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Highly Luminescent Quantum Dots/Mesoporous TiO2 Nanocomplex Film under Controlled Energy Transfer

Abstract

We have demonstrated a highly luminescent quantum dots (QDs)-TiO2 nanocomplex film by the dip coating method. Because QDs adsorb the ionized Ti+ cation on the TiO2 particle by 3-mercaptopropionic acid as a ligand of QDs, the average distance between the QDs can be changed though controlling porosity in the film. The porosity is controlled using ethyl cellulose (EC). EC is the best material for well dispersing by the hydroxyl functional group (-OH) in the chemical structure, and forming pores inside the film under the decomposition temperature (above 698 oF). As the porosity decreases, the average decay time controlled by the porosity increases to the maximum 91.2 ns. On the other hand, the amount of QDs decreased to 50 %, hindering the increase of Photo-luminescence (PL) intensity. Through this result, we have found that the PL intensity of the QD films is strongly related to the amount of the QDs and the resolution of aggregation. Consequently, we have optimized the porosity of the film and obtained the highly PL intensities up to approximately 17 times.

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Publication details

The article was received on 01 Feb 2019, accepted on 10 Apr 2019 and first published on 11 Apr 2019


Article type: Communication
DOI: 10.1039/C9NR01044K
Citation: Nanoscale, 2019, Accepted Manuscript

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    Highly Luminescent Quantum Dots/Mesoporous TiO2 Nanocomplex Film under Controlled Energy Transfer

    W. Choi, D. Kim, H. Cho, M. Kim and D. Y. Jeon, Nanoscale, 2019, Accepted Manuscript , DOI: 10.1039/C9NR01044K

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