title: Silver nanoparticle anchored carbon dots for improved sensing, catalytic and intriguing antimicrobial activity.
abstract: Fluorescent carbon dots (NSCDs) with a size of ∼5 nm (λex = 320 nm and λem = 386 nm) have been synthesized under reflux from an alkaline mixture of dopamine and cysteine. The synthesized NSCDs are hybridized with in situ generated silver nanoparticles (AgNPs) obtained by mixing AgNO3 at room temperature. NSCDs enrich the plasmonic bands of AgNPs due to the localized surface plasmon resonance (LSPR) effect. Further enrichment of plasmon band, depending on the acetone concentration, enables acetone sensing down to 8 × 10(-5) M admixed in 1 M water. Thus, acetone induced hybrid particles with a sharp plasmon band (λex = 410 nm) become a sulfide sensing platform. Furthermore, vacuum dried stable particles (with or without acetone) have been proven to be an excellent catalyst for selective reduction of cationic dyes and they exhibit intriguing antimicrobial activity. These two types of dry particle act differently, which enables us to distinguish their altered surface functionalization in terms of catalysis and bacterial growth.
authors.affiliation: Department of Chemistry, Indian Institute of Technology, Kharagpur-721302, India. tpal@chem.iitkgp.ernet.in.
authors.forename: Jayasmita
authors.initials: J
authors.lastname: Jana
authors.forename: Samiran Sona
authors.initials: SS
authors.lastname: Gauri
authors.forename: Mainak
authors.initials: M
authors.lastname: Ganguly
authors.forename: Satyahari
authors.initials: S
authors.lastname: Dey
authors.forename: Tarasankar
authors.initials: T
authors.lastname: Pal
mesh_terms: D000096:Acetone / Q000032:analysis; D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000494:pharmacology; D001412:Bacillus subtilis / Q000187:drug effects / Q000254:growth & development; D002244:Carbon / Q000737:chemistry / Q000494:pharmacology; D002384:Catalysis; D003124:Colorimetry; D004396:Coloring Agents / Q000737:chemistry; D004926:Escherichia coli / Q000187:drug effects / Q000254:growth & development; D053768:Metal Nanoparticles / Q000737:chemistry; D008826:Microbial Sensitivity Tests; D011550:Pseudomonas aeruginosa / Q000187:drug effects / Q000254:growth & development; D012235:Rhodamines / Q000737:chemistry; D012834:Silver / Q000737:chemistry / Q000494:pharmacology; D013212:Staphylococcus epidermidis / Q000187:drug effects / Q000254:growth & development; D013440:Sulfides / Q000032:analysis
chemical_list: D000900:Anti-Bacterial Agents; D004396:Coloring Agents; D012235:Rhodamines; D013440:Sulfides; D000096:Acetone; D012834:Silver; D002244:Carbon; C029773:rhodamine B