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  • 1.
    Fall, Andreas
    et al.
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Zhao, Wei
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Blademo, Åsa
    RISE Research Institutes of Sweden.
    Bodelsson, Jens
    RISE Research Institutes of Sweden.
    Sugunan, Abhilash
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Nordgren, Niklas
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Abitbol, Tiffany
    RISE Research Institutes of Sweden.
    Carlmark, Anna
    RISE Research Institutes of Sweden.
    Gillgren, Thomas
    RISE Research Institutes of Sweden.
    Hybrid Materials of Nanocellulose and Graphene2019Inngår i: International Conference on Nanotechnology for Renewable Materials 2019, TAPPI Press , 2019, Vol. 2, s. 1069-1080Konferansepaper (Fagfellevurdert)
  • 2.
    Karlsson, Mikael
    et al.
    RISE., Swedish ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Wang, Qin
    RISE., Swedish ICT, Acreo.
    Zhao, Yichen
    KTH Royal Institute of Technology, Sweden.
    Zhao, Wei
    RISE., Swedish ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Toprak, Muhammet S.
    KTH Royal Institute of Technology, Sweden.
    Iakimov, Tihomir
    Graphensic AB, Sweden.
    Ali, Amer
    Graphensic AB, Sweden.
    Yakimova, Rostiza
    Graphensic AB, Sweden.
    Syväjärvi, Mikael
    Graphensic AB, Sweden.
    Ivanov, Ivan G.
    Linköping University, Sweden.
    Wafer-scale epitaxial graphene on SiC for sensing applications2015Inngår i: Wafer-scale epitaxial graphene on SiC for sensing applications, 2015, Vol. 9668, artikkel-id 96685TKonferansepaper (Fagfellevurdert)
    Abstract [en]

    The epitaxial graphene-on-silicon carbide (SiC-G) has advantages of high quality and large area coverage owing to a natural interface between graphene and SiC substrate with dimension up to 100 mm. It enables cost effective and reliable solutions for bridging the graphene-based sensors/devices from lab to industrial applications and commercialization. In this work, the structural, optical and electrical properties of wafer-scale graphene grown on 2’’ 4H semi-insulating (SI) SiC utilizing sublimation process were systemically investigated with focus on evaluation of the graphene’s uniformity across the wafer. As proof of concept, two types of glucose sensors based on SiC-G/Nafion/Glucose-oxidase (GOx) and SiC-G/Nafion/Chitosan/GOx were fabricated and their electrochemical properties were characterized by cyclic voltammetry (CV) measurements. In addition, a few similar glucose sensors based on graphene by chemical synthesis using modified Hummer’s method were also fabricated for comparison.

  • 3.
    Majee, Subimal
    et al.
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Zhao, Wei
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign. Uppsala University, Sweden.
    Sugunan, Abhilash
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Gillgren, .T
    BillerudKorsnäs AB, Sweden.
    Larsson, J. A.
    BillerudKorsnäs AB, Sweden.
    Brooke, Robert
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Nordgren, Niklas
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Zhang, Z. -B
    Uppsala University, Sweden.
    Zhang, S. -L
    Uppsala University, Sweden.
    Nilsson, David
    RISE Research Institutes of Sweden, Digitala system, Smart hårdvara.
    Ahniyaz, Anwar
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Highly Conductive Films by Rapid Photonic Annealing of Inkjet Printable Starch–Graphene Ink2021Inngår i: Advanced Materials Interfaces, ISSN 2196-7350, Vol. 9, nr 5, artikkel-id 2101884Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A general formulation engineering method is adopted in this study to produce a highly concentrated (≈3 mg mL−1) inkjet printable starch–graphene ink in aqueous media. Photonic annealing of the starch–graphene ink is validated for rapid post-processing of printed films. The experimental results demonstrate the role of starch as dispersing agent for graphene in water and photonic pulse energy in enhancing the electrical properties of the printed graphene patterns, thus leading to an electrical conductivity of ≈2.4 × 104 S m−1. The curing mechanism is discussed based on systematic material studies. The eco-friendly and cost-efficient approach presented in this work is of technical potential for the scalable production and integration of conductive graphene inks for widespread applications in printed and flexible electronics. 

  • 4.
    Zhao, Wei
    et al.
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign. Uppsala University, Sweden.
    Sugunan, Abhilash
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Gillgren, Thomas
    BillerudKorsnäs AB, Sweden.
    Larsson, Johan A
    BillerudKorsnäs AB,Sweden.
    Zhang, Zhi-Bin
    Uppsala University, Sweden.
    Zhang, Shi-Li
    Uppsala University, Sweden.
    Sommertune, Jens
    RISE Research Institutes of Sweden.
    Dobryden, Illia
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Ahniyaz, Anwar
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Surfactant-free starch-graphene composite films as simultaneous oxygen and water vapour barriers2022Inngår i: npj 2D Materials and Applications, ISSN 2397-7132, Vol. 6, nr 1, artikkel-id 20Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A single coating formulation for multifunctional composites, such as a gas barrier against both oxygen and water vapour, is the holy grail for the packaging industry. Since the last decade, graphene has been touted as the ideal barrier material in composites due to its morphology and impermeability to all gases. However, this prospect is limited by either poor dispersion of graphene or excess surfactants to aid the dispersion, both leading to shortcuts that allow gas permeation through the composite. Here, we demonstrate a combined gas barrier with starch-graphene composite films made from a single formulation of surfactant-free starch nanoparticle-stabilized graphene dispersion (2.97 mg mL−1). Hence, the incorporated graphene reduces the permeability of both the oxygen and the water vapour by over 70% under all the relative humidity conditions tested. Moreover, these films are foldable and electrically conductive (9.5 S m−1). Our surfactant-free approach of incorporating graphene into an industrially important biopolymer is highly relevant to the packaging industry, thus offering cost-effective and water-based solution depositions of multifunctional composite films for wide-ranging applications, such as gas barriers in food packaging. © 2022, The Author(s).

