Selective zinc ion detection by functionalised ZnO nanorods with ionophore
2011 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 110, no 10, 104702- p.Article in journal (Refereed) Published
In this paper, highly dense and well aligned single-crystal zinc oxide nanorods were grown along the c-axis on a gold coated glass substrate using a low temperature aqueous chemical growth approach. The prepared ZnO nanorods were functionalized with plastic membrane coatings containing specific ionophore (12-crown-4) which is highly selective to zinc ions (Zn(+2)). The electrochemical response of the sensor was found to be linear over a relatively wide logarithmic concentration range from 1 mu M to 100mM. The proposed sensor showed a good linearity with a high sensitivity of similar to 35 mV/decade for sensing Zn(+2) ions. A fast response time of less than 5 s with a good selectivity, repeatability, reproducibility, and negligible response to common interferents ions such as calcium (Ca(2+)), magnesium (Mg(2+)), or potassium (K(+)), and iron (Fe(+3)) and copper (Cu(+2)) was also demonstrated. Moreover, the proposed sensor showed good stoichiometric results for potentiometric titration.
Place, publisher, year, edition, pages
American Institute of Physics (AIP) , 2011. Vol. 110, no 10, 104702- p.
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-74167DOI: 10.1063/1.3662107ISI: 000297943700129OAI: oai:DiVA.org:liu-74167DiVA: diva2:480834