Control of electrical properties of Ti3C2Tx mediated by facile alkalization

Bae, Young Hwan; Park, Sungho; Noh, Jin−Seo

doi:10.1016/j.surfin.2023.103258

Cited by 3 publications

(4 citation statements)

References 32 publications

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“…With the increase in the NaOH solution' concentration, both the number of incorporated Na + metal ions and the replacement of surface terminations with -OH functional groups increase, which is clearly observed in the increasing interlayer spacing. This result is in agreement with the previous literature[30,[34][35][36]. The increase in the interlayer spacing may be one of the major reasons causing the MXenes' enhanced gas-sensing performance.…”

supporting

confidence: 93%

“…The stability in sensor response is owed to the stable microstructure of the alkalized Ti 3 C 2 T x MXene. Secondly, the -F surface functional terminations of Ti 3 C 2 T x MXene are replaced by -OH and -O functional groups after NaOH alkalization, leading to a higher ratio of oxygen to fluorine atoms of the surface terminals [30,34,51]. The transformation of -F to -OH and -O are demonstrated by the XPS spectra and EDS mapping presented in Figures 6 and 7.…”

Section: Resultsmentioning

confidence: 94%

“…Remarkably, a Ti-OH peak appears at 532.8 eV for the alkalized Ti 3 C 2 T x MXene, which is not present in the pristine Ti 3 C 2 T x MXene, showing the successful alkalization of the MXene. [30,53,54]. The high-resolution XPS spectra of C 1s and Ti 2p of Ti 3 C 2 T x and Ti 3 C 2 T x alkalized with 5 M NaOH for 12 h are displayed in Figure 6c,d,g,h, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Liang et al reported that mesoporous γ-Fe 2 O 3 nanospheres @Ti 3 C 2 T x MXene treated with LiOH showed enhanced lithium storage capabilities [29]. Bae et al reported that the electrical properties of Ti 3 C 2 T x MXene could be modified by NaOH alkalization, leading to a transition from -F terminations to -OH/-O terminations [30]. Yang et al reported that layered Ti 3 C 2 T x MXene treated with NaOH showed enhanced gas and humidity sensitivity performance owing to the increasing ratio of oxygen to fluorine functional terminal groups [31].…”

Section: Introductionmentioning

confidence: 99%

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Sensitivity-Enhanced, Room-Temperature Detection of NH3 with Alkalized Ti3C2Tx MXene

Tan,

Xu,

et al. 2024

Nanomaterials

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A layered Ti3C2Tx MXene structure was prepared by etching MAX-phase Ti3AlC2 with hydro-fluoric acid (HF), followed by alkalization in sodium hydroxide (NaOH) solutions of varying concentrations and for varying durations. Compared to sensors utilizing unalkalized Ti3C2Tx, those employing alkalized Ti3C2Tx MXene exhibited enhanced sensitivity for NH3 detection at room temperature and a relative humidity of 40%. Both the concentration of NaOH and duration of alkalization significantly influenced sensor performance. Among the tested conditions, Ti3C2Tx MXene alkalized with a 5 M NaOH solution for 12 h exhibited optimal performance, with high response values of 100.3% and a rapid response/recovery time of 73 s and 38 s, respectively. The improved sensitivity of NH3 detection can be attributed to the heightened NH3 adsorption capability of oxygen-rich terminals obtained through the alkalization treatment. This is consistent with the observed increase in the ratio of oxygen to fluorine atoms on the surface terminations of the alkalization-treated Ti3C2Tx. These findings suggest that the gas-sensing characteristics of Ti3C2Tx MXene can be finely tuned and optimized through a carefully tailored alkalization process, offering a viable approach to realizing high-performance Ti3C2Tx MXene gas sensors, particularly for NH3 sensing applications.

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supporting

confidence: 93%

Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sensitivity-Enhanced, Room-Temperature Detection of NH3 with Alkalized Ti3C2Tx MXene

Tan,

Xu,

et al. 2024

Nanomaterials

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PMMA microspheres-embedded Ti3C2T MXene heterophotocatalysts synergistically working for multiple dye degradation

Vaishag,

Bae,

Noh

2024

Journal of Industrial and Engineering Chemistry

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A Comparative Review of Graphene and MXene-Based Composites towards Gas Sensing

Vaishag,

Noh

2024

Molecules

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Graphene and MXenes have emerged as promising materials for gas sensing applications due to their unique properties and superior performance. This review focuses on the fabrication techniques, applications, and sensing mechanisms of graphene and MXene-based composites in gas sensing. Gas sensors are crucial in various fields, including healthcare, environmental monitoring, and industrial safety, for detecting and monitoring gases such as hydrogen sulfide (H2S), nitrogen dioxide (NO2), and ammonia (NH3). Conventional metal oxides like tin oxide (SnO2) and zinc oxide (ZnO) have been widely used, but graphene and MXenes offer enhanced sensitivity, selectivity, and response times. Graphene-based sensors can detect low concentrations of gases like H2S and NH3, while functionalization can improve their gas-specific selectivity. MXenes, a new class of two-dimensional materials, exhibit high electrical conductivity and tunable surface chemistry, making them suitable for selective and sensitive detection of various gases, including VOCs and humidity. Other materials, such as metal-organic frameworks (MOFs) and conducting polymers, have also shown potential in gas sensing applications, which may be doped into graphene and MXene layers to improve the sensitivity of the sensors.

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Control of electrical properties of Ti3C2Tx mediated by facile alkalization

Cited by 3 publications

References 32 publications

Sensitivity-Enhanced, Room-Temperature Detection of NH3 with Alkalized Ti3C2Tx MXene

Sensitivity-Enhanced, Room-Temperature Detection of NH3 with Alkalized Ti3C2Tx MXene

PMMA microspheres-embedded Ti3C2T MXene heterophotocatalysts synergistically working for multiple dye degradation

A Comparative Review of Graphene and MXene-Based Composites towards Gas Sensing

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