title: Green Luminescent CdTe Quantum Dot Based Fluorescence Nano-Sensor for Sensitive Detection of Arsenic (III).
abstract: Arsenic (As3+) is a hazardous and ubiquitous element; hence the quantitative detection of arsenic in various kinds of environmental sample is an important issue. Herein, we reported L-cysteine capped CdTe Quantum dot based optical sensor for the fluorometric detection of arsenic (III) in real water sample. The method is based on the fluorescence quenching of QDs with the addition of arsenic solution that caused the reduction in fluorescence intensity due to strong interaction between As3+and L-cysteine to form As(Cys)3. The calibration curve was linear over 2.0 nM-0.5 μM arsenic with limit of detection (LOD) of 2.0 nM, correlation coefficient (r2) of 0.9698, and relative standard deviation (RSD %) of 5.2%. The Stern-Volmer constant for the quenching of CdTe QDs with As3+at optimized condition was evaluated to be 1.17 × 108L mol-1s-1. The feasibility of the sensor has been analyzed by checking the inference of common metal ions available in the water such as K+, Na+, Mg2+, Ca2+, Ba2+, Cu2+, Ni2+, Zn2+, Al3+, Co2+, Cr2+, Fe3+and its higher oxidation state As5+. Graphical Abstract Schematic representation of As3+detection by L-Cysteine capped CdTe QDs.
authors.affiliation: School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur, CG, 492010, India.
authors.forename: Sandeep K
authors.initials: SK
authors.lastname: Vaishanav
authors.affiliation: School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur, CG, 492010, India.
authors.forename: Jyoti
authors.initials: J
authors.lastname: Korram
authors.affiliation: School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur, CG, 492010, India.
authors.forename: Priyanka
authors.initials: P
authors.lastname: Pradhan
authors.affiliation: School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur, CG, 492010, India.
authors.forename: Kumudini
authors.initials: K
authors.lastname: Chandraker
authors.affiliation: Department of Chemistry, Govt. Madhav Science P. G. College, Ujjain, MP, 456010, India.
authors.forename: Rekha
authors.initials: R
authors.lastname: Nagwanshi
authors.affiliation: School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur, CG, 492010, India.
authors.forename: Kallol K
authors.initials: KK
authors.lastname: Ghosh
authors.affiliation: School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur, CG, 492010, India. manmohanchem@gmail.com.
authors.forename: Manmohan L
authors.initials: ML
authors.lastname: Satnami
mesh_terms: D001151:Arsenic / Q000032:analysis*; D015374:Biosensing Techniques / Q000379:methods*; D019187:Cadmium Compounds / Q000737:chemistry*; D005453:Fluorescence; D005456:Fluorescent Dyes / Q000737:chemistry*; D049449:Luminescence; D045663:Quantum Dots / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000379:methods; D013691:Tellurium / Q000737:chemistry*; D014867:Water / Q000032:analysis
chemical_list: D019187:Cadmium Compounds; D005456:Fluorescent Dyes; D014867:Water; D001151:Arsenic; D013691:Tellurium; C028337:cadmium telluride
keywords: CdTe QDs; Detection of As3+; Fluorescence Nano-sensor; LOD