Laser-induced graphene anchored with PtCoCu ternary nanoalloy: Electronic synergy-enabled sensitive H2O2 sensing in food matrices.

Reliable and sensitive detection of H2O2 is critical in food safety. Herein, we constructed a novel electrochemical sensor based on laser induced graphene anchored with PtCoCu nanoalloy (PtCoCu/LIG) for H2O2 detection. The PtCoCu/LIG was prepared via a two-step laser direct writing process: LIG was first generated on a polyimide substrate, followed by dip-coating and electrodeposition to obtain Pt/CoCu-ZIF/LIG, then converted into PtCoCu/LIG by a second laser irradiation. Experimental and DFT results reveal that the synergistic effect between PtCoCu and LIG, together with the electronic modulation by Pt, endows the sensor with strong electrocatalytic activity, superior conductivity, and satisfactory sensing performance. Thus, PtCoCu/LIG exhibits a high sensitivity of 0.163 μA μM-1 cm-2, a low detection limit of 0.67 μM, and robust selectivity and stability. The reliability of this method was validated in spiced peanut, milk, vitamin drinks, orange juice, and honey samples, offering a promising detection strategy for food matrices.