ELLIPSOMETRIC SPECTRA OF CONDUCTING POLYANILINE

We report the ellipsometric spectrum studies on a new kind of conducting polymers, polyaniline. In the UV-visible range (1.4-4.8eV photon energy region) the absorption coef-ficient, the complex dielectric function and the refractive index of polyaniline as functions of photon energy are obtained. The spectra of nonconducting and fully conducting polyaniline have been analyzed and discussed. The experimental results show that the emeraldine base form of polyaniline has a large energy gap (E_g～3.6eV) and its absorption spectrum shows a broad exciton absorption peak centered at 2 eV. The absorption spectrum of emeraldine salt after protonation have four absorption peaks centered at 1.5, 1.83, 3.0 and 3.88eV. We also investigated the spectrum evolution of the samples from nonconducting (σ<10^-9Ω^-1·cm^-1) to conducting (σ≈10⁺¹Ω^-1·cm^-1) states, and give the dielectric function and the refractive index of the samples.     

有机聚合物磁铁的获取途经和分子设计

有机导电物质巳在工业上广泛应用,1980年科学家巳合成了有机超导体,1963年,McConell提出了有机磁体的可能性。1968年,Mataga以及1978年Ovchirmikov又从理论上论证了其可能性。尽管科学家们付出了很多的努力,但目前     

有机聚合物 磁铁的获取途径和分子设计

潜在的有机磁铁有三种获取途径:(1)非Kekule型单体的聚合物;(2)高自旋的多碳烯化合物;(3)电荷转移复合物盐.本文将分别对前两种途径的理论模型和潜在的有机磁铁分子结构特点进行讨论,并列出新设计的一些有机的聚物磁铁的分子结构式.