title: Ag-CNT Architectures for Attomolar Dopamine Detection and 100-Fold Fluorescence Enhancements with Cellphone-Based Surface Plasmon-Coupled Emission Platform.
abstract: We report cellphone-based detection of dopamine with attomolar sensitivity in clinical samples with the use of a surface plasmon-coupled emission (SPCE) platform. To this end, silver-coated carbon nanotubes were used as spacer and cavity materials on SPCE substrates to obtain up to 100-fold fluorescence enhancements. The presence of silver on the carbon nanotubes helped to overcome fluorescence quenching arising due to π-π interactions between the carbon nanotube and rhodamine 6G. The competing adsorption of dopamine versus rhodamine 6G on graphene oxide was utilized to develop this sensing platform.
authors.affiliation: Plasmonics Laboratory, Department of Chemistry, Sri Sathya Sai Institute of Higher Learning, Prasanthi Nilayam, Anantapur, Andhra Pradesh, 515134, India.
authors.forename: Pradeep Kumar
authors.initials: PK
authors.lastname: Badiya
authors.affiliation: Plasmonics Laboratory, Department of Chemistry, Sri Sathya Sai Institute of Higher Learning, Prasanthi Nilayam, Anantapur, Andhra Pradesh, 515134, India.
authors.forename: Venkatesh
authors.identifier: http://orcid.org/0000-0002-4425-8260
authors.initials: V
authors.lastname: Srinivasan
authors.affiliation: Plasmonics Laboratory, Department of Chemistry, Sri Sathya Sai Institute of Higher Learning, Prasanthi Nilayam, Anantapur, Andhra Pradesh, 515134, India.
authors.forename: Tejkiran Pindi
authors.initials: TP
authors.lastname: Jayakumar
authors.affiliation: Plasmonics Laboratory, Department of Chemistry, Sri Sathya Sai Institute of Higher Learning, Prasanthi Nilayam, Anantapur, Andhra Pradesh, 515134, India. rsaisathish@sssihl.edu.in.
authors.forename: Sai Sathish
authors.initials: SS
authors.lastname: Ramamurthy
mesh_terms: D040421:Cell Phone; D005453:Fluorescence; D053768:Metal Nanoparticles / Q000737:chemistry; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010316:Particle Size; D012834:Silver / Q000737:chemistry*; D020349:Surface Plasmon Resonance; D013499:Surface Properties
chemical_list: D037742:Nanotubes, Carbon; D012834:Silver
keywords: biosensors; carbon; dopamine; graphene; nanotubes