摘要
Redox activity of copper species immobilized poly(o-aminophenol)/multi-walled carbon nanotube(Cu@MWCNT-POAP)composite is reported for direct electrocatalysis towards detection of H_(2)O_(2).The Cu@MWCNT-POAP composite was prepared by a single step in situ electrochemical method.The as-prepared Cu@MWCNT-POAP composites were characterized by field emission scanning electron microscopy,Fourier transform infrared spectroscopy,Raman spectroscopy,X-ray diffraction,and electrochemical impedance spectroscopy.Cyclic voltammetry(CV)studies highlighted the good redox behavior of the Cu@MWCNT-POAP composite resulting from direct electron transfer behavior of the copper redox couple(Cu^(2+)/Cu^(+)).The Cu@MWCNT-POAP composite displayed superior electrocatalytic activity and high performance towards detection of H_(2)O_(2)because of its large surface area and homogenous immobilization of Cu species on the MWCNT-POAP composite.The analytical sensitivity and detection limit of the sensor were 831μA mM^(-1)cm^(-2)and 30 nM,respectively.In addition,bio-catalytic activity of the sensor was evaluated using the Michaelis-Menten constant.The Cu@MWCNT-POAP composite showed excellent stability and reproducibility,and good recoveries for determination of H_(2)O_(2)in milk,bleach cream,and contact lens solutions.
基金
supported by the National Science Council and the Ministry of Education of Taiwan(Republic of China).
