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Alcohol Sensing Behavior and Impedance Spectroscopy Characterization of g-C 3 N 4 Nanosheets.

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Title: Alcohol Sensing Behavior and Impedance Spectroscopy Characterization of g-C 3 N 4 Nanosheets.
Authors: Bui, Cong Doan1 (AUTHOR) congdoan6997@mail.ru, Nalimova, Svetlana1,2 (AUTHOR), Kondratev, Valery2,3 (AUTHOR), Shomakhov, Zamir4,5 (AUTHOR), Kirillova, Svetlana5,6 (AUTHOR), Maximov, Alexander1,6 (AUTHOR), Moshnikov, Vyacheslav1 (AUTHOR)
Source: Nanomaterials (2079-4991). Feb2026, Vol. 16 Issue 3, p213. 16p.
Subjects: Impedance spectroscopy, Two-dimensional materials (Nanotechnology), Nanostructured materials, Semiconductor materials, Materials testing, Electronic materials, Gas detectors
Abstract: Two-dimensional graphitic carbon nitride 2D g-C3N4 has the potential for gas sensing as a metal-free semiconductor with a layered structure, high surface area, and tunability of electronic properties. In this context, 2D g-C3N4 nanosheets were prepared by the thermal polycondensation of urea followed by ultrasonic exfoliation. X-ray diffraction revealed diffraction peaks corresponding to the (110) and (002) crystallographic planes of g-C3N4. Scanning electron microscopy showed a nanosheet structure with a 10-nm crystallite size, while energy-dispersive X-ray spectroscopy demonstrated a uniform distribution of carbon and nitrogen. Ultraviolet–visible absorption spectroscopy revealed a band gap of 2.8 eV. Gas sensing measurements exhibited an increase in response to isopropanol and ethanol as the operating temperature and gas concentration increased. Impedance spectroscopy provided additional insight into the sensing mechanism. Observed depressed semicircles in Nyquist plots were fitted with a charge transfer resistance Rct in parallel with a constant phase element model. The charge transfer resistance Rct fell systematically with isopropanol exposure, confirming the crucial role of adsorption-induced electron transfer in the gas sensing response. [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: Alcohol Sensing Behavior and Impedance Spectroscopy Characterization of g-C 3 N 4 Nanosheets.
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  Data: <searchLink fieldCode="AR" term="%22Bui%2C+Cong+Doan%22">Bui, Cong Doan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> congdoan6997@mail.ru</i><br /><searchLink fieldCode="AR" term="%22Nalimova%2C+Svetlana%22">Nalimova, Svetlana</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kondratev%2C+Valery%22">Kondratev, Valery</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Shomakhov%2C+Zamir%22">Shomakhov, Zamir</searchLink><relatesTo>4,5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kirillova%2C+Svetlana%22">Kirillova, Svetlana</searchLink><relatesTo>5,6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Maximov%2C+Alexander%22">Maximov, Alexander</searchLink><relatesTo>1,6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Moshnikov%2C+Vyacheslav%22">Moshnikov, Vyacheslav</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Nanomaterials+%282079-4991%29%22">Nanomaterials (2079-4991)</searchLink>. Feb2026, Vol. 16 Issue 3, p213. 16p.
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  Data: <searchLink fieldCode="DE" term="%22Impedance+spectroscopy%22">Impedance spectroscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Two-dimensional+materials+%28Nanotechnology%29%22">Two-dimensional materials (Nanotechnology)</searchLink><br /><searchLink fieldCode="DE" term="%22Nanostructured+materials%22">Nanostructured materials</searchLink><br /><searchLink fieldCode="DE" term="%22Semiconductor+materials%22">Semiconductor materials</searchLink><br /><searchLink fieldCode="DE" term="%22Materials+testing%22">Materials testing</searchLink><br /><searchLink fieldCode="DE" term="%22Electronic+materials%22">Electronic materials</searchLink><br /><searchLink fieldCode="DE" term="%22Gas+detectors%22">Gas detectors</searchLink>
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  Label: Abstract
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  Data: Two-dimensional graphitic carbon nitride 2D g-C3N4 has the potential for gas sensing as a metal-free semiconductor with a layered structure, high surface area, and tunability of electronic properties. In this context, 2D g-C3N4 nanosheets were prepared by the thermal polycondensation of urea followed by ultrasonic exfoliation. X-ray diffraction revealed diffraction peaks corresponding to the (110) and (002) crystallographic planes of g-C3N4. Scanning electron microscopy showed a nanosheet structure with a 10-nm crystallite size, while energy-dispersive X-ray spectroscopy demonstrated a uniform distribution of carbon and nitrogen. Ultraviolet–visible absorption spectroscopy revealed a band gap of 2.8 eV. Gas sensing measurements exhibited an increase in response to isopropanol and ethanol as the operating temperature and gas concentration increased. Impedance spectroscopy provided additional insight into the sensing mechanism. Observed depressed semicircles in Nyquist plots were fitted with a charge transfer resistance Rct in parallel with a constant phase element model. The charge transfer resistance Rct fell systematically with isopropanol exposure, confirming the crucial role of adsorption-induced electron transfer in the gas sensing response. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  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/nano16030213
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        Text: English
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      – SubjectFull: Impedance spectroscopy
        Type: general
      – SubjectFull: Two-dimensional materials (Nanotechnology)
        Type: general
      – SubjectFull: Nanostructured materials
        Type: general
      – SubjectFull: Semiconductor materials
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      – SubjectFull: Materials testing
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      – SubjectFull: Electronic materials
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      – SubjectFull: Gas detectors
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    Titles:
      – TitleFull: Alcohol Sensing Behavior and Impedance Spectroscopy Characterization of g-C 3 N 4 Nanosheets.
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            NameFull: Bui, Cong Doan
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            NameFull: Nalimova, Svetlana
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              M: 02
              Text: Feb2026
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              Y: 2026
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