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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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Scheme for electrode preparation. (a) Flow sheet for the preparation of the PEDOT-PtNPs/SPC electrode. (b) The photograph of the SPC electrode.
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Figure 1: Scheme for electrode preparation. (a) Flow sheet for the preparation of the PEDOT-PtNPs/SPC electrode. (b) The photograph of the SPC electrode.

Mentions: The synthesis of PEDOT-PtNP composite was carried out by putting a glass bottle, containing 0.01 M of EDOT monomer and 0.001 M of H2PtCl6 aqueous solution, in a photochemical reactor (Panchum Scientific Corp., Taiwan) followed by irradiation with UV light (power density, 0.14 W cm−2; main wavelength, 365 nm) for a specific period of time under forced air convection and mild agitation. As the reaction proceeded, a black-colored suspension was obtained. After UV irradiation, the glass bottle containing black suspension was removed from the photochemical reactor and kept in the dark place at room temperature over 2 days for the precipitation of the composite; after which, the supernatant was removed, and the precipitate was subjected to vacuum dried at 90°C. After being dried, the precipitate was dispersed in DMSO solution at a concentration of 1.0 mg mL−1. To prepare the PEDOT-PtNPs/SPC electrode, 1.0 μL of the dispersion was drop-coated onto the SPC electrode, and the coated SPC electrode was dried at 60°C. The scheme of the preparation of PEDOT-PtNPs/SPC electrode is showed in Figure 1.


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)

Scheme for electrode preparation. (a) Flow sheet for the preparation of the PEDOT-PtNPs/SPC electrode. (b) The photograph of the SPC electrode.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 1: Scheme for electrode preparation. (a) Flow sheet for the preparation of the PEDOT-PtNPs/SPC electrode. (b) The photograph of the SPC electrode.
Mentions: The synthesis of PEDOT-PtNP composite was carried out by putting a glass bottle, containing 0.01 M of EDOT monomer and 0.001 M of H2PtCl6 aqueous solution, in a photochemical reactor (Panchum Scientific Corp., Taiwan) followed by irradiation with UV light (power density, 0.14 W cm−2; main wavelength, 365 nm) for a specific period of time under forced air convection and mild agitation. As the reaction proceeded, a black-colored suspension was obtained. After UV irradiation, the glass bottle containing black suspension was removed from the photochemical reactor and kept in the dark place at room temperature over 2 days for the precipitation of the composite; after which, the supernatant was removed, and the precipitate was subjected to vacuum dried at 90°C. After being dried, the precipitate was dispersed in DMSO solution at a concentration of 1.0 mg mL−1. To prepare the PEDOT-PtNPs/SPC electrode, 1.0 μL of the dispersion was drop-coated onto the SPC electrode, and the coated SPC electrode was dried at 60°C. The scheme of the preparation of PEDOT-PtNPs/SPC electrode is showed in Figure 1.

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