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Publications (7 of 7) Show all publications
Zhao, W., Sugunan, A., Gillgren, T., Larsson, J. A., Zhang, Z.-B., Zhang, S.-L., . . . Ahniyaz, A. (2022). Surfactant-free starch-graphene composite films as simultaneous oxygen and water vapour barriers. npj 2D Materials and Applications, 6(1), Article ID 20.
Open this publication in new window or tab >>Surfactant-free starch-graphene composite films as simultaneous oxygen and water vapour barriers
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2022 (English)In: npj 2D Materials and Applications, ISSN 2397-7132, Vol. 6, no 1, article id 20Article in journal (Refereed) Published
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).

Place, publisher, year, edition, pages
Nature Research, 2022
Keywords
Biopolymers, Composite films, Conductive films, Cost effectiveness, Dispersions, Gas permeable membranes, Oxygen, Starch, Surface active agents, Water vapor, Barrier material, Coating formulations, Gas barrier, Graphene composites, Multifunctional composites, Oxygen vapors, Packaging industry, Surfactant-free, Water vapour, Water vapour barrier, Graphene
National Category
Polymer Technologies
Identifiers
urn:nbn:se:ri:diva-59006 (URN)10.1038/s41699-022-00292-x (DOI)2-s2.0-85126771096 (Scopus ID)
Note

Funding details: Stiftelsen för Strategisk Forskning, SSF, FID-15-0105; Funding text 1: This work was financially supported by the Swedish Foundation for Strategic Research (SSF, grant no. FID-15-0105) and BillerudKorsnäs AB. The authors thank Karin Hallstensson for support with the SEM imaging, Mikael Sundin for performing the XPS analysis and Marie Ernstsson for interpreting the data, Andreas Fall and Niklas Nordgren for insightful discussions and review of the manuscript.; Funding text 2: This work was financially supported by the Swedish Foundation for Strategic Research (SSF, grant no. FID-15-0105) and BillerudKorsna?s AB. The authors thank Karin Hallstensson for support with the SEM imaging, Mikael Sundin for performing the XPS analysis and Marie Ernstsson for interpreting the data, Andreas Fall and Niklas Nordgren for insightful discussions and review of the manuscript.

Available from: 2022-04-21 Created: 2022-04-21 Last updated: 2023-05-09Bibliographically approved
Majee, S., Zhao, W., Sugunan, A., Gillgren, .. ., Larsson, J. A., Brooke, R., . . . Ahniyaz, A. (2021). Highly Conductive Films by Rapid Photonic Annealing of Inkjet Printable Starch–Graphene Ink. Advanced Materials Interfaces, 9(5), Article ID 2101884.
Open this publication in new window or tab >>Highly Conductive Films by Rapid Photonic Annealing of Inkjet Printable Starch–Graphene Ink
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2021 (English)In: Advanced Materials Interfaces, ISSN 2196-7350, Vol. 9, no 5, article id 2101884Article in journal (Refereed) Published
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. 

Place, publisher, year, edition, pages
John Wiley and Sons Inc, 2021
Keywords
Conductive films, Flexible electronics, Graphene, Ink, Aqueous media, Curing mechanism, Dispersing agent, Electrical conductivity, Engineering methods, Formulation engineering, Graphene inks, Ink jet, Post-processing, Pulse energies, Starch
National Category
Materials Chemistry
Identifiers
urn:nbn:se:ri:diva-58169 (URN)10.1002/admi.202101884 (DOI)2-s2.0-85122063587 (Scopus ID)
Note

Funding details: Stiftelsen för Strategisk Forskning, SSF, FID‐15‐0105; Funding text 1: This work was financially supported by the Swedish Foundation for Strategic Research (SSF, grant no. FID‐15‐0105) and BillerudKorsnäs AB. The authors would like to thank Karin Hallstensson for support with the SEM measurements. The authors are also thankful to Mohammad Yusuf Mulla for supporting in the fabrication of the demonstration circuit.

Available from: 2022-01-14 Created: 2022-01-14 Last updated: 2024-03-03Bibliographically approved
Zhao, W., Sugunan, A., Gillgren, T., Larsson, J., Zhang, Z.-B., Zhang, S.-L., . . . Ahniyaz, A. (2021). Surfactant-Free Stabilization of Aqueous Graphene Dispersions Using Starch as a Dispersing Agent. ACS Omega, 6(18), 12050-12062
Open this publication in new window or tab >>Surfactant-Free Stabilization of Aqueous Graphene Dispersions Using Starch as a Dispersing Agent
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2021 (English)In: ACS Omega, E-ISSN 2470-1343, Vol. 6, no 18, p. 12050-12062Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
American Chemical Society, 2021
National Category
Physical Chemistry
Identifiers
urn:nbn:se:ri:diva-53478 (URN)10.1021/acsomega.1c00699 (DOI)2-s2.0-85106450176 (Scopus ID)
Note

Funding details: Stiftelsen för Strategisk Forskning, SSF, FID-15-0105; Funding text 1: This work was financially supported by the Swedish Foundation for Strategic Research (SSF, grant no. FID-15-0105) and BillerudKorsnäs AB. The authors thank Karin Hallstensson for support with the SEM/STEM imaging.

