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Tiwari, Ashutosh
Publications (10 of 98) Show all publications
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
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: 2018-10-08Bibliographically 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
Ali Kamyabi, M., Hajari, N., Turner, A. & Tiwari, A. (2016). Correction: A high-performance glucose biosensor using covalently immobilised glucose oxidase on a poly(2,6-diaminopyridine)/carbon nanotube electrode (vol 116, pg 801, 2013). Talanta: The International Journal of Pure and Applied Analytical Chemistry, 153, 414-415
Open this publication in new window or tab >>Correction: A high-performance glucose biosensor using covalently immobilised glucose oxidase on a poly(2,6-diaminopyridine)/carbon nanotube electrode (vol 116, pg 801, 2013)
2016 (English)In: Talanta: The International Journal of Pure and Applied Analytical Chemistry, ISSN 0039-9140, E-ISSN 1873-3573, Vol. 153, p. 414-415Article in journal (Refereed) Published
Abstract [en]

A highly-sensitive glucose biosensor amenable to ultraminiaturisation was fabricated by immobilization of glucose oxidase (wGOX), onto a poly(2,6-diaminopyridine)/multi-walled carbon nanotube/glassy carbon electrode (poly(2,6-DP)/MWCNT/GCE). Cyclic voltammetry was used for both the electrochemical synthesis of poly-(2,6-DP) on the surface of a MWCNT-modified GC electrode, and characterization of the polymers deposited on the GC electrode. The synergistic effect of the high active surface area of both the conducting-polymer, i.e., poly-(2,6-DP) and MWCNT gave rise to a remarkable improvement in the electrocatalytic properties of the biosensor. The transfer coefficient (alpha), heterogeneous electron transfer rate constant and Michaelis-Menten constant were calculated to be 0.6, 4 s-1 and 0.22 mM at pH 7.4, respectively. The GOx/poly(2,6-DP)/MWCNT/GC bioelectrode exhibited two linear responses to glucose in the concentration ranging from 0.42 mu M to 8.0 mM with a correlation coefficient of 0.95, sensitivity of 52.0 mu AmM-1 cm-2, repeatability of 1.6% and long-term stability, which could make it a promising bioelectrode for precise detection of glucose in the biological samples. (C) 2016 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV, 2016
Keywords
Glucose biosensor; Electron transfer; Glucose oxidase; MWNT/poly-(2, 6-diaminopyridine)
National Category
Inorganic Chemistry
Identifiers
urn:nbn:se:liu:diva-129149 (URN)10.1016/j.talanta.2016.02.028 (DOI)000376052900055 ()27130136 (PubMedID)
Available from: 2016-06-13 Created: 2016-06-13 Last updated: 2017-11-28
Tiwari, A., Mishra, Y. K., Kobayashi, H. & Turner, A. (Eds.). (2016). Intelligent Nanomaterials, 2nd Edition.. USA: Wiley-Scrivener
Open this publication in new window or tab >>Intelligent Nanomaterials, 2nd Edition.
2016 (English)Collection (editor) (Refereed)
Abstract [en]

Overall, this book presents a detailed and comprehensive overview of the state-of-the-art development of different nanoscale intelligent materials for advanced applications. Apart from fundamental aspects of fabrication and characterization of nanomaterials, it also covers key advanced principles involved in utilization of functionalities of these nanomaterials in appropriate forms. It is very important to develop and understand the cutting-edge principles of how to utilize nanoscale intelligent features in the desired fashion. These unique nanoscopic properties can either be accessed when the nanomaterials are prepared in the appropriate form, e.g., composites, or in integrated nanodevice form for direct use as electronic sensing devices. In both cases, the nanostructure has to be appropriately prepared, carefully handled, and properly integrated into the desired application in order to efficiently access its intelligent features. These aspects are reviewed in detail in three themed sections with relevant chapters: Nanomaterials, Fabrication and Biomedical Applications; Nanomaterials for Energy, Electronics, and Biosensing; Smart Nanocomposites, Fabrication, and Applications.

