The Ethylhexanoate route to metal oxide nanocrystals : synthesis of CoO nanooctahedra from Co¹¹2-Ethylhexanoate
Epifani, Mauro (Istituto per la Microelettronica e i Microsistemi (Lecce, Itàlia))
Tang, PengYi (Institut Català de Nanociència i Nanotecnologia)
Genç, Aziz (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)
Díaz, Raül (Instituto IMDEA Energía (Móstoles, Madrid))
Wicker, Susanne (Universität Tübingen. Institut für Physikalische und Theoretische Chemie)

Data:	2016
Resum:	CoO nanocrystals were prepared by solvothermal processing of Co 2-ethylhexanoate in oleylamine at 250 °C. The obtained products, identified as CoO by X-ray diffraction, had an octahedral shape, as seen by transmission electron microscopy, reflecting the cubic symmetry of the CoO crystallographic phase. The materials were converted into the CO₃0₄ phase after heat treatment at 400 °C. The nanocrystal evolution was investigated by FTIR spectroscopy. It was concluded that weak oleylamine bonding to the nanocrystal surface during the synthesis step favored the exchange with 2-ethylhexanoato ligands, and that the interplay between the two ligands favored the kinetic control of the growth, resulting in the finally observed octahedral morphology. The CO₃0₄ phase obtained from the heat treatment at 400 °C was used to process chemoresistive sensors, which were able to detect ethanol under dry and humid conditions (0 and 50 % r. h. HO at 25 °C) at low temperatures (100 °C).
Ajuts:	Ministerio de Economía y Competitividad MAT2014-59961-C2-2-R Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-1638
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Cobalt ; Nanoparticles ; Oxide nanocrystals ; Sensors ; Solvothermal processing
Publicat a:	European journal of inorganic chemistry, Vol. 2016, issue 24 (Aug. 2016) , p. 3963-3968, ISSN 1099-0682

DOI: 10.1002/ejic.201600511

Postprint 19 p, 847.7 KB

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