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Highly Sensitive Nitric Oxide Sensing Using Three‐Dimensional Graphene/Ionic Liquid Nanocomposite
Author(s) -
Ng Shu Rui,
Guo Chun Xian,
Li Chang Ming
Publication year - 2011
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.201000344
Subject(s) - hexafluorophosphate , ionic liquid , nanocomposite , graphene , materials science , oxide , detection limit , carbon nanotube , chemical engineering , electrochemistry , inorganic chemistry , nanotechnology , chemistry , electrode , chromatography , organic chemistry , catalysis , engineering , metallurgy
A nanocomposite gel with a uniform porous structure and well‐controlled compositions prepared by mixing three‐dimensional graphene material with an ionic liquid, 1‐butyl‐3‐methylimidazolium hexafluorophosphate, is used for nitric oxide detection. It shows a fast response of less than 4 seconds, an excellent sensitivity of 11.2 µA cm −2 (µmol/L) −1 and an extremely low detection limit of 16 nM with a signal‐to‐noise ratio of 3 ( S / N =3), a performance superior to that of reported works based on carbon nanotubes and nanoparticles. The high sensitivity is attributed to the large electroactive surface area of the graphene gel nanocomposite towards nitric oxide oxidation. The electrochemical behavior of the gel nanocomposite is investigated and explained.