Size Effect of Gold Nanoparticles on Optical and Electrical Properties of Au@TiO\(_2\) Nanocomposite Thin Films

Long Duy Pham, Chi Ha Le, Oanh Thi Tu Nguyen, Chien Tran Dang, Tai Ngoc Ly, Ngan Thi Thanh Nguyen, Dai Nguyen Van, Lien Thi Dao Thach, Hieu Si Nguyen
Author affiliations

Authors

  • Long Duy Pham Institute of Materials Science, Vietnam Academy of Science and Technology
  • Chi Ha Le Institute of Materials Science, Vietnam Academy of Science and Technology
  • Oanh Thi Tu Nguyen Institute of Materials Science, Vietnam Academy of Science and Technology
  • Chien Tran Dang Hanoi University of Natural Resources and Environment
  • Tai Ngoc Ly Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam
  • Ngan Thi Thanh Nguyen Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam.
  • Dai Nguyen Van Hanoi Metropolitan University
  • Lien Thi Dao Thach Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam
  • Hieu Si Nguyen Institute of Materials Science, Vietnam Academy of Science and Technology

DOI:

https://doi.org/10.15625/0868-3166/14662

Keywords:

Gold nanoparticles, Au@TiO2 nanocomposite, Nanostructure, Plasmonic, surface plasmon resonance

Abstract

This study focuses on the influence of gold nanoparticle sizes on optical and electrical properties of Au@TiO2 nanocomposite films. Here, the gold nanoparticles (AuNPs) of different sizes of 5 nm, 10 nm, 20 nm, 40 nm and 60 nm were dispersed onto nanoporous TiO2 thin films to form Au@TiO2 nanocomposite films. FE-SEM images and UV-vis absorption spectra show that AuNPs had good dispersion on the TiO2 films and all Au@TiO2 nanocomposite films exhibited a good surface plasmon resonance (SPR) with the resonance absorption peaks in the visible light region (about 550 nm). The effect of AuNPs on the films photoluminescence property was investigated using excited laser light of 325 nm wavelength at room temperature. The films electrical properties were studied from the change of the photocurrent under illumination of solar simulator and UV light source. The results show that the presence of gold nanoparticles has significantly improved the photocurrent of Au@TiO2 nanocomposite films and especially when AuNPs size was less than 20 nm. In addition, we also found that the photocurrent magnitude of the films with small AuNPs sizes (5 nm and 10 nm) under solar simulator light was 4 times larger than the one under UV light. These results indicate that AuNPs size had a great influence on the improvement of photocurrent in nanocomposite films.

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Published

06-01-2021

How to Cite

[1]
L. D. Pham, “Size Effect of Gold Nanoparticles on Optical and Electrical Properties of Au@TiO\(_2\) Nanocomposite Thin Films”, Comm. Phys., vol. 31, no. 1, p. 103, Jan. 2021.

Issue

Section

Papers
Received 03-12-2019
Accepted 18-10-2020
Published 06-01-2021

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