The paper proposes a novel nano-patterning method called electrically induced nanostructuring,where an external electric field,insteadof the external mechanical pressure,is applied to generate an electrohydrodynamic force acting on the polymer-air interface to drive the polymer's flow into the mold cavities. This electrically induced nanostructuring method no longer requires a large mechanical pressure externally applied for actuating the polymer filling in the mold cavities,and has been used to successfully fabricate micro/nano pillar arrays of a high aspect ratio (up to 10),which have been usually considered to be"difficult to fabricate"by conventional molding or nanoimprinting processes.
The low-cost and large area screen-printed nano-diamond film (NDF) for electronic emission was fabricated. The edges and corners of nanocrystalline diamond are natural field-emitters. The nano-diamond paste for screen-printing was fabricated of mixing nano-graphite and other inorganic or organic vehicles. Through enough disperse in isopropyl alcohol by ultrasonic nano-diamond paste was screen-printed on the substrates to form NDF. SEM images showed that the surface morphology of NDF was improved, and the nano-diamond emitters were exposed from NDF through the special thermal-sintering technique and post-treatment process. The field emission characteristics of NDF were measured under -6 all conditions with 10 Pa pressure. The results indicated that the field emission stability and emission uniformity of NDF were improved through hydrogen plasma post-treatment process. The turn-on field decreased from 1.60 V/ μm to 1.25 V/ μm . The screen-printed NDF can be applied to the displays electronic emission cathode for low-cost outdoor in large area.
