2012
DOI: 10.1155/2012/361853
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Plasmonic Titania Photocatalysts Active under UV and Visible-Light Irradiation: Influence of Gold Amount, Size, and Shape

Abstract: Plasmonic titania photocatalysts were prepared by titania modification with gold by photodeposition. It was found that for smaller amount of deposited gold (≤0.1 wt%), anatase presence and large surface area were beneficial for efficient hydrogen evolution during methanol dehydrogenation. After testing twelve amounts of deposited gold on large rutile titania, the existence of three optima for 0.5, 2 and >6 wt% of gold was found during acetic acid degradation. Under visible light irradiation, in the case of sma… Show more

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Cited by 62 publications
(56 citation statements)
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“…27°) was not present in any gold loadings. Kowalska et al (2012) reported similar results and explain that this decrease in the intensity could be attributed to the presence of gold nanoparticles with higher sizes and different shapes. Two peaks corresponding to gold at ca.…”
Section: Characterization Of the Au@tio 2 Catalystssupporting
confidence: 56%
“…27°) was not present in any gold loadings. Kowalska et al (2012) reported similar results and explain that this decrease in the intensity could be attributed to the presence of gold nanoparticles with higher sizes and different shapes. Two peaks corresponding to gold at ca.…”
Section: Characterization Of the Au@tio 2 Catalystssupporting
confidence: 56%
“…However, at higher copper loadings, no photogenerated electrons were observed at titania lattice trapping sites. Slamet et al explained this phenomenon as a "shading effect" [87] (also known as "shielding effect" or "inner filter effect" and observed for various titania surface modifications, e.g., with Au NPs [88], and Pt NPs [89]): colored CuO absorbed light and reduced the photoexcitation capacity of TiO2 (competition about photon absorption). Li et al concluded that efficient electron transfer from the CB of TiO2 to CuO led to the absence of Ti 3+ (trapped electrons) in CuO-TiO2 at high CuO loadings.…”
Section: Cuo-tio 2 Heterojunctionmentioning
confidence: 99%
“…surface modifications, e.g., with Au NPs [88], and Pt NPs [89] Moniz et al prepared a CuO/TiO2 (P25) composite using microwave co-precipitation technique [90]. It was found that 5% CuO/P25 exhibited near 1.6 times higher efficiency than pure P25 in mineralization of a model organic pollutant (2,4-dichlorophenoxyacetic acid (herbicide)) under UV/Vis.…”
Section: Cuo-tio 2 Heterojunctionmentioning
confidence: 99%
“…[24][25][26] Although application of noble metals as an electron sink under UV irradiation was started almost 40 years ago, 19 the use of plasmonic properties for photocatalysis under visible light is quite new, 27 which means that opposite results have been published, e.g., on the mechanism [charge transfer (mainly electron, [27][28][29][30][31] but also simultaneous hole transfer has been reported 32 ), energy transfer, [33][34][35] and plasmonic heating [36][37][38] ] and on decisive factors for photocatalytic performance (size and shape of plasmonic NPs and properties of the support). [39][40][41][42][43][44] Despite contrary results, a common conclusion can be drawn, i.e., the morphology of photocatalysts (properties of metallic deposits, semiconductor, and interactions between them) is decisive for both photocatalytic activity and the mechanism. 45 For example, a slight change in morphology of trilayered gold (core)/silver/titania nanorods resulted in a change of the mechanism from electron transfer to energy transfer (with an increase in titania thickness).…”
mentioning
confidence: 99%