Abstract

The enhanced photoluminescence (PL) effect of a porous alumina film was studied on the interfaces of $\mathrm{CdSe}/\mathrm{Au}/{\mathrm{Al}}_2{\mathrm{O}}_3$ heterojunctions by using gold nanoparticles (NPs). We prepared, respectively, a $\mathrm{CdSe}/{\mathrm{Al}}_2{\mathrm{O}}_3$ heterojunction and a $\mathrm{CdSe}/\mathrm{Au}/{\mathrm{Al}}_2{\mathrm{O}}_3$ heterojunction on the surface of a porous ${\mathrm{Al}}_2{\mathrm{O}}_3$ film by using a colloidal self-assembly method. The results have shown that the positively charged surface of the porous ${\mathrm{Al}}_2{\mathrm{O}}_3$ film can facilitate the aggregation of the CdSe quantum dots (QDs) toward their center to form a cluster, while the porous ${\mathrm{Al}}_2{\mathrm{O}}_3$ surface modified by gold NPs can aggregate and extend the CdSe QDs toward a specific direction to form a nanowire structure via self-assembling. The comparison of the PL spectra of the two heterojunctions reveals that the gold NPs acted as an electron conductor to electrically connect the porous ${\mathrm{Al}}_2{\mathrm{O}}_3$ film and the CdSe QDs and thus enhanced the absorption and fluorescence of the $\mathrm{CdSe}/\mathrm{Au}/{\mathrm{Al}}_2{\mathrm{O}}_3$ heterojunction. It is believed that these results can be widely used in the fields of photovoltaics, photocatalysis, photoelectric detection, and high-precision sensors.

© 2019 Optical Society of America

Enhanced and broadened fluorescence of ZnSe quantum dots enabled by the fluorescence energy transfer system of ZnSe quantum dots and gold nanoparticles

Zhongchen Bai, Man Peng, Zhengping Zhang, and Shuijie Qin
Appl. Opt. 57(28) 8437-8442 (2018)

Surface-enhanced Raman scattering by the composite structure of Ag NP-multilayer Au films separated by Al₂O₃

Zhipeng Zha, Runcheng Liu, Wen Yang, Can Li, Jinjuan Gao, Muhammad Shafi, Xiuwei Fan, Zhen Li, Xuejian Du, and Shouzhen Jiang
Opt. Express 29(6) 8890-8901 (2021)

Strong plasmon enhancement of magneto-optical Kerr rotation in Co–AlO nanogranular films coated with gold nanoparticles

A. F. Kravets, T. I. Borodinova, and V. G. Kravets
J. Opt. Soc. Am. B 33(3) 302-307 (2016)

Tunable optical properties of plasmonic Au/Al₂O₃ nanocomposite thin films analyzed by spectroscopic ellipsometry accounting surface characteristics

Jyoti Jaiswal, Satyendra Mourya, Gaurav Malik, and Ramesh Chandra
J. Opt. Soc. Am. A 35(5) 740-747 (2018)

Enhancement of Er³⁺ upconverted luminescence in Er³⁺: Au-antimony glass dichroic nanocomposites containing hexagonal Au nanoparticles

Tirtha Som and Basudeb Karmakar
J. Opt. Soc. Am. B 26(12) B21-B27 (2009)