- Chemistry, Technical -- Periodicals.
- Grütter, Peter
- Lennox, R. Bruce Burgess, Ian J. Monga, Tanya Godin, Michel Tabard-Cossa, Vincent
- The surface stress response of micromechanical
cantilever-based sensors was studied as a function of the
morphology, adhesion, and cleanliness of the gold sensing surface.
Two model systems were investigated: the adsorption of alkanethiol
self-assembled monolayers at the gas−solid interface and the
potential-controlled adsorption of anions at the liquid−solid
interface. The potential-induced surface stress, on a smooth and
continuous polycrystalline Au(111)-textured microcantilever in 0.1
M HClO4, is in excellent agreement with macroscopic Au(111)
single-crystal electrode results. It is shown that ambient
contaminants on the sensing surface dramatically alter the surface
stress-potential response. This observation can be misinterpreted
as evidence that for polycrystalline Au(111) microcantilever
electrodes, surface stress is dominated by surface energy change.
Results for anions adsorption on gold are in contrast to the
gas-phase model system. We demonstrate that the average grain size
of the gold sensing surface strongly influences the magnitude of
the surface stress change induced by the adsorption of octanethiol.
A 25-fold amplification of the change in surface stress is observed
on increasing the average gold grain size of the sensing surface
from 90 to 500 nm.
- American Chemical Society, 1948-
- Analytical Chemistry Vol. 79, no. 21 (November 2007) pp.
- Published work of the McGill Academic
- All items in eScholarship@McGill are protected by
copyright with all rights reserved unless otherwise
- Instructions in case access is denied
Site powered by: