期刊
NANO LETTERS
卷 8, 期 9, 页码 2706-2711出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl801038t
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资金
- Deutsche Forschungsgemeinschaft [DFG-HA4405/3-1]
- U.S. Department of Energy [DE-FG02-05ER46207]
- Alfred P. Sloan Research Fellowship
- Natural Sciences and Engineering Research Council of Canada Fellowship
- U.S. National Science Foundation [EEC-0647560, DMR-0706067]
- CNPq
- CAPES-Probral
We studied the local optical response of semiconducting single-walled carbon nanotubes to wrapping by DNA segments using high resolution tip-enhanced near-field microscopy. Photoluminescence (PL) near-field images of single nanotubes reveal large DNA-wrapping-induced red shifts of the exciton energy that are two times higher than indicated by spatially averaging confocal microscopy. Near-field PL spectra taken along nanotubes feature two distinct PL bands resulting from DNA-wrapped and unwrapped nanotube segments. The transition between the two energy levels occurs on a length scale smaller than our spatial resolution of about 15 nm.
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