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Surface Stress Generation During Formation of Alkanethiol Self-assembled Monolayer (SAM)

Published online by Cambridge University Press:  01 February 2011

Kanaga Karuppiah Kanaga Subramanian ,
Ruqin Zhang ,
Pranav Shrotriya ,
Abhijit Chandra  and
Sriram Sundararajan
Kanaga Karuppiah Kanaga Subramanian
Affiliation:
[email protected], Iowa State University, Mechanical Engineering, 0087 Black Engineering Building, Mechanical Engineering Department, Iowa State University, Ames, IA, 50011, United States, 515-294-8020, 515-294-3261
Ruqin Zhang
Affiliation:
[email protected], Iowa State University, Mechanical Engineering, Ames, IA, 50011, United States
Pranav Shrotriya
Affiliation:
[email protected], Iowa State University, Mechanical Engineering, Ames, IA, 50011, United States
Abhijit Chandra
Affiliation:
[email protected], Iowa State University, Mechanical Engineering, Ames, IA, 50011, United States
Sriram Sundararajan
Affiliation:
[email protected], Iowa State University, Mechanical Engineering, Ames, IA, 50011, United States
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Abstract

Micro-machined cantilevers coated with self-assembled monolayers (SAM) of alkanethiols are being utilized as sensing elements for new generation of high-sensitivity chemical and biological sensors. Presence of chemical species is detected by resolving the surface stress change associated with absorption/adsorption of analyte molecules on the sensitized cantilever. Challenges to widespread use of micromechanical cantilever sensors are: susceptibility to vibrations, integration in a single device and understanding the mechanism governing surface stress generation. In the current work, surface stress development associated with formation of self-assembled-monolayers of alkanethiols was characterized using curvature interferometry. In order to understand the molecular mechanism underlying the surface stress generation, a multi-scale model is developed to predict the surface stress generated during absorption of the alkanethiols on a gold film.

Keywords

self-assemblysensorgrain size
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 951: Symposium E – Nanofunctional Materials, Nanostructures and Novel Devices for Biological and Chemical Detection , 2006 , 0951-E12-05
Copyright
Copyright © Materials Research Society 2007

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References

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