title: Attachment of functionalized single-walled carbon nanotubes (SWNTs) to silicon surfaces.
abstract: Single-walled carbon nanotubes (SWNTs) were functionalized by direct fluorination and subsequent reaction with 6-aminohexanoic acid for water-soluble carboxylic acid functionalized SWNTs (AHA-SWNTs). Both of the compounds were used as precursors to attach SWNTs to APTES coated silicon surfaces. AHA-SWNTs in aqueous solution were reacted with APTES self-assembled monolayers (SAMs) with coupling reagents N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide (EDC) and N-hydroxysuccinimide (NHS). The surface coverage is a function of concentration of AHA-SWNTs, solvent and coupling method. While for the fluorinated SWNTs (F-SWNTs), direct addition of F-SWNTs to preformed APTES SAMs at 90 degrees C shows essentially no reaction, in contrast to the one-pot reaction of F-SWNTs with APTES molecules in the presence of SWNTs on a silicon substrate. This reaction route provides a convenient method to attach SWNTs to silicon surfaces.
authors.affiliation: Richard E Smalley Institute for Nanoscale Science and Technology, Carbon Nanotube Laboratory, and Department of Chemistry, Rice University, Houston, Texas 77005, USA.
authors.forename: Liling
authors.initials: L
authors.lastname: Zeng
authors.forename: Nancy
authors.initials: N
authors.lastname: Pattyn
authors.forename: Andrew R
authors.initials: AR
authors.lastname: Barron