Plasmonic photocatalysts consisting of a mixture of Au nanospheres and Au nanorods on TiO2 support for improved visible light induced photocatalytic degradation properties

Chansa, Jenny Lumbala; Wewers, Francios; Mthethwa, Thandekile

doi:10.1016/j.jphotochem.2020.112740

Cited by 14 publications

(1 citation statement)

References 31 publications

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“…XRD graph of the AuNSs@mix-TiO 2 sample ( Figure 5 d). The diffraction peaks located at 38.2°, 44.4°, 64.4°, and 78.5°, corresponding to the (111), (200), (220), and (311) crystalline planes of Au [ 38 ], can be clearly observed, which coincide with the crystalline state of Au in the TEM image. In addition, faint diffraction peaks also appear at 27.3°, 56.4°, 58.8°, and 69.7°, and these peak positions correspond to the rutile phase of TiO 2 , also indicating the loading of AuNSs@mix-TiO 2 with a small amount of rutile phase TiO 2 crystals.…”

Section: Resultsmentioning

confidence: 99%

Electric Field Assisted Femtosecond Laser Preparation of Au@TiO2 Composites with Controlled Morphology and Crystallinity for Photocatalytic Degradation

Zuo

Chen

et al. 2021

Materials

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TiO2 is popular in photocatalytic degradation dye pollutants due to its abundance and its stability under photochemical conditions. Au loaded TiO2 can achieve efficient absorption of visible light and deal with the problem of low conversion efficiency for solar energy of TiO2. This work presents a new strategy to prepare Au nanoparticles-loaded TiO2 composites through electric−field−assisted temporally−shaped femtosecond laser liquid-phase ablation of Au3+ and amorphous TiO2. By adjusting the laser pulse delay and electric field parameters, gold nanoparticles with different structures can be obtained, such as nanospheres, nanoclusters, and nanostars (AuNSs). AuNSs can promote the local crystallization of amorphous TiO2 in the preparation process and higher free electron density can also be excited to work together with the mixed crystalline phase, hindering the recombination between carriers and holes to achieve efficient photocatalytic degradation. The methylene blue can be effectively degraded by 86% within 30 min, and much higher than the 10% of Au nanoparticles loaded amorphous TiO2. Moreover, the present study reveals the crystallization process and control methods for preparing nanoparticles by laser liquid ablation, providing a green and effective new method for the preparation of high-efficiency photocatalytic materials.

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Section: Resultsmentioning

confidence: 99%