Fabrication of substrate supported bimetallic nanoparticles and their optical characterization through reflection spectra

• Bimetallic nanoparticle has been fabricated by thermal dewetting.
• It's a high throughput fabrication process, with coverage on larger area.
• Reflectance spectra for these fabricated bimetallic nanoparticles have shown an appreciable reduction.
• The refractive index of Bimetallic particles has been calculated as a function of wavelength.
• This has high potential applications in photovoltaic areas.

An approach for the fabrication of bimetallic (Au–Ag) nanoparticle is investigated and its optical response in terms of refection spectra is obtained. A bimetallic film is deposited on a c-Si substrate followed by thermal dewetting at 800 °C for 15 min. Randomly dispersed bimetallic nanoparticles are formed on the substrate. The sequence of deposition of the metallic film is reversed and reflection spectra for all the samples including the bare c-Si is obtained. It is seen that the reflection of the bimetallic nanoparticle dispersed c-Si substrate is less than the bare c-Si for almost all the wavelengths ranging from 300 to 1100 nm due to the localized surface plasmon resonance of the bimetallic nanoparticles.

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