Porous Polyvinylidene Fluoride Thin-Film Sensors from Colloidal Crystal Templates.

With the development of the materials science, biosensors tend to be thin, flexible, versatile, and are extensively employed in biotechnology, clinical diagnosis, biochips, etc. However, most existing biosensors are single-functionalized and destitute in contrivable microstructure, which result in some inherent limitations. In this work, a novel thin-film sensor that had dual response generated from one stimulus was designed based on the colloidal crystal templates and devisable circuit system. Benefiting from designed platinum coating, the thin-film appeared as a flexible strain sensor which presented corresponding resistance changes with the slight deformation of the thin-film. In addition, with the sacrificial template method, the porous thin-film derived from the colloidal crystal template was endowed with manageable porous structure and splendid structural color, and the resultant color could be various when the environment changed. These features laid the foundation for the construction of multifunctional thin-film biosensor and presented potential applicability for a variety of biological research and flexible sensing devices.