Tingyao Zhou

Silver–Gold Alloy Nanoclusters as a Fluorescence-Enhanced Probe for Aluminum Ion Sensing

In this paper, the development of a simple method is described for preparing highly red fluorescent mercaptosuccinic acid stabilized AgAu alloy nanoclusters (MSA-AgAu NCs) through the core etching of Ag nanoparticles (NPs) and a galvanic exchange reaction using nonorganic solvent and no multistep centrifuge washing. The as-prepared MSA-AgAu NCs were characterized using spectroscopic and microscopic techniques. After covalently attaching methoxy-poly(ethylene glycol)-NH2 (m-PEG-NH2), PEGylated MSA-AgAu NCs were still stable even in 1 M NaCl. Probably based on the deposition of Al(3+)-enhanced fluorescence, the PEGylated MSA-AgAu NCs offered highly selective and sensitive sensing of Al(3+) in aqueous solution with a detection limit of 0.8 μM.

A novel solid-state electrochemiluminescence sensor for the determination of hydrogen peroxide based on an Au nanocluster–silica nanoparticle nanocomposite

A gold nanocluster@bovine serum albumin-silica nanoparticle composite has been synthesized and used for the solid-state electrochemiluminescence (ECL) sensing of hydrogen peroxide. The ECL characteristics have also been studied.

A dissolved oxygen sensor based on composite fluorinated xerogel doped with platinum porphyrin dye

A new functional fluorinated material taking n-propyltrimethoxysilicane (n-propyl-TriMOS) and 3,3,3-trifluoropropyltrimethoxysilicane (TFP-TriMOS) as precursors was applied to construct a novel dissolved oxygen sensing film. The sensing film was fabricated by dip-coating the functional fluorinated material-doped [meso-tetrakis(pentafluorophenyl) porphyinato] platinum(II) (PtF(20) TPP) onto a glass slide. The oxygen sensing film exhibited a good linear relationship, fast response time, long stability and high sensitivity to dissolved oxygen. In the developed optical oxygen sensor, an LED and a photodiode were composed to construct a back-detection optical system not needing an optical fiber based on fluorescence intensity detection. The smart optical oxygen sensor based on the PtF(20) TPP fluorescence quenching possesses the advantages of portability and low cost and can be applied to the dissolved oxygen in situ monitoring in seawater.

An in situ applicable colorimetric Cu2+ sensor using quantum dot quenching

In this study, a rapid, convenient and in situ applicable Cu2+ sensor was constructed based on a luminescent layer immobilizing Ru(bpy)3Cl2 with a maximum wavelength of 600 nm, which was taken as the reference background light. The luminescence intensity of the layer was kept constant and isolated from the oxygen change in the solution due to the hybrid polyacrylonitrile–dimethylsulfoxide used in the immobilization of the Ru(bpy)3Cl2. The CdTe quantum dot (QD) luminescence, with a maximum wavelength of 520 nm, was quenched to different degrees depending on the Cu2+ concentration in the solution. Using a commercial camera, different colors could be captured in different Cu2+ concentrations. This color change was caused by the composite light with stable luminescence from the Ru(bpy)3Cl2 layer and the changeable fluorescence of the CdTe QDs. Sensor characteristics, including the co-existing ions, oxygen content, temperature effect, and sensor stability, were investigated.