Hole-matrixed carbonylated graphene: synthesis, properties, and highly-selective ammonia gas sensing

Abstract

the synthesis of holey carbonylated (C-ny) graphene derivative and its application for gas sensing is demonstrated. The carbonylation of graphene oxide leads to the three-fold increasing the concentration of carbonyl groups’ up to 9 at.% with substantial elimination of other oxygen functionalities. Such a chemical modification is accompanied by the perforation of the graphene network with the appearance of matrices of nanoscale holes, leading to corrugation of the layer and its sectioning into localized domains of the π-conjugated graphene network. Combined with the predominant presence of carbonyls, granting the specificity in gas molecules adsorption, these features result in the enhanced gas sensing properties of C-ny graphene at room temperature, especially exceptional selectivity. Opposite chemiresistive response towards ammonia in comparison to other analytes, such as ethanol, acetone, and CO2, is demonstrated for the C-ny graphene sensing layer both in humid and dry air background. Moreover, selective identification of all of the studied analytes has been further achieved by applying a fabricated multielectrode chip under the multisensory lab-on-a-chip paradigm, owing to the desired inhomogeneity of the C-ny graphene layer morphology. Comparing the experimental results with the calculations performed in the framework of density functional theory, we clarify the effect of partial charge transfer caused by water and ammonia adsorption on the chemiresistive response. This work constitutes a step forward in the graphene chemical derivatization and application of such materials in the field of gas sensing due to its low cost, low energy consumption, and enhanced sensing performance.

Speaker

Rabchinskii Maxim
Ioffe Institute
Russia

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