Space-time integration of the near-field-enhanced photochemical reaction View Homepage


Ontology type: schema:MonetaryGrant     


Grant Info

YEARS

2012-2014

FUNDING AMOUNT

6760000 JPY

ABSTRACT

This year, it cited the research results for the light reaction field necessary to cause the near-field light reaction. This time, in this study, was produced model photocatalyst structure using near-field light on a conductive substrate by using surface modified structure gold nanoparticles having a diameter of 36 nm with alkanethiol molecule. It is arranged into an ITO substrate which is a transparent electrode material gold nanoparticles, generating a strong light (near field light) in the vicinity of the gold nanoparticles in the visible light irradiation. The gap between the gold nanoparticles, there is a part where light brightness called strong hot spot, because the same non-linear phenomena and laser light focused occurs, the light excitation that corresponds from two photons of visible light to ultraviolet light It can cause to become. The photoexcitation is possible to activate the titanium dioxide as a photocatalyst, or fixed how close the hot spot and the titanium dioxide photocatalyst is the point of performance improvement. In this study, the surfactant molecules with different binding sites hydrophobic nature and a hydrophilic, in particular by using a TMOS (C8H17Si (OCH3) 3) molecules can be realized an immobilized catalyst. TMOS molecule forms a molecular layer of about 1 nm, the hydrophobic portion is immobilized on the gold nanoparticle surface, a scaffolding hydrophilic moiety is bound titanium dioxide. In this study, by combining the titanium dioxide fine particles of the size of the diameter of 3.5 nm, to form a titanium dioxide thin film layer. It demonstrated the photocatalyst, rather than the homogeneous catalyst used in colloidally dispersed in the solution, since handling is a heterogeneous catalyst 8) used to fix the easy substrate, not waste precious metal. It was examined photocatalytic activity of samples of one square centimeter using a decomposition reaction of staining dye (methylene blue). As a result, the new photocatalyst, found that that the reaction rate during broadband visible light irradiation is close to sunlight is 6.5 times that of titanium dioxide alone know, has excellent properties as a visible light responsive photocatalyst It was. More... »

URL

https://kaken.nii.ac.jp/grant/KAKENHI-PUBLICLY-24106746

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