Chemical and biochemical sensing with modified single walled carbon nanotubes.
Chemistry
; 9(16): 3732-9, 2003 Aug 18.
Article
en En
| MEDLINE
| ID: mdl-12916096
ABSTRACT
The nano dimensions, graphitic surface chemistry and electronic properties of single walled carbon nanotubes make such a material an ideal candidate for chemical or biochemical sensing. Carbon nanotubes can be nondestructively oxidized along their sidewalls or ends and subsequently covalently functionalized with colloidal particles or polyamine dendrimers via carboxylate chemistry. Proteins adsorb individually, strongly and noncovalently along nanotube lengths. These nanotube-protein conjugates are readily characterized at the molecular level by atomic force microscopy. Several metalloproteins and enzymes have been bound on both the sidewalls and termini of single walled carbon nanotubes. Though coupling can be controlled, to a degree, through variation of tube oxidative pre-activation chemistry, careful control experiments and observations made by atomic force microscopy suggest that immobilization is strong, physical and does not require covalent bonding. Importantly, in terms of possible device applications, protein attachment appears to occur with retention of native biological structure. Nanotube electrodes exhibit useful voltammetric properties with direct electrical communication possible between a redox-active biomolecule and the delocalized pi system of its carbon nanotube support.
Buscar en Google
Bases de datos:
MEDLINE
Asunto principal:
Técnicas Biosensibles
/
Nanotubos de Carbono
Idioma:
En
Revista:
Chemistry
Asunto de la revista:
QUIMICA
Año:
2003
Tipo del documento:
Article
País de afiliación:
Reino Unido