Solvothermal Synthesis, Gas-Sensing Properties, and Solar Cell-Aided Investigation of TiO2-MoOx Nanocrystals
Epifani, Mauro (Istituto per la Microelettronica e i Microsistemi)
Kaciulis, Saulius (Istituto per lo Studio dei Materiali Nanostrutturati)
Mezzi, Alessio (Istituto per lo Studio dei Materiali Nanostrutturati)
Altamura, Davide (Istituto di Cristallografia)
Giannini, Cinzia (Istituto di Cristallografia)
Tang, PengYi (Institut Català de Nanociència i Nanotecnologia)
Morante, Joan Ramon (Institut de Recerca en Energia de Catalunya)
Arbiol i Cobos, Jordi (Institut Català de Nanociència i Nanotecnologia)
Siciliano, Pietro (Istituto per la Microelettronica e i Microsistemi)
Comini, Elisabetta (Brescia University & CNR INO)
Concina, Isabella (Luleå University of Technology. Department of Engineering Science and Mathematics)

Data:	2017
Resum:	Titania anatase nanocrystals were prepared by sol-gel/solvothermal synthesis in oleic acid at 250 °C, and modified by co-reaction with Mo chloroalkoxide, aimed at investigating the effects on gas-sensing properties induced by tailored nanocrystals surface modification with ultra-thin layers of MoO species. For the lowest Mo concentration, only anatase nanocrystals were obtained, surface modified by a disordered ultra-thin layer of mainly octahedral Mo oxide species. For larger Mo concentrations, early MoO phase segregation occurred. Upon heat treatment up to 500 °C, the sample with the lowest Mo concentration did not feature any Mo oxide phase segregation, and the surface Mo layer was converted to dense octahedral Mo oxide. At larger Mo concentrations all segregated MoO was converted to MoO. The two different materials typologies, depending on the Mo concentration, were used for processing gas-sensing devices and tested toward acetone and carbon monoxide, which gave a greatly enhanced response, for all Mo concentrations, to acetone (two orders of magnitude) and carbon monoxide with respect to pure TiO. For the lowest Mo concentration, dye-sensitized solar cells were also prepared to investigate the influence of anatase surface modification on the electrical transport properties, which showed that the charge transport mainly occurred in the ultra-thin MoO surface layer.
Ajuts:	Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-1638 Ministerio de Economía y Competitividad MAT2014-59961-C2-2-R Ministerio de Economía y Competitividad SEV-2013-0295
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió sotmesa a revisió
Matèria:	Nanocrystals ; Nanomaterials ; Sensors ; Solar cells ; Surface chemistry
Publicat a:	ChemNanoMat, Vol. 3, Issue 11 (November 2017) , p. 798-807, ISSN 2199-692X

DOI: 10.1002/cnma.201700160

Preprint 23 p, 448.3 KB

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