Detail publikace

Gold Nanostructured Surface for Electrochemical Sensing and Biosensing: Does Shape Matter?

DRBOHLAVOVÁ, J. KYNCLOVÁ, H. HRDÝ, R. PŘIKRYLOVÁ, K. SVATOŠ, V. HUBÁLEK, J.

Originální název

Gold Nanostructured Surface for Electrochemical Sensing and Biosensing: Does Shape Matter?

Anglický název

Gold Nanostructured Surface for Electrochemical Sensing and Biosensing: Does Shape Matter?

Jazyk

en

Originální abstrakt

The construction of an electrochemical sensor based on a gold working electrode modified with gold nanostructures was achieved by galvanic deposition into an anodic alumina nanoporous template. Two approaches were investigated to fabricate the nanostructures of various sizes and shapes. First, gold deposition was performed through a thin alumina template resulting in the production of nanorods. In the second approach, alumina pores were widened to form cup-shaped nanostructures. The detailed topography of the nanostructured surfaces was characterized by scanning electron microscopy. The lengths and the diameters of the nanostructures were anticipated to have a significant influence on the surface area and thus on the capacity to promote electron-transfer reactions. This dependence was investigated by electrochemical impedance spectroscopy and cyclic voltammetry. The functionalization of electrode surface with 11-mercaptoundecanoic acid provided a basis for further bonding with analytes. A modified Randles equivalent circuit model with a constant phase element was used to interpret the impedance spectra. The interfacial properties of the modified electrodes were also evaluated by cyclic voltammetry in the presence of the Fe(CN)(6)(3-/4-) redox couple as a probe. The results showed that the voltammetric behavior of the probe was influenced by surface modification. The accumulation of 11-mercaptoundecanoic acid on the nanostructured electrode surface did not result in the expected increase in charge-transfer resistance and the decreased capacitance, unlike the cup-shaped nanostructured electrode.

Anglický abstrakt

The construction of an electrochemical sensor based on a gold working electrode modified with gold nanostructures was achieved by galvanic deposition into an anodic alumina nanoporous template. Two approaches were investigated to fabricate the nanostructures of various sizes and shapes. First, gold deposition was performed through a thin alumina template resulting in the production of nanorods. In the second approach, alumina pores were widened to form cup-shaped nanostructures. The detailed topography of the nanostructured surfaces was characterized by scanning electron microscopy. The lengths and the diameters of the nanostructures were anticipated to have a significant influence on the surface area and thus on the capacity to promote electron-transfer reactions. This dependence was investigated by electrochemical impedance spectroscopy and cyclic voltammetry. The functionalization of electrode surface with 11-mercaptoundecanoic acid provided a basis for further bonding with analytes. A modified Randles equivalent circuit model with a constant phase element was used to interpret the impedance spectra. The interfacial properties of the modified electrodes were also evaluated by cyclic voltammetry in the presence of the Fe(CN)(6)(3-/4-) redox couple as a probe. The results showed that the voltammetric behavior of the probe was influenced by surface modification. The accumulation of 11-mercaptoundecanoic acid on the nanostructured electrode surface did not result in the expected increase in charge-transfer resistance and the decreased capacitance, unlike the cup-shaped nanostructured electrode.

Dokumenty

BibTex


@article{BUT118270,
  author="Jana {Drbohlavová} and Hana {Kynclová} and Radim {Hrdý} and Kateřina {Urbánková} and Vojtěch {Svatoš} and Jaromír {Hubálek}",
  title="Gold Nanostructured Surface for Electrochemical Sensing and Biosensing: Does Shape Matter?",
  annote="The construction of an electrochemical sensor based on a gold working electrode modified with gold nanostructures was achieved by galvanic deposition into an anodic alumina nanoporous template. Two approaches were investigated to fabricate the nanostructures of various sizes and shapes. First, gold deposition was performed through a thin alumina template resulting in the production of nanorods. In the second approach, alumina pores were widened to form cup-shaped nanostructures. The detailed topography of the nanostructured surfaces was characterized by scanning electron microscopy. The lengths and the diameters of the nanostructures were anticipated to have a significant influence on the surface area and thus on the capacity to promote electron-transfer reactions. This dependence was investigated by electrochemical impedance spectroscopy and cyclic voltammetry. The functionalization of electrode surface with 11-mercaptoundecanoic acid provided a basis for further bonding with analytes. A modified Randles equivalent circuit model with a constant phase element was used to interpret the impedance spectra. The interfacial properties of the modified electrodes were also evaluated by cyclic voltammetry in the presence of the Fe(CN)(6)(3-/4-) redox couple as a probe. The results showed that the voltammetric behavior of the probe was influenced by surface modification. The accumulation of 11-mercaptoundecanoic acid on the nanostructured electrode surface did not result in the expected increase in charge-transfer resistance and the decreased capacitance, unlike the cup-shaped nanostructured electrode.",
  address="TAYLOR & FRANCIS INC, 530 WALNUT STREET, STE 850, PHILADELPHIA, PA 19106 USA",
  chapter="118270",
  doi="10.1080/00032719.2015.1043662",
  howpublished="online",
  institution="TAYLOR & FRANCIS INC, 530 WALNUT STREET, STE 850, PHILADELPHIA, PA 19106 USA",
  number="1",
  volume="49",
  year="2016",
  month="january",
  pages="135--151",
  publisher="TAYLOR & FRANCIS INC, 530 WALNUT STREET, STE 850, PHILADELPHIA, PA 19106 USA",
  type="journal article in Web of Science"
}