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Rezaei, B., Shoushtari, A. M., Rabiee, M., Uzun, L., Wing Cheung, M. & TURNER, A. (2018). An electrochemical immunosensor for cardiac Troponin I using electrospun carboxylated multi-walled carbon nanotube-whiskered nanofibres. Talanta: The International Journal of Pure and Applied Analytical Chemistry, 182, 178-186
Open this publication in new window or tab >>An electrochemical immunosensor for cardiac Troponin I using electrospun carboxylated multi-walled carbon nanotube-whiskered nanofibres
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2018 (English)In: Talanta: The International Journal of Pure and Applied Analytical Chemistry, ISSN 0039-9140, E-ISSN 1873-3573, Vol. 182, p. 178-186Article in journal (Refereed) Published
Abstract [en]

A sandwich-type nanostructured immunosensor based on carboxylated multi-walled carbon nanotube (CMWCNT)-embedded whiskered nanofibres (WNFs) was developed for detection of cardiac Troponin I (cTnI). WNFs were directly fabricated on glassy carbon electrodes (GCE) by removing the sacrificial component (polyethylene glycol, PEG) after electrospinning of polystyrene/CMWCNT/PEG nanocomposite nanofibres, and utilised as a transducer layer for enzyme-labeled amperometric immunoassay of cTnI. The whiskered segments of CMWCNTs were activated and utilised to immobilise anti-cTnT antibodies. It was observed that the anchored CMWCNTs within the nanofibres were suitably stabilised with excellent electrochemical repeatability. A sandwich-type immuno-complex was formed between cTnI and horseradish peroxidase-conjugated anti-cTnI (HRP-anti-cTnI). The amperometric responses of the immunosensor were studied using cyclic voltammetry (CV) through an enzymatic reaction between hydrogen peroxide and HRP conjugated to the secondary antibody. The nanostructured immunosensor delivered a wide detection range for cTnI from the clinical borderline for a normal person (0.5-2 ng mL(-1)) to the concentration present in myocardial infarction patients (amp;gt; 20 ng mL(-1)), with a detection limit of similar to 0.04 ng mL(-1). It also showed good reproducibility and repeatability for three different cTnI concentration (1, 10 and 25 ng mL(-1)) with satisfactory relative standard deviations (RSD). Hence, the proposed nanostructured immunosensor shows potential for point-of-care testing.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Immunosensor; Cardiac Troponin I; Carbon nanotubes; Electrospinning; Whiskered nanofibres
National Category
Analytical Chemistry
Identifiers
urn:nbn:se:liu:diva-147365 (URN)10.1016/j.talanta.2018.01.046 (DOI)000428229200021 ()29501138 (PubMedID)2-s2.0-85042645620 (Scopus ID)
Note

Funding Agencies|Ministry of Science, Research and Technology of Iran; European Commission [PIEF-GA-2013.629251]

Available from: 2018-05-18 Created: 2018-05-18 Last updated: 2018-06-28Bibliographically approved
Liu, Y., Turner, A., Zhao, M. & Wing Cheung, M. (2018). Facile synthesis of highly processable and water dispersible polypyrrole and poly(3,4-ethylenedioxythiophene) microspheres for enhanced supercapacitive performance. European Polymer Journal, 99, 332-339
Open this publication in new window or tab >>Facile synthesis of highly processable and water dispersible polypyrrole and poly(3,4-ethylenedioxythiophene) microspheres for enhanced supercapacitive performance
2018 (English)In: European Polymer Journal, ISSN 0014-3057, E-ISSN 1873-1945, Vol. 99, p. 332-339Article in journal (Refereed) Published
Abstract [en]

