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Light-assisted surface reactions on metal nanoparticles
Kim, Chanyeon,Lee, Hyunjoo The Royal Society of Chemistry 2018 Catalysis science & technology Vol.8 No.15
<P>Surface catalytic reactions typically occur on metal nanoparticles deposited on inert supports with high surface area. Recently, many studies have reported that the catalytic activity of metal nanoparticles can be enhanced significantly under light irradiation. This ‘light-assisted surface reaction’ can lower reaction temperature, potentially reducing the energy use. Light can be absorbed <I>via</I> intra- or inter-band transition within metal nanoparticles or direct photoexcitation of adsorbates on the surface. The absorbed energy can be relaxed through a radiative or non-radiative process; the non-radiative relaxation can produce heat or energetic electrons, enhancing the surface catalytic reaction with lower activation energy. The enhancement depends on the light intensity or wavelength. Plasmonic metals Au, Ag, and Cu have been widely studied for the ‘light-assisted surface reaction’, but composites of plasmonic metals with semiconductors or other metals such as Pt, Pd, or Ni have also been used for the surface reaction. Most recently, non-plasmonic metal Pt has shown an enhancement upon light irradiation due to the photoexcitation of electrons in the orbitals of adsorbates. The light-assisted surface reaction is still in the infancy stage, but it would surely provide more facile ways to control surface reactions and minimize the overall energy use.</P>
Shaped Ni nanoparticles with an unconventional hcp crystalline structure
Kim, Chanyeon,Kim, Cheonghee,Lee, Kangtaek,Lee, Hyunjoo The Royal Society of Chemistry 2014 Chemical communications Vol.50 No.48
<P>Hourglass-shaped Ni nanoparticles were synthesized with a hexagonal close packed (hcp) structure. The unconventional crystalline structure could be stabilized by intensive utilization of hexadecylamine. The dense organic layer on the surface protected the meta-stable crystalline structure.</P> <P>Graphic Abstract</P><P>An unconventional hexagonal close packed crystalline structure could be stabilized by intensive utilization of hexadecylamine with a unique hourglass shape for Ni nanoparticles. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cc02528h'> </P>
Shape effect of Ag–Ni binary nanoparticles on catalytic hydrogenation aided by surface plasmons
Kim, Chanyeon,Kwon, Yongwoo,Lee, Hyunjoo The Royal Society of Chemistry 2015 Chemical communications Vol.51 No.61
<P>Ag-Ni binary nanoparticles with different shapes (snowman and core-shell) were synthesized by modulating the lattice strain. In the catalytic hydrogenation of 4-nitrophenol, a significant enhancement of the reaction rate was observed for the snowman shape in comparison with the core-shell shape under light irradiation.</P>