Characterization of Growth Patterns of Nanoscale Organic Films on Carbon Electrodes by Surface Enhanced Raman Spectroscopy

Analytical Chemistry
Mustafa SupurRichard L McCreery

Abstract

Electrochemical deposition of aromatic organic molecules by reduction of diazonium reagents enables formation of molecular layers with sufficient integrity for use in molecular electronic junctions of interest to microelectronics. Characterization of organic films with thicknesses in the 1-10 nm range is difficult with Raman spectroscopy, since most molecular structures of electronic interest have Raman cross sections which are too small to observe as either thin films on solid electrodes or within intact molecular junctions. Layer formation on a 10 nm thick Ag island film on a flat carbon surface (eC/Ag) permitted acquisition of structural information using surface enhanced Raman spectroscopy (SERS), in many cases for molecules with weak Raman scattering. Raman spectra obtained on eC/Ag surfaces were indistinguishable from those on carbon without Ag present, and the spectra of oligomeric molecular layers were completely consistent with those of the monomers. Layer growth was predominantly linear for cases where such growth was sterically allowed, and linear growth correlated strongly with the line width and splitting of the C═C phenyl ring stretches. Molecular bilayers made by successive reduction of different diazonium reagen...Continue Reading

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Citations

Jul 23, 2019·Physical Chemistry Chemical Physics : PCCP·Colin Van DyckGino A DiLabio
May 21, 2020·Chemical Communications : Chem Comm·Yun LuoClaire Mangeney
Jan 1, 2018·Nanoscale Horizons : the Home for Rapid Reports of Exceptional Significance in Nanoscience and Nanotechnolgy·David D JamesRichard L McCreery
Dec 15, 2020·ACS Sensors·Shailendra K SaxenaRichard L McCreery
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Feb 6, 2018·ACS Applied Materials & Interfaces·Mustafa SupurRichard L McCreery
Jan 4, 2019·ACS Nano·Amin Morteza Najarian, Richard L McCreery
Feb 23, 2019·Analytical Chemistry·Kristen E WattsJeanne E Pemberton
Sep 26, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Maxime PuyoKatia Fajerwerg
Feb 11, 2020·ACS Applied Materials & Interfaces·Anna K FarquharRichard L McCreery

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