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Reductive H 2 O 2 Detection at Nanoparticle Iridium/Carbon Film Electrode and Its Application as L ‐Glutamate Enzyme Sensor
Author(s) -
You Tianyan,
Niwa Osamu,
Kurita Ryoji,
Iwasaki Yuzuru,
Hayashi Katsuyoshi,
Suzuki Koji,
Hirono Shigeru
Publication year - 2004
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200302934
Subject(s) - ascorbic acid , x ray photoelectron spectroscopy , electrode , iridium , nanoparticle , materials science , analytical chemistry (journal) , carbon fibers , nuclear chemistry , inorganic chemistry , chemistry , chemical engineering , nanotechnology , catalysis , organic chemistry , food science , composite number , engineering , composite material
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(0) and Ir(IV)) in the film. The Ir‐NDC film electrode exhibited excellent electrocatalytic ability with regard to H 2 O 2 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.