Much recent work has focused on improving the processibility and electrocapacitive performance of conducting polymer-based materials for energy related applications. The key mechanism of conducting polymers as supercapacitor materials is driven by the rapid charging and discharging processes that involve mass transport of the counter ions insertion/ejection within the polymer structure, where ion diffusion is usually the limiting step on the efficiency of the conducting polymer capacitor. Here, we report a facile method for the green fabrication of polypyrrole microspheres (PPy-MSs) and poly (3, 4-ethylenedioxythiophene) microspheres (PEDOT-MSs) with good processability, intact morphology and large active surface for enhanced ion interchange processes, without using surfactant and highly irritant or toxic organic solvents during the synthetic process. The structure and morphology of the PPy-MSs and PEDOT-MSs were characterized by means of SEM, EDX, TEM and FTIR. Both PPy-MSs and PEDOT-MSs showed intact microsphere structures with greatly improved water dispersity and processability. More importantly, facilated by the large active surface and inter-microsphere space for ions diffusion, both the PPy-MSs and PEDOT-MSs showed a signiciantly enhanced electrical capacitive performance of 242 F g(-1) and 91.2 F g(-1), repsectively (i.e. 10 and 1.51 times in specific capacitance than the randomly structured PPy and PEDOT). This innovative approach not only addresses fundamental issues in fabrication of high performance processable microstructured conducting polymers, but also makes progress in delivering water processable conducting polymers that could be potentially used for fabrication of printed electronic devices.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD, 2018
Keywords
Energy materials; Conducting polymers; Microspheres interface; Colloidal chemistry
National Category
Materials Chemistry
Identifiers
urn:nbn:se:liu:diva-147165 (URN)10.1016/j.eurpolymj.2017.12.013 (DOI)000427338100034 ()
Note

Funding Agencies|China Scholarship Council (CSC) [201406910068]; Swedish Re-search Council [VR-2015-04434]

Available from: 2018-04-12 Created: 2018-04-12 Last updated: 2018-05-18
Osikoya, A., Parlak, O., Murugan, N. .. r., Dikio, E. D., Moloto, H., Uzun, L., . . . Tiwari, A. (2017). Acetylene-sourced CVD-synthesised catalytically active graphene for electrochemical biosensing.. Biosensors & bioelectronics, 89, 496-504
Open this publication in new window or tab >>Acetylene-sourced CVD-synthesised catalytically active graphene for electrochemical biosensing.
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2017 (English)In: Biosensors & bioelectronics, ISSN 0956-5663, E-ISSN 1873-4235, Vol. 89, p. 496-504Article in journal (Refereed) Published
Abstract [en]

In this study, we have demonstrated the use of a graphene sheet as a fundamental building block to obtain a highly ordered graphene-enzyme electrode for electrochemical biosensing. Firstly, thin graphene sheets were deposited on 1.00 mm thick copper sheet at 850 oC, via chemical vapour deposition (CVD), using acetylene (C2H2) as carbon source in an argon (Ar) and nitrogen (N2) atmosphere. An anionic surfactant was used to introduce electrostatic charges and increase wettability and hydrophilicity on the basal plane of the otherwise hydrophobic graphene, thereby facilitating the assembly of biomolecules on the graphene surface. The bioelectrocatalytic activity of the system was investigated by the assembly of glucose oxidase (GOx) on the surface of the graphene sheet by intermolecular attractive forces. The electrochemical sensing activity of the graphene-based system was explored as a model for bioelectrocatalysis. The bioelectrode exhibited a linear response to glucose concentration from 0.2 to 9.8 mM, with sensitivity of 0.087 µA/µM/cm2 and a detection limit of 0.12 µM (S/N=3). This work sets the stage for the use of acetylene-sourced graphene sheets as fundamental building blocks in the fabrication of electrochemical biosensors and other biocatalytic devices.

Place, publisher, year, edition, pages
Elsevier, 2017
Keywords
CVD-graphene, bioelectronics, theoretical calculation, surfactant modification, 2D-materials
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:liu:diva-128195 (URN)10.1016/j.bios.2016.03.063 (DOI)000391077000048 ()27157880 (PubMedID)
Note

Funding agencies: Swedish Research Council, Sweden [VR-2011-6058357]; Research Directorate of the Vaal University of Technology, South Africa

