Supported silver nanoparticles as photocatalysts under ultraviolet and visible light irradiation

Chen, Xi; Zheng, Zhanfeng; Ke, Xuebin; Jaatinen, Esa; Xie, Tengfeng; Wang, Dejun; Guo, Cheng; Zhao, Jincai; Zhu, Hua

doi:10.1039/b921696k

Cited by 302 publications

(204 citation statements)

References 46 publications

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“…Owing to the unique optical and electronic properties that are not available in either molecules or bulk counterparts, noble metallic nanoparticles (NPs), for example gold NPs (AuNPs), have attracted great interests and found vast applications in a wide range of fields such as solar cells, [1][2] photocatalysis, [3][4] biosensors [5][6] and drug delivery. [7][8] In general, metallic NPs exhibit a surface-enhanced plasmon band as a result of intraband transitions through the photoexcitation of free conduction electrons on their surface.…”

Section: Main Textmentioning

confidence: 99%

Direct Visualization of Photomorphic Reaction Dynamics of Plasmonic Nanoparticles in Liquid by Four-Dimensional Electron Microscopy

Chen

et al. 2018

J. Phys. Chem. Lett.

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Liquid-cell electron microscopy (LC-EM) provides a unique approach for in-situ imaging morphology change of nanocrystals in liquids under electron beam irradiation. However, nanoscale real-time imaging of chemical/physical reaction processes in liquids under optical stimulus is still challenging. Here, we report direct observation of photomorphic reaction dynamics of gold nanoparticles (AuNPs) in water by liquid-cell four-dimensional electron microscopy (4D-EM) with high spatiotemporal resolution. The photoinduced agglomeration, coalescence, and fusion dynamics of AuNPs at different temperatures are studied. At low laser fluences, the AuNPs show a continuous aggregation in several seconds, and the aggregate size decreases with increasing fluence. At higher fluences close to melting threshold of AuNP, the aggregates further coalesced into nanoplates. While at fluences far above the melting threshold, the aggregates fully fuse into bigger NPs, which completes within tens of nanoseconds. This liquid-cell 4D-EM would also permit study of other numerical physical/chemical reaction processes in their native environments. TOC GraphicPage 2 of 28 ACS Paragon Plus EnvironmentThe Journal of Physical Chemistry Letters 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 3 Main TextOwing to the unique optical and electronic properties that are not available in either molecules or bulk counterparts, noble metallic nanoparticles (NPs), for example gold NPs (AuNPs), have attracted great interests and found vast applications in a wide range of fields such as solar cells, [1][2] photocatalysis, 3-4 biosensors [5][6] and drug delivery. [7][8] In general, metallic NPs exhibit a surface-enhanced plasmon band as a result of intraband transitions through the photoexcitation of free conduction electrons on their surface. The surface plasmonic properties (e.g., peak position, width and intensity) of the NPs are determined by their size and shape. 9 It has been widely demonstrated that the morphology and size of the metal colloidal NPs can be significantly modified by light or laser irradiation. Because of subsequent aggregation, coalescence and fusion of NPs, other nanostructures including nanorods, nanobipyramids, nanoprisms and nanodisks can form, where the structures of the products strongly depend on the light wavelength, light intensity and capping ligands. [10][11][12][13][14][15] The control of the morphology and size of the metallic NPs by light not only provides a unique avenue of synthesis but also allows one to modulate their surface plasmon properties in a highly dynamic fashion. 15 In previous studies, however, the prevailing methods for detecting the morphological change of NPs under light irradiation, e.g., time-resolved or static optical scattering and absorption spectroscopies only provided indirect information of the NPs morphology ...

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Section: Main Textmentioning

confidence: 99%

Direct Visualization of Photomorphic Reaction Dynamics of Plasmonic Nanoparticles in Liquid by Four-Dimensional Electron Microscopy

Chen

et al. 2018

J. Phys. Chem. Lett.

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“…The selectivity of the oxidation of the alcohols to corresponding aldehydes photocatalyzed by supported noble metal nanoparticles can be quite high [26,36,37]. For example, the selectivity of the oxidation of benzyl alcohol to benzaldehyde could achieve almost 100% when the process was performed under UV light irradiation with Au nanoparticles supported on zeolite Y (Au/Zeolite Y) as catalyst [26].…”

Section: Selective Photocatalytic Oxidation Of Alcohols To Carbonyl Cmentioning

confidence: 99%

Supported noble metal nanoparticles as photo/sono-catalysts for synthesis of chemicals and degradation of pollutants

Wen

Chen

et al. 2011

Sci. China Chem.

