Abstract
Pulsed-wire evaporation (PWE) was used to synthesize copper nanoparticles having an average diameter of about 100nm. These were coated with 1-octanethiol (CH3(CH2)7SH) under high vacuum (HV) (5.33 © 10 ¹4 Pa) using vapor self-assembled multilayers (SAMs) to prevent oxidation of the nanoparticles. Conductive nanoink made from the coated nanoparticles was printed on glass. The printed patterns were sintered in hydrogen (99.999vol%) and mixed gas (Ar 95vol %+ H2 5vol%) atmospheres; a high copper line density was achieved. Differential scanning calorimetry (DSC) established that the removal temperature of 1-octanethiol was 143°C, well below the 350°C sintering temperature. Complete removal of 1-octanethiol after sintering was confirmed by X-ray photoelectron spectroscopy (XPS). The resistivity of the hydrogensintered copper sample was 1.74 © 10 ¹7 ³·m. This dry powder fabrication and coating method is an alternative approach to inhibit copper oxidation and form inkjet-printed lines. [doi:10.2320/matertrans.M2012137]
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