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Electrochemical Sensor for Sensitive Determination of Ga(III) Ion Based on β ‐Cyclodextrin Incorporated Multi‐walled Carbon Nanotubes and Imprinted Sol‐gel Composite Film
Author(s) -
Hu Yufang,
Zhang Zhaohui,
Zhang Huabin,
Luo Lijuan,
Zhang Minglei,
Yang Xiao,
Yao Shouzhuo
Publication year - 2012
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201180474
Subject(s) - chronoamperometry , chemistry , electrochemical gas sensor , detection limit , carbon nanotube , cyclic voltammetry , differential pulse voltammetry , calibration curve , analytical chemistry (journal) , electrochemistry , electrode , carbon paste electrode , scanning electron microscope , cyclodextrin , nuclear chemistry , nanotechnology , chromatography , materials science , composite material
A novel sensor for detection of trace gallium ion [Ga(III)] was created by stepwise modification of a gold electrode with β ‐cyclodextrin ( β ‐CD)/multi‐walled carbon nanotubes (MWCNTs) and an ion imprinted polymer (IIP). The sensor surface morphology was characterized by scanning electron microscopy. The electrochemical performance of the imprinted sensor was investigated by cyclic voltammetry, differential pulse voltammetry and chronoamperometry. The sensor displayed excellent selectivity towards the target Ga(III) ion. Meanwhile, the introduced MWCNTs displayed noticeable catalytic activity, and β ‐CD demonstrated significant enrichment capacity. A linear calibration curve was obtained covering the concentration range from 5.0×10 −8 to 1.0×10 −4 mol·L −1 , with a detection limit of 7.6×10 −9 mol·L −1 . The proposed sensor was successfully applied to detect Ga(III) in real urine samples.