Preparation of fluorinated graphene to study its gas sensitivity

Kang, Wenze; Li, Shangyi

doi:10.1039/c8ra03451f

Cited by 50 publications

(33 citation statements)

References 27 publications

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“…In addition, the weak peak at a binding energy of 291 eV is assigned to the C−F and/or Cl group. 62,63 In the F 1s region, the fitted peaks can be attributed to F−V, F x −Ti−C, and F−C bonds in both samples (Figure 7B and 8B). In the TiVCT x -HF sample the F−C bonds are centered at 686.5 eV and 688 eV, while in the TiVCT x -LiF/HCl sample they are located at binding energies of 688.5 eV and 693 eV.…”

Section: ■ Materials and Methodsmentioning

confidence: 93%

Synthesis and Surface Chemistry of 2D TiVC Solid-Solution MXenes

Yazdanparast

Soltanmohammad

Fash-White

et al. 2020

ACS Appl. Mater. Interfaces

107

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MXenes are emerging two-dimensional (2D) materials for energy-storage applications and supercapacitors. Their surface chemistry, which determines critical properties, varies due to different synthesis conditions. In this work, we synthesized TiVC solid-solution MXenes by two different synthesis methods and investigated their surface functional groups. We performed etching of the TiVAlC MAX phase using two different solutions, a highly concentrated HF (50 wt % ≈ 29 M) and a mixture of LiF and HCl (1.9 M LiF/12 M HCl). Large-scale delamination of TiVCT x to produce single-flake suspension was achieved by further intercalation of the resultant MXene from LiF/HCl with tetrabutylammonium hydroxide (TBAOH). X-ray diffraction indicates a large interlayer spacing of 2.18 nm for TiVCT x MXene flakes. To investigate the structural stability and adsorption energy of different functional groups on TiVC MXenes, density functional theory (DFT) calculations were performed and supported with X-ray photoelectron spectroscopy (XPS) measurements. A higher concentration of O and a lower concentration of −F were achieved on the TiVC synthesized by LiF/HCl, both of which provide a more favorable surface chemistry for energy-storage applications. Our results provide the first systematic study on the effect of synthesis conditions on the surface chemistry of solid-solution TiVC MXenes.

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Section: ■ Materials and Methodsmentioning

confidence: 93%

Synthesis and Surface Chemistry of 2D TiVC Solid-Solution MXenes

Yazdanparast

Soltanmohammad

Fash-White

et al. 2020

ACS Appl. Mater. Interfaces

107

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“…As a result, FG is regarded as a potential candidate in gas detection, storage, and separation. [98,[207][208][209][210][211][212] Liu et al displayed that FG showed a distinct color variation from white to dark yellow under the atmosphere of ammonia, which could be observed with naked eyes directly. The corresponding sensitivity reached a high value of 4.05% by PL measurement.…”

Section: Gas Detection Storage and Separationmentioning

confidence: 99%

Recent Advances in Fluorinated Graphene from Synthesis to Applications: Critical Review on Functional Chemistry and Structure Engineering

et al. 2021

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“…Secondly, fluorinated graphene (FG) exhibits higher adsorption energies [147], higher sensitivity and better adsorption [148] of NH3 than the untreated one. FGs have also been reported to detect a wide variety of molecules other than NH3 [32], such as formaldehyde [149], dopamine [150], heavy metal ions [151] or humidity [152].…”

Section: Gas Sensingmentioning

confidence: 99%