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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.

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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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XPS spectrum. The Pt 4f XPS spectrum of the PEDOT-PtNP composite synthesized under UV irradiation for 80 min.
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Figure 4: XPS spectrum. The Pt 4f XPS spectrum of the PEDOT-PtNP composite synthesized under UV irradiation for 80 min.

Mentions: The formation of metallic PtNPs from chloroplatinic acid hydrate was further confirmed by XPS analysis. As revealed in Figure 4, the Pt 4f spectrum consists of a spin-split double, i.e., Pt 4f7/2 (71.4 eV) and 4f5/2 (74.9 eV), which is consistent with the presence of metallic oxidation state of Pt [33].


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)

XPS spectrum. The Pt 4f XPS spectrum of the PEDOT-PtNP composite synthesized under UV irradiation for 80 min.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 4: XPS spectrum. The Pt 4f XPS spectrum of the PEDOT-PtNP composite synthesized under UV irradiation for 80 min.
Mentions: The formation of metallic PtNPs from chloroplatinic acid hydrate was further confirmed by XPS analysis. As revealed in Figure 4, the Pt 4f spectrum consists of a spin-split double, i.e., Pt 4f7/2 (71.4 eV) and 4f5/2 (74.9 eV), which is consistent with the presence of metallic oxidation state of Pt [33].

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