Controllable synthesis of BiPr composite oxide nanowires electrocatalyst for sensitive L-cysteine sensing properties.
Jianfeng HuangFeihu TaoFeiyang LiZhengyu CaiYong ZhangChuangang FanLizhai PeiPublished in: Nanotechnology (2022)
BiPr composite oxide nanowires with rhombodedral Bi 1.35 Pr 0.65 O 3 , monoclinic Bi 2 O 3 and monoclinic Pr 5 O 9 phases were synthesized via a facile sodium dodecyl sulfate (SDS) assisted hydrothermal route. The obtained nanowires were characterized by x-ray diffraction, electron microscopy, x-ray photoelectron spectroscopy and electrochemical measurements. The BiPr composite oxide nanowires possess poly-crystalline structure, semi-circular tips, diameter and length of 20-100 nm and several micrometers, respectively. SDS is essential for the formation of the BiPr composite oxide nanowires which can be explained by a SDS assisted hydrothermal growth process. Electrochemical impedance spectroscopy shows that the electrons are easier to transfer by the surface of the BiPr composite oxide nanowires modified glassy carbon electrode (GCE) than bare GCE. The BiPr composite oxide nanowires modified GCE possesses good electro-catalytic activity for L-cysteine detection with a pair of quasi-reversible cyclic voltammetry peaks at +0.04 V and -0.72 V for the oxidation and reduction of L-cysteine, respectively. The roles of the scan rate, electrolyte species and L-cysteine concentration on the electrochemical responses of L-cysteine at the nanowires modified GCE were systematically analyzed. The BiPr composite oxide nanowires modified GCE presents a linear response range from 0.001 to 2 mM and detection limit of 0.27 μ M, good reproducibility and stability.
Keyphrases
- room temperature
- reduced graphene oxide
- gold nanoparticles
- ionic liquid
- electron microscopy
- high resolution
- label free
- living cells
- fluorescent probe
- computed tomography
- dual energy
- molecularly imprinted
- solid state
- magnetic resonance imaging
- nitric oxide
- risk assessment
- hydrogen peroxide
- quantum dots
- sensitive detection