Inlaid Multi-Walled Carbon Nanotube Nanoelectrode Arrays for Electroanalysis
Jun Li
Center for Nanotechnology, NASA Ames Research Center, Moffett Field, CA 94035
Search for more papers by this authorJessica E. Koehne
Center for Nanotechnology, NASA Ames Research Center, Moffett Field, CA 94035
Search for more papers by this authorAlan M. Cassell
Center for Nanotechnology, NASA Ames Research Center, Moffett Field, CA 94035
Search for more papers by this authorHua Chen
Center for Nanotechnology, NASA Ames Research Center, Moffett Field, CA 94035
Search for more papers by this authorHou Tee Ng
Center for Nanotechnology, NASA Ames Research Center, Moffett Field, CA 94035
Search for more papers by this authorQi Ye
Center for Nanotechnology, NASA Ames Research Center, Moffett Field, CA 94035
Search for more papers by this authorWendy Fan
Center for Nanotechnology, NASA Ames Research Center, Moffett Field, CA 94035
Search for more papers by this authorJie Han
Center for Nanotechnology, NASA Ames Research Center, Moffett Field, CA 94035
Search for more papers by this authorM. Meyyappan
Center for Nanotechnology, NASA Ames Research Center, Moffett Field, CA 94035
Search for more papers by this authorJun Li
Center for Nanotechnology, NASA Ames Research Center, Moffett Field, CA 94035
Search for more papers by this authorJessica E. Koehne
Center for Nanotechnology, NASA Ames Research Center, Moffett Field, CA 94035
Search for more papers by this authorAlan M. Cassell
Center for Nanotechnology, NASA Ames Research Center, Moffett Field, CA 94035
Search for more papers by this authorHua Chen
Center for Nanotechnology, NASA Ames Research Center, Moffett Field, CA 94035
Search for more papers by this authorHou Tee Ng
Center for Nanotechnology, NASA Ames Research Center, Moffett Field, CA 94035
Search for more papers by this authorQi Ye
Center for Nanotechnology, NASA Ames Research Center, Moffett Field, CA 94035
Search for more papers by this authorWendy Fan
Center for Nanotechnology, NASA Ames Research Center, Moffett Field, CA 94035
Search for more papers by this authorJie Han
Center for Nanotechnology, NASA Ames Research Center, Moffett Field, CA 94035
Search for more papers by this authorM. Meyyappan
Center for Nanotechnology, NASA Ames Research Center, Moffett Field, CA 94035
Search for more papers by this authorAbstract
The rapid development in nanomaterials and nanotechnologies has provided many new opportunities for electroanalysis. We review our recent results on the fabrication and electroanalytical applications of nanoelectrode arrays based on vertically aligned multi-walled carbon nanotubes (MWCNTs). A bottom-up approach is demonstrated, which is compatible with Si microfabrication processes. MWCNTs are encapsulated in SiO2 matrix leaving only the very end exposed to form inlaid nanoelectrode arrays. The electrical and electrochemical properties have been characterized, showing well-defined quasireversible nanoelectrode behavior. Ultrasensitive detection of small redox molecules in bulk solutions as well as immobilized at the MWCNT ends is demonstrated. A label-free affinity-based DNA sensor has shown extremely high sensitivity approaching that of fluorescence techniques. This platform can be integrated with microelectronics and microfluidics for fully automated microchips.
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