Amperometric sensing based on glutathione protected Au25 nanoparticles and their pH dependent electrocatalytic activity

S. Senthil Kumar, Kyuju Kwak, Dongil Lee

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)


We report here the electrochemical behavior of quantum sized glutathione protected Au25 nanoclusters and their use in electrochemical sensing. The Au25 modified electrode was found to show excellent electrocatalytic activity towards the oxidation of ascorbic acid and dopamine over a wide linear range from 0.71 to 44.4μM. The modified electrode exhibited pH dependent electrocatalytic activity, which was attributed to the consequence of electrostatic attraction/repulsion between the charged Au25 clusters and the charged analytes at different pH. This result demonstrates the feasibility of enhancing the sensing selectivity among the charged analytes by controlling the charges on the clusters.

Original languageEnglish
Pages (from-to)2116-2124
Number of pages9
Issue number9
Publication statusPublished - 2011 Sep

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Electrochemistry


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