期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 5, 期 21, 页码 3742-3749出版社
AMER CHEMICAL SOC
DOI: 10.1021/jz5017813
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资金
- U.S. Army Research Office [W911NF-12-1-0025]
- National Science Foundation [DMR-1350537]
- Air Force Office of Scientific Research [FA9550-12-1-0063]
- Department of Defense, Air Force Office of Scientific Research, National Defense Science and Engineering Graduate (NDSEG) Fellowship [32 CFR 168a]
- NSF - University of Wisconsin Materials Research Science and Engineering Center [DMR-1121288]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1350537] Funding Source: National Science Foundation
Poly(9,9-dioctylfluorene-2,7-diyl) (PFO) exhibits exceptional (n,m) chirality and electronic-type selectivity for near-armchair semiconducting carbon nanotubes. To better understand and control the factors governing this behavior, we experimentally determine the surface coverage and binding configuration of PFO on nanotubes in solution using photoluminescence energy transfer and anisotropy measurements. The coverage increases with PFO concentration in solution, following Langmuir-isotherm adsorption behavior with cooperativity. The equilibrium binding constant (PFO concentration in solution at half coverage), K-A, depends on (n,m) and is 1.16 +/- 0.30, 0.93 +/- 0.12, and 1.13 +/- 0.26 mg mL(-1) for the highly selected (7,5), (8,6), and (8,7) species, respectively, and the corresponding PFO wrapping angle at low coverage is 12, 17, and 14 +/- 2 degrees, respectively. In contrast, the inferred K-A for metallic nanotubes is nearly an order of magnitude greater, indicating that the semiconducting selectivity increases with decreasing PFO concentration. This understanding will quantitatively guide future experimental and computational efforts on electronic type-sorting carbon nanotubes.
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