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P-Type NiO foam with rough nanostructured surface was prepared by the surface treatment of Ni foam,and then it was decorated with n-type ZnO nanopyramids to construct a 3D p–n junction foam. The p–n junction foam was used for electrochemical detection of dopamine and the sensing performance was improved significantly compared with the single NiO and ZnO. High sensitivity(171 mμA/mmol/L), fast response(2 s), excellent selectivity and stability were achieved. It was attributed to the introduction of numerous p–n junction interfaces, the interfacial potential barrier played as a tuning factor for the electrochemical determination of dopamine. The results demonstrated it would be an important way to improve the biosensing performance by introducing the p–n junction interfaces.
P-Type NiO foam with rough nanostructured surface was prepared by the surface treatment of Ni foam, and then it was decorated with n-type ZnO nanopyramids to construct a 3D p-n junction foam. The p-n junction foam was used for electrochemical detection of dopamine and the sensing performance was improved significantly with the single NiO and ZnO. High sensitivity (171 mμA / mmol / L), fast response (2 s), excellent selectivity and stability were achieved. It was attributed to the introduction of numerous p-n junction interfaces, the interfacial potential barrier played a tuning factor for the electrochemical determination of dopamine. The results said it would be an important way to improve the biosensing performance by introducing the p-n junction interfaces.