Available from: 2021-06-17 Created: 2021-06-17 Last updated: 2023-05-26Bibliographically approved
Zhao, W., Sugunan, A., Zhang, Z.-B. & Ahniyaz, A. (2019). Graphene and Flavin Mononucleotide Interaction in Aqueous Graphene Dispersions. The Journal of Physical Chemistry C, 123(43), 26282-26288
Open this publication in new window or tab >>Graphene and Flavin Mononucleotide Interaction in Aqueous Graphene Dispersions
2019 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 123, no 43, p. 26282-26288Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
American Chemical Society, 2019
Keywords
flavin mononucleotide interaction graphene aqueous dispersion
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-40649 (URN)10.1021/acs.jpcc.9b06442 (DOI)2-s2.0-85074434371 (Scopus ID)
Available from: 2019-11-08 Created: 2019-11-08 Last updated: 2023-05-09Bibliographically approved
Fall, A., Zhao, W., Blademo, Å., Bodelsson, J., Sugunan, A., Nordgren, N., . . . Gillgren, T. (2019). Hybrid Materials of Nanocellulose and Graphene. In: International Conference on Nanotechnology for Renewable Materials 2019: . Paper presented at International Conference on Nanotechnology for Renewable Materials 2019. Chiba. 3 June 2019 through 7 June 2019 (pp. 1069-1080). TAPPI Press, 2
Open this publication in new window or tab >>Hybrid Materials of Nanocellulose and Graphene
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2019 (English)In: International Conference on Nanotechnology for Renewable Materials 2019, TAPPI Press , 2019, Vol. 2, p. 1069-1080Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
TAPPI Press, 2019
National Category
Materials Engineering
Identifiers
urn:nbn:se:ri:diva-68229 (URN)2-s2.0-85073798897 (Scopus ID)
Conference
International Conference on Nanotechnology for Renewable Materials 2019. Chiba. 3 June 2019 through 7 June 2019
Available from: 2023-12-06 Created: 2023-12-06 Last updated: 2023-12-06Bibliographically approved
Zhao, W., Zhao, Y., Karlsson, M., Wang, Q. & Toprak, M. S. (2015). Evaluation of Zinc Oxide Nano-Microtetrapods for Biomolecule. In: Benjamin J. Eggleton, Stefano Palomba (Ed.), Micro+Nano Materials, Devices, and Systems: . Paper presented at SPIE Micro+Nano Materials, Devices, and Applications, December 6-9, 2015, Sydney, Australia. , 9668, Article ID 966833.
Open this publication in new window or tab >>Evaluation of Zinc Oxide Nano-Microtetrapods for Biomolecule
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2015 (English)In: Micro+Nano Materials, Devices, and Systems / [ed] Benjamin J. Eggleton, Stefano Palomba, 2015, Vol. 9668, article id 966833Conference paper, Published paper (Refereed)
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.

Series
Proceedings of SPIE, ISSN 0277-786X, E-ISSN 1996-756X ; 9668
Keywords
glucose, glucose oxidase, nafion, nano-microstructure, sensor, zinc oxide tetrapods
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:ri:diva-25388 (URN)10.1117/12.2202529 (DOI)2-s2.0-84959906456 (Scopus ID)9781628418903 (ISBN)
Conference
SPIE Micro+Nano Materials, Devices, and Applications, December 6-9, 2015, Sydney, Australia
Available from: 2018-04-11 Created: 2016-10-31 Last updated: 2023-04-05Bibliographically approved
Karlsson, M., Wang, Q., Zhao, Y., Zhao, W., Toprak, M. S., Iakimov, T., . . . Ivanov, I. G. (2015). Wafer-scale epitaxial graphene on SiC for sensing applications. In: Wafer-scale epitaxial graphene on SiC for sensing applications: . Paper presented at SPIE Micro+Nano Materials, Devices, and Applications, December 6-9. 2015, Sydney, Australia. , 9668, Article ID 96685T.
Open this publication in new window or tab >>Wafer-scale epitaxial graphene on SiC for sensing applications
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2015 (English)In: Wafer-scale epitaxial graphene on SiC for sensing applications, 2015, Vol. 9668, article id 96685TConference paper, Published paper (Refereed)
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.

Series
Proceedings of SPIE, ISSN 0277-786X, E-ISSN 1996-756X ; 9668
Keywords
Graphene, sensors, SiC, wafer-scale
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:ri:diva-25387 (URN)10.1117/12.2202440 (DOI)2-s2.0-84959878067 (Scopus ID)9781628418903 (ISBN)
Conference
SPIE Micro+Nano Materials, Devices, and Applications, December 6-9. 2015, Sydney, Australia
Available from: 2018-04-11 Created: 2016-10-31 Last updated: 2023-04-05Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-8626-0975

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