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PtCu3 excavated rhombic dodecahedral nanocrystals with excellent peroxidase-like activity for highly sensitive
Yameng Xie1, Yangzheng Xu1, Hui Su1
1State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
Abstract:
Nanozymes have emerged as a forefront area in analytical sensing research, especially for the sensitive detection of nitrite, which is essential for human health. We synthesized PtCu3 rhombic dodecahedral nanocrystals (ERD NCs) via a two-step Cu-seeding method. TEM confirms that these NCs are consist of ultra-thin nanosheets with a thickness of approximately 2.8 nm, resulting in higher atomic utilization efficiency. Kinetic tests reveal that PtCu₃ ERD NCs exhibit excellent peroxidase-like activity. XPS valence band spectra demonstrate that the formation of the alloy causes a shift in the d-band center, which significantly facilitate the adsorption of H2O2 and its decomposition into hydroxyl radicals. Based on these findings, we have developed a colorimetric platform for the quantitative detection of nitrite. This platform can effectively detect nitrite in the concentration range of 5-500 μM in real samples, which is of great value for the detection of nitrite in food.
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