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Optical pH Response of DNA Wrapped HiPco Carbon Nanotubes

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Abstract:

Solubilization of single-walled carbon nanotubes in aqueous solution by surface functionalization is of great interest for biosensor applications and separation of individual nanotubes. Here we have observed that HiPco nanotubes can be stably dispersed into double-stranded DNA aqueous solutions. Interestingly, the first optical interband transitions of the DNA wrapped semiconducting HiPco nanotubes possess a unique pH dependence, a phenomenon observed in SDS-encased and carboxylic group functionalized single-walled carbon nanotubes. The unique optical pH dependence of surface modified semiconducting nanotubes may have promising applications in optical biosensors.

Keywords: AQUEOUS SOLUTION; BIOSENSOR; DNA; HIPCO; OPTICAL ABSORPTION; PH DEPENDENCE; SINGLE-WALLED CARBON NANOTUBES; SOLUBILIZATION; SURFACE FUNCTIONALIZATION

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2005.155

Publication date: July 1, 2005

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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