title: Large scale synthesis of graphene quantum dots (GQDs) from waste biomass and their use as an efficient and selective photoluminescence on-off-on probe for Ag(+) ions.
abstract: Graphene quantum dots (GQDs) are synthesized from bio-waste and are further modified to produce amine-terminated GQDs (Am-GQDs) which have higher dispersibility and photoluminescence intensity than those of GQDs. A strong fluorescence quenching of Am-GQDs (switch-off) is observed for a number of metal ions, but only for the Ag(+) ions is the original fluorescence regenerated (switch-on) upon addition of L-cysteine.
authors.affiliation: Centre of Excellence in Solar Energy, National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune, 411008, India. sb.ogale@ncl.res.in satishogale@gmail.com.
authors.forename: Anil
authors.initials: A
authors.lastname: Suryawanshi
authors.forename: Mandakini
authors.initials: M
authors.lastname: Biswal
authors.forename: Dattakumar
authors.initials: D
authors.lastname: Mhamane
authors.forename: Rohan
authors.initials: R
authors.lastname: Gokhale
authors.forename: Shankar
authors.initials: S
authors.lastname: Patil
authors.forename: Debanjan
authors.initials: D
authors.lastname: Guin
authors.forename: Satishchandra
authors.initials: S
authors.lastname: Ogale
mesh_terms: D018533:Biomass; D002244:Carbon / Q000737:chemistry; D003545:Cysteine / Q000737:chemistry; D005456:Fluorescent Dyes / Q000737:chemistry; D006046:Gold / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry*; D006860:Hydrogen Bonding; D007477:Ions; D049449:Luminescence; D008670:Metals / Q000737:chemistry; D018625:Microscopy, Atomic Force; D046529:Microscopy, Electron, Transmission; D049329:Nanostructures / Q000737:chemistry; D010777:Photochemistry; D018515:Plant Leaves; D016062:Porosity; D045663:Quantum Dots; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet
chemical_list: D005456:Fluorescent Dyes; D007477:Ions; D008670:Metals; D002244:Carbon; D006046:Gold; D006108:Graphite; D003545:Cysteine