Travain Silmar A, de Souza Nara C, Balogh Débora T, Giacometti José A
Instituto de Ciências Exatas e Biológicas, Universidade Federal de Ouro Preto, 35400-000, Ouro Preto, MG, Brazil.
J Colloid Interface Sci. 2007 Dec 15;316(2):292-7. doi: 10.1016/j.jcis.2007.08.024. Epub 2007 Aug 17.
Polyaniline (PAni) thin films were deposited onto BK7 glass substrates using the in situ deposition technique. The control of the time and the aniline concentration in the PAni polymerization reaction on the film deposition allowed us to prepare films with different thickness, down to approximately 25 nm. The film growth process was monitored by measuring the UV-vis spectra and the AFM height profiles of the film surface. The curves of adsorption kinetics were analyzed with the Avrami's model, yielding an exponent n=3, thus indicating nucleation of spheroids at the initial stages of polymerization that grow through a diffusion process. AFM images of the surface height profiles corroborate this hypothesis, with spheroids growing with no preferred orientation during the in situ deposition.
采用原位沉积技术将聚苯胺（PAni）薄膜沉积在BK7玻璃基板上。通过控制PAni聚合反应中薄膜沉积的时间和苯胺浓度，我们能够制备出厚度不同的薄膜，最小厚度约为25 nm。通过测量薄膜表面的紫外-可见光谱和原子力显微镜（AFM）高度轮廓来监测薄膜的生长过程。用阿弗拉米模型分析吸附动力学曲线，得到指数n = 3，这表明在聚合初始阶段形成了球状晶核，并通过扩散过程生长。表面高度轮廓的AFM图像证实了这一假设，即在原位沉积过程中，球状晶核无择优取向地生长。
