Fabrication Of Pattern With Inkjet Printing And Its Applications

In the modern scientific and technological research, the photonic crystal was a novel material with enormous and potential application in the fields of optical, electrical and others, due to its excellent regulatory capacity to the photon. Patterned photonic crystals have furtherly gained other special features because of their special micro-structures, and greatly expanded their application in display, bio-sensing and detection, tissue engineering and other fields. The current patterning methods such as optical lithography, mask replication and etch, were not suitable for the preparation of large-area photonic crystal pattern owing to their cumbersome process, expensive cost and other shortcomings. Therefore, we hope to develop an efficient and simple technology to fabricate the photonic crystal patterns, and explore their specific applications. By combining the inkjet-printing technology and self-assembly of colloidal particles, we successfully prepared the diversified colloidal photonic crystal pattern with high-precision and explored its application in display and information security. The detail works are as follows:(1) By researching and controlling the parameter settings of JetlabⅡ piezoelectric inkjet-printing system, ink component, substrate wettability and environmental conditions, the conditions for preparing a high-precision high-quality self-assembled colloidal crystal domes were explored and optimized. With the optimized conditions, the colloidal crystal pattern composed of dome matrix with excellent optical property was successfully fabricated.(2) We explored the possibility of using the electrohydrodynamic inkjet printing system to prepare the continuous colloidal crystals pattern. By regulating the component of the ink solvent, the pattern formed by colloidal crystal lines with good optical property was successfully prepared. The factors such as nozzle diameter, the increasing speed of ink, platform velocity and others, were optimized to obtain a smaller scale of the pattern.(3) Base on piezoelectric inkjet-printing technology, we provided a facile, fast, large scale and versatile method for fabrication of colloidal crystal patterns with multiple optical variable properties on diversified substrate. By controlling the wettability of the substrate, the morphologies of the colloidal crystal domes can be flexibly controlled, thus, they show discrepant angle dependent color shifts. The patterns with multiple responsive optical properties presented here were of great potential for anti-counterfeiting applications.