Templated non-oxide sol-gel preparation of well-ordered macroporous (inverse opal) Ta3N5 films.
Inorg Chem
; 52(17): 9994-9, 2013 Sep 03.
Article
en En
| MEDLINE
| ID: mdl-23947333
ABSTRACT
Reactions of Ta(NMe2)5 and n-propylamine are shown to be an effective system for sol-gel processing of Ta3N5. Ordered macroporous films of Ta3N5 on silica substrates have been prepared by infiltration of such a sol into close-packed sacrificial templates of cross-linked 500 nm polystyrene spheres followed by pyrolysis under ammonia to remove the template and crystallize the Ta3N5. Templates with long-range order were produced by controlled humidity evaporation. Pyrolysis of a sol-infiltrated template at 600 °C removes the polystyrene but does not crystallize Ta3N5, and X-ray diffraction shows nanocrystalline TaN plus amorphous material. Heating at 700 °C crystallizes Ta3N5 while retaining a high degree of pore ordering, whereas at 800 °C porous films with a complete loss of order are obtained.
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Bases de datos:
MEDLINE
Asunto principal:
Tantalio
/
Compuestos de Nitrógeno
Idioma:
En
Revista:
Inorg Chem
Año:
2013
Tipo del documento:
Article
País de afiliación:
Reino Unido