A Facile Fast Fourier Transforms Method for Characterization of Nanoporous Templates

摘要

High-quality nanoporous templates play an important role in nanomaterials. However, it is difficult to quantitatively evaluate the quality of nanotemplates. In this work, a method based on image processing technology and frequency-domain analysis method is proposed. The geometric parameters of templates including porosity, diameters are extracted. To evaluate the pores ordering, two parameters, the characteristic angle and peak-peak ratio are proposed by combining two-dimensional fast Fourier transforms (2-D FFT) and 1-D fast Fourier transforms techniques. According to the parameters, the lattice type and the pores ordering can be inferred. The accuracy and reliability of present method have been verified by analyzing a standard test image. After that, the quality of some anodic aluminum oxide templates is effectively assessed. The results show this method provides a facile, reliable and comprehensive approach to evaluate the quality of nanoporous templates, which is helpful to optimize the preparation technology and to prepare high-performance functional nanomaterials.