Nanoscale thickness and roughness control of gravure printed MEH-PPV layer by solvent printing for organic light emitting diode.

In this work, a nanoscale thick organic light emitting MEH-PPV (poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene]layer) was realized by gravure printing technology and its roughness was controlled by the solvent printing process. Also, an organic light emitting diode (OLED) was successfully fabricated by the gravure printing of MEH-PPV layers with surface treatments of solvent printing. There is strong demand for high throughput and large area processing technology for the commercialization of OLEDs and the gravure printing process is a good candidate.

Carbon nanotube patterning with capillary micromolding of catalyst.

Patterning of multi-walled carbon nanotube (MWNT) in a plasma enhanced chemical vapor deposition (PECVD) chamber has been achieved by catalyst patterning using capillary micromolding process. Iron acetate catalyst nanoparticles were dissolved in ethanol and mold was fabricated with polydimethylsiloxane (PDMS). The ethanol solution containing catalyst nanoparticles was filled into the microchannel formed between PDMS mold and Si-wafer by capillary force.