Abstract
Hydrothermal and dry-heat treatments (HTT and DHT, respectively) in the morocyanine-containing LB films are studied in relation to the ‘mild’ heat treatment, which leads to two different consequences in the spectral change. Close resemblance is found between the HTT-type and the HTT spectra associated with a sharp J-band peak, and also between DHT -type spectra and the DHT ones with a broad band. It is suggested that the underlying processes of the HTT -type and the DHT -type are essentially identical with those of the HTT and the DHT, respectively. The seasonoodependent occurrence of the both types after the ‘mild’ HT suggests that the humid and cool weather leads to the high yield of the HTT -type spectra. The water remaining on the sample is presumably assumed to act as a humidifier to supply the sufficient amount of water for inducing the HTT -type spectral changes.
