Thermal Stability of the Hydrothermally-induced J-band in Merocyanine-containing LB Films

抄録

We have examined the thermal stability of the reorganized J-band induced by the hydrothermal treatment under 100% humidity (HTT) in merocyanine-arachidic acid (MS-C20) mixed Langmuir-Blodgett (LB) films. The reorganized J-band is found to be more stable than the as-deposited J-band: the former remains almost unchanged after DHT at 70C for 75 min in total, and retains 86% of the initial height after dry-heat treatment (DHT) at 90C for 270 min in total, while the latter loses 70% of the initial height after DHT at 90C for 40 min in total. The reorganized J-band is dissociated by DHT at ll0C for 150 min, resulting in a spectrum considerably different from those observed after DHT at tH 90C. The observed thermal behavior is suggested to be closely related to that of the LB lamellar structure in CdC20 LB films stabilized by Cd2+ ions.