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The influence of an OTS self-assembled monolayer on the wear-resistant properties of polysilicon based MEMS

Baker, MA and Li, J (2006) The influence of an OTS self-assembled monolayer on the wear-resistant properties of polysilicon based MEMS In: 11th European Conference on Applications of Surface and Interface Anlaysis, 2005-09-25 - 2005-09-30, Vienna, AUSTRIA.

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Abstract

The influence of an OTS self-assembled monolayer on the wear-resistant properties of polysilicon based MEMS Abstract: Polysilicon MEMS structures are coated with self-assembled monolayers (SAMs) to reduce stiction and improve wear resistance. This study reports on an octadecyltrichlorosilane (OTS) coated low-pressure chemical vapour deposited (LPCVD) polysilicon based MEMS test structure fabricated at Sandia National Laboratories, USA. The surface morphology and OTS layer have been studied by SEM, XPS and AFM. Nanowear properties were investigated using a diamond-tipped cantilever AFM. The presence of OTS is confirmed by XPS and AFM measurements and the polysilicon/OTS interface is found to be vulnerable to hydrolysis when stored under laboratory conditions. A comparison is made between the wear resistance of the OTS-coated and uncoated surfaces of the MEMS polysilicon components and silicon nitride substrate. Nanowear results were also obtained for CVD polysilicon and silicon nitride layers and a silicon wafer. The presence of the OTS layer was found to enhance the wear properties of the MEMS polysilicon and silicon nitride layers, with an increase in the wear resistance of up to two times for the MEMS polysilicon and up to three times for the MEMS silicon nitride.

Item Type: Conference or Workshop Item (Paper)
Additional Information: The definitive version is available at http://onlinelibrary.wiley.com/doi/10.1002/sia.2210/abstract
Uncontrolled Keywords: Science & Technology, Physical Sciences, Chemistry, Physical, Chemistry, MEMS, wear, XPS, AFM, FILMS, SI
Related URLs:
Divisions: Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Depositing User: Symplectic Elements
Date Deposited: 08 Nov 2012 19:50
Last Modified: 23 Sep 2013 18:52
URI: http://epubs.surrey.ac.uk/id/eprint/7918

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