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Platinum Nanoparticles Decorated Multiwalled Carbon Nanotubes – Ionic Liquid Composite Film Coated Glassy Carbon Electrodes for Sensitive Determination of Theophylline
Author(s) -
Liu Liqin,
Xiao Fei,
Li Jiangwen,
Wu Weibing,
Zhao Faqiong,
Zeng Baizhao
Publication year - 2008
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.200704163
Subject(s) - ionic liquid , hexafluorophosphate , materials science , detection limit , platinum , cyclic voltammetry , nanoparticle , electrode , hypoxanthine , platinum nanoparticles , nuclear chemistry , carbon nanotube , xanthine , electrochemistry , chemistry , nanotechnology , chromatography , catalysis , organic chemistry , enzyme
Platinum nanoparticles (Pt nano ) decorated multiwalled carbon nanotubes (MWCNTs)–1‐octyl‐3‐methylimidazolium hexafluorophosphate ([omim][PF 6 ]) composite material (MWCNTs‐Pt nano ‐[omim][PF 6 ]) was fabricated and characterized for the first time. In the presence of [omim][PF 6 ], more Pt nano could deposit on MWCNTs. The average diameter of the deposited Pt nano was about 5 nm. The composite material film coated glassy carbon electrode (GCE) exhibited sensitive voltammetric response to theophylline (TP). Under the optimized conditions (i.e., preconcentration for 2 minutes on open circuit in 0.10 M pH 3.0 phosphate buffer), the anodic peak current of TP at about 1.1 V (vs. SCE) was linear to TP concentration over the range of 1.0×10 −8 –1.0×10 −5 M. The detection limit was estimated to be 8.0×10 −9 M. The modified electrode was successfully applied to the determination of TP in medicine tablet and green tea. In addition, the voltammetric responses of hypoxanthine (HX), xanthine (Xan) and uric acid (UA) on the MWCNTs‐Pt nano ‐[omim][PF 6 ]/GCE were also discussed.