Fabrication Of Two-dimensional Ordered Microarray Of Functional Materials And Study Of Their Optical Properties

The schemes of positioning functional materials in predetermined microscopic areas are of great scientific and technological interest. The capibility of design and construction of highly ordered microarrays from various functional materials is required for future device miniaturization. Microarrays can be used in a wide range of applications, such as electronics, optoelectronics, and bio-sensing. This thesis focuses on the fabrication of micro pattern on different surfaces, and study on their optical properties. The main results of this thesis are summarized as below:1. Patterned protein microarrays were fabricated on modified SiO2substrates using microcontact printing. High spatial resolution and large area thickness mapping of label-free protein microarray has been achieved using imaging ellipsometry (IE) under optimized conditions. Ellipsometry is an optical technique to measure the polarization states before and after reflection from the sample, which is nondestructive and self-referencing. Quantitative thickness analysis of antibody-antigen binding on the32×32μm2micron spots was successfully performed, and we have obtained a limit of detection as low as1.2pg/spot.2. Combined by microcontact printing and water droplet templates, after two surface-directed patterning processes, ordered assembly of functional organic molecules and nanocrystals can be achieved. We have successfully fabricated OPV/CdTe NCs multi-color fluorescence array, and obtained highly uniform square-in-ring binary pattern. We first demonstrated the fabrication of a hierarchical pattern consisting of both inert and chemically reactive molecules. This hierarchical organic array can be used as a fast response and self-referenced solid device for sensing acid and base vapors.3. Two-dimentional nanosheets of MoS2have attracted much attention in recent years due to their unique structure and properties. We have developed a facile method for exfoliation and dispersion of MoS2in low boiling organic solvents. This method is based on the asistent of P3HT, a polymer materisl commonly used in organic electronics. The MoS2/P3HT hybrid material exhibits strong fluorescence quenching phenonomon and reduced fluorescence lifetimes compared to that of P3HT, indicating strong electronic interaction. A superior optical limiting effect in P3HT-MoS2is observed for the first time, which is even higher than the benchmark material C60.