Carlos Sanchez - Academia.edu (original) (raw)
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National Council of Scientific and Technological Research (CONICET)
UPAEP - Universidad Popular Autónoma del Estado de Puebla
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Papers by Carlos Sanchez
Resumen III zona ocupada del gap. Una es debida a los defectos del volumen (principalmente vacant... more Resumen III zona ocupada del gap. Una es debida a los defectos del volumen (principalmente vacantes de oxígeno) y la otra a la reconstrucción superficial. Finalmente, hemos estudiado los primero estadios del crecimiento de platino sobre esta superficie. Hemos observado la formación de clusters de Pt situados encima de la filas Ti 2 O 3 de la reconstrucción (1x2). El calentamiento del sistema produce una aglomeración de material, con una nucleación preferente en los single y cross-links de la superficie.
Journal of the American Chemical Society, Jan 24, 2015
Graphene nanoribbons (GNRs), defined as nanometer-wide strips of graphene, have attracted increas... more Graphene nanoribbons (GNRs), defined as nanometer-wide strips of graphene, have attracted increasing attention as promising candidates for next-generation semiconductors. Here, we demonstrate a bottom-up strategy toward novel low band gap GNRs (Eg=1.70 eV) with a well-defined cove-type periphery both in solution and on a solid substrate surface with chrysene as the key monomer. Corresponding cyclized chrysene-based oligomers consisting of the dimer and tetramer are obtained via an Ullmann coupling followed by oxidative intramolecular cyclodehydrogenation in solution, and much higher GNR homologues via on-surface synthesis. These oligomers adopt non-planar structures due to the steric repulsion between the two C-H bonds at the inner cove position. Characterizations by single crystal X-ray analysis, UV-vis absorption spectroscopy, NMR spectroscopy, and scanning tunneling microscopy (STM) are described. The interpretation is assisted by density functional theory (DFT) calculations.
American Journal of Roentgenology, 2006
... Case Report. Extraforaminal Meningioma with Extrapleural Space Extension. Carlos S. Restrepo ... more ... Case Report. Extraforaminal Meningioma with Extrapleural Space Extension. Carlos S. Restrepo 1 , Diego A. Herrera 2 and Julio A. Lemos 3 1 Department of Radiology, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Dr., Bldg. HSC-MED, Rm. ...
Resumen III zona ocupada del gap. Una es debida a los defectos del volumen (principalmente vacant... more Resumen III zona ocupada del gap. Una es debida a los defectos del volumen (principalmente vacantes de oxígeno) y la otra a la reconstrucción superficial. Finalmente, hemos estudiado los primero estadios del crecimiento de platino sobre esta superficie. Hemos observado la formación de clusters de Pt situados encima de la filas Ti 2 O 3 de la reconstrucción (1x2). El calentamiento del sistema produce una aglomeración de material, con una nucleación preferente en los single y cross-links de la superficie.
Journal of the American Chemical Society, Jan 24, 2015
Graphene nanoribbons (GNRs), defined as nanometer-wide strips of graphene, have attracted increas... more Graphene nanoribbons (GNRs), defined as nanometer-wide strips of graphene, have attracted increasing attention as promising candidates for next-generation semiconductors. Here, we demonstrate a bottom-up strategy toward novel low band gap GNRs (Eg=1.70 eV) with a well-defined cove-type periphery both in solution and on a solid substrate surface with chrysene as the key monomer. Corresponding cyclized chrysene-based oligomers consisting of the dimer and tetramer are obtained via an Ullmann coupling followed by oxidative intramolecular cyclodehydrogenation in solution, and much higher GNR homologues via on-surface synthesis. These oligomers adopt non-planar structures due to the steric repulsion between the two C-H bonds at the inner cove position. Characterizations by single crystal X-ray analysis, UV-vis absorption spectroscopy, NMR spectroscopy, and scanning tunneling microscopy (STM) are described. The interpretation is assisted by density functional theory (DFT) calculations.
American Journal of Roentgenology, 2006
... Case Report. Extraforaminal Meningioma with Extrapleural Space Extension. Carlos S. Restrepo ... more ... Case Report. Extraforaminal Meningioma with Extrapleural Space Extension. Carlos S. Restrepo 1 , Diego A. Herrera 2 and Julio A. Lemos 3 1 Department of Radiology, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Dr., Bldg. HSC-MED, Rm. ...