Available from: 2016-05-20 Created: 2016-05-20 Last updated: 2017-11-30
Turner, A. (2017). Biosensors – Towards Frictionless Management of Health.. In: : . Paper presented at Joint conference of the European Medical and Biological Engineering Conference (EMBEC) and the Nordic-Baltic Conference on Biomedical Engineering and Medical Physics (NBC). Tampere, Finland, 11-15 June 2017.. EMBEC & NBC
Open this publication in new window or tab >>Biosensors – Towards Frictionless Management of Health.
2017 (English)Conference paper, Oral presentation with published abstract (Refereed)
Place, publisher, year, edition, pages
EMBEC & NBC, 2017
National Category
Biological Sciences
Identifiers
urn:nbn:se:liu:diva-137658 (URN)
Conference
Joint conference of the European Medical and Biological Engineering Conference (EMBEC) and the Nordic-Baltic Conference on Biomedical Engineering and Medical Physics (NBC). Tampere, Finland, 11-15 June 2017.
Available from: 2017-05-23 Created: 2017-05-23 Last updated: 2017-06-15Bibliographically approved
Turner, A. (2017). Biosensors for diabetes: how far have we come?Asian Advanced Materials Congress 2017.. In: Asian Advanced Materials Congress 2017.: . Paper presented at Asian Advanced Materials Congress 2017. 11-16 March 2017, Singapore.. VBRI
Open this publication in new window or tab >>Biosensors for diabetes: how far have we come?Asian Advanced Materials Congress 2017.
2017 (English)In: Asian Advanced Materials Congress 2017., VBRI , 2017Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
VBRI, 2017
National Category
Biological Sciences
Identifiers
urn:nbn:se:liu:diva-137655 (URN)
Conference
Asian Advanced Materials Congress 2017. 11-16 March 2017, Singapore.
Note

DOI does not work: 10.5185/asamc.2017

Available from: 2017-05-23 Created: 2017-05-23 Last updated: 2018-02-22Bibliographically approved
Turner, A. (2017). Biosensors: how to achieve the ultimate in performance with the simplest of devices.: Cell Biology Plenary Lecture. In: : . Paper presented at Society for Experimental Biology (SEB Gothenburg 2017), Swedish Exhibition Centre, Gothenburg, Sweden. 3-6 July 2017. . Society for Experimental Biology, London.
Open this publication in new window or tab >>Biosensors: how to achieve the ultimate in performance with the simplest of devices.: Cell Biology Plenary Lecture
2017 (English)Conference paper, Oral presentation with published abstract (Refereed)
Place, publisher, year, edition, pages
. Society for Experimental Biology, London., 2017
National Category
Biological Sciences
Identifiers
urn:nbn:se:liu:diva-137659 (URN)
Conference
Society for Experimental Biology (SEB Gothenburg 2017), Swedish Exhibition Centre, Gothenburg, Sweden. 3-6 July 2017
Available from: 2017-05-23 Created: 2017-05-23 Last updated: 2017-06-15Bibliographically approved
Parlak, O., Mishra, Y. K., Grigoriev, A., Mecklenburg, M., Luo, W., Keene, S., . . . Tiwari, A. (2017). Hierarchical Aerographite Nano-Microtubular Tetrapodal Networks based Electrodes as Lightweight Supercapacitor.. Nano Energy, 34, 570-577
Open this publication in new window or tab >>Hierarchical Aerographite Nano-Microtubular Tetrapodal Networks based Electrodes as Lightweight Supercapacitor.
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2017 (English)In: Nano Energy, ISSN 2211-2855, E-ISSN 2211-3282, Vol. 34, p. 570-577Article in journal (Refereed) Published
Abstract [en]

A great deal of interest has been paid to the application of carbon-based nano- and microstructured materials as electrodes due to their relatively low-cost production, abundance, large surface area, high chemical stability, wide operating temperature range, and ease of processing including many more excellent features. The nanostructured carbon materials usually offer various micro-textures due to their varying degrees of graphitisation, a rich variety in terms of dimensionality as well as morphologies, extremely large surface accessibility and high electrical conductivity, etc. The possibilities of activating them by chemical and physical methods allow these materials to be produced with further higher surface area and controlled distribution of pores from nanoscale upto macroscopic dimensions, which actually play the most crucial role towards construction of the efficient electrode/electrolyte interfaces for capacitive processes in energy storage applications. Development of new carbon materials with extremely high surface areas could exhibit significant potential in this context and motivated by this in present work, we report for the first time the utilization of ultralight and extremely porous nano-microtubular Aerographite  tetrapodal network as a functional interface to probe the electrochemical properties for capacitive energy storage. A simple and robust electrode fabrication strategy based on surface functionalized Aerographite with optimum porosity leads to significantly high specific capacitance (640 F/g) with high energy (14.2 Wh/kg) and power densities (9.67x103 W/kg) which has been discussed in detail.

