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2015 ; 5
(ä): 10838
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CdS quantum dots modified CuO inverse opal electrodes for ultrasensitive
electrochemical and photoelectrochemical biosensor
#MMPMID26042520
Xia L
; Xu L
; Song J
; Xu R
; Liu D
; Dong B
; Song H
Sci Rep
2015[Jun]; 5
(ä): 10838
PMID26042520
show ga
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??A mM(-1) cm(-2) to glucose with a 0.15??M detection limit
(S/N= 3) and a linear range from 0.15??M 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.