MOC染料单分子层薄膜聚集体的吸收光谱研究

用吸收光谱对染料的Langmuir-Blodgett(LB)膜的聚集体在不同条件下进行了研究.典型的染料1-methyl-1’-octadecy1-2,2’-cyaninperchlorate(MOC)LB膜聚集体的吸收峰(J带)在580nm附近,吸收为0.09.刚制备好的样品随时间而改变其吸收特性,表明聚集体的结构在2hr后才趋于稳定;测定了不同样品J带的参数;吸收峰值波长位置和峰的半宽度,以及这些参数随温度的变化.吸收随温度变化的可逆性是LB膜聚集体用作光记录介质的一个物理基础.温度超过100℃时,样品吸收的不可逆变化反映相变发生.

Investigation on absorption spectra of aggregates of MOC dye monolayers

Absorption spectra of aggregates of dye Langmuir-Blodgett films were investigated in different conditions. The typical aggregate of dye MOC (1-methyl-l -octadecyl-2,2 -cyaninpereh-lorate) appears an absorption band (J band) peaking at near 580 nm with absorbanoe of 0.09. The temporal effect of a new sample shows that it takes about 2 hours for the aggregates to be stable. Several parameters of J band of samples were measured, such as absorption peak position, absorbanoe and the width of band, as well as the temperature dependences of their parameters. The inyertibl? variation of the absorbanoe versus temperature in a physioal basic for the aggregate LB layer to "be used in optical storage. When the sample was heated at temperature over 100 ℃ the thermal invertibility of absorption broke down indicating a phase change.