Abstract
We investigated changes in the optical properties of indium tin oxide (ITO) nanocrystals as a function of temperature. ITO is a plasmonic, wide bandgap semiconductor capable of absorbing UV and IR radiation. The nanoparticles were made using a standard two-pot synthesis, which resulted in the formation of ITO nanoparticles with myristic acid and oleylamine as surface passivation ligands. Ligand exchange with (6-7% aminopropylmethylsiloxane) dimethylsiloxane-copolymer was allowed dispersion of the particles into a thermal fluid, Duratherm S, which is capable of withstanding working temperatures of 300°C. Nanoparticles suspended in the fluid were heated over a range of temperatures and the properties investigated using IR spectrometry, UV-VIS, TEM, and particle size analysis. Although heating showed no change in particle size, spectral changes were clearly observed in the form of a strong blue shift and increased absorb-ance. These temperature-dependent changes in the spectral properties of ITO were attribu...
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