Place, publisher, year, edition, pages
USA: Wiley-Scrivener, 2016. p. 592
National Category
Composite Science and Engineering
Identifiers
urn:nbn:se:liu:diva-137653 (URN)978-1-119-24248-2 (ISBN)
Available from: 2017-05-23 Created: 2017-05-23 Last updated: 2017-06-02Bibliographically approved
Parlak, O., Beyazit, S., Jafari, M. J., Tse Sum Bui, B., Haupt, K., Tiwari, A. & Turner, A. (2016). Light-triggered switchable graphene-polymer hybrid bioelectronics. Advanced Materials Interfaces, 3(2), 1500353-1-1500353-7
Open this publication in new window or tab >>Light-triggered switchable graphene-polymer hybrid bioelectronics
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2016 (English)In: Advanced Materials Interfaces, ISSN 2196-7350, Vol. 3, no 2, p. 1500353-1-1500353-7Article in journal (Refereed) Published
Abstract [en]

A light-switchable graphene interface to control and regulate electrobiocatalysis in a nanoconfined space is reported for the first time. The development of switchable and/or tunable interfaces on 2D nanosurfaces endowed with desirable functionalities, and incorporation of these interfaces into remote controlled biodevices, is a rapidly emerging area in bioelectronics.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2016
Keywords
light-switchable electrobiocatalysis;remote controlled biodevices;smart graphene;stimuli-encoded bioelectronics
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:liu:diva-123676 (URN)10.1002/admi.201500353 (DOI)000370043000002 ()
Projects
VR- 2011-6058357
Funder
Swedish Research Council, VR- 2011-6058357
Note

Fundinmg agencies:  Swedish Research Council [VR-2011-6058357]; European Commission [MCITN-2011-289554]

Available from: 2016-01-07 Created: 2016-01-07 Last updated: 2017-01-11Bibliographically approved
Tiwari, A., Mishra, Y. K., Kobayashi, H. & Turner, A. (2016). Preface. In: Tiwari, A., Mishra, Y.K., Kobayashi, H., Turner, A.P.F. (Ed.), Intelligent Nanomaterials, 2nd Edition.: (pp. xvii-xx). USA: Wiley-Scrivener
Open this publication in new window or tab >>Preface
2016 (English)In: Intelligent Nanomaterials, 2nd Edition. / [ed] Tiwari, A., Mishra, Y.K., Kobayashi, H., Turner, A.P.F., USA: Wiley-Scrivener , 2016, p. xvii-xxChapter in book (Refereed)
Place, publisher, year, edition, pages
USA: Wiley-Scrivener, 2016
National Category
Composite Science and Engineering
Identifiers
urn:nbn:se:liu:diva-137654 (URN)978-1-119-24248-2 (ISBN)
Available from: 2017-05-23 Created: 2017-05-23 Last updated: 2017-06-02Bibliographically approved
Parlak, O., Beyazit, S., Tse Sum Bui, B., Haupt, K., Turner, A. & Tiwari, A. (2016). Programmable bioelectronics in a stimuli-encoded 3D graphene interfaces. Nanoscale, 8, 9976-9981
Open this publication in new window or tab >>Programmable bioelectronics in a stimuli-encoded 3D graphene interfaces
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2016 (English)In: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, Vol. 8, p. 9976-9981Article in journal (Refereed) Published
Abstract [en]

The ability to program and mimic the dynamic microenvironment of living organisms is a crucial step towards the engineering of advanced bioelectronics. Here, we report for the first time a design for programmable bioelectronics, with ‘built-in’ switchable and tunable bio-catalytic performance that responds simultaneously to appropriate stimuli. The designed bio-electrodes comprise light and temperature responsive compartments, which allow the building of Boolean logic gates (i.e. “OR” and “AND”) based on enzymatic communications to deliver logic operations.

