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Percolation-Regime Modulation of Charge Transport and Humidity-Driven Conductivity in 3 wt.% Graphene Oxide/Carboxymethyl Cellulose Membranes.

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Title: Percolation-Regime Modulation of Charge Transport and Humidity-Driven Conductivity in 3 wt.% Graphene Oxide/Carboxymethyl Cellulose Membranes.
Authors: Kuanyshbekov, Tilek1,2 (AUTHOR), Dautov, Adilet1,2 (AUTHOR), Orazova, San1,3 (AUTHOR), Abdala, Ahmed3,4 (AUTHOR), Tolepov, Zhandos4,5 (AUTHOR), Umarov, Amantur2,5,6 (AUTHOR), Aubakirova, Roza1 (AUTHOR), Tantibaeva, Batima1,2 (AUTHOR), Mukazhanova, Zhazira1,3 (AUTHOR), Abikak, Yerkezhan4,6 (AUTHOR), Shaikhova, Bakhyt1,5 (AUTHOR)
Source: Nanomaterials (2079-4991). Jun2026, Vol. 16 Issue 12, p750. 29p.
Subjects: Graphene oxide, Carboxymethylcellulose, Composite membranes (Chemistry), Polymeric composites, Electrical resistivity, Electric conductivity, Mechanical behavior of materials, Electron transport
Abstract: This study investigates graphene oxide/carboxymethyl cellulose composite membranes containing 3 wt.% graphene oxide. The influence of the carboxymethyl cellulose content on the structural organization, mechanical properties, electrical resistivity, and humidity-dependent conductivity was systematically analyzed using Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray diffraction, tensile testing, and electrical measurements. Fourier transform infrared spectroscopy indicated intermolecular interactions between graphene oxide and carboxymethyl cellulose functional groups. X-ray diffraction analysis showed gradual inter-layer expansion from 0.71 to 0.87 nm together with crystallite size reduction after polymer incorporation. Scanning electron microscopy observations demonstrated the increasing structural uniformity and polymer encapsulation of graphene oxide sheets with the increasing carboxymethyl cellulose content. Mechanical testing revealed improvement in the tensile strength from 6.6 to 17.8 MPa with the increasing carboxymethyl cellulose concentration. Simultaneously, the dry-state electrical resistivity increased from 5.8 × 106 to 2.32 × 107 Ω·m due to increasing dielectric separation between graphene oxide domains. Humidity-sensing experiments demonstrated reversible resistance changes in the 20–90% relative humidity range, associated with proton-assisted conduction through adsorbed water layers. The obtained results demonstrate that polymer incorporation strongly influences both the structural organization and electrophysical behavior of graphene oxide/carboxymethyl cellulose composite membranes. [ABSTRACT FROM AUTHOR]
Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Percolation-Regime Modulation of Charge Transport and Humidity-Driven Conductivity in 3 wt.% Graphene Oxide/Carboxymethyl Cellulose Membranes.
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  Data: <searchLink fieldCode="AR" term="%22Kuanyshbekov%2C+Tilek%22">Kuanyshbekov, Tilek</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Dautov%2C+Adilet%22">Dautov, Adilet</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Orazova%2C+San%22">Orazova, San</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Abdala%2C+Ahmed%22">Abdala, Ahmed</searchLink><relatesTo>3,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tolepov%2C+Zhandos%22">Tolepov, Zhandos</searchLink><relatesTo>4,5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Umarov%2C+Amantur%22">Umarov, Amantur</searchLink><relatesTo>2,5,6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Aubakirova%2C+Roza%22">Aubakirova, Roza</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tantibaeva%2C+Batima%22">Tantibaeva, Batima</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Mukazhanova%2C+Zhazira%22">Mukazhanova, Zhazira</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Abikak%2C+Yerkezhan%22">Abikak, Yerkezhan</searchLink><relatesTo>4,6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Shaikhova%2C+Bakhyt%22">Shaikhova, Bakhyt</searchLink><relatesTo>1,5</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="DE" term="%22Graphene+oxide%22">Graphene oxide</searchLink><br /><searchLink fieldCode="DE" term="%22Carboxymethylcellulose%22">Carboxymethylcellulose</searchLink><br /><searchLink fieldCode="DE" term="%22Composite+membranes+%28Chemistry%29%22">Composite membranes (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Polymeric+composites%22">Polymeric composites</searchLink><br /><searchLink fieldCode="DE" term="%22Electrical+resistivity%22">Electrical resistivity</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+conductivity%22">Electric conductivity</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+behavior+of+materials%22">Mechanical behavior of materials</searchLink><br /><searchLink fieldCode="DE" term="%22Electron+transport%22">Electron transport</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: This study investigates graphene oxide/carboxymethyl cellulose composite membranes containing 3 wt.% graphene oxide. The influence of the carboxymethyl cellulose content on the structural organization, mechanical properties, electrical resistivity, and humidity-dependent conductivity was systematically analyzed using Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray diffraction, tensile testing, and electrical measurements. Fourier transform infrared spectroscopy indicated intermolecular interactions between graphene oxide and carboxymethyl cellulose functional groups. X-ray diffraction analysis showed gradual inter-layer expansion from 0.71 to 0.87 nm together with crystallite size reduction after polymer incorporation. Scanning electron microscopy observations demonstrated the increasing structural uniformity and polymer encapsulation of graphene oxide sheets with the increasing carboxymethyl cellulose content. Mechanical testing revealed improvement in the tensile strength from 6.6 to 17.8 MPa with the increasing carboxymethyl cellulose concentration. Simultaneously, the dry-state electrical resistivity increased from 5.8 × 106 to 2.32 × 107 Ω·m due to increasing dielectric separation between graphene oxide domains. Humidity-sensing experiments demonstrated reversible resistance changes in the 20–90% relative humidity range, associated with proton-assisted conduction through adsorbed water layers. The obtained results demonstrate that polymer incorporation strongly influences both the structural organization and electrophysical behavior of graphene oxide/carboxymethyl cellulose composite membranes. [ABSTRACT FROM AUTHOR]
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  Label:
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  Data: <i>Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.3390/nano16120750
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      – Code: eng
        Text: English
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        PageCount: 29
        StartPage: 750
    Subjects:
      – SubjectFull: Graphene oxide
        Type: general
      – SubjectFull: Carboxymethylcellulose
        Type: general
      – SubjectFull: Composite membranes (Chemistry)
        Type: general
      – SubjectFull: Polymeric composites
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      – SubjectFull: Electrical resistivity
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      – SubjectFull: Electric conductivity
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      – SubjectFull: Mechanical behavior of materials
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      – SubjectFull: Electron transport
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      – TitleFull: Percolation-Regime Modulation of Charge Transport and Humidity-Driven Conductivity in 3 wt.% Graphene Oxide/Carboxymethyl Cellulose Membranes.
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              Text: Jun2026
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