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Carbon Nanotube-Based Biosensor


  • The authors thank Dr. Yuanchang Lu and the MRSEC Shared Facilities at Harvard University for access to instrumentation and for assistance with SEM and XPS measurements.


Carbon nanotubes, compounded into plastic to create bulk electrodes, form the basis of a novel sensor for biological assays. The nanotubes function as both a solid phase and working electrode for generation of electrochemiluminescence, the detection method used in this system. The Figure shows a scanning electron microscopy image of a composite used for an immunoassay. The bright spots in the image are 10 nm diameter gold colloids covalently attached to antibodies. The inset shows a region of a composite with no gold colloids.

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