Abstract
The CuO inverse opal photonic crystals (IOPCs) were synthesized by the sol-gel method and modified with CdS quantum dots by successive ionic layer adsorption and reaction (SILAR). CdS QDs modified CuO IOPCs FTO electrodes of different SILAR cycles were fabricated and their electrochemical properties were studied by cyclic voltammetry (CV) and chronoamperometry (I–t). Structure and morphology of the samples were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), high-resolution TEM (HRTEM), Energy-dispersive X-ray analysis (EDX) and X-ray diffraction pattern (XRD). The result indicated that the structure of IOPCs and loading of CdS QDs could greatly improve the electrochemical properties. Three SILAR cycles of CdS QDs sensitization was the optimum condition for preparing electrodes, it exhibited a sensitivity of 4345 μA mM-1 cm-2 to glucose with a 0.15 μM detection limit (S/N= 3) and a linear range from 0.15 μM to 0.5 mM under a working potential of +0.7 V. It also showed strong stability, good reproducibility, excellent selectivity and fast amperometric response. This work provides a promising approach for realizing excellent photoelectrochemical nonenzymatic glucose biosensor of similar composite structure.
Highlights
Determination of glucose with the help of glucose biosensors is a widely investigated and well developed field, due to its various important applications in clinical detection, biological analysis, environmental monitoring and food industry[1,2,3]
We report the preparation, characterization and properties of a novel and innovative electrode design which involves the beneficial combination of CuO inverse opal photonic crystals (IOPCs) with cadmium sulfide (CdS) quantum dots (QDs) sensitization
CuO IOPCs Fluorine-doped tin oxide (FTO) electrodes consists of four simple steps, as illustrated in Fig. 1a: 1) self-assembly of close-packed polymethyl methacrylate (PMMA) spheres with multilayer structures onto FTO substrates, 2) infiltration of PMMA template with prepared precursor solution of CuO by sol-gel method, 3) removal of the original PMMA template by high temperature annealing to obtain CuO IOPCs, and 4) final sensitization of the CuO IOPCs with CdS QDs using successive ionic layer adsorption and reaction (SILAR) route
Summary
CuO inverse opal electrodes for received: 11 January 2015 accepted: 15 April 2015 Published: 04 June 2015 ultrasensitive electrochemical and photoelectrochemical biosensor. Three SILAR cycles of CdS QDs sensitization was the optimum condition for preparing electrodes, it exhibited a sensitivity of 4345 μ A mM-1 cm-2 to glucose with a 0.15 μ M detection limit (S/N= 3) and a linear range from 0.15 μ M to 0.5 mM under a working potential of + 0.7 V It showed strong stability, good reproducibility, excellent selectivity and fast amperometric response. Some metal oxides are being increasingly used in non-enzymatic glucose biosensor applications due to their low cost, excellent electrochemical properties and higher sensitivity Among these materials, one of the most highly investigated oxides is copper oxide CuO, which is a p-type semiconductor with a narrow band gap of 1.34 eV. In order to obtain visible light absorption and better photoelectrochemical properties, we further modified the CuO IOPCs by incorporating cadmium sulfide (CdS) quantum dots (QDs) on the electrode surface. We report the preparation, characterization and properties of a novel and innovative electrode design which involves the beneficial combination of CuO IOPCs with CdS QDs sensitization
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