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Platinum nanoparticles were employed to modify the surface of copper-core electrode in order to improve electrochemical response signal. The homemade electrode displayed efficient electrocatalytic reduction activity towards dissolved oxygen. The sensor responded linearly to dissolved oxygen in the range of 10\u2009<jats:italic>\u03bc<\/jats:italic>M to 0.195\u2009mM and had a remarkable sensitivity of 9.02\u2009<jats:italic>\u03bc<\/jats:italic>A\/mM. In addition, it showed an excellent reproducibility, stability, and selectivity. These results indicated that the needle microsensor when used, could yield good performance. 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