Electrocatalytic application for gold nanoparticles decorated sulfur-nitrogen co-doped graphene oxide nanosheets and nanosized cobalt tetra aminophenoxy phthalocyanine conjugates
Sulfur and nitrogen affinity for gold is utilized to self-assemble gold nanorods (AuNRs) on S, N doped or S/N co-doped graphene oxide nanosheets (SGONS/AuNRs, NGONS/AuNRs or SNGONS/AuNRs) for enhancement of the electrocatalytic activity of nanosized cobalt tetra aminophenoxy phthalocyanine (complex...
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2018
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| Online Access: | https://doi.org/10.1016%2Fj.electacta.2017.03.154 http://hdl.handle.net/11408/3295 |
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| author | Shumba, Munyaradzi Nyokong, Tebello |
| author_facet | Shumba, Munyaradzi Nyokong, Tebello |
| author_sort | Shumba, Munyaradzi |
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| description | Sulfur and nitrogen affinity for gold is utilized to self-assemble gold nanorods (AuNRs) on S, N doped or S/N co-doped graphene oxide nanosheets (SGONS/AuNRs, NGONS/AuNRs or SNGONS/AuNRs) for enhancement of the electrocatalytic activity of nanosized cobalt tetra aminophenoxy phthalocyanine (complex 1) towards hydrogen peroxide detection. Of the electrodes containing AuNRs, 1-SNGONS/AuNRs-GCE gave the lowest limits of detection (LOD) of 0.012μM followed by 1-SGONS/AuNRs-GCE and 1-AuNRs-SNGONS(seq)-GCE both with LOD of 0.016μM. This work shows that in the absence of GONS (when AuNRs are alone and in the presence of 1 in 1/AuNRs-GCE), unfavorable detection limits are obtained and that doping of GONS is important in improving LOD. 1-SNGONS/AuNRs-GCE showed concentration dependent mechanisms resulting in two adsorption Gibbs energies (ΔGo) of −18.55kJmol−1 and −17.35kJmol−1 at high and low concentrations, respectively. |
| format | Article |
| id | ir-11408-3295 |
| institution | My University |
| language | English |
| publishDate | 2018 |
| publisher | Elsevier |
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| spelling | ir-11408-32952022-06-27T13:49:06Z Electrocatalytic application for gold nanoparticles decorated sulfur-nitrogen co-doped graphene oxide nanosheets and nanosized cobalt tetra aminophenoxy phthalocyanine conjugates Shumba, Munyaradzi Nyokong, Tebello Cobalt tetraaminophenoxy phthalocyanine Graphene oxide nanosheets Hydrogen peroxide Sulfur and nitrogen affinity for gold is utilized to self-assemble gold nanorods (AuNRs) on S, N doped or S/N co-doped graphene oxide nanosheets (SGONS/AuNRs, NGONS/AuNRs or SNGONS/AuNRs) for enhancement of the electrocatalytic activity of nanosized cobalt tetra aminophenoxy phthalocyanine (complex 1) towards hydrogen peroxide detection. Of the electrodes containing AuNRs, 1-SNGONS/AuNRs-GCE gave the lowest limits of detection (LOD) of 0.012μM followed by 1-SGONS/AuNRs-GCE and 1-AuNRs-SNGONS(seq)-GCE both with LOD of 0.016μM. This work shows that in the absence of GONS (when AuNRs are alone and in the presence of 1 in 1/AuNRs-GCE), unfavorable detection limits are obtained and that doping of GONS is important in improving LOD. 1-SNGONS/AuNRs-GCE showed concentration dependent mechanisms resulting in two adsorption Gibbs energies (ΔGo) of −18.55kJmol−1 and −17.35kJmol−1 at high and low concentrations, respectively. 2018-11-02T08:10:54Z 2018-11-02T08:10:54Z 2017 Article 0013-4686 https://doi.org/10.1016%2Fj.electacta.2017.03.154 http://hdl.handle.net/11408/3295 en Electrochimica Acta;Vol. 236: p. 212-220 open Elsevier |
| spellingShingle | Cobalt tetraaminophenoxy phthalocyanine Graphene oxide nanosheets Hydrogen peroxide Shumba, Munyaradzi Nyokong, Tebello Electrocatalytic application for gold nanoparticles decorated sulfur-nitrogen co-doped graphene oxide nanosheets and nanosized cobalt tetra aminophenoxy phthalocyanine conjugates |
| title | Electrocatalytic application for gold nanoparticles decorated sulfur-nitrogen co-doped graphene oxide nanosheets and nanosized cobalt tetra aminophenoxy phthalocyanine conjugates |
| title_full | Electrocatalytic application for gold nanoparticles decorated sulfur-nitrogen co-doped graphene oxide nanosheets and nanosized cobalt tetra aminophenoxy phthalocyanine conjugates |
| title_fullStr | Electrocatalytic application for gold nanoparticles decorated sulfur-nitrogen co-doped graphene oxide nanosheets and nanosized cobalt tetra aminophenoxy phthalocyanine conjugates |
| title_full_unstemmed | Electrocatalytic application for gold nanoparticles decorated sulfur-nitrogen co-doped graphene oxide nanosheets and nanosized cobalt tetra aminophenoxy phthalocyanine conjugates |
| title_short | Electrocatalytic application for gold nanoparticles decorated sulfur-nitrogen co-doped graphene oxide nanosheets and nanosized cobalt tetra aminophenoxy phthalocyanine conjugates |
| title_sort | electrocatalytic application for gold nanoparticles decorated sulfur-nitrogen co-doped graphene oxide nanosheets and nanosized cobalt tetra aminophenoxy phthalocyanine conjugates |
| topic | Cobalt tetraaminophenoxy phthalocyanine Graphene oxide nanosheets Hydrogen peroxide |
| url | https://doi.org/10.1016%2Fj.electacta.2017.03.154 http://hdl.handle.net/11408/3295 |
| work_keys_str_mv | AT shumbamunyaradzi electrocatalyticapplicationforgoldnanoparticlesdecoratedsulfurnitrogencodopedgrapheneoxidenanosheetsandnanosizedcobalttetraaminophenoxyphthalocyanineconjugates AT nyokongtebello electrocatalyticapplicationforgoldnanoparticlesdecoratedsulfurnitrogencodopedgrapheneoxidenanosheetsandnanosizedcobalttetraaminophenoxyphthalocyanineconjugates |