Nanodiamond-Gold Nanocomposites with the Peroxidase-Like Oxidative Catalytic Activity

Min Chul Kim, Dukhee Lee, Seong Hoon Jeong, Sang Yup Lee, Eunah Kang

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

Novel nanodiamond-gold nanocomposites (NDAus) are prepared, and their oxidative catalytic activity is examined. Gold nanoparticles are deposited on carboxylated nanodiamonds (NDs) by in situ chemical reduction of gold precursor ions to produce NDAus, which exhibit catalytic activity for the oxidation of o-phenylenediamine in the presence of hydrogen peroxide similarly to a peroxidase. This remarkable catalytic activity is exhibited only by the gold nanoparticle-decorated NDs and is not observed for either Au nanoparticles or NDs separately. Kinetic oxidative catalysis studies show that NDAus exhibit a ping-pong mechanism with an activation energy of 93.3 kJ mol-1, with the oxidation reaction rate being proportional to the substrate concentration. NDAus retain considerable activity even after several instances of reuse and are compatible with a natural enzyme, allowing the detection of xanthine using cascade catalysis. Association with gold nanoparticles makes NDs a good carbonic catalyst due to charge transfer at the metal-carbon interface and facilitated substrate adsorption. The results of this study suggest that diverse carbonic catalysts can be obtained by interfacial incorporation of various metal/inorganic substances.

Original languageEnglish
Pages (from-to)34317-34326
Number of pages10
JournalACS Applied Materials and Interfaces
Volume8
Issue number50
DOIs
Publication statusPublished - 2016 Dec 21

Bibliographical note

Funding Information:
This work was supported by the Human Resources Program in Energy Technology of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) funded by the Ministry of Trade, Industry & Energy, Republic of Korea (No. 20154010200810) and by the Ministry of Science, ICT & Future Planning (NRF-2015R1C1A2A01053307).

Publisher Copyright:
© 2016 American Chemical Society.

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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