Analysis Onmicro-contact Printing Process

Deformation of elastic stamp and surface free energy of materials directly affects the clarity, consistency and uniformity of the printed lines in Micro-contact printing ink transfer process. Analysis and control these influence factors can improve the micro-contact printing effect, provides simple, efficient, low cost manufacturing methods for microcircuit industry.In this paper, elasticity variational principle of minimum potential energy method of approximate calculation based on the Rayleigh - Ritz method is used to analysis the influencing factors in elastic stress deformation of stamp in theoretical, which include printing pressure bending stiffness, stamp size, and other factors influence bending deformation model of elastic stamp. TiO2 nano-particles mixed with PDMS in different ratios (10:1 proportion of adding cross-linking agents) were used to produce elastic stamp. PDMS with different ratios TiO2 nanoparticles effect on elastic modulus of stamp were researched by tensile test, conclude that add TiO2 nanoparticles can improve the elastic modulus of elastic stamp, which providing simple and effective way to improve elastic modulus of elastic stamp; Through thermal expansion test of TiO2 nanoparticles on PDMS come to conclusion that TiO2 nanoparticles can reduce thermal expansion and improve elastic stamp performance.Theoretical analysis of surface free energy of the materials in ink transfer process, come to achieve the surface free energy condition of elastic stamp, printing inks, solid surface should be met: greater adhesive energy, smaller surface free energy of ink can getting good ink transfer effect and spreading effect. Effects of specific surface energy of thiols on ink transfer efficiency and spreading ratio in ideal practical printing processes were analyzed. Changes of pattern precision and stable time with thiols concentration were studied with experiments. The results showed that reducing thiols concentrate on can reduce specific surface energy, so as to enhance transfer efficiency and spreading effect of ink on substrate surface. The purpose was to provide guidance f r control and improvement of thiols transfer process in practical application.