  • 5.
    Zhao, Wei
    et al.
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Sugunan, Abhilash
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Gillgren, Thomas
    BillerudKorsnäs AB, Sweden.
    Larsson, Johan
    BillerudKorsnäs AB, Sweden.
    Zhang, Zhi-Bin
    Uppsala University, Sweden.
    Zhang, Shi-Li
    Uppsala University, Sweden.
    Niklas, Nordgren
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Sommertune, Jens
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Ahniyaz, Anwar
    RISE Research Institutes of Sweden, Bioekonomi och hälsa, Material- och ytdesign.
    Surfactant-Free Stabilization of Aqueous Graphene Dispersions Using Starch as a Dispersing Agent2021Inngår i: ACS Omega, E-ISSN 2470-1343, Vol. 6, nr 18, s. 12050-12062Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Attention to graphene dispersions in water with the aid of natural polymers is increasing with improved awareness of sustainability. However, the function of biopolymers that can act as dispersing agents in graphene dispersions is not well understood. In particular, the use of starch to disperse pristine graphene materials deserves further investigation. Here, we report the processing conditions of aqueous graphene dispersions using unmodified starch. We have found that the graphene content of the starch-graphene dispersion is dependent on the starch fraction. The starch-graphene sheets are few-layer graphene with a lateral size of 3.2 μm. Furthermore, topographical images of these starch-graphene sheets confirm the adsorption of starch nanoparticles with a height around 5 nm on the graphene surface. The adsorbed starch nanoparticles are ascribed to extend the storage time of the starch-graphene dispersion up to 1 month compared to spontaneous aggregation in a nonstabilized graphene dispersion without starch. Moreover, the ability to retain water by starch is reduced in the presence of graphene, likely due to environmental changes in the hydroxyl groups responsible for starch-water interactions. These findings demonstrate that starch can disperse graphene with a low oxygen content in water. The aqueous starch-graphene dispersion provides tremendous opportunities for environmental-friendly packaging applications. © 2021 American Chemical Society.

  • 6.
    Zhao, Wei
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Biovetenskap och material, Yta, process och formulering. Uppsala University, Sweden.
    Sugunan, Abhilash
    RISE - Research Institutes of Sweden (2017-2019), Biovetenskap och material, Yta, process och formulering.
    Zhang, Zhi-Bin
    Uppsala University, Sweden.
    Ahniyaz, Anwar
    RISE - Research Institutes of Sweden (2017-2019), Biovetenskap och material, Yta, process och formulering.
    Graphene and Flavin Mononucleotide Interaction in Aqueous Graphene Dispersions2019Inngår i: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 123, nr 43, s. 26282-26288Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A fundamental understanding of the interaction between graphene and a stabilizer is needed for the development of stable aqueous graphene dispersions. Here, we studied the interaction of graphene with the FMN in water. The UV-vis absorption spectra revealed blue shifts of the FMN absorption bands II (374 nm) and I (445 nm) in the presence of graphene. Furthermore, Fourier transform IR anal. showed that the graphene also upshifted the FMN vibration modes C10a=N1 and C4a=N5, which correspond to the FMN isoalloxazine binding sites N(1) and N(5), resp. In addition, thermogravimetric anal. showed that the thermal stability of graphene was enhanced by the adsorbed FMN, which supports the strong interaction. These results confirm that FMN adsorbs on the graphene surface in parallel conformation and hinders hydrogen bonding at the FMN isoalloxazine binding sites.

  • 7.
    Zhao, Wei
    et al.
    RISE., Swedish ICT, Acreo. KTH Royal Institute of Technology, Sweden.
    Zhao, Yichen
    KTH Royal Institute of Technology, Sweden.
    Karlsson, Mikael
    RISE., Swedish ICT, Acreo.
    Wang, Qin
    RISE., Swedish ICT, Acreo.
    Toprak, Muhammet S.
    KTH Royal Institute of Technology, Sweden.
    Evaluation of Zinc Oxide Nano-Microtetrapods for Biomolecule2015Inngår i: Micro+Nano Materials, Devices, and Systems / [ed] Benjamin J. Eggleton, Stefano Palomba, 2015, Vol. 9668, artikkel-id 966833Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Zinc oxide tetrapods (ZnO-Ts) were synthesized by flame transport synthesis using Zn microparticles. This work herein reports a systematical study on the structural, optical and electrochemical properties of the ZnO-Ts. The morphology of the ZnO-Ts was confirmed by scanning electron microscopy (SEM) as joint structures of four nano-microstructured legs, of which the diameter of each leg is 0.7-2.2 μm in average from the tip to the stem. The ZnO-Ts were dispersed in glucose solution to study the luminescence as well as photocatalytic activity in a mimicked biological environment. The photoluminescence (PL) intensity in the ultraviolet (UV) region quenches with linear dependence to increased glucose concentration up to 4 mM. The ZnO-Ts were also attached with glucose oxidase (GOx) and over coated with a thin film of Nafion to form active layers for electrochemical glucose sensing. The attachment of GOx and coating of Nafion were confirmed by infrared spectroscopy (FT-IR). Furthermore, the current response of the active layers based on ZnO-Ts was investigated by cyclic voltammetry (CV) in various glucose concentrations. Stable current response of glucose was detected with linear dependence to glucose concentration up to 12 mM, which confirms the potential of ZnO-Ts for biomolecule sensing applications.

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