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Effect of the origin of ZnO nanoparticles dispersed in polyimide films on their photoluminescence and thermal stability
Author(s) -
Somwangthanaroj Agnat,
Phanthawonge Chuthatai,
Ando Shinji,
Tanthapanichakoon Wiwut
Publication year - 2008
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.28299
Subject(s) - photoluminescence , polyimide , materials science , thermal stability , nanoparticle , zinc , thermal decomposition , saturation (graph theory) , emission intensity , analytical chemistry (journal) , zinc nitrate , diffraction , chemical engineering , phosphor , nanotechnology , chemistry , layer (electronics) , optics , organic chemistry , optoelectronics , metallurgy , physics , mathematics , combinatorics , engineering
Polyimide (PI) films containing dispersed ZnO nanoparticles were prepared from both zinc nitrate hexahydrate (designated as Zn(NO 3 ) 2 /PI) and ZnO nanoparticles, 2‐nm average primary size (ZnO/PI). This work shows how the origin of ZnO affects both the photoluminescence and thermal decomposition of the film. The presence of ZnO derived from Zn(NO 3 ) 2 ·6H 2 O was confirmed by X‐ray diffraction technique. The fluorescent intensities from Zn(NO 3 ) 2 /PI and ZnO/PI were much higher than that from pure PI films. When the ZnO concentration exceeded a certain saturation level, the emission intensity decreased due to the undesirable aggregation of ZnO. At the same concentration, ZnO/PI exhibited higher emission intensity than Zn(NO 3 ) 2 /PI. All samples prepared under nitrogen emitted higher intensity than their counterparts prepared under argon. The ZnO/PI film was thermally more stable than the Zn(NO 3 ) 2 /PI one. From TEM images of 117.6 mol% ZnO/PI films, the ZnO aggregates, whose average size was 17–90 nm, were well distributed throughout the film but poorly dispersed in nanometer range. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008