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Templated non-oxide sol-gel preparation of well-ordered macroporous (inverse opal) Ta3N5 films.

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.

SUBMITTER: Mallinson CF

PROVIDER: S-EPMC3998517 | biostudies-literature | 2013 Sep

REPOSITORIES: biostudies-literature

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Templated non-oxide sol-gel preparation of well-ordered macroporous (inverse opal) Ta3N5 films.

Mallinson Christopher F CF Gray Benjamin M BM Hector Andrew L AL McLachlan Martyn A MA Owen John R JR

Inorganic chemistry 20130815 17

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 tem ...[more]

PMID: 23947333

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