دورية
Resonant, Plasmonic Raman Enhancement of α-6T Molecules Encapsulated in Carbon Nanotubes
| العنوان: | Resonant, Plasmonic Raman Enhancement of α-6T Molecules Encapsulated in Carbon Nanotubes |
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| المؤلفون: | Wasserroth, Sören, Heeg, Sebastian, Mueller, Niclas S., Kusch, Patryk, Hübner, Uwe, Gaufrès, Etienne, Tang, Nathalie Y.-W., Martel, Richard, Vijayaraghavan, Aravind, Reich, Stephanie |
| المصدر: | The Journal of Physical Chemistry - Part C; April 2019, Vol. 123 Issue: 16 p10578-10585, 8p |
| مستخلص: | Surface-enhanced Raman scattering (SERS) and resonant Raman scattering are widely used techniques to enhance the Raman intensity of molecules and nanomaterials by several orders of magnitude. In SERS, typically, molecules are investigated and their intrinsic resonance is often ignored while discussing the plasmonic enhancement. Here, we study α-sexithiophenes encapsulated in carbon nanotubes placed in the center of a nanodimer. By dielectrophoretic deposition, we place the nanotubes precisely in the center of a plasmonic gold nanodimer and observe SERS enhancement from individual tube bundles. The encapsulated molecules are not subjected to chemical enhancement because of the protective character of the nanotube. Polarization-dependent Raman measurements confirm the alignment of the molecules within the carbon nanotubes (CNTs) and reveal the influence of the plasmonic near field on the molecule’s Raman intensity. We investigate the encapsulated molecules in small CNT bundles with and without plasmonic enhancement and determine the molecular and plasmonic resonance by tuning the excitation wavelength. We observe a strong red shift of the maximum Raman intensity under plasmonic enhancement toward the plasmon resonance. |
| قاعدة البيانات: | Supplemental Index |
| تدمد: | 19327447 19327455 |
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| DOI: | 10.1021/acs.jpcc.9b01600 |