Presence Of Nickel Nanoparticles Research Articles

Direct Electrochemistry of Hemoglobin on Nickel Ion Implanted-Modified ITO Electrode and Biosensing for H2O2

A novel nickel ion implanted-modified indium tin oxide (Ni/ITO) electrode was prepared, and the existence of nickel nanoparticles was characterized by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Upon fabrication of Ni/ITO with hemoglobin (Hb) and Nafion, Nafion/Hb/Ni/ITO for hydrogen peroxide (H2O2) biosensor was developed. Ultraviolet-visible (UV-vis) spectroscopy shows that Hb remains in its native structure. Electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) and amperometry were employed for electrochemical studies. The results show that the presence of nickel nanoparticles can enhance the electrochemical response of Hb. A pair of well-defined and reversible CV peaks for the protein heme Fe(III)/Fe(II) redox couples was obtained at the prepared electrode Nafion/Hb/Ni/ITO. The biosensor exhibits good electrocatalytic activity toward H2O2. Amperometric response varies linearly with H2O2 concentration ranging from 0.8 μM to 122 μM with a detection limit of 0.5 μM. The apparent Michaelis-Menten constant is calculated to be 0.325 mM indicating a high affinity to H2O2. Moreover, the modified biosensor exhibits high sensibility, good reproducibility, and long-term stability.

One-Pot Synthesis of Stilbenes from Alcohols through a Wittig-Type Olefination Reaction Promoted by Nickel Nanoparticles

A series of stilbenes has been synthesised in one pot from benzyl alcohols and benzylidenetriphenylphosphorane through a Wittig-type olefination reaction in the presence of nickel nanoparticles.

Hydrogen-Transfer Amination of Aldehydes

Nickel nanoparticles (NiNPs) were generated from anhydrous nickel(II) chloride by treatment with lithium powder and a catalytic amount of 4,4¢-di-tert-butylbiphenyl (DTBB, 5 mol%) in THF at room temperature. The hydrogen-transfer reductive amination of aldehydes 1 with amines 2 was carried out in the presence of NiNPs in i-PrOH to give the corresponding products 3 in 30-99% yield (20 examples).