Volatile Organic Compound Sensors Based on 2D Materials

Tan, Wee Chong; Ang, Kah‐Wee

doi:10.1002/aelm.202001071

Cited by 24 publications

(23 citation statements)

References 51 publications

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“…The emergence of 2D materials, starting from graphene and followed up to its elemental counterparts, such as borophene and phosphorene, [1][2][3] has substantially advanced the development of the next-generation sensing systems, [4,5] particularly gas sensing devices. [6,7] Given the 2D nature, the electronic structure in 2D materials is highly sensitive toward the appearance of adsorbates, offering exceptional gas detection performance even at room temperature with low intrinsic electrical noise. [2,8,9] Combined with the high surface-to-volume ratio and adjustability of the electronic structure via engineering of materials' morphology and chemistry, [10] these advantageous features have promoted the appearance of a diverse set of miniaturized high-performance gas sensors based on 2D materials, [6,[11][12][13] especially graphene and graphene oxide (GO) as the most prominent representatives.…”

Section: Introductionmentioning

confidence: 99%

Guiding Graphene Derivatization for the On‐Chip Multisensor Arrays: From the Synthesis to the Theoretical Background

Rabchinskii

Sysoev

Glukhova

et al. 2022

Adv Materials Technologies

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Engineering the physics and chemistry of 2D materials is a key to unlock the potential of the advanced e‐nose technologies limited by the current semiconductor technologies. Herein, the adjustment of the graphene's morphology, physics, and gas sensing properties upon its carboxylation via the developed photochemical method is demonstrated. Formation of matrices of nanoscale holes yet with the retention of the lamellar structure of the graphene layer is signified upon the introduction of up to 9.5 at% of carboxyl groups. The impact of the applied carboxylation on the conduction mechanism and electronic structure is demonstrated. The appearance of a set of the localized states in the valence band is revealed, originating from the molecular orbitals of carboxyls as is signified by the proposed approach for the identification of electronic states in graphene chemical derivatives. Given holey structure, predominance of highly affine carboxyls, and lateral inhomogeneity, the enhanced detection and discrimination of various alcohols, acetone, and ammonia vapors at room temperature is demonstrated. The opposite chemiresistive response toward ammonia in the humid air is also experimentally revealed and justified by the performed density functional theory modeling on the effect of ammonia, water, and their mix on electronic structure, and resistivity of the carboxylated graphene.

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Section: Introductionmentioning

confidence: 99%

Guiding Graphene Derivatization for the On‐Chip Multisensor Arrays: From the Synthesis to the Theoretical Background

Rabchinskii

Sysoev

Glukhova

et al. 2022

Adv Materials Technologies

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“…[ 7–9 ] As a result, a large family of Moiré materials and derivatives of 2D materials with the engineered electronic structure has emerged and found its application in the next‐generation photonics, optoelectronics, and sensing devices as well as the development of smart materials. [ 10–12 ]…”

Section: Introductionmentioning

confidence: 99%

Valence Band Structure Engineering in Graphene Derivatives

Shnitov

Rabchinskii

Brzhezinskaya

et al. 2021

Small

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Engineering of the 2D materials’ electronic structure is at the forefront of nanomaterials research nowadays, giving an advance in the development of next‐generation photonic devices, e‐sensing technologies, and smart materials. Herein, employing core‐level spectroscopy methods combined with density functional theory (DFT) modeling, the modification of the graphenes’ valence band (VB) upon its derivatization by carboxyls and ketones is revealed. The appearance of a set of localized states in the VB of graphene related to molecular orbitals of the introduced functionalities is signified both experimentally and theoretically. Applying the DFT calculations of the density of states projected on the functional groups, their contributions to the VB structure are decomposed. An empirical approach, allowing one to analyze and predict the impact of a certain functional group on the graphenes’ electronic structure in terms of examination of the model molecules, mimicking the introduced functionality, is proposed and validated. The interpretation of the arising states origin is made and their designation, pointing out their symmetry type, is proposed. Taken together, these results guide the band structure engineering of graphene derivatives and give a hint on the mechanisms underlying the alteration of the VB structure of 2D materials upon their derivatization.

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“…Electrochemical sensors use redox reactions to reduce or oxidize VOC molecules following their diffusion to the working electrode interface in an electrochemical cell containing a solid, liquid, or gaseous electrolyte or ionic conductor . The sensing mechanism depends on the electrochemical reaction at the electrodes, which leads to charge transfer and current flow correlating with VOC concentration. , Electrochemical sensors can operate either as amperometry-based, where the redox current is measured, or potentiometry-based, where the difference in potentials is measured . Cyclic voltammetry can also be performed with electrochemical sensors.…”

Section: Sensing Strategies: Transduction Mechanisms and Sensor Class...mentioning

confidence: 99%

“…Agri-tech is a growing technology segment in which the IoT is expected to show strong involvement, with the aim of optimizing the global food and agriculture industry . In particular, greenhouse cultivation, which has progressed from simple covered rows of open-fields crops to more sophisticated controlled-environment agricultural facilities, will benefit greatly from IoT systems.…”

Section: Representative Applications Of Voc Sensorsmentioning

confidence: 99%

Sensors for Volatile Organic Compounds

2022

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This paper provides an overview of recent developments in the field of volatile organic compound (VOC) sensors, which are finding uses in healthcare, safety, environmental monitoring, food and agriculture, oil industry, and other fields. It starts by briefly explaining the basics of VOC sensing and reviewing the currently available and quickly progressing VOC sensing approaches. It then discusses the main trends in materials’ design with special attention to nanostructuring and nanohybridization. Emerging sensing materials and strategies are highlighted and their involvement in the different types of sensing technologies is discussed, including optical, electrical, and gravimetric sensors. The review also provides detailed discussions about the main limitations of the field and offers potential solutions. The status of the field and suggestions of promising directions for future development are summarized.

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Volatile Organic Compound Sensors Based on 2D Materials

Cited by 24 publications

References 51 publications

Guiding Graphene Derivatization for the On‐Chip Multisensor Arrays: From the Synthesis to the Theoretical Background

Guiding Graphene Derivatization for the On‐Chip Multisensor Arrays: From the Synthesis to the Theoretical Background

Valence Band Structure Engineering in Graphene Derivatives

Sensors for Volatile Organic Compounds

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