A novel electrochemical sensor based on a graphene oxide(GO)/three-dimensional(3D)hierarchical zinc oxide(ZnO)nanocomposite was developed for the efficient determination of the antibiotic drug chloramphenicol(CAP).The...A novel electrochemical sensor based on a graphene oxide(GO)/three-dimensional(3D)hierarchical zinc oxide(ZnO)nanocomposite was developed for the efficient determination of the antibiotic drug chloramphenicol(CAP).The hierarchical ZnO structure consisting of nanosheets was synthesized by a green aqueous solution procedure and then composited with GO through a simple sonochemical method.The synthesized ZnO and GO/ZnO nanomaterials were characterized by scanning electron microscopy(SEM),elemental mapping,X-ray diffraction(XRD),UV-Visible spectroscopy,Fourier transform infrared spectroscopy(FT-IR),and Raman spectroscopy.The electrochemical performance of the prepared GO/ZnO/glassy carbon electrode(GCE)was evaluated using cyclic voltammetry(CV)and differential pulse voltammetry(DPV)techniques.The GO/ZnO/GCE shows a low CAP detection limit of 0.01μM,a high sensitivity of 7.27μAμM^(−1) cm^(−2),and a linear response in the range of 0.2 to 7.2μM.Moreover,it exhibits excellent stability,reproducibility and repeatability.Practicality of the sensor has further been demonstrated with honey,milk and eye drop samples.展开更多
In this paper,a novel electrochemical sensor based on a functionalized multi-walled carbon nanotube(f-MWCNT)decorated ruskin michelle-like zinc oxide(ZnO)nanocomposite for the determination of the environmental pollut...In this paper,a novel electrochemical sensor based on a functionalized multi-walled carbon nanotube(f-MWCNT)decorated ruskin michelle-like zinc oxide(ZnO)nanocomposite for the determination of the environmental pollutant hydroquinone(HQ)is reported.We have followed a new aqueous solution method for the synthesis of ruskin michelle-like ZnO nanoparticles and they are characterized by scanning electron microscopy(SEM),X-ray diffraction(XRD),Raman spectroscopy,Fourier transform infrared(FT-IR)spectroscopy and UV visible spectroscopy.Cyclic voltammetry(CV),differential pulse voltammetry(DPV)and amperometric techniques are used for the electrochemical analysis of a f-MWCNT decorated ruskin michelle-like ZnO nanocomposite modified glassy carbon electrode(GCE).The fabricated f-MWCNT/ZnO GCE showcased excellent electrocatalytic activity in the determination of HQ and we obtained a sharp anodic and cathodic peak current at a low potential value of 0.11 V and 0.05 V,respectively.Efficient reproducibility and stability,anti-interference property and good repeatability,which are the traits of a good electrochemical sensor,are exhibited by the fabricated sensor.We have obtained a very low limit of detection(LOD)for the fabricated f-MWCNT/ZnO GCE of 0.02μM,a linear response in the range of 0.1-190μM and a sensitivity of 6.37μAμM^(-1)cm^(-2).These results obtained from the electrochemical analysis reveal the excellent performance of the f-MWCNT decorated ruskin michelle-like ZnO nanocomposite modified GCE in the effective determination of HQ.展开更多
基金supported by the Ministry of Science and Technology,Taiwan,ROC under the grant MOST 106-2221-E-027-107.
文摘A novel electrochemical sensor based on a graphene oxide(GO)/three-dimensional(3D)hierarchical zinc oxide(ZnO)nanocomposite was developed for the efficient determination of the antibiotic drug chloramphenicol(CAP).The hierarchical ZnO structure consisting of nanosheets was synthesized by a green aqueous solution procedure and then composited with GO through a simple sonochemical method.The synthesized ZnO and GO/ZnO nanomaterials were characterized by scanning electron microscopy(SEM),elemental mapping,X-ray diffraction(XRD),UV-Visible spectroscopy,Fourier transform infrared spectroscopy(FT-IR),and Raman spectroscopy.The electrochemical performance of the prepared GO/ZnO/glassy carbon electrode(GCE)was evaluated using cyclic voltammetry(CV)and differential pulse voltammetry(DPV)techniques.The GO/ZnO/GCE shows a low CAP detection limit of 0.01μM,a high sensitivity of 7.27μAμM^(−1) cm^(−2),and a linear response in the range of 0.2 to 7.2μM.Moreover,it exhibits excellent stability,reproducibility and repeatability.Practicality of the sensor has further been demonstrated with honey,milk and eye drop samples.
基金supported by the Ministry of Science and Technology,ROC,under grant no.105-2221-E-027-061.
文摘In this paper,a novel electrochemical sensor based on a functionalized multi-walled carbon nanotube(f-MWCNT)decorated ruskin michelle-like zinc oxide(ZnO)nanocomposite for the determination of the environmental pollutant hydroquinone(HQ)is reported.We have followed a new aqueous solution method for the synthesis of ruskin michelle-like ZnO nanoparticles and they are characterized by scanning electron microscopy(SEM),X-ray diffraction(XRD),Raman spectroscopy,Fourier transform infrared(FT-IR)spectroscopy and UV visible spectroscopy.Cyclic voltammetry(CV),differential pulse voltammetry(DPV)and amperometric techniques are used for the electrochemical analysis of a f-MWCNT decorated ruskin michelle-like ZnO nanocomposite modified glassy carbon electrode(GCE).The fabricated f-MWCNT/ZnO GCE showcased excellent electrocatalytic activity in the determination of HQ and we obtained a sharp anodic and cathodic peak current at a low potential value of 0.11 V and 0.05 V,respectively.Efficient reproducibility and stability,anti-interference property and good repeatability,which are the traits of a good electrochemical sensor,are exhibited by the fabricated sensor.We have obtained a very low limit of detection(LOD)for the fabricated f-MWCNT/ZnO GCE of 0.02μM,a linear response in the range of 0.1-190μM and a sensitivity of 6.37μAμM^(-1)cm^(-2).These results obtained from the electrochemical analysis reveal the excellent performance of the f-MWCNT decorated ruskin michelle-like ZnO nanocomposite modified GCE in the effective determination of HQ.