Place, publisher, year, edition, pages
RSC Publishing, 2016
National Category
Other Physics Topics
Identifiers
urn:nbn:se:liu:diva-128194 (URN)10.1039/C6NR02355J (DOI)000376047200005 ()27121984 (PubMedID)
Funder
Swedish Research Council
Note

Funding agencies: Swedish Research Council [VR- 2011-6058357]; European Commission [NANODRUG: MCITN-2011-289554]

Available from: 2016-05-20 Created: 2016-05-20 Last updated: 2017-11-30
Karimian, N., Hossein Arbab Zavar, M., Chamsaz, M., Ashraf, N., Turner, A. & Tiwari, A. (2015). A potential-gated molecularly imprinted smart electrode for nicotinamide analysis. RSC Advances, 5(44), 35089-35096
Open this publication in new window or tab >>A potential-gated molecularly imprinted smart electrode for nicotinamide analysis
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2015 (English)In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 5, no 44, p. 35089-35096Article in journal (Refereed) Published
Abstract [en]

Triggered surface responsiveness paves the way for smart sensor technologies that not only have tunable retention, but also provide sensing through a built-in programming of electrode material. In this study, we report a potential-gated electrochemical sensor for determination of nicotinamide (NAM) based on a molecularly imprinted overoxidised polypyrrole electrode. The sensitive layer was prepared by electropolymerisation of pyrrole on a glassy carbon electrode in the presence of NAM as a template molecule, followed by alkali extraction. Electrochemical methods were used to monitor the processes of electropolymerisation, template removal and binding in the presence of a [Fe(CN)(6)](3-)/[Fe(CN)(6)](4-) redox couple as an electrochemical probe. Several factors affecting the performance of the MIP-modified electrode were investigated and optimized. The peak current of the ferro/ferricyanide couple decreased linearly with successive addition of NAM in the concentration range 0.9 x 10(-6) to 9.9 x 10(-3) M with a detection limit of 1.7 x 10(-7) M (S/N = 3). The molecularly-imprinted polymer (MIP) electrode had excellent recognition capability for NAM compared to structurally related molecules. Moreover, the reproducibility and repeatability of the NAM-imprinted electrode were all found to be satisfactory. The results from sample analysis confirmed the applicability of the NAM-imprinted electrode to reusable quantitative analysis in commercial pharmaceutical samples.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2015
National Category
Biological Sciences
Identifiers
urn:nbn:se:liu:diva-118069 (URN)10.1039/c5ra02697k (DOI)000353168300072 ()
Note

Funding Agencies|Swedish Research Council [VR-2011-6058357]; Ferdowsi University of Mashhad, Iran

Available from: 2015-05-20 Created: 2015-05-20 Last updated: 2017-12-04
Tiwari, A., Patra, H. & Turner, A. (Eds.). (2015). Advanced Bioelectronic Materials. Beverly, MA, USA: Wiley-Scrivener
Open this publication in new window or tab >>Advanced Bioelectronic Materials
2015 (English)Collection (editor) (Other academic)
Abstract [en]

This book covers the recent advances in the development of bioelectronics systems and their potential application in future biomedical applications starting from system design to signal processing for physiological monitoring, to in situ biosensing.

Advanced Bioelectronics Materialshas contributions from distinguished international scholars whose backgrounds mirror the multidisciplinary readership ranging from the biomedical sciences, biosensors and engineering communities with diverse backgrounds, interests and proficiency in academia and industry. The readers will benefit from the widespread coverage of the current literature, state-of-the-art overview of all facets of advanced bioelectronics materials ranging from real time monitoring, in situ diagnostics, in vivo imaging, image-guided therapeutics, biosensors, and translational biomedical devices and personalized monitoring.

Place, publisher, year, edition, pages
Beverly, MA, USA: Wiley-Scrivener, 2015. p. 500
Keywords
Advanced materials; functional materials; biosensors; bioelectronics
National Category
Other Natural Sciences
Identifiers
urn:nbn:se:liu:diva-123684 (URN)10.1002/9781118998861 (DOI)9781118998304 (ISBN)9781118998861 (ISBN)
Available from: 2016-01-08 Created: 2016-01-08 Last updated: 2016-01-14Bibliographically approved
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