Dear Suyong

You may need to hydrolyse the alkoxide groups on the OTS using a small
amount of water and a catalytic amount of acid. Gelest has several
procedures online in their library 
that describe how to silylate surfaces.

"Applying a silane coupling agent" is a good start for a few standard
procedures
http://www.gelest.com/trackingredirect.asp?goto=/Library/09Apply.pdf

"Tailoring surfaces with silanes" gives a more extensive look at the
topic
http://www.gelest.com/trackingredirect.asp?goto=/Library/08Tailor.pdf

Regards,

Chris Blanford

--
Christopher F. Blanford
Inorganic Chemistry Laboratory, South Parks Road, Oxford, OX1 3QR, UK
Phone: +44 (0)1865 282603; Fax: +44 (0)1865 272690
PGP keyID: 8D830BC9  http://pgp.mit.edu/