Site-Selective Deposition and Micropatterning of Visible-Light-Emitting Europium-Doped Yttrium Oxide Thin Film on Self-Assembled Monolayers

Abstract

We have developed a novel process for preparing a micropattern of europium-doped yttrium oxide thin films using a patterned self-assembled monolayer. The thin film was transformed into the crystalline phase by annealing at 800 °C for 1 h. Europium-doped yttrium oxide films showed red emission (611 nm) due to photoluminescence excited by 266 nm. The deposition and micropatterning of visible-lightemitting europium-doped yttrium oxide was successfully realized in an aqueous solution under environmentally friendly conditions.

Morphology Control of Metal Oxide Nanocrystals

“…Reprinted with permission from Ref. 180 185,186 or self-assembled monolayers 20,113,187,188 . However, metal oxide formation on polytetrafluoroethylene (PTFE) was difficult compared to PET films.…”

Nanofabrication of Metal Oxide Patterns Using Self-Assembled Monolayers

“…63 Yttrium carbonate films were also deposited on the hydrophobic octadecyl surface of OTS(octadecyltrichlorosilane)-SAM having water contact angle (WCA) of 116 ° and aspurchased silicon wafer having WCA of about 20-50 ° which was kept in a plastic case in air. On the other hand, the films were not deposited on UV irradiated silicon wafer having WCA < 5 °.…”

“…Especially, 2D patterns of tin oxide nano-structures on flexible polymer films are required for light-weight flexible sensors and solar cells. 2D patterning of nanomaterials 119,120 such as metal oxides 33,54,63,75,121,122 , Au clusters 123 , Pt nanoparticles 124 , organic monolayers 125 , bio molecular layers 126 , DNA 127 , etc. is expected to lead to a large step forward in materials science research and the development of new devices.…”

“…They were based on precise crystal growth control of tin oxide. Additionally, 2D patterning of metal oxides including amorphous tin oxide films 121 was realized with the use of self-assembled monolayers (SAMs) 33,54,63,75,122 . Molecular recognition, organic-inorganic interaction, surface nucleation energy control, static interaction between SAMs and nano-particles, etc.…”

Recent progress in the synthesis of oxide films from liquid solutions

“…An Eu-doped, amorphous yttrium basic carbonate preferentially deposited on amine and methylterminated SAMs and on as-received silicon wafers, but not on a highly hydrophilic UV-treated silicon wafer nor on regions where a SAM had been removed by UV irradiation. 51) Feature sizes as narrow as 10 μ m were reproduced. Heating to 600 or 800°C for 1 h transformed the patterned film to mechanically adherent, single-phase, strongly photoluminescent, Eu-doped Y2O3, a common red phosphor.…”