A portable molecularly imprinted polymer-modified microchip sensor for the rapid detection of perfluorooctanoic acidElectronic supplementary information (ESI) available: Experimental section, the fabrication process of the FR-4 Au chip electrode (Fig. S1); the equivalent circuit model of MIP-based sensor (Fig. S2); the lower magnified FE-SEM images of (a) Cu2O, (b) Cu2O@C and (c) Cu2O@C@NiCo2O4 (Fig. S3); (a) XPS survey spectrum of Cu2O@C@NiCo2O4. High resolution XPS spectra of (b) Cu 2p, (c) O 1s, (d) C 1s, (e) Ni 2p and (f) Co 2p in the Cu2O@C@NiCo2O4 (Fig. S4); CV of the Au electrode representing oxidative electro-polymerization of 10 mM o-PD in the absence and the presence of 1 mM PFOA in acetate buffer (pH = 5.8) and methanol (2 : 1, v/v) solution over 25 cycles at a scan rate of 200 mV s−1 (Fig. S5); the metallurgical microscope characterizations of (a) bare Au electrode, (b) initial electrode, (c) MIP-PFOA electrode, and (d) MIP electrode (Fig. S6); the detailed parameters of the FR-4 Au chip electrode (Table S1); comparison with other methods for the determination of PFOA and PFOS (Table S2); determination of PFOA in real seawater samples using the MIP-based chip sensor (Table S3). See DOI: https://doi.org/10.1039/d3an00653k

A portable molecularly imprinted polymer-modified microchip sensor for the rapid detection of perfluorooctanoic acidElectronic supplementary information (ESI) available: Experimental section, the fabrication process of the FR-4 Au chip electrode (Fig. S1); the equivalent circuit model of MIP-based sensor (Fig. S2); the lower magnified FE-SEM images of (a) Cu2O, (b) Cu2O@C and (c) Cu2O@C@NiCo2O4 (Fig. S3); (a) XPS survey spectrum of Cu2O@C@NiCo2O4. High resolution XPS spectra of (b) Cu 2p, (c) O 1s, (d) C 1s, (e) Ni 2p and (f) Co 2p in the Cu2O@C@NiCo2O4 (Fig. S4); CV of the Au electrode representing oxidative electro-polymerization of 10 mM o-PD in the absence and the presence of 1 mM PFOA in acetate buffer (pH = 5.8) and methanol (2 : 1, v/v) solution over 25 cycles at a scan rate of 200 mV s−1 (Fig. S5); the metallurgical microscope characterizations of (a) bare Au electrode, (b) initial electrode, (c) MIP-PFOA electrode, and (d) MIP electrode (Fig. S6); the detailed parameters of the FR-4 Au chip electrode (Table S1); comparison with other methods for the determination of PFOA and PFOS (Table S2); determination of PFOA in real seawater samples using the MIP-based chip sensor (Table S3). See DOI: https://doi.org/10.1039/d3an00653k