Electrically transmissive alkyne-anchored monolayers on gold



Herrer, Lucia, Gonzalez-Orive, Alejandro, Marques-Gonzalez, Santiago, Martin, Santiago, Nichols, Richard J ORCID: 0000-0002-1446-8275, Luis Serrano, Jose, Low, Paul J and Cea, Pilar
(2019) Electrically transmissive alkyne-anchored monolayers on gold. NANOSCALE, 11 (16). pp. 7976-7985.

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Abstract

Well-ordered, tightly-packed (surface coverage 0.97 × 10-9 mol cm-2) monolayer films of 1,4-bis((4-ethynylphenyl)ethynyl)benzene (1) on gold are prepared via a simple self-assembly process, taking advantage of the ready formation of alkynyl C-Au σ-bonds. Electrochemical measurements using [Ru(NH3)6]3+, [Fe(CN)6]3-, and ferrocenylmethanol [Fe(η5-C5H4CH2OH)(η5-C5H5)] redox probes indicate that the alkynyl C-Au contacted monolayer of 1 presents a relatively low barrier for electron transfer. This contrasts with monolayer films on gold of other oligo(phenylene ethynylene) derivatives of comparable length and surface coverage, but with different contacting groups. Additionally, a low voltage transition (Vtrans = 0.51 V) from direct tunneling (rectangular barrier) to field emission (triangular barrier) is observed. This low transition voltage points to a low tunneling barrier, which is consistent with the facile electron transport observed through the C-Au contacted self-assembled monolayer of 1.

Item Type: Article
Depositing User: Symplectic Admin
Date Deposited: 19 Jul 2019 09:53
Last Modified: 19 Jan 2023 00:37
DOI: 10.1039/c8nr10464f
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3050109