Vacuum-Free, Maskless Patterning of Ni Electrodes by Laser Reductive Sintering of NiO Nanoparticle Ink and Its Application to Transparent Conductors
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Abstract© 2014 American Chemical Society. We introduce a method for direct patterning of Ni electrodes through selective laser direct writing (LDW) of NiO nanoparticle (NP) ink. High-resolution Ni patterns are generated from NiO NP thin films by a vacuum-free, lithography-free, and solution-processable route. In particular, a continuous wave laser is used for the LDW reductive sintering of the metal oxide under ambient conditions with the aid of reducing agents in the ink solvent. Thin (∼40 nm) Ni electrodes of glossy metallic surfaces with smooth morphology and excellent edge definition can be fabricated. By applying this method, we demonstrate a high transmittance (>87%), electrically conducting panel for a touch screen panel application. The resistivity of the Ni electrode is less than an order of magnitude higher compared to that of the bulk Ni. Mechanical bending test, tape-pull test, and ultrasonic bath test confirm the robust adhesion of the electrodes on glass and polymer substrates.
CitationLee D, Paeng D, Park HK, Grigoropoulos CP (2014) Vacuum-Free, Maskless Patterning of Ni Electrodes by Laser Reductive Sintering of NiO Nanoparticle Ink and Its Application to Transparent Conductors. ACS Nano 8: 9807–9814. Available: http://dx.doi.org/10.1021/nn503383z.
SponsorsPartial support to the Laser Thermal Laboratory by the King Abdullah University of Science and Technology (KAUST) is acknowledged. Laser Prismatics LLC was supported by the SBIR Phase I Grant No. 1346088 from the U.S. National Science Foundation. D.L. was supported by Gachon University research fund of 2014(GCU-2014-0107). The authors also would like to thank Dr. Frances I. Allen (Lawrence Berkeley National Lab) for assistance in recording TEM images.
PublisherAmerican Chemical Society (ACS)
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