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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.
Öppna denna publikation i ny flik eller fönster >>Surfactant-free starch-graphene composite films as simultaneous oxygen and water vapour barriers
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2022 (Engelska)Ingår i: npj 2D Materials and Applications, ISSN 2397-7132, Vol. 6, nr 1, artikel-id 20Artikel i tidskrift (Refereegranskat) 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).

Ort, förlag, år, upplaga, sidor
Nature Research, 2022
Nyckelord
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
Nationell ämneskategori
Polymerteknologi
Identifikatorer
urn:nbn:se:ri:diva-59006 (URN)10.1038/s41699-022-00292-x (DOI)2-s2.0-85126771096 (Scopus ID)
Anmärkning

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.

Tillgänglig från: 2022-04-21 Skapad: 2022-04-21 Senast uppdaterad: 2023-05-09Bibliografiskt granskad
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.
Öppna denna publikation i ny flik eller fönster >>Highly Conductive Films by Rapid Photonic Annealing of Inkjet Printable Starch–Graphene Ink
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2021 (Engelska)Ingår i: Advanced Materials Interfaces, ISSN 2196-7350, Vol. 9, nr 5, artikel-id 2101884Artikel i tidskrift (Refereegranskat) 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. 

Ort, förlag, år, upplaga, sidor
John Wiley and Sons Inc, 2021
Nyckelord
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
Nationell ämneskategori
Materialkemi
Identifikatorer
urn:nbn:se:ri:diva-58169 (URN)10.1002/admi.202101884 (DOI)2-s2.0-85122063587 (Scopus ID)
Anmärkning

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.

Tillgänglig från: 2022-01-14 Skapad: 2022-01-14 Senast uppdaterad: 2024-03-03Bibliografiskt granskad
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
Öppna denna publikation i ny flik eller fönster >>Surfactant-Free Stabilization of Aqueous Graphene Dispersions Using Starch as a Dispersing Agent
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2021 (Engelska)Ingår i: ACS Omega, E-ISSN 2470-1343, Vol. 6, nr 18, s. 12050-12062Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
American Chemical Society, 2021
Nationell ämneskategori
Fysikalisk kemi
Identifikatorer
urn:nbn:se:ri:diva-53478 (URN)10.1021/acsomega.1c00699 (DOI)2-s2.0-85106450176 (Scopus ID)
Anmärkning

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.

Tillgänglig från: 2021-06-17 Skapad: 2021-06-17 Senast uppdaterad: 2023-05-26Bibliografiskt granskad
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
Öppna denna publikation i ny flik eller fönster >>Graphene and Flavin Mononucleotide Interaction in Aqueous Graphene Dispersions
2019 (Engelska)Ingår i: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 123, nr 43, s. 26282-26288Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
American Chemical Society, 2019
Nyckelord
flavin mononucleotide interaction graphene aqueous dispersion
Nationell ämneskategori
Naturvetenskap
Identifikatorer
urn:nbn:se:ri:diva-40649 (URN)10.1021/acs.jpcc.9b06442 (DOI)2-s2.0-85074434371 (Scopus ID)
Tillgänglig från: 2019-11-08 Skapad: 2019-11-08 Senast uppdaterad: 2023-05-09Bibliografiskt granskad
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
Öppna denna publikation i ny flik eller fönster >>Hybrid Materials of Nanocellulose and Graphene
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2019 (Engelska)Ingår i: International Conference on Nanotechnology for Renewable Materials 2019, TAPPI Press , 2019, Vol. 2, s. 1069-1080Konferensbidrag, Publicerat paper (Refereegranskat)
Ort, förlag, år, upplaga, sidor
TAPPI Press, 2019
Nationell ämneskategori
Materialteknik
Identifikatorer
urn:nbn:se:ri:diva-68229 (URN)2-s2.0-85073798897 (Scopus ID)
Konferens
International Conference on Nanotechnology for Renewable Materials 2019. Chiba. 3 June 2019 through 7 June 2019
Tillgänglig från: 2023-12-06 Skapad: 2023-12-06 Senast uppdaterad: 2023-12-06Bibliografiskt granskad
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.
Öppna denna publikation i ny flik eller fönster >>Evaluation of Zinc Oxide Nano-Microtetrapods for Biomolecule
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2015 (Engelska)Ingår i: Micro+Nano Materials, Devices, and Systems / [ed] Benjamin J. Eggleton, Stefano Palomba, 2015, Vol. 9668, artikel-id 966833Konferensbidrag, Publicerat paper (Refereegranskat)
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.

Serie
Proceedings of SPIE, ISSN 0277-786X, E-ISSN 1996-756X ; 9668
Nyckelord
glucose, glucose oxidase, nafion, nano-microstructure, sensor, zinc oxide tetrapods
Nationell ämneskategori
Elektroteknik och elektronik
Identifikatorer
urn:nbn:se:ri:diva-25388 (URN)10.1117/12.2202529 (DOI)2-s2.0-84959906456 (Scopus ID)9781628418903 (ISBN)
Konferens
SPIE Micro+Nano Materials, Devices, and Applications, December 6-9, 2015, Sydney, Australia
Tillgänglig från: 2018-04-11 Skapad: 2016-10-31 Senast uppdaterad: 2023-04-05Bibliografiskt granskad
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.
Öppna denna publikation i ny flik eller fönster >>Wafer-scale epitaxial graphene on SiC for sensing applications
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2015 (Engelska)Ingår i: Wafer-scale epitaxial graphene on SiC for sensing applications, 2015, Vol. 9668, artikel-id 96685TKonferensbidrag, Publicerat paper (Refereegranskat)
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.

Serie
Proceedings of SPIE, ISSN 0277-786X, E-ISSN 1996-756X ; 9668
Nyckelord
Graphene, sensors, SiC, wafer-scale
Nationell ämneskategori
Elektroteknik och elektronik
Identifikatorer
urn:nbn:se:ri:diva-25387 (URN)10.1117/12.2202440 (DOI)2-s2.0-84959878067 (Scopus ID)9781628418903 (ISBN)
Konferens
SPIE Micro+Nano Materials, Devices, and Applications, December 6-9. 2015, Sydney, Australia
Tillgänglig från: 2018-04-11 Skapad: 2016-10-31 Senast uppdaterad: 2023-04-05Bibliografiskt granskad
Organisationer
Identifikatorer
ORCID-id: ORCID iD iconorcid.org/0000-0002-8626-0975

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