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Shitanda I, Miyazaki K, Loew N, Esaka R, Hoshi Y, Itagaki M. A screen-printed three-electrode-type sticker device with an accurate liquid junction-type reference electrode. Chem Commun (Camb) 2021; 57:2875-2878. [PMID: 33656029 DOI: 10.1039/d1cc00850a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We developed a novel sticker device that can convert any metal or alloy into the working electrode of a three-electrode system, enabling simple and accurate measurement. The sticker, containing a counter electrode and a stable and accurate liquid junction-type reference electrode, is attached to the metal or alloy; meanwhile the surface exposed from a hole in the device functions as the working electrode. This sticker device was fabricated by screen-printing. The polarization curve of the copper and tin-plated copper measured using the sticker device exhibited approximately the same behavior as that obtained for the conventional three-electrode system. The characteristics of various materials can be easily evaluated using this system by only dropping a small amount of solution.
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Affiliation(s)
- Isao Shitanda
- Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan. and Research Institute for Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - Kaishi Miyazaki
- Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.
| | - Noya Loew
- Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.
| | - Ryosuke Esaka
- Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.
| | - Yoshinao Hoshi
- Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.
| | - Masayuki Itagaki
- Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan. and Research Institute for Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
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Wang N, Kanhere E, Tao K, Hu L, Wu J, Miao J, Triantafyllou MS. Investigation of a Thin‐Film Quasi‐Reference Electrode Fabricated by Combined Sputtering‐Evaporation Approach. ELECTROANAL 2018. [DOI: 10.1002/elan.201800532] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Nan Wang
- Center for Environmental Sensing and Modeling (CENSAM) IRGSingapore-MIT Alliance for Research and Technology (SMART) Centre 1 CREATE Way 138602 Singapore
| | - Elgar Kanhere
- Center for Environmental Sensing and Modeling (CENSAM) IRGSingapore-MIT Alliance for Research and Technology (SMART) Centre 1 CREATE Way 138602 Singapore
| | - Kai Tao
- Department of Microsystem EngineeringNorthwestern Polytechnical University 127 West Youyi Road, Beilin District Xi'an Shaanxi 710072 China
| | - Liangxing Hu
- School of Mechanical and Aerospace EngineeringNanyang Technological University 50 Nanyang Avenue 639798 Singapore
| | - Jin Wu
- School of Electronics and Information TechnologySun Yat-sen University No. 135, Xingang Xi Road Guangzhou 510275 China
| | - Jianmin Miao
- School of Mechanical and Aerospace EngineeringNanyang Technological University 50 Nanyang Avenue 639798 Singapore
| | - Michael S. Triantafyllou
- Center for Environmental Sensing and Modeling (CENSAM) IRGSingapore-MIT Alliance for Research and Technology (SMART) Centre 1 CREATE Way 138602 Singapore
- Department of Mechanical EngineeringMassachusetts Institute of Technology 77 Massachusetts Avenue Cambridge, MA 02139 USA
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Chaisiwamongkhol K, Batchelor-McAuley C, Compton RG. Amperometric micro pH measurements in oxygenated saliva. Analyst 2018; 142:2828-2835. [PMID: 28702560 DOI: 10.1039/c7an00809k] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An amperometric micro pH sensor has been developed based on the chemical oxidation of carbon fibre surfaces (diameter of 9 μm and length of ca. 1 mm) to enhance the population of surface quinone groups for the measurement of salivary pH. The pH analysis utilises the electrochemically reversible two-electron, two-proton behaviour of surface quinone groups on the micro-wire electrodes. A Nernstian response is observed across the pH range 2-8 which is the pH range of many biological fluids. We highlight the measurement of pH in small volumes of biological fluids without the need for oxygen removal and specifically the micro pH electrode is examined by measuring the pH of commercial synthetic saliva and authentic human saliva samples. The results correspond well with those obtained by using commercial glass pH electrodes on large volume samples.
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Affiliation(s)
- Korbua Chaisiwamongkhol
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QZ, UK.
| | - Christopher Batchelor-McAuley
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QZ, UK.
| | - Richard G Compton
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QZ, UK.
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Roy S, David-Pur M, Hanein Y. Carbon Nanotube-Based Ion Selective Sensors for Wearable Applications. ACS APPLIED MATERIALS & INTERFACES 2017; 9:35169-35177. [PMID: 28925684 DOI: 10.1021/acsami.7b07346] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Wearable electronics offer new opportunities in a wide range of applications, especially sweat analysis using skin sensors. A fundamental challenge in these applications is the formation of sensitive and stable electrodes. In this article we report the development of a wearable sensor based on carbon nanotube (CNT) electrode arrays for sweat sensing. Solid-state ion selective electrodes (ISEs), sensitive to Na+ ions, were prepared by drop coating plasticized poly(vinyl chloride) (PVC) doped with ionophore and ion exchanger on CNT electrodes. The ion selective membrane (ISM) filled the intertubular spaces of the highly porous CNT film and formed an attachment that was stronger than that achieved with flat Au, Pt, or carbon electrodes. Concentration of the ISM solution used influenced the attachment to the CNT film, the ISM surface morphology, and the overall performance of the sensor. Sensitivity of 56 ± 3 mV/decade to Na+ ions was achieved. Optimized solid-state reference electrodes (REs), suitable for wearable applications, were prepared by coating CNT electrodes with colloidal dispersion of Ag/AgCl, agarose hydrogel with 0.5 M NaCl, and a passivation layer of PVC doped with NaCl. The CNT-based REs had low sensitivity (-1.7 ± 1.2 mV/decade) toward the NaCl solution and high repeatability and were superior to bare Ag/AgCl, metals, carbon, and CNT films, reported previously as REs. CNT-based ISEs were calibrated against CNT-based REs, and the short-term stability of the system was tested. We demonstrate that CNT-based devices implemented on a flexible support are a very attractive platform for future wearable technology devices.
