<20 nm), even if the relative amount of big Au NPs is small. This simple, low-cost, and highly reproducible technique allows us to obtain plasmonic NPs within polymer thin films on a large scale, which can be potentially applied to many fields.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Direct Synthesis of Gold Nanoparticles in Polymer Matrix

et al. 2022

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“…This allows for separating the polymer-shaping process from the control of nanoparticle dispersion inside the matrix. In this type of approach, the metal salt reduction and the nanoparticle formation can be triggered by several means such as chemical treatment [29][30][31] , annealing of the films [31][32][33][34] or UV irradiation [35][36][37] . So far, this approach has proven its efficiency for producing homogeneous gold 32,35 and silver 29,38,39 nanocomposite films with high filling fractions, but a systematic control of the nanoparticle size and shape is still challenging.…”

Section: Introductionmentioning

confidence: 99%