Simple electrochemical growth of copper nanoparticles decorated silver nanoleaves for the sensitive determination of hydrogen peroxide in clinical lens cleaning solutions

摘要

A novel, single step preparation of copper nanoparticles decorated silver nanoleaves (AgNLs-CuNPs) bimetallic composite at glassy carbon electrode (GCE) was done through electrochemical potentiostatic method. Three different morphologies namely, nanoparticles, nanodentrites and nanoparticles decorated nanoleaves were obtained for copper, silver and silver-copper as the result of deposition. Moreover, the obtained AgNLs-CuNPs composite is highly dense compared to their individuals. This was confirmed by field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). The crystal planes and elemental composition of the prepared nanocomposites were examined by X-ray diffraction (XRD) spectroscopy, Energy dispersive X-ray (EDX) spectroscopy and X-ray photoelectron spectroscopy (XPS). The highly dense AgNLs-CuNPs composite modified GCE showed a well-defined cathodic peak at -0.195 V towards H_2O_2. The cyclic voltammetry and amperometric studies revealed the excellent electrocatalytic ability of AgNLs-CuNPs/GCE towards the reduction of H_2O_2 compared to only AgNDs and CuNPs. Remarkably, the fabricated AgNLs-CuNPs/GCE displayed a very low detection limit (0.095 μM) with high sensitivity (6190 μAmM~(-1) cm~(-2)). Our demonstrated sensor holds good in a linear range from 0.5 to 1015 μM. Additionally, the selective determination of hydrogen peroxide was achieved using AgNLs-CuNPs/GCE even in the presence of other interfering biomolecules. The real sample analysis was performed in commercial clinical lens cleaning solutions to demonstrate the practicability of our sensor.