In-Situ Investigation of Binary-Component Self-Assembled Monolayers:  A SERS-Based Spectroelectrochemical Study of the Effects of Monolayer Composition on Interfacial Structure

Oklejas, Vanessa; Harris, Joel M.

doi:10.1021/la020916e

In-Situ Investigation of Binary-Component Self-Assembled Monolayers: A SERS-Based Spectroelectrochemical Study of the Effects of Monolayer Composition on Interfacial Structure

Journal Article · Thu Jun 12 00:00:00 EDT 2003 · Langmuir

DOI:https://doi.org/10.1021/la020916e· OSTI ID:2480865

Oklejas, Vanessa ^[1]; Harris, Joel M. ^[1]

University of Utah, Salt Lake City, UT (United States)

SERS-based spectroelectrochemistry was used to investigate interfacial structural properties of mixed self-assembled monolayers (SAMs) as a function of their composition. Mixed monolayers were formed from ethanolic solutions containing 12-mercaptododecanenitrile and n-heptanethiol. The ratio of the two-component concentrations in solutions from which the SAMs were assembled was varied to provide a series of SAMs with varying surface concentrations of the terminal nitrile group. The intensities of Raman scattering from vibrational modes associated with the nitrile and methyl termini were used to determine the relative composition of the mixed monolayer versus component concentrations in the assembly solutions. Stark tuning of the nitrile group served as a localized probe of the interfacial environment. Stark tuning rates of the nitrile probe molecule exhibited a dependence on monolayer composition comprising two distinct regions: Stark tuning rates at high nitrile surface coverages were large and did not exhibit significant composition dependence, while Stark tuning at low nitrile coverage was weaker and varied with SAM composition. Furthermore, Raman scattering obtained in the C–H stretching spectral region is modeled using ab initio electronic structure calculations and used to determine conformational order within the SAM as a function of applied potential.

View Accepted Manuscript (DOE)

Research Organization:: University of Utah, Salt Lake City, UT (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)

Grant/Contract Number:: FG03-93ER14333

OSTI ID:: 2480865

Journal Information:: Langmuir, Journal Name: Langmuir Journal Issue: 14 Vol. 19; ISSN 0743-7463

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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