Solid-state pH ultramicrosensor based on a tungstic oxide film fabricated on a tungsten nanoelectrode and its application to the study of endothelial cells

Yamamoto, Katsunobu; Shi, Guoyue; Zhou, Tianshu; Xu, Fan; Zhu, Min; Liu, Min; Kato, Takeshi; Jin, Jiye; Jin, Litong

doi:10.1016/s0003-2670(02)01602-1

Cited by 63 publications

(37 citation statements)

References 35 publications

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“…The highest sensitivity was found for the type B electrode (electrochemically oxidized W rod in 0.1 mol dm À3 H 2 SO 4 ) amounting to À49.5 ± 2.3 mV per pH unit, with R 2 = 0.99, which agrees well with the previous reports on the sensitivity of tungsten based pH sensors in air-saturated buffer solutions [26,30,43]. The electrodes type A (electrochemically polished W rod in 0.1 mol dm À3 KOH) and C (aged W rod in 0.1 mol dm À3 KOH) displayed less satisfactory slope, as well as a scatter of points.…”

Section: Potentiometric Ph Determination By Means Of W/wo 3 Electrodessupporting

confidence: 91%

“…Commonly reported application of tungsten oxide electrode involves potentiometric technique for pH sensing [26][27][28][29][30]. Different routes of metallic tungsten transformation into a W/WO 3 electrode were reported, such as electrochemical oxidation [26], aging in alkaline solution [27], flame oxidation [29] and annealing in oxygen atmosphere [30]. All these reports agreed that, independently on the preparation procedure, the electrode displayed sub-Nernstian behavior, yet being applicable for reliable pH determination in the range between 2 and 12.…”

Section: Introductionmentioning

confidence: 99%

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Switching between voltammetry and potentiometry in order to determine H+ or OH− ion concentration over the entire pH scale by means of tungsten disk electrode

Pašti

Lazarević‐Pašti

Mentus

2012

Journal of Electroanalytical Chemistry

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Section: Potentiometric Ph Determination By Means Of W/wo 3 Electrodessupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Switching between voltammetry and potentiometry in order to determine H+ or OH− ion concentration over the entire pH scale by means of tungsten disk electrode

Pašti

Lazarević‐Pašti

Mentus

2012

Journal of Electroanalytical Chemistry

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“…The stick-shaped samples were dipped into an electrolyte and processed according to the procedure described in Ref. [73]. One problem encountered was that the surface tension of the electrolytes caused the liquid to creep up along the wire so that the NiAl matrix was also wetted; this led to unwanted side effects which influenced the OCP.…”

Section: Superhydrophobicitymentioning

confidence: 99%

Preparation and specific properties of single crystalline metallic nanowires

Hassel

Bello-Rodriguez

Sutherland-Smith

et al. 2010

Physica Status Solidi (b)

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Directional solidification of eutectics is a route to produce isooriented metallic single crystalline nanowires (NWs). Etching or electrochemical oxidation allows selective dissolution of either of the phases to produce NW arrays, isolated NWs, nanopore arrays and also derived structures by combining various process steps. A good understanding of the thermodynamics and the kinetics of the phase transformation and chemical reactions including electrodissolution, passivation, selective etching, complexing of reaction products and electrodeposition in the systems NiAl-X (X ¼ Re, W, Mo), Ag-Cu and Fe-Au was reached. Functional devices based on these NWs, like high aspect ratio NW based STM tips, nanoelectromechanical systems (NEMS), NW pH sensors and sensor arrays were constructed.Array of rhenium single crystalline NWs embedded in the NiAl matrix after partial dissolution of the matrix.

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“…[11][12][13][14] The scale on which pH electrodes can be made has advanced in recent years to the micro 15,16 and nano scale. 17,18 SECM pH probes employing a variety of metal/metal oxides have been reported previously. 15,[19][20][21] Iridium oxide-based pH ultramicroelectrodes have proven particularly popular for spatially resolved pH measurements in SECM, owing to their fast response time, long termstability over a wide range of pHs, temperatures and pressures, all-solid format and capability for miniaturization.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Dual Function Nanoscale pH-Scanning Ion Conductance Microscopy (SICM) Probes for High Resolution pH Mapping

et al. 2013

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(2013) Fabrication and characterization of dual function nanoscale pH-scanning ion conductance microscopy (SICM) probes for high resolution pH mapping. Analytical Chemistry, Volume 85 (Number 17). pp. 8070-8074 Permanent WRAP url: http://wrap.warwick.ac.uk/57249 Copyright and reuse:The Warwick Research Archive Portal (WRAP) makes this work of researchers of the University of Warwick available open access under the following conditions. Copyright © and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable the material made available in WRAP has been checked for eligibility before being made available.Copies of full items can be used for personal research or study, educational, or not-forprofit purposes without prior permission or charge. Provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. Publisher's statement:This document is the Accepted Manuscript version of a Published Work that appeared in final form in Analytical Chemistry copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work http://dx.doi.org/10.1021/ac401883n The version presented here may differ from the published version or, version of record, if you wish to cite this item you are advised to consult the publisher's version. Please see the 'permanent WRAP url' above for details on accessing the published version and note that access may require a subscription. AbstractThe easy fabrication and use of nanoscale dual function pH-scanning ion conductance microscopy (SICM) probes is reported. These probes incorporate an iridium oxide coated carbon electrode for pH measurement and an SICM barrel for distance control, enabling simultaneous pH and topography mapping. These pH-SICM probes were fabricated rapidly from laser pulled theta quartz pipets, with the pH electrode prepared by in-situ carbon filling of one of the barrels by the pyrolytic decomposition of butane, followed by electrodeposition of a thin layer of hydrous iridium oxide. The other barrel was filled with an electrolyte solution and Ag/AgCl electrode as part of a conductance cell for SICM. The fabricated probes, with pH and SICM sensing elements typically on the 100 nm scale, were characterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy and various electrochemical measurements. They showed a linear super-Nernstian pH response over a range of pH (pH 2-10). The capability of the pH-SICM probe was demonstrated by detecting both pH and topographical changes during the dissolution of a calcite microcrystal in aqueous solution. This system illustrates the quantitative nature of pH-SICM imaging, because the dissolution process changes the crystal height and interfacial pH (compared to bulk) and each is sensitive to the rate. Both measurements reve...

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Solid-state pH ultramicrosensor based on a tungstic oxide film fabricated on a tungsten nanoelectrode and its application to the study of endothelial cells

Cited by 63 publications

References 35 publications

Switching between voltammetry and potentiometry in order to determine H+ or OH− ion concentration over the entire pH scale by means of tungsten disk electrode

Switching between voltammetry and potentiometry in order to determine H+ or OH− ion concentration over the entire pH scale by means of tungsten disk electrode

Preparation and specific properties of single crystalline metallic nanowires

Fabrication and Characterization of Dual Function Nanoscale pH-Scanning Ion Conductance Microscopy (SICM) Probes for High Resolution pH Mapping

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