Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 111, Issue 24, Pages 8638-8643Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp0709611
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The unique optical properties of semiconducting single-walled carbon nanotubes (SWNTs) are exquisitely sensitive to variations in the surrounding environments. Here, we have studied the redox chemistry of SWNTs encased with double-stranded deoxyribonucleic acid (DNA) reacted with either hydrogen peroxide H2O2 or glucose in the presence of the glucose oxidase enzyme. The DNA-SWNT hybrids are prepared in aqueous solution by sonication that cuts the DNA into short fragments of 100-300 base pairs which efficiently wrap individual nanotubes. The DNA-SWNT hybrids are optically sensitive to H2O2 and glucose, and the hybrid surface can be regenerated by dialytically removing the hydrogen peroxide. This study reinforces the potential of DNA-SWNT hybrids for use in immunoassays and glucose sensing.
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