Nanocomposite comprising gold nanoparticles and polyaniline nanofibers via one-step synthesis for sensing hydrogen peroxide

Autor: Yu-hsiang Chen, 陳禹翔
Rok vydání: 2008
Druh dokumentu: 學位論文 ; thesis
Popis: 96
The first part of the the dissertation is on the characterization of the nanocomposite comprising gold nanoparticles and polyaniline nanofibers. Au nanoparticles were generated along with the simultaneous formation of polyaniline(PANI)nanofibers using interfacial polymerization route. Scanning electron microscopic(SEM)revealed that PANI possesses nanofiber structure. The nanofiber structure of PANI acts as not only reducing agent but also matrix to prevent the aggregation of gold nanoparticles. Transmission electron microscopic(TEM)results revealed that particle size of gold nanoparticles is at ca. 10-30 nm which is consistent with the result from the calculation by x-ray diffraction pattern (XRD). X-ray photoelectron spectroscopy(XPS)and Fourier transform infrared spectroscopy(FTIR)results showed that there were more side products and higher oxidized states for the nanocomposite synthesized by using HAuCl4 as oxidant. On the second part of the dissertation, we extended our work to study the electrochemical sensing properties of the prepared nanocomposite for hydrogen peroxide. The nanocomposite comprising gold nanoparticles and PANI nanofibers possess the sensing ability for hydrogen peroxide. Furthermore, the optimal operation of the nanocomposite for sensing hydrogen peroxide is at pH 7.5. The hydrogen peroxide sensor shows a linear calibration curve over the range from 2.5×10-7 to 2×10-3 M, with a slope and detection limit(S/N=3)of 9.53 μA/mM and 2.5×10-7 M, respectively. In addition, the hydrogen peroxide sensor possesses a fast response time(6 sec)for sensing hydrogen peroxide.
Databáze: Networked Digital Library of Theses & Dissertations