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Electro-oxidation of hydrazine at gold nanoparticle functionalised single walled carbon nanotube network ultramicroelectrodes
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Dudin, Petr V., Unwin, Patrick R. and Macpherson, Julie V. (2011) Electro-oxidation of hydrazine at gold nanoparticle functionalised single walled carbon nanotube network ultramicroelectrodes. Physical Chemistry Chemical Physics, Volume 13 (Number 38). pp. 17146-17152. doi:10.1039/c1cp21937e ISSN 1463-9076.
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WRAP_Dudin, PCCP, 2011.pdf - Accepted Version Download (1486Kb) | Preview |
Official URL: http://dx.doi.org/10.1039/C1CP21937E
Abstract
Networks of pristine single walled carbon nanotubes (SWNTs) grown by catalysed chemical vapour deposition (cCVD) on an insulating surface and arranged in an ultramicroelectrode (UME) format are insensitive to the electro-oxidation of hydrazine (HZ) in aqueous solution, indicating a negligible metallic nanoparticle content. Sensitisation of the network towards HZ oxidation is promoted by the deliberate and controlled electrodeposition of “naked” gold (Au) nanoparticles (NPs). By controlling the deposition conditions (potential, time) it is possible to control the size and spacing of the Au NPs on the underlying SWNT network. Two different cases are considered: Au NPs at a number density of 250 ± 13 NPs μm−2 and height 24 nm ± 5 (effective surface coverage, θ = 92%) and (ii) Au NPs of number density 22 ± 3 NPs μm−2 and height 43 nm ± 8 nm (θ = 35%). For both morphologies the HZ oxidation half-wave potential (E1/2) is shifted significantly negative by ca. 200 mV, compared to a gold disc UME of the same geometric area, indicating significantly more facile electron transfer kinetics. E1/2 for HZ oxidation for the higher density Au NP-SWNT structure is shifted slightly more negative (by 25 mV) than E1/2 for the lower density Au NP electrode. This is attributed to the lower flux of HZ at NPs in the higher number density arrangement (smaller kinetic demand). Importantly, using this approach, the calculated HZ oxidation current density sensitivities for the Au NP-SWNT electrodes reported here are higher than for many other metal NP functionalised carbon nanotube electrodes.
| Item Type: | Journal Article | ||||
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| Subjects: | Q Science > QC Physics Q Science > QD Chemistry |
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| Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||
| Library of Congress Subject Headings (LCSH): | Electrolytic oxidation, Hydrazine, Nanoparticles, Ultramicroelectrodes, Nanotubes | ||||
| Journal or Publication Title: | Physical Chemistry Chemical Physics | ||||
| Publisher: | Royal Society of Chemistry | ||||
| ISSN: | 1463-9076 | ||||
| Official Date: | 14 October 2011 | ||||
| Dates: |
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| Volume: | Volume 13 | ||||
| Number: | Number 38 | ||||
| Page Range: | pp. 17146-17152 | ||||
| DOI: | 10.1039/c1cp21937e | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Date of first compliant deposit: | 18 December 2015 | ||||
| Date of first compliant Open Access: | 18 December 2015 | ||||
| Funder: | Engineering and Physical Sciences Research Council (EPSRC), European Research Council (ERC), Birmingham Science City, Advantage West Midlands (AWM), European Regional Development Fund (ERDF) | ||||
| Grant number: | EP/H023909/1 (EPSRC), ERC-2009-AdG 247143-QUANTIF (PRU and PVD) |
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