High surface coverage of a self-assembled monolayer by in situ synthesis of palladium nanodeposits

Lucia Herrer, Victor Sebastian, Santiago Martin, Alejandro Gonzalez-Orive, Francesc Perez-Murano, Paul J. Low, Jose Luis Serrano, Jesus Santamaria, Pilar Cea

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Abstract

Nascent metal| monolayer| metal devices have been fabricated by depositing palladium, produced through a CO-confined growth method, onto a self-assembled monolayer of an amine-terminated oligo(phenylene ethynylene) derivative on a gold bottom electrode. The high surface area coverage (85%) of the organic monolayer by densely packed palladium particles was confirmed by X-ray photoemission spectroscopy (XPS) and atomic force microscopy (AFM). The electrical properties of these nascent Au| monolayer| Pd assemblies were determined from the I-V curves recorded with a conductive-AFM using the Peak Force Tunneling AFM (PF-TUNA (TM)) mode. The I-V curves together with the electrochemical experiments performed rule out the formation of short-circuits due to palladium penetration through the monolayer, suggesting that the palladium deposition strategy is an effective method for the fabrication of molecular junctions without damaging the organic layer.

Original languageEnglish
Pages (from-to)13281-13290
Number of pages10
JournalNanoscale
Volume9
Issue number35
DOIs
Publication statusPublished - 21 Sep 2017

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