Highly fluorescent silver oxide/C- dots nanocomposite as selective and sensitive probe for highly efficient detection of Fe(III) ions

作者：Sharma Shelia; Mehta S K; Kansal Sushil Kumar^*

来源：Sensors and Actuators B: Chemical , 2017, 243: 1148-1156.

DOI：10.1016/j.snb.2016.12.100

• Carbon dots
• Silver
• Fluorescence
• Quenching

Well crystalline Ag2O/C- dots quasispherical nanoparticles were synthesized by facile hydrothermal process assisted photo reaction. These were characterized in detail in terms of their morphological, structural, compositional and optical properties by UV-vis spectroscopy, Fourier transformation infrared spectroscopy (FTIR), Photoluminescence (PL), Powder X-ray diffraction (XRD), Transmission electron microscopy (TEM), Field Emission Scanning electron microscopy (FESEM) X-ray photoelectron spectroscopy (XPS) and Dynamic light scattering (DLS). These hydrophilic nanoparticles exhibit excellent photostability even after a month. The obtained Ag2O/C- dots exhibited a prominent emission at the wavelength of 455 nm, at optimum excitation wavelength of 370 nm. The quenching of fluorescence intensity Ag2O/C- dots upon addition of Fe3+ ions prompted to develop susceptible method for quantifying the presence of Fe3+ ions in aqueous medium. With optimized conditions, the fluorescence intensity versus concentration of Fe3+ ions gave a linear correlation, as per Stern-Volmer equation. The linear range from the calibration curve and the limit of detection were found to be 0.09-1.66 mu M and 2.5 nM, respectively. It was noteworthy to mention that the synthesized Ag2O/C- dots exhibit promising capability to be used as fluorescent probes for determination of Fe3+ ions in aqueous solutions, which is not interfered by the presence of other metal ions.

• 出版日期2017-5