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Obregó,n, Sergio,Lee, Soo W.,Coló,n, Gerardo The Royal Society of Chemistry 2014 Dalton Transactions Vol.43 No.1
<P>Er-doped BiVO<SUB>4</SUB> are synthesized by means of a surfactant free microwave assisted hydrothermal method having good photoactivities under sun-like excitation for the degradation of methylene blue. From the structural and morphological characterization, it has been stated that the presence of Er<SUP>3+</SUP> induces a slight stabilization of the tetragonal phase, probably due to its incorporation in the BiVO<SUB>4</SUB> lattice. The best photocatalytic performances were attained for the samples with Er<SUP>3+</SUP> content higher than 3 at%. The occurrence of the Er<SUP>3+</SUP> doped tetragonal BiVO<SUB>4</SUB> clearly induces higher photocatalytic activities. The existence of a luminescence process has been related with the enhanced photoactivity observed.</P> <P>Graphic Abstract</P><P>Er<SUP>3+</SUP> doped t-BiVO<SUB>4</SUB> photocatalysts have been prepared by a microwave assisted hydrothermal method having improved solar-like photocatalytic activity. A cooperative mechanism is proposed in which the photocatalyst would efficiently exploit the wide range of the visible irradiation. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3dt51923f'> </P>
Weak screening of a large dipolar molecule adsorbed on graphene
Kong, Lingmei,Perez Medina, G.J.,Coló,n Santana, J.A.,Wong, F.,Bonilla, M.,Coló,n Amill, D.A.,Rosa, L.G.,Routaboul, L.,Braunstein, P.,Doudin, B.,Lee, Chang-Mook,Choi, Jaewu,Xiao, Jie,Dowbe Elsevier 2012 Carbon Vol.50 No.5
<P><B>Abstract</B></P><P>We compare the electronic structure of a quinonoid zwitterionic type molecule adsorbed on both gold and graphene on copper substrates. This (6<I>Z</I>)-4-(butylamino)-6-(butyliminio)-3-oxocyclohexa-1,4-dien-1-olate, C<SUB>6</SUB>H<SUB>2</SUB>(⋯_NHR)<SUB>2</SUB>(⋯_O)<SUB>2</SUB> where R=<I>n-</I>C<SUB>4</SUB>H<SUB>9</SUB>, film is made of small molecules with a large intrinsic dipole of 10Debyes. We find that the photoemission and inverse photoemission final states are well screened for these dipolar molecules on gold. This is not observed when they are adsorbed on graphene on copper. This weaker screening results in a larger highest occupied molecular orbital to lowest unoccupied molecular orbital gap for the molecules on graphene.</P>