An improved non-enzymatic hydrogen peroxide sensor based on europium functionalized inorganic hybrid material—Evaluation of optical and electrochemical properties

• Design of novel europium incorporated mesoporous material for H2O2 detection.
• Good analytical performance with non-interferent ability.
• A quick response time of <4 s and low detection limit of 0.5 μM.
• Successful detection of H2O2 in the presence of disinfectant samples.

We have studied the electrochemical and optical properties of europium; a rare-earth ion functionalized ordered hybrid mesoporous silica material and evaluated its potential application for a non-enzymatic hydrogen peroxide sensor. Europium ion was introduced into the organic-inorganic hybrid mesoporous channels through complexation method. The modifications were confirmed by FT-IR whereas; the structural and textural properties of mesoporous silica are evaluated using FE-SEM, FE-TEM, and nitrogen physisorption isothermal analysis. The optical properties such as the excitation and emission behavior of rare-earth ion introduced ordered mesoporous silica was investigated using photoluminescence spectroscopy. The material is also evaluated for its electrochemical properties by the way of sensing H2O2 in aqueous samples by using cyclic voltammetry and chronoamperometry. It showed a linear range between 1.0 and 1400 μM. The response time of 4 s is also observed with a detection limit of 0.5 μM. It showed a good reproducibility, high stability and anti-interference ability which are considered vital for any electrochemical applications. The results obtained were quite challenging and thus, it has been applied for the detection of hydrogen peroxide in the presence of commercial disinfectant sample with satisfying results.

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