Electrochemical sensing of hydroxylamine by gold nanoparticles on single-walled carbon nanotube films

Minh Phuong Ngoc Bui, Xuan Hung Pham, Kwi Nam Han, Cheng Ai Li, Eun Kyu Lee, Ho Jung Chang, Gi Hun Seong

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

The arrays of gold nanoparticles (AuNPs) were fabricated on flexible and transparent single-walled carbon nanotube (SWCNT) films using the electrochemical deposition method, and the patterned nanotubes were then used as electrodes for hydroxylamine detection. The sizes and densities of the AuNPs could easily be controlled by varying the amount of charge deposited, and the gold-deposited area showed a homogeneous distribution on the exposed SWCNT film surface. X-ray diffraction analysis of the AuNPs shows a face-centered cubic structure that is dominated by the lowest energy {111} facets. The oxidation of the hydroxylamine on the AuNP-deposited SWCNT films depended strongly on the solution pH, and the maximum catalytic current was observed at a pH of 9.0. A linear electrical response was observed for concentrations ranging from 0.016 to 0.210 mM, and the detection limit and the sensitivity were 0.72 μM and 165.90 μAmM-1 cm-2, respectively. Moreover, the amperometric response in hydroxylamine showed a stable response for a long time (300 s), during which time it retained 94% of its initial value. In the long-term storage stability test, the current response to hydroxylamine decreased slightly, with only 17% leakage after 30 days.

Original languageEnglish (US)
Pages (from-to)250-253
Number of pages4
JournalElectrochemistry Communications
Volume12
Issue number2
DOIs
StatePublished - Feb 2010

Keywords

  • Electrochemical deposition
  • Electrochemical detection
  • Gold nanoparticles
  • Hydroxylamine
  • Single-walled carbon nanotube

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