Limits...
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.


Related in: MedlinePlus

UV-vis spectra. UV-vis spectra of the solution containing PEDOT/PtNP composite prepared (a) without and (b) with UV-irradiation for various periods. The absorbances in the range from 400 to 1200 nm are enlarged for both samples and shown as insets in (a) and (b).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC3475046&req=5

Figure 2: UV-vis spectra. UV-vis spectra of the solution containing PEDOT/PtNP composite prepared (a) without and (b) with UV-irradiation for various periods. The absorbances in the range from 400 to 1200 nm are enlarged for both samples and shown as insets in (a) and (b).

Mentions: Figure 2 shows the UV-vis spectra of the PEDOT-PtNP composite prepared with and without UV irradiation for various periods. The UV-vis spectra were recorded using PEDOT-PtNP composite dispersion prepared by dispersing a 0.1 mL of the reaction solution in the DMSO solvent with the help of sonication. It can be found that the absorbances at wavelengths between 310 and 380 nm, and at wavelengths higher than 700 nm increased monotonically during the time course of the reaction. The increase in the absorbance at wavelengths higher than 700 nm was assigned to the polymerization of EDOT [31]. Therefore, the polymerization rate of EDOT film was catalyzed in presence of UV irradiation as evidenced by observing a faster increase in the absorbance at wavelengths higher than 700 nm. In addition, the increase in absorbance at wavelengths between 310 and 380 nm was assigned to the formation of Pt2+[32]. As a result, it was inferred that the polymerization of EDOT was accompanied by the reduction of Pt4+ to Pt2+, and then to Pt. The kinetics of the polymerization also affected the morphology of the prepared PtNPs. As revealed in Figure 3, PtNPs with smaller size were obtained under UV irradiation, which can be attributed to the faster nucleation rate of PtNPs.


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)

UV-vis spectra. UV-vis spectra of the solution containing PEDOT/PtNP composite prepared (a) without and (b) with UV-irradiation for various periods. The absorbances in the range from 400 to 1200 nm are enlarged for both samples and shown as insets in (a) and (b).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 2: UV-vis spectra. UV-vis spectra of the solution containing PEDOT/PtNP composite prepared (a) without and (b) with UV-irradiation for various periods. The absorbances in the range from 400 to 1200 nm are enlarged for both samples and shown as insets in (a) and (b).
Mentions: Figure 2 shows the UV-vis spectra of the PEDOT-PtNP composite prepared with and without UV irradiation for various periods. The UV-vis spectra were recorded using PEDOT-PtNP composite dispersion prepared by dispersing a 0.1 mL of the reaction solution in the DMSO solvent with the help of sonication. It can be found that the absorbances at wavelengths between 310 and 380 nm, and at wavelengths higher than 700 nm increased monotonically during the time course of the reaction. The increase in the absorbance at wavelengths higher than 700 nm was assigned to the polymerization of EDOT [31]. Therefore, the polymerization rate of EDOT film was catalyzed in presence of UV irradiation as evidenced by observing a faster increase in the absorbance at wavelengths higher than 700 nm. In addition, the increase in absorbance at wavelengths between 310 and 380 nm was assigned to the formation of Pt2+[32]. As a result, it was inferred that the polymerization of EDOT was accompanied by the reduction of Pt4+ to Pt2+, and then to Pt. The kinetics of the polymerization also affected the morphology of the prepared PtNPs. As revealed in Figure 3, PtNPs with smaller size were obtained under UV irradiation, which can be attributed to the faster nucleation rate of PtNPs.

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