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One-pot synthesis of poly (3,4-ethylenedioxythiophene)-Pt nanoparticle composite and its application to electrochemical H2O2 sensor.

Chang LC, Wu HN, Lin CY, Lai YH, Hu CW, Ho KC - Nanoscale Res Lett (2012)

Bottom Line: The immobilized PtNPs showed excellent electrocatalytic activities towards the electroreduction of hydrogen peroxide.The resultant amperometric sensor showed enhanced sensitivity for the detection of H2O2 as compared to that without PtNPs, i.e., only with a layer of PEDOT.Sensing properties of the modified electrode were studied both by CV and amperometric analysis.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Chemical Engineering, National Taiwan University, Taipei, 10617, Taiwan. kcho@ntu.edu.tw.

ABSTRACT
Poly(3,4-ethylenedioxythiophene)-Pt nanoparticle composite was synthesized in one-pot fashion using a photo-assisted chemical method, and its electrocatalytic properties toward hydrogen peroxide (H2O2) was investigated. Under UV irradiation, the rates of the oxidative polymerization of EDOT monomer along with the reduction of Pt4+ ions were accelerated. In addition, the morphology of PtNPs was also greatly influenced by the UV irradiation; the size of PtNPs was reduced under UV irradiation, which can be attributed to the faster nucleation rate. The immobilized PtNPs showed excellent electrocatalytic activities towards the electroreduction of hydrogen peroxide. The resultant amperometric sensor showed enhanced sensitivity for the detection of H2O2 as compared to that without PtNPs, i.e., only with a layer of PEDOT. Amperometric determination of H2O2 at -0.55 V gave a limit of detection of 1.6 μM (S / N = 3) and a sensitivity of 19.29 mA cm-2 M-1 up to 6 mM, with a response time (steady state, t95) of 30 to 40 s. Energy dispersive X-ray analysis, transmission electron microscopic image, cyclic voltammetry (CV), and scanning electron microscopic images were utilized to characterize the modified electrode. Sensing properties of the modified electrode were studied both by CV and amperometric analysis.

No MeSH data available.


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Amperometric diagram. The amperometric current responses of the PEDOT-PtNPs/SPC electrode in response to various H2O2 concentrations, ranging from 0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5 to 6 mM, in 0.1 M PBS solution (pH 7.4) at the applied potential of −0.6 V (vs. Ag/AgCl/KCl saturated). The inset shows the calibration curve for H2O2.
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Figure 7: Amperometric diagram. The amperometric current responses of the PEDOT-PtNPs/SPC electrode in response to various H2O2 concentrations, ranging from 0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5 to 6 mM, in 0.1 M PBS solution (pH 7.4) at the applied potential of −0.6 V (vs. Ag/AgCl/KCl saturated). The inset shows the calibration curve for H2O2.

Mentions: Figure 7 shows the transient current densities at various H2O2 concentrations. The current density responses of the PEDOT-PtNPs/SPC electrode as a function of the H2O2 concentration, with a sampling time of 200 s at each concentration level, are measured and shown in Figure 7. The current density increases linearly with the increased H2O2 concentration up to 6 mM. The sensitivity and detection limit (S / N = 3) for the PEDOT-PtNPs/SPC electrode are 19.29 mA cm−2 M−1 and of 1.6 μM, respectively.


One-pot synthesis of poly (3,4-ethylenedioxythiophene)-Pt nanoparticle composite and its application to electrochemical H2O2 sensor.

Chang LC, Wu HN, Lin CY, Lai YH, Hu CW, Ho KC - Nanoscale Res Lett (2012)

Amperometric diagram. The amperometric current responses of the PEDOT-PtNPs/SPC electrode in response to various H2O2 concentrations, ranging from 0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5 to 6 mM, in 0.1 M PBS solution (pH 7.4) at the applied potential of −0.6 V (vs. Ag/AgCl/KCl saturated). The inset shows the calibration curve for H2O2.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3475046&req=5

Figure 7: Amperometric diagram. The amperometric current responses of the PEDOT-PtNPs/SPC electrode in response to various H2O2 concentrations, ranging from 0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5 to 6 mM, in 0.1 M PBS solution (pH 7.4) at the applied potential of −0.6 V (vs. Ag/AgCl/KCl saturated). The inset shows the calibration curve for H2O2.
Mentions: Figure 7 shows the transient current densities at various H2O2 concentrations. The current density responses of the PEDOT-PtNPs/SPC electrode as a function of the H2O2 concentration, with a sampling time of 200 s at each concentration level, are measured and shown in Figure 7. The current density increases linearly with the increased H2O2 concentration up to 6 mM. The sensitivity and detection limit (S / N = 3) for the PEDOT-PtNPs/SPC electrode are 19.29 mA cm−2 M−1 and of 1.6 μM, respectively.

Bottom Line: The immobilized PtNPs showed excellent electrocatalytic activities towards the electroreduction of hydrogen peroxide.The resultant amperometric sensor showed enhanced sensitivity for the detection of H2O2 as compared to that without PtNPs, i.e., only with a layer of PEDOT.Sensing properties of the modified electrode were studied both by CV and amperometric analysis.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Chemical Engineering, National Taiwan University, Taipei, 10617, Taiwan. kcho@ntu.edu.tw.

ABSTRACT
Poly(3,4-ethylenedioxythiophene)-Pt nanoparticle composite was synthesized in one-pot fashion using a photo-assisted chemical method, and its electrocatalytic properties toward hydrogen peroxide (H2O2) was investigated. Under UV irradiation, the rates of the oxidative polymerization of EDOT monomer along with the reduction of Pt4+ ions were accelerated. In addition, the morphology of PtNPs was also greatly influenced by the UV irradiation; the size of PtNPs was reduced under UV irradiation, which can be attributed to the faster nucleation rate. The immobilized PtNPs showed excellent electrocatalytic activities towards the electroreduction of hydrogen peroxide. The resultant amperometric sensor showed enhanced sensitivity for the detection of H2O2 as compared to that without PtNPs, i.e., only with a layer of PEDOT. Amperometric determination of H2O2 at -0.55 V gave a limit of detection of 1.6 μM (S / N = 3) and a sensitivity of 19.29 mA cm-2 M-1 up to 6 mM, with a response time (steady state, t95) of 30 to 40 s. Energy dispersive X-ray analysis, transmission electron microscopic image, cyclic voltammetry (CV), and scanning electron microscopic images were utilized to characterize the modified electrode. Sensing properties of the modified electrode were studied both by CV and amperometric analysis.

No MeSH data available.


Related in: MedlinePlus