Qiu Yu, Gao Lian
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P.R. China.
J Phys Chem B. 2005 Oct 27;109(42):19732-40. doi: 10.1021/jp053845b.
We first present the preparation of a new class of polyaniline (PANI)/titanium nitride (TiN) nanocomposites by in situ chemical polymerization in the presence of TiN nanoparticles. It was found that nanocrystalline TiN with an average diameter of approximately 20 nm incorporated and dispersed homogeneously within the polymer matrix, leading to enhanced conductivity and electrochemical activity. The interaction between nanocrystalline TiN and the polymer matrix was characterized by XRD, FTIR, and UV-vis spectra. Interestingly, the morphology and structure of the PANI/TiN were controlled by the content of TiN nanoparticles in the composites. Structural changes are observed at TiN > or = 30 wt %, where the in situ synthesis results in rod-shape composite particles. The electrical and electrochemical properties of the nanocomposites were also affected by the structure. The mechanisms of the property changes with the TiN contents are discussed. The structural difference was used to explain the different activation energies for the conductance process in emeraldine base (EB)/TiN composites.
我们首先介绍了一类新型聚苯胺（PANI）/氮化钛（TiN）纳米复合材料的制备方法，即在TiN纳米颗粒存在下通过原位化学聚合来制备。结果发现，平均直径约为20 nm的纳米晶TiN均匀地掺入并分散在聚合物基质中，从而提高了导电性和电化学活性。通过XRD、FTIR和紫外可见光谱对纳米晶TiN与聚合物基质之间的相互作用进行了表征。有趣的是，PANI/TiN的形态和结构由复合材料中TiN纳米颗粒的含量控制。当TiN≥30 wt%时观察到结构变化，此时原位合成产生棒状复合颗粒。纳米复合材料的电学和电化学性质也受结构影响。讨论了随着TiN含量变化性质改变的机制。利用结构差异解释了翡翠碱（EB）/TiN复合材料中电导过程不同的活化能。
