Abstract
It is the ultimate goal to accurately place molecules and spaces while building electronic devices using individual molecules. In this paper, we attempt to form a metal–insulator–metal (MIM) junction on micrometer-sized plastic beads that can be placed where desired. Electron tunneling in an MIM junction formed from a two-dimensional network consisting of repeated gold nanoparticle (AuNP)–alkyl chain–AuNP sequences is evaluated by directly measuring the electrical resistivity of the microbead. A plot of the logarithm of the resistivity versus the number of carbon atoms in the alkyl chain (nc = 3–8) in each junction yields identical tunneling coefficients, β, of 8.59 ± 0.09 nm−1. The MIM junction on a microbead can be moved and arranged in any location, which enables the rapid development of miniaturized compact electronic devices.
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