Abstract:
A versatile layer-by-layer (LbL) procedure for the preparation of highly dispersed, adherent and porous multilayer films of TiO 2 nanoparticles (NPs) and phosphotungstic acid (HPW) on a variety of substrates at room temperature was developed based on the use of cellulose phosphate (CP) as an efficient and non-conventional polyelectrolyte. UV/vis absorption spectroscopy confirmed the linear and regular growth of the films with the number of immersion cycles and a strong adsorption ability of CP towards TiO 2 NPs. FTIR spectroscopy showed that HPW binds to the surface of TiO 2 through the oxygen atom at the corner of the Keggin structure. XPS results showed that the interaction between TiO 2 and CP is through Ti-O-P linkage. A model is proposed for the TiO 2 -HPW interaction based on XPS and FTIR results. FEG/SEM study of the surface morphology revealed a porous film structure with a homogenous distribution of the TiO 2 NPs induced by CP. HRTEM studies showed that the resulting composite films consist of crystalline anatase and rutile phases and poly-nano-crystalline HPW with a semi-crystalline TiO 2 -HPW interface. These CP/TiO 2 and CP/TiO 2 /HPW LbL films showed good photoactivity against both saturated and unsaturated species, for instance, stearic acid (SA), crystal violet (CV) and methylene blue (MB) under UV irradiation. The CP/HPW films formed on bacterial cellulose (BC) showed good photochromic response which is enhanced in presence of TiO 2 due to an interfacial electron transfer from TiO 2 to HPW. This simple and environmentally safe method can be used to form coatings on a variety of surfaces with photoactive TiO 2 and TiO 2 /HPW films. © 2013 Elsevier B.V. All rights reserved.
Registro:
Documento: |
Artículo
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Título: | Photoactive layer-by-layer films of cellulose phosphate and titanium dioxide containing phosphotungstic acid |
Autor: | Ullah, S.; Acuña, J.J.S.; Pasa, A.A.; Bilmes, S.A.; Vela, M.E.; Benitez, G.; Rodrigues-Filho, U.P. |
Filiación: | Instituto de Química de São Carlos, Universidade de São Paulo, PO Box 780, São Carlos, São Paulo 13564-970, Brazil Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo-Andre, Sao Paulo, 09210-170, Brazil Surface and Thin Film Laboratory, Physics Department, Federal University of Santa Catarina, PO Box 476, Florianópolis, SC 88040-900, Brazil Universidad de Buenos Aires, Facultad Ciencias Exactas y Naturales, Instituto de Quimica Fisica de Los Materiales, Medio Ambiente y Energia - INQUIMAE, Ciudad Universitaria, Pab. 2, Buenos Aires C1428EHA, Argentina Laboratorio de Nanoscopías y Fisicoquímica de Superficies, Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), CONICET, diagonal 113 esquina 64. C.C.16.Suc.4, 1900 La Plata, Argentina
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Palabras clave: | Cellulose phosphate; Layer-by-Layer; Photocatalysis; Photochromism; Titania Phosphotungstic acid; Absorption spectroscopy; Aromatic compounds; Boron carbide; Cellulose; Cellulose films; Crystal atomic structure; Crystalline materials; Dyes; Film preparation; Fourier transform infrared spectroscopy; Interfaces (materials); Irradiation; Nanocomposite films; Oxide minerals; Photocatalysis; Photochromism; Polyelectrolytes; Titanium dioxide; X ray photoelectron spectroscopy; Adsorption ability; Bacterial cellulose; Cellulose phosphate; Environmentally safe; Interfacial electron transfer; Layer by layer; Phosphotungstic acid; TiO2 nano-particles; Multilayer films; Aromatic Compounds; Boron Compounds; Catalysts; Cellulose Derivatives; Fourier Analysis; Interfaces; Oxides; Titanium Dioxide |
Año: | 2013
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Volumen: | 277
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Página de inicio: | 111
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Página de fin: | 120
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DOI: |
http://dx.doi.org/10.1016/j.apsusc.2013.04.011 |
Título revista: | Applied Surface Science
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Título revista abreviado: | Appl Surf Sci
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ISSN: | 01694332
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CODEN: | ASUSE
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Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01694332_v277_n_p111_Ullah |
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Citas:
---------- APA ----------
Ullah, S., Acuña, J.J.S., Pasa, A.A., Bilmes, S.A., Vela, M.E., Benitez, G. & Rodrigues-Filho, U.P.
(2013)
. Photoactive layer-by-layer films of cellulose phosphate and titanium dioxide containing phosphotungstic acid. Applied Surface Science, 277, 111-120.
http://dx.doi.org/10.1016/j.apsusc.2013.04.011---------- CHICAGO ----------
Ullah, S., Acuña, J.J.S., Pasa, A.A., Bilmes, S.A., Vela, M.E., Benitez, G., et al.
"Photoactive layer-by-layer films of cellulose phosphate and titanium dioxide containing phosphotungstic acid"
. Applied Surface Science 277
(2013) : 111-120.
http://dx.doi.org/10.1016/j.apsusc.2013.04.011---------- MLA ----------
Ullah, S., Acuña, J.J.S., Pasa, A.A., Bilmes, S.A., Vela, M.E., Benitez, G., et al.
"Photoactive layer-by-layer films of cellulose phosphate and titanium dioxide containing phosphotungstic acid"
. Applied Surface Science, vol. 277, 2013, pp. 111-120.
http://dx.doi.org/10.1016/j.apsusc.2013.04.011---------- VANCOUVER ----------
Ullah, S., Acuña, J.J.S., Pasa, A.A., Bilmes, S.A., Vela, M.E., Benitez, G., et al. Photoactive layer-by-layer films of cellulose phosphate and titanium dioxide containing phosphotungstic acid. Appl Surf Sci. 2013;277:111-120.
http://dx.doi.org/10.1016/j.apsusc.2013.04.011