Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.12104/43591
Title: Photoluminescence of as-grown and thermal annealed SiOx/Si- nanocrystals heterolayers grown by reactive rf sputtering
Author: Castaneda-Contreras, J.
Maranon-Ruiz, V.F.
Chiu-Zarate, R.
Perez-Ladron De Guevara, H.
Rodriguez, R.
Michel-Uribe, C.
Issue Date: 2012
Abstract: A macro-porous silica film served as mechanical support to immobilize TiO 2 nanoparticles, which were doped with erbium. The films and the nanoparticles were prepared by sol-gel route. The nanoparticles exhibited photocatalytic activity under visible light. We obtained a degradation rate of methylene blue that followed first order kinetics. The sensitization of the nanoparticles to visible light was attributed to a red shift in the band-gap of the TiO 2 due to the addition of erbium ions. " 2011 Elsevier Ltd. All rights reserved.",,,,,,"10.1016/j.materresbull.2011.11.021",,,"http://hdl.handle.net/20.500.12104/43591","http://www.scopus.com/inward/record.url?eid=2-s2.0-84855689908&partnerID=40&md5=197817e694ec77c98d521d5c13da357f",,,,,,"2",,"Materials Research Bulletin",,"290
295",,"47",,"Scopus",,,,,,"A. Thin films; B. Sol-gel chemistry; C. Atomic force microscopy; C. X-ray diffraction; D. Catalytic properties",,,,,,"Photocatalytic activity of erbium-doped TiO 2 nanoparticles immobilized in macro-porous silica films",,"Article" "45378","123456789/35008",,"Mota-Pineda, E., Departamento de Matemáticas, ESIME ZAC IPN, Unidad Adolfo López Mateos, México D.F. 07738, Mexico; Meléndez-Lira, M., Departamento de Física, CINVESTAV-IPN, Apdo. 17-740, México D.F. 07000, Mexico, CICATA-IPN, Unidad Legaria, Legaria 694 Col. Irrigación, Del. Miguel Hidalgo, México D.F. 11500, Mexico; Zapata-Torres, M., CICATA-IPN, Unidad Legaria, Legaria 694 Col. Irrigación, Del. Miguel Hidalgo, México D.F. 11500, Mexico; Del Angel, P., Instituto Mexicano Del Petruleo, Dirección de Investigación y Posgrado, Eje Central L. Cárdenas 152, México D.F. 07730, Mexico; Pérez-Centeno, A., Departamento de Física, CUCEI, Universidad de Guadalajara, Blvd. Marcelino García Barragán # 1421, Guadalajara, Jal. 44430, Mexico; Jiménez-Sandoval, S., CINVESTAV-IPN, Unidad Querétaro, Apartado Postal 1-798, Querétaro, Qro. 76001, Mexico; Santana-Aranda, M.A., Departamento de Física, CUCEI, Universidad de Guadalajara, Blvd. Marcelino García Barragán # 1421, Guadalajara, Jal. 44430, Mexico",,"Mota-Pineda, E.
Melendez-Lira, M.
Zapata-Torres, M.
Del Angel, P.
Perez-Centeno, A.
Jimenez-Sandoval, S.
Santana-Aranda, M.A.",,"2010",,"SiOx/Si -nanocrystals (Si NCs) heterolayers were fabricated employing a rf magnetron sputtering system. The synthesis process, through modification of the oxygen partial pressure of the plasma, promotes the synthesis of stoichiometric SiO2 layers and affect the Si NCs layer giving place to SiOx /Si NCs (1.64<x<2) interfaces. All as-grown samples showed strong photoluminescence (PL) bands in the visible and near-infrared regions; transmission electron microscopy measurements confirmed the presence of Si NCs. Thermal annealing at 1100 °C promoted the SiO 2 stoichiometry in the interface and the crystallization of more Si NCs. The results allow us to clearly identify the origin of the PL bands; indicating that the near-infrared emission is related to the nonstoichiometric oxide while the red and green bands are originated in Si NCs. " 2010 American Institute of Physics.
URI: http://hdl.handle.net/20.500.12104/43599
http://www.scopus.com/inward/record.url?eid=2-s2.0-78649232487&partnerID=40&md5=739766d42349f7301157364db0f9fafe
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