以乙二胺为分子绳索的C_(60)自组装单层膜和双层膜的激光质谱研究

Laser MS Study of Self assembled Mono and Dilayer Film of C 60 with Ethylene Diamine as Intermolecular String

富勒烯的固体薄膜一般分为气相沉积膜、液相沉积膜、ＬＢ（ＬａｎｇｍｕｉｒＢｌｏｄｇｅｔｔ）膜和化学自组装膜．化学自组装膜是通过特定的化学反应，将富勒烯通过化学键固定于基片上而形成的膜．对于纯富勒烯的气相沉积膜，我们进行过详细的激光质谱分析［１］．本文使...

Self assembled film of C 60 with ethylene diamine as intermolecular string were analyzed by the method of laser time of flight mass spectrometry. Similar mass spectra were found for self assembled monolayer film of C 60 on glass or silicon surface. For the glass film, the highest ion was C + 112 , while for silicon film was C + 102 . When n >32, the fragmentation of C n showed the lost of two carbon atoms each time. And the adduct(C 60 + ethylene diamine) wasnt found in the spectra. It was assumed that at such a condition only C 60 and its dimer are desorbed. The reason was that the bond between ethylene diamine and the surface of glass or silicon were stronger than that between ethylene diamine and C 60 . The spectra of self assembled dilayer film of C 60 was different from that of monolayer film. In the spectra of dilayer film, when m/z <600, few peaks were found; when 600< m/z <720, the spectra had the characteristic fragmentary spectra of pure C 60 ; when m/z >720, there was a broad peak. The above results demonstrated that laser MS can provide useful structural information in the study of fullerene film.