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Affiliation(s)
- Soumyendu Roy
- School of Electrical Engineering and ‡Tel Aviv University Center for Nanoscience and Nanotechnology, Tel Aviv University , Tel Aviv 69978, Israel
| | - Moshe David-Pur
- School of Electrical Engineering and ‡Tel Aviv University Center for Nanoscience and Nanotechnology, Tel Aviv University , Tel Aviv 69978, Israel
| | - Yael Hanein
- School of Electrical Engineering and ‡Tel Aviv University Center for Nanoscience and Nanotechnology, Tel Aviv University , Tel Aviv 69978, Israel
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McLister A, McHugh J, Cundell J, Davis J. New Developments in Smart Bandage Technologies for Wound Diagnostics. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2016; 28:5732-7. [PMID: 26821765 DOI: 10.1002/adma.201504829] [Citation(s) in RCA: 74] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2015] [Revised: 11/02/2015] [Indexed: 05/22/2023]
Abstract
The pH of wound fluid has long been recognized as an important diagnostic for assessing wound condition, but as yet there are few technological options available to the clinician. The availability of sensors that can measure wound pH, either in the clinic or at home could significantly improve clinical outcome - particularly in the early identification of complications such as infection. New material designs and electrochemical research strategies that are being targeted at wound diagnostics are identified and a critical overview of emerging research that could be pivotal in setting the direction for future devices is provided.
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Affiliation(s)
- Anna McLister
- School of Engineering, University of Ulster, Jordanstown, Northern Ireland, BT37 0QB, UK
| | - Jolene McHugh
- School of Engineering, University of Ulster, Jordanstown, Northern Ireland, BT37 0QB, UK
| | - Jill Cundell
- School of Health Sciences, University of Ulster, Jordanstown, Northern Ireland, BT37 0QB, UK
| | - James Davis
- School of Engineering, University of Ulster, Jordanstown, Northern Ireland, BT37 0QB, UK
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McLister A, Davis J. Molecular Wiring in Smart Dressings: Opening a New Route to Monitoring Wound pH. Healthcare (Basel) 2015; 3:466-77. [PMID: 27417774 PMCID: PMC4939565 DOI: 10.3390/healthcare3030466] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Revised: 06/07/2015] [Accepted: 06/15/2015] [Indexed: 11/18/2022] Open
Abstract
It has been proposed that fluctuations in wound pH can give valuable insights into the healing processes in chronic wounds, but acquiring such data can be a technological challenge especially where there is little sample available. Developments in voltammetric pH sensing have opened up new avenues for the design of probes that can function in ultra-small volumes and can be inherently disposable but, as yet few can meet the demands of wound monitoring. A preliminary investigation of the pH response of a new redox wire prepared from a peptide homopolymer of tryptophan is presented and its potential applicability as a sensing material for use in smart dressings is critically discussed.
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Affiliation(s)
- Anna McLister
- School of Engineering, Ulster University, Jordanstown BT37 0QB, UK.
| | - James Davis
- School of Engineering, Ulster University, Jordanstown BT37 0QB, UK.
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Anderson A, Phair J, Benson J, Meenan B, Davis J. Investigating the use of endogenous quinoid moieties on carbon fibre as means of developing micro pH sensors. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2014; 43:533-7. [DOI: 10.1016/j.msec.2014.07.038] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Revised: 06/02/2014] [Accepted: 07/13/2014] [Indexed: 11/30/2022]
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8
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Opportunities and challenges of using ion-selective electrodes in environmental monitoring and wearable sensors. Electrochim Acta 2012. [DOI: 10.1016/j.electacta.2012.04.147] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Sinusoidal voltage electrodeposition and characterization of conducting polymers on gold microelectrode arrays. J Electroanal Chem (Lausanne) 2012. [DOI: 10.1016/j.jelechem.2012.09.035] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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10
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Dillingham PW, Radu T, Diamond D, Radu A, McGraw CM. Bayesian Methods for Ion Selective Electrodes. ELECTROANAL 2012. [DOI: 10.1002/elan.201100510] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Lupu S. New Developments in Electrochemical Sensors Based on Poly(3,4-ethylenedioxythiophene)-Modified Electrodes. INTERNATIONAL JOURNAL OF ELECTROCHEMISTRY 2011. [DOI: 10.4061/2011/508126] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
There is a growing demand for continuous, fast, selective, and sensitive monitoring of key analytes and parameters in the control of diseases and health monitoring, foods quality and safety, and quality of the environment. Sensors based on electrochemical transducers represent very promising tools in this context. Conducting polymers (CPs) have drawn considerable interest in recent years because of their potential applications in different fields such as in sensors, electrochemical displays, and in catalysis. Among the organic conducting polymers, poly(3,4-ethylenedioxythiophene) (PEDOT) and its derivatives have attracted particular interest due to their high stability and high conductivity. This paper summarizes mainly the recent developments in the use of PEDOT-based composite materials in electrochemical sensors.
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Affiliation(s)
- Stelian Lupu
- Department of Analytical Chemistry and Instrumental Analysis, Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, Polizu 1-7, 011061 Bucharest, Romania
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