DocumentCode :
3121203
Title :
Novel electrode materials for electrochemical sensors
Author :
Guth, U. ; Zosel, J. ; Riedel, J. ; Tran, N. ; Berthold, M. ; Vonau, C. ; Sasum, U. ; Shuk, P. ; Paramasivam, M. ; Vashook, V.
Author_Institution :
Dept. of Chem. & Food Chem., Dresden Univ. of Technol., Dresden, Germany
fYear :
2011
fDate :
Nov. 28 2011-Dec. 1 2011
Firstpage :
685
Lastpage :
689
Abstract :
Electrode materials are the key components for electrochemical sensors, which can be used for determination of gaseous and dissolved species. The sensitivity as well as the selectivity are mainly influenced by the kind and the structure of sensitive electrode material. In this paper two kinds of materials are described. Screen printed carbon electrodes can be modified by thin layers of conducting polymers like Poly(3,4-ethylendioxythiophene) (PEDOT). By means of differential pulse (DPV) and square wave voltammetry (SWV) it is possible to determine biogene amine like dopamine in liquids of human bodies and explosives in ground water in the μM und ppb level, respectively. Polyaniline (PANI) can be used not only at room temperature but also in high temperature sensors. For the first time we could show that zirconia sensors with Nb2O5 or FeCl3 and Co(NO3)2 embedded PANI electrodes are suitable for the hydrogen and hydrocarbons sensing in oxygen containing atmospheres at 450 °C. The sensitivities of such electrodes are much higher than those of the usual applied oxide systems like Nb2O5 or La0.75Ca0.25Mn0.5Ni0.5O3-δ. Due to the availability and compactness of electronic devices electrochemical sensors with modified electrodes can be applied in stationary (potentiometric) and non-stationary (SWV or DPV) mode in field application.
Keywords :
conducting polymers; electrochemical sensors; electrodes; potentiometers; voltammetry (chemical analysis); DPV; PEDOT; Poly(3,4-ethylendioxythiophene); SWV; conducting polymer; differential pulse; electrochemical sensors; electrode material; nonstationary mode; potentiometric mode; screen printed carbon electrode; square wave voltammetry; Carbon; Electrodes; Plastics; Sensitivity; Temperature sensors; conducting polymers; differential pulse voltammetry; dopamine; explosives; gold nano-particles; hydrocarbons; hydrogen; mixed potential sensor; screen-printed carbon electrode; square wave voltammetry; zirconia solid electrolyte;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Sensing Technology (ICST), 2011 Fifth International Conference on
Conference_Location :
Palmerston North
ISSN :
2156-8065
Print_ISBN :
978-1-4577-0168-9
Type :
conf
DOI :
10.1109/ICSensT.2011.6137070
Filename :
6137070
Link To Document :
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