title: Sensitive fluorescence detection of mercury(ii) in aqueous solution by the fluorescence quenching effect of MoS2with DNA functionalized carbon dots.
abstract: A rapid and sensitive fluorescent sensor based on the MoS2nanosheet/DNA/carbon dot nanoassembly has been developed towards the detection of mercury(ii) present in environmental samples. Bio-carbon dots (CDs) having strong fluorescence maxima at 451 nm were synthesized via one-step treatment with honey under low temperature carbonization. These CDs were nearly spherical with good size distribution and excellent monodispersity, and the average sizes of CD were around 2-4 nm as evidenced from transmission electron microscopy. The conjugation of DNA strands on the surface of the carbon dots provided an efficient fluorescent probe. The fluorescence of the MoS2nanosheet/DNA/carbon dot nanoassembly enhanced gradually with the increase in the concentration of Hg2+ions and the detection limit was found to be 1.02 nM. Furthermore, the fluorescence intensity was found to be linear with the concentration of Hg2+ions in the range from 0 to 10 nM and their respective coefficient of determination was found to be 0.93676 and 0.98178. The present MoS2nanosheet/DNA/carbon dot nanoassembly is highly selective toward Hg2+ions over a wide range of metal ions tested.
authors.affiliation: Department of Chemistry, Anna University, Guindy, Chennai - 600 025, India.
authors.forename: K
authors.initials: K
authors.lastname: Srinivasan
authors.affiliation: Department of Chemistry, Anna University, Guindy, Chennai - 600 025, India.
authors.forename: K
authors.initials: K
authors.lastname: Subramanian
authors.affiliation: Department of Zoology, Bharathiar University, Coimbatore - 641 046, India.
authors.forename: K
authors.initials: K
authors.lastname: Murugan
authors.affiliation: Department of Chemistry, Thiruvalluvar University, Vellore - 632 115, India. kdinakaran.tvu@gmail.com.
authors.forename: K
authors.initials: K
authors.lastname: Dinakaran
mesh_terms: D002244:Carbon; D004247:DNA / Q000737:chemistry*; D005456:Fluorescent Dyes; D008628:Mercury / Q000032:analysis*; D045663:Quantum Dots; D013050:Spectrometry, Fluorescence
chemical_list: D005456:Fluorescent Dyes; D002244:Carbon; D004247:DNA; D008628:Mercury