Photoinduced dissolution and redeposition of Au nanoparticles supported on TiO2

Kawahara, Tetsuro; Soejima, Tetsuro; Mitsui, Tomohiro; Kiyonaga, Tomokazu; Tada, Hiroaki

doi:10.1016/j.jcis.2005.01.047

Cited by 14 publications

(18 citation statements)

References 23 publications

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“…The reduction of nitrobenzene derivatives has been performed in the presence of Au/TiO 2 at 25 °C. The LSPR excitation‐induced electron transport between small and large Au NPs has been studied by photoelectrochemical measurements, the visualization of redox sites by the CdS photodeposition23 and the photoinduced dissolution and redeposition of Au NPs on TiO 2 24…”

Section: Bm‐au/tio2‐photocatalyzed Reduction Of Nitrobenzenes (Conv=mentioning

confidence: 99%

Visible‐Light‐Induced Electron Transport from Small to Large Nanoparticles in Bimodal Gold Nanoparticle‐Loaded Titanium(IV) Oxide

et al. 2014

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A key to realizing the sustainable society is to develop highly active photocatalysts for selective organic synthesis effectively using sunlight as the energy source. Recently, metal-oxide-supported gold nanoparticles (NPs) have emerged as a new type of visible-light photocatalysts driven by the excitation of localized surface plasmon resonance of Au NPs. Here we show that visible-light irradiation (λ>430 nm) of TiO2 -supported Au NPs with a bimodal size distribution (BM-Au/TiO2 ) gives rise to the long-range (>40 nm) electron transport from about 14 small (ca. 2 nm) Au NPs to one large (ca. 9 nm) Au NP through the conduction band of TiO2 . As a result of the enhancement of charge separation, BM-Au/TiO2 exhibits a high level of visible-light activity for the one-step synthesis of azobenzenes from nitrobenzenes at 25 °C with a yield greater than 95 % and a selectivity greater than 99 %, whereas unimodal Au/TiO2 (UM-Au/TiO2 ) is photocatalytically inactive.

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Section: Bm‐au/tio2‐photocatalyzed Reduction Of Nitrobenzenes (Conv=mentioning

confidence: 99%

Visible‐Light‐Induced Electron Transport from Small to Large Nanoparticles in Bimodal Gold Nanoparticle‐Loaded Titanium(IV) Oxide

et al. 2014

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“…CdS shells are formed on not S-but L-Au NPs. Also, the photoinduced dissolution and redeposition of Au NPs loaded on TiO 2 in aqueous solutions of metal halides [24] can be utilized to specify the electron poor Au NPs (or the oxidation sites). The electrons in both S-and l-Au NPs are pumped up to the CB(TiO 2 ) by the LSPR excitation of Au/TiO 2 , [6,7] and the Fermi energy of the Au NPs lowers.…”

Section: Angewandte Zuschriftenmentioning

confidence: 99%

“…The LSPR excitation-induced electron transport between small and large Au NPs has been studied by photoelectrochemical measurements, the visualization of redox sites by the CdS photodeposition [23] and the photoinduced dissolution and redeposition of Au NPs on TiO 2 . [24] UM-and BM-Au/TiO 2 photocatalysts were prepared as follows. At the first step, large Au NPs were loaded on rutile TiO 2 (L-Au/TiO 2 ) by the deposition-precipitation method.…”

mentioning

confidence: 99%

Visible‐Light‐Induced Electron Transport from Small to Large Nanoparticles in Bimodal Gold Nanoparticle‐Loaded Titanium(IV) Oxide

et al. 2014

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View full text Add to dashboard Cite

A key to realizing the sustainable society is to develop highly active photocatalysts for selective organic synthesis effectively using sunlight as the energy source. Recently, metal-oxide-supported gold nanoparticles (NPs) have emerged as a new type of visible-light photocatalysts driven by the excitation of localized surface plasmon resonance of Au NPs. Here we show that visible-light irradiation (l > 430 nm) of TiO 2 -supported Au NPs with a bimodal size distribution (BM-Au/TiO 2 ) gives rise to the long-range (> 40 nm) electron transport from about 14 small (ca. 2 nm) Au NPs to one large (ca. 9 nm) Au NP through the conduction band of TiO 2 . As a result of the enhancement of charge separation, BM-Au/TiO 2 exhibits a high level of visible-light activity for the one-step synthesis of azobenzenes from nitrobenzenes at 25 8C with a yield greater than 95 % and a selectivity greater than 99 %, whereas unimodal Au/TiO 2 (UM-Au/TiO 2 ) is photocatalytically inactive.

