Nanocasted mesoporous nanocrystalline ZnO thin films
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Other documents of the author: Lepoutre, S.; Julian-Lopez, Beatriz; Sánchez, Clément; Amenitsch, Heinz; Linden, M.; Grosso, David
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comunitat-uji-handle2:10234/7053
comunitat-uji-handle3:10234/8639
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http://dx.doi.org/10.1039/b912613a |
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Title
Nanocasted mesoporous nanocrystalline ZnO thin filmsAuthor (s)
Date
2010Publisher
ElsevierISSN
9599428Bibliographic citation
Journal of Materials Chemistry, 20, 3, p. 537-542Type
info:eu-repo/semantics/articleAbstract
For the first time the formation of photoluminescent mesoporous ZnO thin films with high optical quality and low refractive index is reported. They have been thoroughly characterized via the use of a large set of ... [+]
For the first time the formation of photoluminescent mesoporous ZnO thin films with high optical quality and low refractive index is reported. They have been thoroughly characterized via the use of a large set of modern characterisation techniques, GISAXS, HR-TEM, SEM-FEG, EEP and PL among them. These new materials gather the interesting photoluminescent properties of ZnO nanoparticle coatings with the high porosity and surface area of mesoporous network. Thin films were prepared via nanocasting using mesoporous SiO <sub>2</sub> thin film as a template. The process involves impregnation of a ZnCl<sub>2</sub> solution followed by thermally induced polycondensation and nanocrystallisation of ZnO and mild chemical removing of the silica mold. The resulting optically transparent 100 nm thick ZnO films are composed of 10 nm wurtzite photoluminescent nanoparticles, and exhibit low refractive index down to 1.19 (700 nm). Moreover due to a high accessible porosity (about 70%) the mesoporous ZnO films exhibit surface areas of 185 m<sup>2</sup>·cm <sup>-3</sup>, always interesting for catalytic photovoltaic and photonic properties. Indeed, high intensities of the UV and visible emission bands reveals a high amount of oxygen defects combined to small nanoparticles, which are well suited properties for applications as stimulated emitters, sensors, actuators, and lasing cavities. The presented strategy opens new avenues for the synthesis of complex mesoporous nanocrystalline metal oxides processed as optical thin films. © The Royal Society of Chemistry 2010. [-]
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