Place, publisher, year, edition, pages
Elsevier, 2017
Keywords
Hierarchical nanocarbons; tubular Aerographite; electrodes; porous interfaces; supercapacitors.
National Category
Materials Chemistry
Identifiers
urn:nbn:se:liu:diva-137651 (URN)10.1016/j.nanoen.2017.03.004 (DOI)000400383300061 ()2-s2.0-85015670974 (Scopus ID)
Funder
Knut and Alice Wallenberg Foundation, KAW 2014.0387
Available from: 2017-05-23 Created: 2017-05-23 Last updated: 2017-06-15Bibliographically approved
Korpan, Y. I., Turner, A. & El'skaya, A. (2017). Metabolomics on Electrodes – A New Evolutionary Step in Sensing and Sensitivity.. In: European Advanced Materials Congress 2017: . Paper presented at European Advanced Materials Congress 2017, Stockholm, Sweden.. VBRI
Open this publication in new window or tab >>Metabolomics on Electrodes – A New Evolutionary Step in Sensing and Sensitivity.
2017 (English)In: European Advanced Materials Congress 2017, VBRI , 2017Conference paper, Oral presentation with published abstract (Refereed)
Place, publisher, year, edition, pages
VBRI, 2017
National Category
Medical Biotechnology
Identifiers
urn:nbn:se:liu:diva-137656 (URN)
Conference
European Advanced Materials Congress 2017, Stockholm, Sweden.
Available from: 2017-05-23 Created: 2017-05-23 Last updated: 2017-06-15Bibliographically approved
Turner, A. (2017). Single-molecule electroanalysis and printed electronic systems.. In: : . Paper presented at 5th International Conference on Bio-Sensing Technology, Riva Del Garda, Italy. 7-10 May 2017. Oxford, UK: Elsevier, Article ID 0014.
Open this publication in new window or tab >>Single-molecule electroanalysis and printed electronic systems.
2017 (English)Conference paper, Oral presentation with published abstract (Refereed)
Place, publisher, year, edition, pages
Oxford, UK: Elsevier, 2017
National Category
Biological Sciences
Identifiers
urn:nbn:se:liu:diva-137657 (URN)
Conference
5th International Conference on Bio-Sensing Technology, Riva Del Garda, Italy. 7-10 May 2017
Available from: 2017-05-23 Created: 2017-05-23 Last updated: 2017-06-15Bibliographically approved
Mishra, S., Ashaduzzaman, M., Mishra, P., Swart, H., Turner, A. & Tiwari, A. (2017). Stimuli-enabled zipper-like graphene interface for auto-switchable bioelectronics.. Biosensors & bioelectronics, 89, 305-311
Open this publication in new window or tab >>Stimuli-enabled zipper-like graphene interface for auto-switchable bioelectronics.
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2017 (English)In: Biosensors & bioelectronics, ISSN 0956-5663, E-ISSN 1873-4235, Vol. 89, p. 305-311Article in journal (Refereed) Published
Abstract [en]

Graphene interfaces with multi-stimuli responsiveness are of particular interest due to their diverse super-thin interfacial behaviour, which could be well suited to operating complex physiological systems in a single miniaturised domain. In general, smart graphene interfaces switch bioelectrodes from the hydrophobic to hydrophilic state, or vice versa, upon triggering. In the present work, a stimuli encoded zipper-like graphene oxide (GrO)/polymer interface was fabricated with in situ poly(N-isopropylacrylamide–co–diethylaminoethylmethylacrylate), i.e., poly(NIPAAm–co–DEAEMA) directed hierarchical self-assembly of GrO and glucose oxidase (GOx). The designed interface exhibited reversible on/off-switching of bio-electrocatalysis on changing the pH between 5 and 8, via phase transition from super hydrophilic to hydrophobic. The study further indicated that the zipper-like interfacial bioelectrochemical properties could be tuned over a modest change of temperature (i.e., 20–40 °C). The resulting auto-switchable interface has implications for the design of novel on/off-switchable biodevices with ‘in-built’ self-control.

Place, publisher, year, edition, pages
Elsevier, 2017
Keywords
Triggered interfaces; Graphene bioelectronics; Smart Bioelectrocatalysis; On/off-switchable bio-devices
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:liu:diva-128196 (URN)10.1016/j.bios.2016.03.052 (DOI)000391077000023 ()27132998 (PubMedID)
Available from: 2016-05-20 Created: 2016-05-20 Last updated: 2018-03-23
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-1815-9699

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