Abstract
Thickness of 200 nm of NiTPP film is prepared by thermal evaporation technique under vacuum 10−6 torr as a candidate of nano metallo-tetraphenylporphine to study long aging. The prepared films are amorphous in nature while the aged samples were nano-structured with a crystallite size of 19 and 53 nm. An enhancement of crystallinity was seen after 6 months aging, while further aging showed structural stability. SEM micrograph confirms XRD results. Optical gap as well as optical constants and dispersion parameters are calculated; its values are increasing except the dispersion parameters are vice versa. The obtained changes are attributed to the enhancement of ordering because of aging time.
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