A porous sphere of CuO@SiO₂ was obtained by simple calcination of the copper silicate (CuSiO₃) sphere. The formation of the porous sphere was studied in detail with the support of various physical characterization techniques. The CuO@SiO₂ was coated on an electrode surface where it demonstrates high catalytic activity for the electro-oxidation of vanillin in phosphate buffer solution (PBS; pH 7.0). The modified electrode has good surface adsorption (1.861 × 10⁻¹⁰ mol cm⁻²) and rate constant (2.866 × 10⁵ cm³ mol⁻¹ s⁻¹) characteristics for vanillin detection. The CuO@SiO₂-modified surface exhibited good linear range (0.05 μM–1.2 μM and 6.2 to 111.2 μM), detection limit (53 nM), sensitivity (2.88 μA μM⁻¹ cm⁻²), selectivity, stability, and reproducibility. The CuO@SiO₂-modified electrode was further examined for the determination of vanillin in real samples including biscuits and chocolates with satisfactory recoveries.

通过简单煅烧硅酸铜 (CuSiO ₃ ) 球体，可以得到CuO@SiO ₂多孔球体。在各种物理表征技术的支持下，对多孔球的形成进行了详细研究。CuO@SiO ₂涂覆在电极表面上，在磷酸盐缓冲溶液（PBS；pH 7.0）中，它对香草醛的电氧化表现出高催化活性。修饰电极具有良好的表面吸附（1.861 × 10 ^-10 mol cm ^-2）和速率常数（2.866 × 10 ⁵ cm ³ mol ^-1 s ^-1）特性，用于香草醛检测。CuO@SiO ₂修饰的表面表现出良好的线性范围（0.05 μM–1.2 μM 和 6.2 到 111.2 μM）、检测限（53 nM）、灵敏度（2.88 μA μM ^-1 cm ^-2）、选择性、稳定性和重现性。CuO@SiO ₂修饰的电极进一步用于测定饼干和巧克力等实际样品中香兰素的含量，回收率令人满意。