C60 Langmuir-Blodgett膜的微结构形态

利用LB(Langmuir-Blodgett)方法组装C60复合膜, 以二十二酸 (BA)、二十酸 (AA)、十八酸 (SA) 和十八胺 (OA) 作为辅助成膜材料, 改变辅助成膜材料的摩尔比, 成功地控制了C60的聚集结构. Dynamic force microscopy(DFM)形貌结果表明由摩尔比nC60∶nSA∶nAA∶nOA=2∶3∶3∶4组成的特定C60组装体具有两种结构: 一种为粒径大约180 nm左右的大颗粒, 另一种结构是粒径大约在30 nm左右的小团簇. 等链长的酸胺混合以及其它比例组成的C60聚集体颗粒大小不均且结构单一. UV-Vis吸收光谱也说明C60分子在LB膜中通过相互作用发生一定程度的聚集.

Microstructure of C60 Langmuir-Blodgett Films

The structure of C60 aggregation was controlled successfully by LB(Langmuir-Blodgett) technique using behenic acid(BA), arachic acid(AA), stearic acid(SA) and octadecanyl amine(OA) as the assistant material. Dynamic force microscopy(DFM) data showed that there were two kinds of structures for the special C60 assembly(molar ratio of nC60∶nSA∶nAA∶nOA=2∶3∶3∶4)∶one’s diameter was about 180 nm; the other was 30 nm. It indicated that the dents on top of the fatty chain in the LB films prevented the further aggregation and controlled the structures of the C60 aggregates. The size of C60 congeries was not uniform for the acid/amine with the same chain length or with other molar ratio, and there was only one kind of structure for these C60 assemblies. UV-Vis absorption spectrum also indicated that the C60 molecules aggregated in some extent in the LB films, which was relevant to the DFM data.