Investigation of Some Characterizations of Black TiO\(_2\) Nanotubes Via Spectroscopic Methods

Nguyen, Tho Truong; Cao, Thi Minh; Le, Hieu Van; Pham, Viet Van

doi:10.15625/0868-3166/29/2/13762

Cited by 2 publications

(1 citation statement)

References 15 publications

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“…In recent years, nanocomposite materials based on nanoparticles of gold embedded to TiO 2 nanostructure materials have attracted more and more attention of researchers in the world.As we all know that TiO 2 material has been widely used in many fields such as water splitting [1,2], photocatalysts [3][4][5]; solar cells [6][7][8] as well as optoelectronic devices [8,9], etc., because TiO 2 has many advantages: strong photocatalytic activity, chemical stability, environmental sustainability and ease to be fabricated in the form of nanostructures by variety of simple and inexpensive technologies. However, TiO 2 has a large band gap (3.2 eV), so it only absorbs the light in ultraviolet range (about 5% of sunlight energy), that greatly limits its applicability.…”

Section: Introductionmentioning

confidence: 99%

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

Pham

Nguyen

et al. 2021

Comm. in Phys.

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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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