Journal
ACS APPLIED POLYMER MATERIALS
Volume 1, Issue 5, Pages 1175-1180Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsapm.9b00180
Keywords
Raman; SERS; conjugated polymer; DFT; nanogap
Funding
- University of Hull
- UK EPSRC [EP/L025078/1]
- European COST Action Nanospectroscopy [MP1302]
- Spanish Ministerio de Economia y Competitividad (MINECO-FEDER) [CTQ2017-87054]
- Severo Ochoa program for Centers of Excellence in RD (MINECO) [SEV2016-0686]
- Campus of International Excellence (CEI) UAM+CSIC
- EPSRC [EP/L025078/1] Funding Source: UKRI
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Determining the molecular orientation at the single molecule level is of key importance for a wide range of applications ranging from molecular electronic devices to biomedical applications. In this work surface-enhanced Raman scattering (SERS) was used to probe the light-emitting conjugated polymer F8-PFB at the single molecule level using nanoparticles on an extended metallic film nanogap. The directional field enhancement of the nanogap combined with density functional theory (DFT) calculations was used to determine the orientation of the molecule. This analysis revealed that the spin-coated conjugated polymer preferentially aligns its molecular chains parallel to the metallic substrate. The integration of this approach in nanofabrication and synthesis will have a profound impact on different fields ranging from molecular electronic devices to biomedical applications.
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