关键词:
Dopamine
Electrochemical sensor
Molybdenum disulfide
Gold nanoparticles
摘要:
Dopamine(DA)is a vital neurotransmitter,and accurate detection of its concentration is critical for both clinical diagnos-tics and neuroscience *** to its electrochemical activity,DA is commonly detected using electrochemical methods,which are favored for their simplicity,fast response time,and suitability for in vivo *** this work,a highly sensitive DA electrochemical sensor was developed using an Au@MoS_(2)composite,created by modifying molybdenum disulfide(MoS_(2))nanosheets with gold nanoparticles through HAuCl_(4) reduction,and it was aimed at enhancing DA adsorption and improving detection *** Electron Microscopy(SEM),transmission electron microscopy(TEM),Energy Dispersive Spectroscopy(EDS),X-ray photoelectron spectroscopy(XPS)and X-ray Diffraction(XRD)confirmed the suc-cessful synthesis of Au@MoS_(2)and the uniform distribution of gold nanoparticles across the MoS_(2)***,the electrochemical characterization demonstrated that the Au@MoS_(2)/GCE exhibited distinct oxidation peaks in a 10μmol·L^(-1)DA solution,with significantly enhanced electrochemical activity compared to both unmodified GCE and pristine MoS_(2).Furthermore,differential pulse voltammetry(DPV)further revealed a strong linear relationship between DA concentration and the current response in the range of 800 nmol·L^(-1)to 10μmol·L^(-1),with a low detection limit(LOD)of 78.9 nmol·L^(-1)(S/N=3).Additionally,the sensor showed excellent selectivity against other interfering ***,the laser-induced Au@MoS_(2)(LIAu@MoS_(2)),with its abundance of negatively charged surface defects,enabled the ultra-sensitive detection of the ultra-low concentrations of *** conclusion,the successfully fabricated Au@MoS_(2)based sensor offers advantages such as low cost,ease of operation,and scalability,making it a promising candidate for biosensing applications due to its enhanced DA detection capabilities.