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Template-Directed Hierarchical Self-Assembly of Graphene Based Hybrid Structure for Electrochemical Biosensing
Linköping University, Department of Physics, Chemistry and Biology, Biosensors and Bioelectronics. Linköping University, The Institute of Technology.
Hawaii Corrosion Laboratory, Department of Mechanical Engineering, University of Hawaii at Manoa, 96822 Hawaii, USA.
Linköping University, Department of Physics, Chemistry and Biology, Biosensors and Bioelectronics. Linköping University, The Institute of Technology.ORCID iD: 0000-0002-1815-9699
Linköping University, Department of Physics, Chemistry and Biology, Biosensors and Bioelectronics. Linköping University, The Institute of Technology.
2013 (English)In: Biosensors and Bioelectronics, ISSN 0956-5663, EISSN 1873-4235, Vol. 49, 53-62 p.Article in journal (Refereed) Published
Abstract [en]

A template-directed self-assembly approach, using functionalised graphene as a fundamental building block to obtain a hierarchically ordered graphene-enzyme-nanoparticle bioelectrode for electrochemical biosensing, is reported. An anionic surfactant was used to prepare a responsive, functional interface and direct the assembly on the surface of the graphene template. The surfactant molecules altered the electrostatic charges of graphene, thereby providing a convenient template-directed assembly approach to a free-standing planar sheet of sp(2) carbons. Cholesterol oxidase and cholesterol esterase were assembled on the surface of graphene by intermolecular attractive forces while gold nanoparticles are incorporated into the hetero-assembly to enhance the electro-bio-catalytic activity. Hydrogen peroxide and cholesterol were used as two representative analytes to demonstrate the electrochemical sensing performance of the graphene-based hybrid structure. The bioelectrode exhibited a linear response to H2O2 from 0.01 to 14 mM, with a detection limit of 25 nM (S/N=3). The amperometric response with cholesterol had a linear range from 0.05 to 0.35 mM, sensitivity of 3.14 mu A/mu M/cm(2) and a detection limit of 0.05 mu M. The apparent Michaelis-Menten constant (K-m(app)) was calculated to be 1.22 mM. This promising approach provides a novel methodology for template-directed bio-self-assembly over planar sp(2) carbons of a graphene sheet and furnishes the basis for fabrication of ultra-sensitive and efficient electrochemical biosensors.

Place, publisher, year, edition, pages
Elsevier, 2013. Vol. 49, 53-62 p.
National Category
Medical Laboratory and Measurements Technologies
URN: urn:nbn:se:liu:diva-91866DOI: 10.1016/j.bios.2013.04.004ISI: 000323396700009OAI: diva2:619390
Hierarchicalself-assembly, Templatedirected hybridnanomaterial, Graphene Nano-biointerface, Biosensor
Swedish Research Council, VR- 2011-6058357EU, FP7, Seventh Framework Programme, PIIF-GA-2009-254955
Available from: 2013-05-03 Created: 2013-05-03 Last updated: 2015-09-01
In thesis
1. Interfacing nanomaterials for bioelectronic applications
Open this publication in new window or tab >>Interfacing nanomaterials for bioelectronic applications
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The integration of nanomaterials between biological and electronic world has revolutionized the way of understanding how to generate functional bioelectronic device and open a new horizon for the future of bioelectronics. The use of nanomaterials as a versatile interface in the area of bioelectronics offers many practical solutions and recently outshines as an alternative method to overcome technical challenges to control and regulate the mean of communication between biological and electronics systems. Therefore, the interfacing nanomaterials yields broad platform of functional units for the integration as bioelectronic interfaces and starts to have a great importance to many fields within the life science.

In parallel with the advancements for the successful combination of biological and electronic worlds using nanotechnology in a conventional way, a new branch of switchable bioelectronics based on signal-responsive materials and related interfaces have been emerged. The switchable bioelectronics consists of functional interfaces equipped with molecular cue that able to mimic and adapt their natural environment and change physical and chemical properties on demand. These switchable interfaces are essential to develop a range of technologies to understand function and properties of biological systems such as bio-catalysis, control of ion transfer and molecular recognition used in bioelectronics systems.

This thesis focuses on both the integration of functional nanomaterials to improve electrical interfacing between biological system and electronics and also the generation of a dynamic interface having ability to respond real-life physical and chemical changes. The developing of such a dynamic interface allows one to understand how do living system probe and respond their changing environment and also help control and modulate bio-molecular interactions in a confined space using external physical and chemical stimuli. First, the integration of various nanomaterials is described to understand the effect of different surface modifications and morphologies using different materials on the basis of enzyme-based electrochemical sensing of biological analytes. Then, various switchable interfaces including temperature, light and pH, consist of graphene-enzyme and responsive polymer, are developed to control and regulate enzymebased biomolecular reactions. Finally, physically controlled programmable bio-interface which is described by “AND” and “OR” Boolean logic operations using two different stimuli on one electrode, is introduced. Together, the findings presented in this thesis lay the groundwork for the establishment switchable and programmable bioelectronics. The both approaches are promising candidates to provide key building blocks for future practical systems, as well as model systems for fundamental research.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2015. 76 p.
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1684
National Category
Biochemistry and Molecular Biology Biochemistry and Molecular Biology
urn:nbn:se:liu:diva-120990 (URN)10.3384/diss.diva-120990 (DOI)978-91-7519-028-0 (print) (ISBN)
Public defence
2015-09-07, Planck, Fysikhuset, Campus Valla, Linköping, 13:15 (English)
Available from: 2015-09-01 Created: 2015-09-01 Last updated: 2016-06-07Bibliographically approved

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