Effect of humidity on the conductivity of graphite oxide during its photoreduction

Смирнов, В. А.; Денисов, Н. Н.; Ukshe, A. E.; Shul’ga, Yu. M.

doi:10.1134/s0018143913050135

Cited by 13 publications

(12 citation statements)

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“…This appears to be related to the dewatering of GO films due to absorption of water molecules by a concentrated acid form vapors. And as we have previously shown [13], the conductivity of GO films varies from 10 -6 to 10 -2 S/cm upon the relative humidity change from 30 to 100 %.…”

Section: Resultsmentioning

confidence: 62%

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A comparative analysis of graphene oxide films as proton conductors

et al. 2014

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The electrical conductivity of graphene oxide (GO) films in vapors of water and acid solutions is found to be close to the conductivity of a film formed after drying the solution of phenol-2,4-disulfonic acid in polyvinyl alcohol, which is known to be a proton conductor. We found that the conductivity of a GO film in vapors of the H 2 O-H 2 SO 4 electrolyte possesses a sharp maximum at *1 % by weight of sulfuric acid. The highest conductivity of GO films can be expected when placing the films over acid vapors where the acid concentration is essentially lower than in the acid solutions at their maximum conductivity. Since the conductivity of the H 2 O-H 2 SO 4 electrolyte itself has a maximum at *30 % by weight of sulfuric acid, the use of intermediate concentrations of H 2 SO 4 is recommended in practical applications. The GO films permeated with water or acid solution in water are expected to possess the proton-exchange properties similar to those of other proton-exchanging membranes.

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Section: Resultsmentioning

confidence: 62%

“…A recent study [12] reported on the use of ozonated GO films as efficient protonexchange membranes in fuel cells. The conductivity of GO films was studied [11,13,14] as a function of humidity and solvent type, and it was concluded that GO films are proton conductors.…”

Section: Introductionmentioning

confidence: 99%

A comparative analysis of graphene oxide films as proton conductors

et al. 2014

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“…Several phenomena affecting the electrical properties of the films were disclosed in our previous studies [27,28] on the photoconductivity of GO films in water vapor. At the initial stages of exposure to water vapor, the current was found to grow due to the presence of free water in the film.…”

Section: Introductionmentioning

confidence: 95%

“…In the work [13,27,28] the proton conductivity of multilayer films of GO was studied and it was noted [27,33] that photoreduction of GO leads to the onset of electronic conductivity accompanied by concomitant decay of protonic conductivity. Materials with mixed conductivity type are used in various devices, as discussed in the review articles [34][35][36].…”

Section: Introductionmentioning

confidence: 99%

“…In wet conditions the proton conductivity can be expected to grow while the electronic one, to decrease due to insulation of particles with electronic conductivity. In contrast to composites, GO is a homogeneous material but in OG films exhibiting proton conductivity in wet conditions [13,27,28] it seems feasible to induce electronic conductivity under the action of external influences, such as thermal treatment, chemical processing, and UV irradiation.…”

Section: Introductionmentioning

confidence: 99%

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A Review on the Conductive Properties of Graphene Oxide Films

2019

International Journal of Advanced Research in Chemical Science

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The behavior of interlayer water was studied in detail for graphite oxide [24-26]. By using neutron scattering, it has been shown [24] that, in the interlayer space, water may exist at high humidity in two forms: translational motion capable form and translational motion incapable one. The interlayer distance in graphite oxide was found [25] to abruptly change in the vicinity of freezing point. Talyzin et al. [25] have also established the presence of two types of water in the interlayer space of graphite oxide. The same conclusion was also reached by Zhu et al. [26] who investigated the thermal expansion of graphene layers and explained the negative thermal effect by reversible diffusion of free Abstract: Current-voltage characteristics of graphene oxide (GO) films were explored in water vapor as a function of water content in the film. The films can contain free and bound water. A decrease in current with time at a constant voltage is associated with the decrease in water content. Reduced GO (rGO) films exhibited proton and electron conductivity. For the proton conductivity E a = 0.9 eV, for the electron conductivity induced by thermolysis and chemical exposure E a = 1.15 eV. The rGO films is an example of mixed electron-proton conductivity when material conductivity can be regulated by external conditions. The field effect in a graphene oxide transistor for different conductivity types has been discovered and investigated. The possibility of accumulation and storage of electric charge in Nafion and GO films was demonstrated for the first time. The storage is governed by humidity of ambient environment. Charge accumulation occurs directly in Nafion or GO films.

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Gas Nanosensors

Mistewicz

2023

Low-Dimensional Chalcohalide Nanomaterials

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Effect of humidity on the conductivity of graphite oxide during its photoreduction

Cited by 13 publications

References 20 publications

A comparative analysis of graphene oxide films as proton conductors

A comparative analysis of graphene oxide films as proton conductors

A Review on the Conductive Properties of Graphene Oxide Films

Gas Nanosensors

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