Earth Abundant Iron-Rich N-Doped Graphene Based Spacer and Cavity Materials for Surface Plasmon-Coupled Emission Enhancements
2016
Srinivasan, Venkatesh | Vernekar, Dnyanesh | Jaiswal, Garima | Jagadeesan, Dinesh | Ramamurthy, Sai Sathish
We demonstrate for the first time the use of Fe-based nanoparticles on N-doped graphene as spacer and cavity materials and study their plasmonic effect on the spontaneous emission of a radiating dipole. Fe–C–MF was produced by pyrolizing FeOOH and melamine formaldehyde precursor on graphene, while Fe–C–PH was produced by pyrolizing the Fe-phenanthroline complex on graphene. The use of the Fe–C–MF composite consisting of Fe-rich crystalline phases supported on N-doped graphene presented a spacer material with 116-fold fluorescence enhancements. On the other hand, the Fe–C–PH/Ag based cavity resulted in an 82-fold enhancement in Surface Plasmon-Coupled Emission (SPCE), with high directionality and polarization of Rhodamine 6G (Rh6G) emission owing to Casimir and Purcell effects. The use of a mobile phone as a cost-effective fluorescence detection device in the present work opens up a flexible perspective for the study of different nanomaterials as tunable substrates in cavity mode and spacer applications.
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