title: Earth Abundant Iron-Rich N-Doped Graphene Based Spacer and Cavity Materials for Surface Plasmon-Coupled Emission Enhancements.
abstract: 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.
authors.affiliation: Plasmonics Laboratory, Department of Chemistry, Sri Sathya Sai Institute of Higher Learning , Prasanthi Nilayam Campus, Anantapur, Andhra Pradesh, India 515134.
authors.forename: Venkatesh
authors.initials: V
authors.lastname: Srinivasan
authors.forename: Dnyanesh
authors.initials: D
authors.lastname: Vernekar
authors.forename: Garima
authors.initials: G
authors.lastname: Jaiswal
authors.forename: Dinesh
authors.initials: D
authors.lastname: Jagadeesan
authors.affiliation: Plasmonics Laboratory, Department of Chemistry, Sri Sathya Sai Institute of Higher Learning , Prasanthi Nilayam Campus, Anantapur, Andhra Pradesh, India 515134.
authors.forename: Sai Sathish
authors.initials: SS
authors.lastname: Ramamurthy
keywords: Casimir effect; N-doped graphene; Purcell factor; fluorescence enhancements; iron carbides; surface plasmon-coupled emission