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Nanoparticle arrays patterned by electron-beam writing : Structure, composition, and electrical properties

Plaza, J.L. and Chen, Yu and Jacke, S. and Palmer, R.E. (2005) Nanoparticle arrays patterned by electron-beam writing : Structure, composition, and electrical properties. Langmuir, 21 (4). pp. 1556-1559. ISSN 0743-7463

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Direct electron beam writing in nanoparticle films is employed to create nanoscale wires between prepatterned gold electrodes on SiO2/Si wafers. Characterization of these nanowires using AFM, SEM, and EDX reveals a core/sheath morphology, where a gold-rich core is surrounded by a sheath which is mainly of carbon. Z-contrast STEM images indicate that the central core consists of a distribution of metal cores in a carbon network. The results suggest that the nanoparticle network is created through cross-linking of the ligands of adjacent particles. The high resistivities obtained in conductivity measurements are consistent with this picture. The work illustrates the ability to generate patterned nanoparticle arrays which can be addressed electrically.