Abstract
Cuprous oxide/silver (Cu2O/Ag) nanocomposites were prepared via a facile one-step method and used to construct an electrochemical sensor for hydrogen peroxide (H2O2) detection. In this method, AgNO3 and Cu(NO3)2 were reduced to Cu2O/Ag nanocomposites by glucose in the presence of hexadecyl trimethyl ammonium bromide (CTAB) at a low temperature. The optimum condition was the molar ratio of silver nitrate and copper nitrate of 1:10, the temperature of 50 °C. Under this condition, Cu2O/Ag nanocomposites were obtained with uniformly distributed and tightly combined Cu2O and Ag nanoparticles. The size of Cu2O particles was less than 100 nm and that of Ag particles was less than 20 nm. Electrochemical experiments indicate that the Cu2O/Ag nanocomposites-based sensor possesses an excellent performance toward H2O2, showing a linear range of 0.2 to 4000 μM, a high sensitivity of 87.0 μA mM−1 cm−2, and a low detection limit of 0.2 μM. The anti-interference capability experiments indicate this sensor has good selectivity toward H2O2. Additionally, the H2O2 recovery tests of the sensor in diluted milk solution signify its potential application in routine H2O2 analysis.
Highlights
The rapid and sensitive detection of H2O2 has attracted a lot of attention because of the applications of H2O2 in food [1], medicine [2], chemical industry [3], and environmental protection [4] as a common intermediate and oxidant, as well as its involvement in many biological events and intracellular pathways [5]
The X-ray diffraction (XRD) patterns of these nanocomposites prepared with different molar ratios of AgNO3 and Cu(NO3)2 are shown in Figure 2a, from which we can find that all the nanocomposites show the strong diffraction peaks of the cubic crystal structure of the Cu2O phase with fitted lattice parameter of a = 0.430 nm
With the molar ratio of nAgNO3:nCu(NO3)2 decreased, the intensity of the Ag peaks decreased obviously, which indicated that the Ag content in the nanocomposites was positively correlated with the amount of AgNO3 added
Summary
The rapid and sensitive detection of H2O2 has attracted a lot of attention because of the applications of H2O2 in food [1], medicine [2], chemical industry [3], and environmental protection [4] as a common intermediate and oxidant, as well as its involvement in many biological events and intracellular pathways [5]. Conventional techniques for H2O2 determination have been developed, such as titrimetry [6], colorimetry [7], chemiluminescence [8], fluorescence resonance energy transfer-based upconversion [9], chromatography [10], and electrochemical methods [11] Among these techniques, the electrochemical method is considered to be a prospective approach for its good selectivity, high sensitivity, and simple manipulation [4]. Catalytic active nanomaterials, including noble metals [15], transition metal oxides [16], and other transition metal compounds [17,18], thanks to their selectivity and high activity, have been widely used to construct nonenzyme H2O2 sensors
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