electrochemical sensor

electrochemical sensing

gas sensing

linear range

metal oxide

gas sensor

Sensors and Actuators B Chemical

• A MIP electrochemical sensor based on the hierarchical NiCo 2 O 4 @ZnO/ZnCo 2 O 4 composite was constructed for detection of PCNB. • The NiCo 2 O 4 @ZnO/ZnCo 2 O 4 p-n heterojunction composed of p-type semiconductor NiCo 2 O 4 and ZnCo 2 O 4 and n-type semiconductor ZnO. • The p-n heterojunction can enhance the electrochemical sensing performance of pentachloronitrobenzene. • The proposed MIP/NiCo 2 O 4 @ZnO/ZnCo 2 O 4 /GCE sensing system has the advantages of high selectivity and high sensitivity. In this work, we developed a hierarchical structure and multi-component synergistic metal oxide hybrid material, and explored its practical application in monitoring pentachloronitrobenzene (PCNB). We used the ZnO/ZnCo 2 O 4 , obtained by calcining Zn-Co Prussian blue analogue (PBA), as the substrate and integrated Ni-Co layered double hydroxide (LDH) on its surface and calcined to obtain hierarchical NiCo 2 O 4 @ZnO/ZnCo 2 O 4 microspheres (MSs). Due to the p-n heterojunction characteristics of p-type semiconductor NiCo 2 O 4 and ZnCo 2 O 4 and n-type semiconductor ZnO and the high specific surface area of the microspheres supported by the hierarchical structure conductive network, when this material was used to modify the glassy carbon electrode (GCE), it significantly enhanced the electrochemical sensing performance towards PCNB. Therefore, a new type of electrochemical sensor was constructed based on NiCo 2 O 4 @ZnO/ZnCo 2 O 4 MSs and molecularly imprinted polymer (MIP) for the sensitive and highly selective detection of PCNB. Among them, the MIP membrane was fabricated by cyclic voltammetry (CV), and differential pulse voltammetry (DPV) was used to detect PCNB. Under the optimum conditions, the reduction peak current density of PCNB was linearly related to the concentration from 0.05 to 5.5 μM with a detection limit of 8.33 nM and a good sensitivity of 6.118 μA⋅μM − ¹⋅cm − ². Furthermore, the proposed MIP sensor exhibited high selectivity, reproducibility, repeatability, and stability, and had been used for the ...

Ni-Co-LDH and Zn-Co Prussian blue analogue derived hierarchical NiCo2O4@ZnO/ZnCo2O4 microspheres with enhanced electrochemical sensing performance towards pentachloronitrobenzene