Gold Nanoparticle‐Based Fluorometric and Colorimetric Sensing of Copper(II) Ions

Abstract

During white-light exposure, the region outside of the hologram polymerized to form a random-phase segregated morphology referred to as the floodlit region. Film thickness was controlled by the addition of 10 lm diameter glass rods to the pre-polymer syrup. The diffraction efficiency of the grating was determined through the ratio of the intensity of diffracted light to incident light using a He-Ne (632 nm) laser. SEM images were collected with a Hitachi 900S operating at 1 keV. The PM597 was excited with the doubled output (532 nm) of a Nd:YAG that had a repetition rate of 10 Hz and pulse duration of 5-8 ns. Photoluminescence (PL) was collected perpendicular to the cell with an Ocean Optics CCD/spectrometer that had a resolution of 1.9 nm.

Colorimetric sensing of copper(II) based on catalytic etching of gold nanoparticles

“…Under the optimized conditions, the Cu 2+ -specific probe exhibits high sensitivity towards Cu 2+ but also high selectivity over other possible interference ions. The method is also highlighted by its simplicity and rapidity as compared to many other nanoparticles-based colorimetric methods [32][33][34][35][36][37][38][39][40][41]. Compared with our former research [28], the present work is more timesaving and sensitive to naked-eyes.…”

Novel EDTA-ligands containing an integral perylene bisimide (PBI) core as an optical reporter unit

“…Both naphthalene 50,51 and perylene [52][53][54][55][56][57][58] based chelating agents have been reported, but to the best of our knowledge none of them with an elongated EDTA-like structure containing an integral PBI unit as an optical receptor unit. As a matter of fact, the tailor-made periphery of 1a was designed to efficiently chelate metal cations.…”

The Composites of Cationic Polyelectrolyte and Glutathione‐capped Quantum Dots for Selective Fluorescence Detection of Cu2+

“…Besides, fluorescence resonance energy transfer from the fluorophore to the quencher has been applied to sensing of Cu 2+ with high sensitivity and selectivity. [17][18][19] Recently, colloidal semiconductor nanocrystals (quan- 22 The same phenomenon has been discovered in the case of 2-mercaptioethane sulfonic acid-modified CdSe QDs. 23 The addition of F -to a solution of QDs can further improve the selectivity of QDs owing to the formation of the colorless complex FeF 6 3-.…”