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Kim, Dae Han,Seo, Hyun Ook,Han, Sang Wook,Park, Eun Ji,Jeong, Myung-Geun,Kim, Kwang-Dae,Gantefoer, Gerd,Kim, Young Dok American Chemical Society 2016 The Journal of Physical Chemistry Part C Vol.120 No.36
<P>The oxidation behaviors of poly(3-hexylthiophene-2,5-diyl) (P3HT) thin films (similar to 60 nm thickness)/ZnO irradiated with three different wavelengths of visible light (blue, green, and red) in a humid atmosphere were studied using X-ray photoelectron spectroscopy (XPS) and UV-vis spectroscopy. The formation of sulfoxide states upon visible light irradiation was observed in the S 2p core-level XPS spectra, and more importantly, this oxidation became pronounced with decreasing wavelength of incident light. Photo-oxidation of P3HT films also resulted in a reduction in optical absorption. In contrast to the XPS results, changes in the UV-vis absorption spectrum were rather insensitive to the wavelength of incident visible light. The wavelength dependency of the photo-oxidation of P3HT films seen in the XPS spectra is attributed to the more pronounced photoinduced oxidation of locally disordered thiophene rings on the surfaces of P3HT films under irradiation with shorter-wavelength visible light. The population of local-disordered sites that increases the optical transition gap compared to that of the well-ordered bulk P3HT film decreases from the top surface to the interior of P3HT films due to stronger interchain interactions in the interior portion of the films. Therefore, changes in the optical absorbance seen in the UV-vis absorption spectra of the entire P3HT film upon photoinduced oxidation are less sensitive to the wavelength of incident light in the visible regime.</P>
Size-selected gold clusters on porous titania as the most “gold-efficient” heterogeneous catalysts
Dollinger, Andreas,Stolch, Lukas,Luo, Yuan,Beck, Martin,Strobel, Christoph H.,Hagner, Matthias,Dilger, Stefan,Bein, Malin,Polarz, Sebastian,Gantefoer, Gerd F.,Kim, Young-Dok,Proch, Sebastian The Royal Society of Chemistry 2014 Physical chemistry chemical physics Vol.16 No.22
<P>Research on homogeneous and heterogeneous catalysis is indeed convergent and finds subnanometric particles to be at the heart of catalytically active species. Here, monodisperse gold clusters are deposited from the gas phase onto porous titania generating well-defined model systems and the resulting composite materials exhibit a sharp size-dependency on the number of gold atoms per cluster and exceptionally high-turnovers toward the bromination of 1,4-dimethoxybenzene are observed. This indicates that the deliberate generation of active centres is of utmost importance for the creation of the most “gold-efficient” catalysts.</P> <P>Graphic Abstract</P><P>Size-selected gold clusters on titania present highly efficient solution phase catalysts for bromination with NBS reaching TONs of enzymes. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cp00597j'> </P>