The effects of carbon nanotubes on the electrocatalysis of hydrogen peroxide by metallo-phthalocyanines
The pre-grafted screen-printed gold electrode modified with phenyl-amino monolayer was investigated for covalent immobilization of phenyl-amine functionalized single-walled carbon nanotubes (PA-SWCNT) and metal tetra-amino phthalocyanine (MTAPc) using Schiff-base reactions with benzene-1,4-dicarbald...
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Elsevier
2016
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| Online Access: | http://dx.doi.org.access.msu.ac.zw:2048/10.1016/j.talanta.2011.07.069 |
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| author | Mashazi, Philani Mugadza, Tawanda Sosibo, Ndabenhle Mdluli, Phumlani Vilakazi, Sibulelo Nyokong, Tebello |
| author_facet | Mashazi, Philani Mugadza, Tawanda Sosibo, Ndabenhle Mdluli, Phumlani Vilakazi, Sibulelo Nyokong, Tebello |
| author_sort | Mashazi, Philani |
| collection | DSpace |
| description | The pre-grafted screen-printed gold electrode modified with phenyl-amino monolayer was investigated for covalent immobilization of phenyl-amine functionalized single-walled carbon nanotubes (PA-SWCNT) and metal tetra-amino phthalocyanine (MTAPc) using Schiff-base reactions with benzene-1,4-dicarbaldehyde (BDCA) as cross-linker. The PA-SWCNT and MTAPc modified electrodes were applied as hybrids for electrochemical sensing of H2O2. The step-by-step fabrication of the electrode was followed using electrochemistry, impedance spectroscopy, scanning electron microscopy and Raman spectroscopy and all these techniques confirmed the fabrication and the immobilization of PA-SWCNT, MnTAPc and CoTAPc onto gold surfaces. The apparent electron transfer constant (kapp) showed that the carbon nanotubes and metallo-phthalocyanines hybrids possess good electron transfer properties compared to the bare, pre-grafted and the MTAPc modified gold electrode surfaces without PA-SWCNT. The electrochemical sensing of hydrogen peroxide was successful with PA-SWCNT–MTAPc hybrid systems showing higher electrocatalytic currents compared to the other electrodes. The analytical parameters obtained using chronoamperometry gave good linearity at H2O2 concentrations ranging from 1.0 to 30.0 μmol L−1. The values for the limit of detection (LoD) were found to be of the orders of 10−7 M using the 3δ for all the electrodes. The PA-SWCNT–MTAPc modified SPAuEs were much more sensitive compared to PA–MTAPc modified SPAuEs. |
| format | Article |
| id | ir-11408-1096 |
| institution | My University |
| language | English |
| publishDate | 2016 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | ir-11408-10962022-06-27T13:49:06Z The effects of carbon nanotubes on the electrocatalysis of hydrogen peroxide by metallo-phthalocyanines Mashazi, Philani Mugadza, Tawanda Sosibo, Ndabenhle Mdluli, Phumlani Vilakazi, Sibulelo Nyokong, Tebello Single-wall carbon nanotubes Metal tetra-amino phthalocyanine Electroanalysis Hydrogen peroxide The pre-grafted screen-printed gold electrode modified with phenyl-amino monolayer was investigated for covalent immobilization of phenyl-amine functionalized single-walled carbon nanotubes (PA-SWCNT) and metal tetra-amino phthalocyanine (MTAPc) using Schiff-base reactions with benzene-1,4-dicarbaldehyde (BDCA) as cross-linker. The PA-SWCNT and MTAPc modified electrodes were applied as hybrids for electrochemical sensing of H2O2. The step-by-step fabrication of the electrode was followed using electrochemistry, impedance spectroscopy, scanning electron microscopy and Raman spectroscopy and all these techniques confirmed the fabrication and the immobilization of PA-SWCNT, MnTAPc and CoTAPc onto gold surfaces. The apparent electron transfer constant (kapp) showed that the carbon nanotubes and metallo-phthalocyanines hybrids possess good electron transfer properties compared to the bare, pre-grafted and the MTAPc modified gold electrode surfaces without PA-SWCNT. The electrochemical sensing of hydrogen peroxide was successful with PA-SWCNT–MTAPc hybrid systems showing higher electrocatalytic currents compared to the other electrodes. The analytical parameters obtained using chronoamperometry gave good linearity at H2O2 concentrations ranging from 1.0 to 30.0 μmol L−1. The values for the limit of detection (LoD) were found to be of the orders of 10−7 M using the 3δ for all the electrodes. The PA-SWCNT–MTAPc modified SPAuEs were much more sensitive compared to PA–MTAPc modified SPAuEs. 2016-04-27T12:42:38Z 2016-04-27T12:42:38Z 2011 Article 0039-9140 http://dx.doi.org.access.msu.ac.zw:2048/10.1016/j.talanta.2011.07.069 en Talanta;Vol. 85, no.4 open Elsevier |
| spellingShingle | Single-wall carbon nanotubes Metal tetra-amino phthalocyanine Electroanalysis Hydrogen peroxide Mashazi, Philani Mugadza, Tawanda Sosibo, Ndabenhle Mdluli, Phumlani Vilakazi, Sibulelo Nyokong, Tebello The effects of carbon nanotubes on the electrocatalysis of hydrogen peroxide by metallo-phthalocyanines |
| title | The effects of carbon nanotubes on the electrocatalysis of hydrogen peroxide by metallo-phthalocyanines |
| title_full | The effects of carbon nanotubes on the electrocatalysis of hydrogen peroxide by metallo-phthalocyanines |
| title_fullStr | The effects of carbon nanotubes on the electrocatalysis of hydrogen peroxide by metallo-phthalocyanines |
| title_full_unstemmed | The effects of carbon nanotubes on the electrocatalysis of hydrogen peroxide by metallo-phthalocyanines |
| title_short | The effects of carbon nanotubes on the electrocatalysis of hydrogen peroxide by metallo-phthalocyanines |
| title_sort | effects of carbon nanotubes on the electrocatalysis of hydrogen peroxide by metallo-phthalocyanines |
| topic | Single-wall carbon nanotubes Metal tetra-amino phthalocyanine Electroanalysis Hydrogen peroxide |
| url | http://dx.doi.org.access.msu.ac.zw:2048/10.1016/j.talanta.2011.07.069 |
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