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“…Microcrystalline and nanocrystalline oxide semiconductors can provide the basis for the photocatalytic formation of a wide range of metal-semiconductor nanostructures, such as TiO 2 /Pt 0 , TiO 2 /Pd 0 [119,144,145], TiO 2 /Rh 0 [146], TiO 2 /Au 0 [119,[147][148][149][150][151][152][153][154][155][156][157], TiO 2 /Ag 0 [131,150,155,, TiO 2 /Cu 0 [106,107,[181][182][183][184][185][186][187], TiO 2 /Hg 0 [181], TiO 2 /Ni 0 [188], TiO 2 /Cd 0 [189,190], TiO 2 /Zn 0 , TiO 2 /Mn 0 , TiO 2 /Tl 0 [190], ZnO/Au 0 [148], ZnO/Ag 0 [191,192], ZnO/Cu 0 [109,192,193], ZnO/Pd 0 [194], and ZnO/Pt 0 [126,192,195]. Features of the photoinduced production of metal-semiconductor nanostructures were investigated [196][197]…”

Section: Photocatalytic Formation Of Metal-containing Nanoheterostrucmentioning

confidence: 99%

Photochemical formation of semiconducting nanostructures

et al. 2008

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Existing data on photochemical and photocatalytic approaches to the formation of semiconducting nanoparticles and also binary semiconducting nanostructures and nanocomposites of semiconductors with metals and polymers are reviewed. The nature of the effect of irradiation on the synthesis and properties of the obtained nanostructures and the possibility of photocatalytic control of the structural and spectral parameters of nanostructural semiconducting systems are examined.The accumulation of data on the properties of semiconducting (SC) nanomaterials, which has occurred particularly rapidly in the last 7-10 years, has opened up ever more alluring prospects for their application as light-sensitive and light-emitting components in nanophotonics [1-3], nanophotocatalysis [2,[4][5][6][7], biosensorics [8][9][10][11], and other important fields. The possibility of practical utilization is an important factor that has stimulated the search for and study of the processes involved in the formation of nanomaterials. On this account an enormous number of publications have now accumulated on the improvement of existing and development of new methods for the synthesis of semiconducting nanoparticles and nanostructures (e.g., see the reviews [6, 12-15]). A special position among them is occupied by methods based on photochemical transformations conducted either for the purpose of synthesis and directing it along a desired path or for improving the characteristics of nanostructures produced by other methods.Photochemical methods of synthesis have proved more effective than the production of nanomaterials by traditional synthetic approaches, and in a number of cases only they make it possible to achieve the assigned aim. For this reason the synthesis of semiconducting nanostructures and their modification under the conditions of photoirradiation are constantly attracting the attention of investigators, and the number of publications devoted to these questions is constantly increasing. We note, however, that they nevertheless remain disjointed.In view of the foregoing an attempt is made in the present article to organize existing data, to identify the most important directions for research and development, and thus to assess the current state of development of photochemical approaches to the formation of semiconducting nanostructures. Analysis of data on the photochemical formation and post-synthesis photochemical treatment of semiconducting nanostructures and multicomponent nanocomposites, including the nanoparticles of metals and polymers in addition to semiconductors, showed that in spite of the variety and diversity of the proposed approaches all the papers can be ascribed to only three courses: synthesis, synthesis control, and changing the characteristics of the semiconducting nanostructures. For this reason in this review photochemical approaches to the synthesis of nanoparticles of metal chalcogenides, binary semiconducting nanostructures, and nanocomposites consisting of semiconducting and conducting polymers are examin...

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Photoinduced dissolution and redeposition of Au nanoparticles supported on TiO2

Cited by 14 publications

References 23 publications

Visible‐Light‐Induced Electron Transport from Small to Large Nanoparticles in Bimodal Gold Nanoparticle‐Loaded Titanium(IV) Oxide

Visible‐Light‐Induced Electron Transport from Small to Large Nanoparticles in Bimodal Gold Nanoparticle‐Loaded Titanium(IV) Oxide

Visible‐Light‐Induced Electron Transport from Small to Large Nanoparticles in Bimodal Gold Nanoparticle‐Loaded Titanium(IV) Oxide

Photochemical formation of semiconducting nanostructures

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