期刊
ELECTROANALYSIS
卷 16, 期 1-2, 页码 54-59出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.200302934
关键词
RF sputtering; iridium nanoparticles; graphite-like carbon; electrocatalytic
We prepared a thin film electrode consisting of a 3.3% atomic concentration of iridium nanoparticles dispersed in graphite-like carbon (Ir-NDC) by a simple RF sputtering method. The film structure was characterized by TEM, XPS and AFM. The TEM results showed that the Ir particles, whose average size was 2 nm, were homogenously dispersed in the carbon matrix, XPS revealed two chemical states of Ir (Ir(O) and Ir(IV)) in the film. The Ir-NDC film electrode exhibited excellent electrocatalytic ability with regard to H2O2 reduction with low atomic concentration compared to the bulk Ir electrode. The effect of L-ascorbic acid can be suppressed due to the reductive detection of hydrogen peroxide. We applied this electrode for enzymatic glutamate detection. At a detection potential of -0.15 V (vs. Ag/AgCl), we could measure the concentration of glutamate without interferences from ascorbic acid and oxygen.
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