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Title: Tuning of noble metal work function with organophosphonate nanolayers

We demonstrate that weak chemical interactions between untethered moieties in molecular nanolayers on metal surfaces can strongly influence the effective work function Φ{sub eff}. Electron spectroscopy shows that nanolayers of mercaptan-anchored organophosphonates on Au and Pt decrease Φ{sub eff}. The measured Φ{sub eff} shifts correlate with the chemical state of phosphonic acid moieties, and scale with molecular length. These results are contrary to predictions of ab initio calculations of monolayer-capped surfaces, but are consistent with calculations of bilayer-capped surfaces with face-to-face hydrogen-bonded phosphonic acid moieties. Our findings indicate that intra-layer bonding and layering in molecular nanolayers can be key to tailoring heterointerfacial electronic properties for applications.
Authors:
; ;  [1] ; ;  [2] ;  [3]
  1. Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180 (United States)
  2. Department of Materials Science and Engineering, University of Connecticut, Storrs, Connecticut 06269 (United States)
  3. Institut Charles Gerhardt Montpellier, UMR 5253 CNRS-IM2-ENSCM-UM1, Université Montpellier 2, CC 1701, Place Eugène Bataillon, 34095 Montpellier Cedex 5 (France)
Publication Date:
OSTI Identifier:
22310939
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 8; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BONDING; CHEMICAL STATE; ELECTRON SPECTROSCOPY; FORECASTING; GOLD; INTERACTIONS; LAYERS; METALS; NANOSTRUCTURES; ORGANIC MATTER; PHOSPHONATES; PLATINUM; RARE EARTHS; SURFACES; TUNING; WORK FUNCTIONS