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학술지 Triethylene Glycol-Titanium Oxide Hydrate Hybrid Films with High Refractive Index and Surface Evenness
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박승구, 강병국, 신진욱, 주철웅, 문제현, 조두희, 유병곤, 추혜용, 이정익
Journal of Materials Chemistry C : Materials for Optical and Electronic Devices, v.2 no.22, pp.4468-4475
Royal Society of Chemistry (RSC)
We have evaluated high refractive index organic-inorganic hybrid films fabricated from a solution prepared from triethylene glycol and titanium(iv) butoxide in N,N-dimethyl acetamide (DMAc). The organic-inorganic hybrid solution in DMAc is homogeneous and stable. The solution was spin-coated on a silicon wafer and a glass plate and dried under nitrogen to give a transparent film. The refractive index (n), transparency, and thickness of the hybrid films fabricated from the solution varied as the film drying conditions and feeding mole ratios between the organic and inorganic compounds were varied. The film drying condition was observed to have a strong influence on the surface evenness of the films. The refractive indices of the films were between 1.62 and 2.16 at a wavelength of ca. 600 nm. Scanning electron microscope (SEM) and atomic force microscope (AFM) results showed that the films were very smooth and that the root-mean-square values (Ra) of the surface roughness of the films were between 0.25 and 2.37 nm depending on the film drying conditions. Values for n and Ra of the hybrid film were 2.06 and 0.25 nm, respectively, when it was annealed at 250 °C. The film transparency and thickness increased with decreasing the annealing temperature. We identify our organic-inorganic hybrid solutions as possible good candidate materials for films with high refractive index and surface evenness. © 2014 the Partner Organisations.
KSP 제안 키워드
5 nm, Annealing temperature, Atomic force microscope(AFM), Drying condition, Film drying, Glass plate, N-Dimethyl acetamide, Organic and inorganic compounds, Organic-inorganic hybrid films, Root mean square(RMS), Silicon wafer