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Morales P.,Centro Ricerche della Casaccia | Morales P.,University of Rome Tor Vergata | Rapone B.,Centro Ricerche della Casaccia | Caruso M.,University of Rome Tor Vergata | Flammini D.,University of Rome Tor Vergata
Nanotechnology | Year: 2012

We report on the use of spider fibers as micro- and nanostencils for the fabrication of nanogaps between ultrathin conductive electrodes, and as molds for fabrication of micro- and nanowires by deposition of evaporated gold. Atomic force microscopy (AFM) morphological characterization of the nanogaps is described, together with the measurement of the electrical behavior of both nanogaps and nanowires. Gaps as narrow as 20nm, comparable to e-beam-fabricated gaps, with electrical resistance higher than 10 13Ω have been obtained; while conductive fibers ranging from 350nm to 1.5μm in diameter and resistances ranging from 50MΩ to 100Ω have been obtained and characterized. © 2012 IOP Publishing Ltd. Source


Morales P.,Centro Ricerche della Casaccia | Wang L.,University of Rome Tor Vergata | Krissanaprasit A.,National Research Foundation | Dalmastri C.,Centro Ricerche della Casaccia | And 9 more authors.
Small | Year: 2016

The ability to immobilize DNA origami between groups of four nanodots (NDs) reported here offers a new and unique opportunity to address individual DNA nanoscaffolds. Silicon wafers with a native oxide layer were used as substrates, implying a non-uniform charge distribution on the surface, with a consequent non uniform interaction with the DNA origami. Particular care was taken to choose the optimal dose to obtain very repeatable arrays, with negligible fabrication defects and acceptable size uniformity for dots size above 10 nm. After incubation of the gold NDs in the DNA origami solution, in order to remove buffer salts residues and non-bound materials, the sample is rinsed a few times by fl owing several hundred microliters of ultrapure water onto the surface. The surface is never allowed to dry until a final blow of purified air removes all visible solution. Further removal of adsorbed water is obtained by a gentle flow of purified dry air for several minutes. By self-assembly of organic molecules, bioorganic or other nanoelectronic components at selected locations of their faces, DNA origami may represent an ideal breadboard for development of future nanoelectronic organic devices. Source

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