Abstract
Multiwalled carbon nanotube (MWNT) probe microscopy tips have been functionalized with gases, activated in a transient arc produced at the tip ends. Adhesion measurements between these tips and hydroxyl-terminated monolayers versus pH reveal that MWNT tips reacted in O 2, H 2 and N 2 display acidic, pH-independent and basic properties, respectively. MWNT tips derivatized in O 2/N 2 and H 2/N 2 mixtures demonstrate the greater reactivity of carbon nanotubes towards O 2 and H 2, respectively. Moreover, the chemical reactivity of tips functionalized in N 2 suggests termination in aromatic nitrogen heterocycles. Tip-activated gas functionalization of MWNTs provides facile generation of chemically sensitive nanoprobes.
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