title: A novel and convenient near-infrared fluorescence "turn off-on" nanosensor for detection of glucose and fluoride anions.
abstract: In this paper, 3-aminobenzeneboronic acid functionalized CuInS2 quantum dots (APBA-CuInS2 QDs) were prepared and utilized as a near-infrared fluorescence nanosensor for the detection of glucose and fluoride anions. The APBA-CuInS2 QDs had a symmetric fluorescence emission centered at 742nm that was in the near-infrared spectral region. The APBA functional groups, which were reactive toward vicinal diols, could covalently bridge the glucose molecule and induced the initial dispersed APBA-CuInS2 QDs aggregate to form a large assembly, leading to the fluorescence of APBA-CuInS2 QDs turned off via the surface quenching states induced mechanism. When fluoride anions were added into the APBA-CuInS2 QDs/glucose system, the assembly was destroyed and as a result the quenched fluorescence dramatically turned on. The proposed nanosensor could be used for glucose detection in the concentration range of 0.005-8mmolL(-1) with a detection limit of 1.2μmolL(-1). The linear range for fluoride anions was 0.1-700μmolL(-1) with a detection limit of 0.029μmolL(-1). Furthermore, the feasibility of the proposed nanosensor in real samples assay was also studied and satisfactory results were obtained.
authors.affiliation: Department of Analytical Chemistry, College of Chemistry, Jilin University, Changchun, 130012, China.
authors.forename: Ziping
authors.initials: Z
authors.lastname: Liu
authors.affiliation: Department of Analytical Chemistry, College of Chemistry, Jilin University, Changchun, 130012, China.
authors.forename: Linlin
authors.initials: L
authors.lastname: Liu
authors.affiliation: Department of Analytical Chemistry, College of Chemistry, Jilin University, Changchun, 130012, China.
authors.forename: Minghui
authors.initials: M
authors.lastname: Sun
authors.affiliation: Department of Analytical Chemistry, College of Chemistry, Jilin University, Changchun, 130012, China. Electronic address: suxg@jlu.edu.cn.
authors.forename: Xingguang
authors.initials: X
authors.lastname: Su
mesh_terms: D015374:Biosensing Techniques / Q000379:methods; D001786:Blood Glucose / Q000032:analysis*; D001897:Boronic Acids / Q000737:chemistry*; D005453:Fluorescence; D005456:Fluorescent Dyes / Q000737:chemistry*; D005459:Fluorides / Q000032:analysis*; D006801:Humans; D057230:Limit of Detection; D045663:Quantum Dots / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000379:methods*; D014867:Water / Q000032:analysis*
chemical_list: D001786:Blood Glucose; D001897:Boronic Acids; D005456:Fluorescent Dyes; D014867:Water; C028592:3-aminobenzeneboronic acid; D005459:Fluorides
keywords: CuInS(2) QDs; Fluorescence “turn off–on”; Fluoride anions; Glucose; Near-infrared nanosensor