Baoqiang Lv

Preparation and Characterization of Fe3O4/Ag Composite Magnetic Nanoparticles

Fe3O4 magnetic nanoparticles being used as seeding materials, Ag+ ions on the Fe3O4 magnetic nanoparticles reduced to the metal form by tartaric acid using heated treatment. Thus, Fe3O4/Ag composite core-shell magnetic nanoparticles were synthesized. The products were characterized by transmission electron microscope (TEM) and x-ray diffraction (XRD). Both TEM and XRD results showed that the Ag nanoparticles were well distributed on the surface of Fe3O4 magnetic nanoparticles. The size for Fe3O4/Ag composite magnetic nanoparticles which were spherical shape was ≃40 nm. Furthermore, the magnetic properties of samples were characterized on a vibrating sample magnetometer. Under optimal conditions, Fe3O4/Ag composite nanoparticles showed higher magnetism than pure Fe3O4 nanoparticles.

Fabrication of gold nanoparticles using luminol as a reductive and protective reagent

An easy and simple reaction is employed to synthesize ligand-protected gold nanoparticles. In this reaction, luminol is used as a reductive and protective reagent to prepare gold nanoparticles in aqueous solution. It includes two steps: chemiluminescence and formation of gold nanoparticles. The formation processes were monitored by resonance light scattering spectroscopy, and the results were observed by transmission electron microscopy and x-ray photoelectron spectroscopy. Highly stable gold nanoparticles about 110 ± 2 nm in size can be readily obtained. A new insight into the design of water-soluble ligand-protected gold nanoparticles for biomedical, analytical, and catalytic applications has been provided.

Flow injection analysis of resorcinol using inhibited Rhodamine B/Cerium(IV) chemiluminescence system

The fluorescent dye Rhodamine B (RhB), in combination with a strong oxidant Ce(IV), was used to investigate the properties of three important polyphenols, resorcinol, catechol, and hydroquinone. The reaction of RhB with Ce(IV) solution in acidic medium was found to elicit strong chemiluminescence (CL). The CL signal remarkably weakened in the presence of resorcinol whereas the two other isomers, catechol, and hydroquinone, hardly had any effect in the same range of concentrations. Based on these observations, a new flow-injection CL method was developed for the determination of resorcinol. In addition, a brief discussion of possible mutual interaction mechanism between the three polyphenols and the components of the system is also presented.

Electrochemiluminescence of tri(2,2′-bipyridine)ruthenium in aqueous solution on a gold-nanoparticle-modified glassy carbon electrode

The electrochemical behavior of electrochemical deposition of Au nanoparticles onto a glassy carbon electrode (GCE) and its application for the electrocatalytic electrogenerated chemiluminescence (ECL) of Ru(bpy)32+ in an aqueous solution without coreaction are investigated in this report. The modification of GCE by Au nanoparticles results in excellent catalysis of the ECL of Ru(bpy)32+. The effects of various factors, such as potential scan range, the presence of nitrogen and oxygen, and the scan rate on Ru(bpy)32+. ECL peaks, were systematically studied. This article has provided insight into the design of an Au-nanoparticle-modified electrode for ECL, analytical and catalytic applications.

In situ coordination of pyridine, quinoline, and quinoxaline with copper(I) iodide at the solid–liquid interface: Formation, characterization, and function of the microcrystal films

An in situ surface-reaction approach has been developed for the synthesis of microcrystals Cu 4 I 4 (C 6 H 5 N) 4 , Cu 4 I 4 (C 9 H 7 N) 4 , and Cu 2 I 2 (C 8 H 6 N 2 ) in solid films. Microcrystals of Cu 4 I 4 (C 6 H 5 N) 4 , Cu 4 I 4 (C 9 H 7 N) 4 , and Cu 2 I 2 (C 8 H 6 N 2 ) were easily formed on a copper substrate at the solid Cu–liquid pyridine (C 6 H 5 N),–quinoline (C 9 H 7 N), and–quinoxaline (C 8 H 6 N 2 ) interfaces. The resulting microcrystal films were characterized by photoluminescence spectroscopy, scanning electron microscopy, transmission electron microscopy, energy dispersive x-ray spectroscopy, x-ray diffraction, and electrochemical impedance spectroscopy. The effect of ligands on the morphology of the film materials and their chemical properties were also discussed. These microcrystal films possessing reversible photocurrent and photovoltage properties were studied in detail. The photoactive and mechanically stable complex films described here may provide new strategies for fabricating photoluminescence solid films, photomodulation potential, and current films. The potential applications of the microcrystal films are for small light-induced electronic junction and photoluminescence sensors.

A facile photochemical route for the synthesis of gold nanoparticles

Synthesis of high-quality, water-dispersed gold nanoparticles (AuNPs), has been prepared employing luminol as a special reductant, via direct irradiation of the molecular precursors rather than traditional heat of the solvent. The final quality of the photochemically generated nanomaterial was characterized by transmission electron microscopy, resonance light scattering spectra, and cyclic voltammetry. AuNPs could enhance the chemiluminescence intensity of the luminol-H2O2 system, attributing to their catalysis. On the basis, we developed a nanoparticle-based chemiluminescence method for the determination of H2O2. The results demonstrated that it was possible to detect hydrogen peroxide in the range of 10−8–10−3 M.