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This review summarizes the utilization of supported noble metal nanoparticles (such as Au/TiO 2 , Au/ZrO 2 , Ag/AgCl) as efficient photo/sono-catalysts for the selective synthesis of chemicals and degradation of environmental pollutants. Supported noble metal nanoparticles could efficiently catalyze the conversion of solar energy into chemical energy. Under UV/visible light irradiation, important chemical transformations such as the oxidation of alcohols to carbonyl compounds, the oxidation of thiol to disulfide, the oxidation of benzene to phenol, and the reduction of nitroaromatic compounds to form aromatic azo compounds, are effectively achieved by supported noble metal nanoparticles. Under ultrasound irradiation, supported noble metal nanoparticles could efficiently catalyze the production of hydrogen from water. Moreover, various pollutants, including aldehydes, alcohols, acids, phenolic compounds, and dyes, can be effectively decomposed over supported noble metal nanoparticles under UV/visible light irradiation. Under ultrasound irradiation, pollutant molecules can also be completely degraded with supported noble metal nanoparticles as catalysts.noble metal nanoparticles, photocatalyst, sonocatalyst

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“…Therefore, the stability is one of the most important factors for their practical applications in nanoscience and nanotechnology. To stabilize Ag NPs, an efficient measure is to immobilize highly dispersed Ag NPs on inexpensive substrates such as SiO 2 , Fe 3 O 3 , ZnO, ZrO 2 , CeO 2 , Al 2 O 3 , C materials and TiO 2 [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]. Particular attention has been focused on supporting and binding AgNPs onto TiO 2 surface to improve catalytic and photocatalytic performance, and antimicrobial activity due to the synergistic interaction between Ag NPs and TiO 2 support [20][21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Modified photodeposition of uniform Ag nanoparticles on TiO2 with superior catalytic and antibacterial activities

Guo

et al. 2015

J Sol-Gel Sci Technol

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Photocatalytic reduction is a facile and effective route to deposit Ag nanoparticles (NPs) on TiO 2 . Nevertheless, it is difficult to produce Ag NPs that have small particle size and uniform distribution on TiO 2 to form core-shell structure TiO 2 @Ag composites by straightforward photodeposition. In this study, monodisperse TiO 2 spheres composed of anatase nanocrystals were directly employed as templates to deposit small and homogeneously dispersed Ag NPs by modified photodeposition procedure. To prove the feasibility of the innovative method, we evaluated the catalytic performance and bactericidal efficacy of the as-prepared samples based on the characterizations, since there is strong dependence between size and dispersion of Ag NPs and catalytic performance and inhibition of bacterial growth, where smaller and more highly dispersed Ag NPs displayed better antimicrobial and catalytic properties. The results indicate that the modified photodeposition route can effectively prevent TiO 2 spheres themselves from aggregating and Ag NPs from rapid overgrowing on the TiO 2 surface in the deposition process. The superior bactericidal and catalytic properties of the TiO 2 @Ag composites are largely attributed to the small and highly dispersed Ag NPs on TiO 2 spheres. Graphical Abstract

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Supported silver nanoparticles as photocatalysts under ultraviolet and visible light irradiation

Cited by 302 publications

References 46 publications

Direct Visualization of Photomorphic Reaction Dynamics of Plasmonic Nanoparticles in Liquid by Four-Dimensional Electron Microscopy

Direct Visualization of Photomorphic Reaction Dynamics of Plasmonic Nanoparticles in Liquid by Four-Dimensional Electron Microscopy

Supported noble metal nanoparticles as photo/sono-catalysts for synthesis of chemicals and degradation of pollutants

Modified photodeposition of uniform Ag nanoparticles on TiO2 with superior catalytic and antibacterial activities

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