Abstract
Nanoparticles of noble metals have unique properties including large surface energies, surface plasmon excitation, quantum confinement effect, and high electron accumulation. Among these nanoparticles, silver (Ag) nanoparticles have strong responses in visible light region due to its high plasmon excitation. These unique properties depend on the size, shape, interparticle separation and surrounded medium of Ag nanoparticles. Indium tin oxide (ITO) is widely used as an electrode for flat panel devices in such as electronic, optoelectronic and sensing applications. Nowadays, Ag nanoparticles were deposited on ITO to improve their optical and electrical properties. Plasma-assisted hot-filament evaporation (PAHFE) technique produced high-density of crystalline Ag nanoparticles with controlling in the size and distribution on ITO surface. In this chapter, we will discuss about the PAHFE technique for the deposition of Ag nanoparticles on ITO and influences of the experimental parameters on the physical and optical properties, and electronic structure of the deposited Ag nanoparticles on ITO.
Highlights
Noble metallic nanoparticles, which are described as metals in the nanoscale with dimensions within size range from 1 to 100 nm, recently received significant attention in optoelectronic, biosensing and photocatalysts applications [1–4]
This is due to their unique properties compared to the bulk materials such as large surface energies, surface plasmon excitation, quantum confinement effect, and high electron accumulation
Ag nanoparticles layer were deposited on indium tin oxide (ITO) substrates via Plasma-assisted hot-filament evaporation (PAHFE) technique at low substrate temperatures less than 200°C
Summary
Noble metallic nanoparticles, which are described as metals in the nanoscale with dimensions within size range from 1 to 100 nm, recently received significant attention in optoelectronic, biosensing and photocatalysts applications [1–4] This is due to their unique properties compared to the bulk materials such as large surface energies, surface plasmon excitation, quantum confinement effect, and high electron accumulation. Ag nanoparticles layer are widely synthesized using evaporation-condensation, electron beam irradiation, and radio frequency plasma-assisted thermal evaporation, which show a good surface adhesion with the dielectric surface [12–14] These physical deposition methods generally involve complicated structures, surface treatments, and high reaction temperatures up to several thousand °C in a plasma jet and 400°C for thermal annealing purposes [13, 15, 16]. Plasma-assisted hot filament evaporation technique is expected to deposition of Ag nanoparticles layer in uniform size and distribution at low substrate temperatures
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