Gupta Anoop, Khalil Ahmed S G, Offer Matthias, Geller Martin, Winterer Markus, Lorke Axel, Wiggers Hartmut
Institute for Combustion and Gasdynamics, University of Duisburg-Essen, Duisburg 47057, Germany.
J Nanosci Nanotechnol. 2011 Jun;11(6):5028-33. doi: 10.1166/jnn.2011.4184.
The formation of stable colloidal dispersions of silicon nanoparticles (Si-NPs) is essential for the manufacturing of silicon based electronic and optoelectronic devices using cost-effective printing technologies. However, the development of Si-NPs based printable electronics has so far been hampered by the lack of long-term stability, low production rate and poor optical properties of Si-NPs ink. In this paper, we synthesized Si-NPs in a gas phase microwave plasma reactor with very high production rate, which were later treated to form a stable colloidal dispersion. These particles can be readily dispersed in a variety of organic solvents and the dispersion is stable for months. The particles show excellent optical properties (quantum yields of about 15%) and long-term photoluminescence (PL) stability. The stable ink containing functionalized Si-NPs was successfully used to print structures on glass substrates by ink-jet printing. The homogeneity and uniformity of large-area printed film was investigated using photoluminescence (PL) mapping.
