Plasma Processing and Treatment of 2D Transition Metal Dichalcogenides: Tuning Properties and Defect Engineering

Sovizi, Saeed; Angizi, Shayan; Ahmad Alem, Sayed Ali; Goodarzi, Reyhaneh; Taji Boyuk, Mohammad Reza Rahmani; Ghanbari, Hajar; Szoszkiewicz, Robert; Simchi, Abdolreza; Kruse, Peter

doi:10.1021/acs.chemrev.3c00147

Cited by 3 publications

(2 citation statements)

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Section: Surface Characterizationmentioning

confidence: 99%

“…UV-O3 treatment is known to make glass surfaces more hydrophilic by introducing hydroxyl (OH) groups that attract water molecules. The mild increase in hydrophobicity on the MoS2 surface can be attributed to the oxidation of the surface [37,38]. EFM is an electrical mode in AFM to map variations in the sample's electric field and reveal information about the surface potential and charge distribution.…”

Section: Surface Characterizationmentioning

confidence: 99%

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A Dual-Channel MoS2-Based Selective Gas Sensor for Volatile Organic Compounds

Kuş,

Altındemir,

Bostan

et al. 2024

Nanomaterials

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Significant progress has been made in two-dimensional material-based sensing devices over the past decade. Organic vapor sensors, particularly those using graphene and transition metal dichalcogenides as key components, have demonstrated excellent sensitivity. These sensors are highly active because all the atoms in the ultra-thin layers are exposed to volatile compounds. However, their selectivity needs improvement. We propose a novel gas-sensing device that addresses this challenge. It consists of two side-by-side sensors fabricated from the same active material, few-layer molybdenum disulfide (MoS₂), for detecting volatile organic compounds like alcohol, acetone, and toluene. To create a dual-channel sensor, we introduce a simple step into the conventional 2D material sensor fabrication process. This step involves treating one-half of the few-layer MoS₂ using ultraviolet–ozone (UV-O3) treatment. The responses of pristine few-layer MoS₂ sensors to 3000 ppm of ethanol, acetone, and toluene gases are 18%, 3.5%, and 49%, respectively. The UV-O3-treated few-layer MoS₂-based sensors show responses of 13.4%, 3.1%, and 6.7%, respectively. This dual-channel sensing device demonstrates a 7-fold improvement in selectivity for toluene gas against ethanol and acetone. Our work sheds light on understanding surface processes and interaction mechanisms at the interface between transition metal dichalcogenides and volatile organic compounds, leading to enhanced sensitivity and selectivity.

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Section: Surface Characterizationmentioning

confidence: 99%

Section: Surface Characterizationmentioning

confidence: 99%

A Dual-Channel MoS2-Based Selective Gas Sensor for Volatile Organic Compounds

Kuş,

Altındemir,

Bostan

et al. 2024

Nanomaterials

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Stability of Vanadium‐Doped Transition Metal Dichalcogenides under Etching Atmosphere

Zhao,

Xiao,

Feng

et al. 2024

Physica Rapid Research Ltrs

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Two‐dimensional (2D) transition metal dichalcogenides (TMDs) have attracted intensive interests for its unique electronic, optical, and thermal properties. Doping is necessary to expand the application. However, the stability of doped materials has been overlooked. This study focuses on the stability of monolayer‐doped MoS2 with different vanadium (V) concentrations. It provides a quantitative assessment of the etching results. Findings indicate that the stability of MoS2 under different etching atmospheres follows the series of lightly doped MoS2 (LD), pristine MoS2 (PR), moderately doped MoS2 (MD), and highly doped MoS2 (HD). Our research indicates that the stability of the material is linked to the bonding energy of cations and anions, as well as the amount of lattice distortion, which competes with one another. Low levels of V doping do not lead to significant lattice distortion, and the binding energy between sulfur (S) and V surpasses that of molybdenum (Mo), which is the primary factor. Excessive doping results in lattice distortion, which leads to a multitude of defects and a reduction in durability. This work is important for guiding the assessment of the reliability, the protection of degradation, and application scenarios of TMDs.This article is protected by copyright. All rights reserved.

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