Multiwall Carbon Nanotubes Modified Carbon Paste Electrode for Determination of Copper(II) by Potentiometric and Impedimetric Methods

Journal of Nanostructures

S. Masoum¹  M. Mazloum-Ardakani²  A. A. Mandegari³  H. Naeimi⁴ 

[1] Department of Analytical Chemistry, Faculty of Chemistry, University of Kashan, Kashan, 87317, I.R. Iran;Department of Chemistry, Faculty of Science, Yazd University, Yazd, I. R. Iran;Department of Chemistry, Payame Noor University, P.O. Box 19395-4697 Tehran, I. R. Iran;Department of Organic Chemistry, Faculty of Chemistry, University of Kashan, Kashan, I. R. Iran;

关键词: Multiwall carbon nanotube;    Carbon paste electrode;    Electrochemical impedance;    Response surface methodology;    Central Composite Design;   

DOI  :  10.7508/jns.2012.03.008

来源: DOAJ

【 摘 要 】

A chemically modified carbon paste electrode with multiwall carbonnanotube (MWCNT) was prepared and used as a sensor for Cu2+  ion.The unique chemical and physical properties of CNT have paved theway  to  new  and  improved  sensing  devices.  A  central  compositechemometrics  design  was  applied  for  multivariate  optimization  ofthe  effects  of  three  significant  parameters  (Graphite  powder  (X1),MWCNT  (X2)  and  Ionophre  (X3))  influencing  the  response  of  theelectrode.  In  the  optimized  conditions,  the  electrode  exhibits  aNernstian  slope  of  30.1  mV/decade  in  a  linear  range  between1.0×10-6   to1.0×10-1  M over a wide pH range (2.0-6.5). Importantly,the  effect  of  the  MWCNT  on  the  performance  of  electrode  wasinvestigated  by  impedance  technique,  that  showed  the  MWCNThelps the transduction of the signal in carbon paste electrode and thecharged  transfer  resistance  (Rct)  was  reduced.  The  impedimetricresults indicated that the linear concentrations range was 1.0×10−7  to1.0×10−1  M  and  in  comparison  with  potentiometry,  the  pH  rangeincreased to 2.0−7.5.

【 授权许可】

Unknown