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‎ 20.1001.1.17353351.1403.20.0.7.7

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Investigating the effect of the processing method on the structural and photoluminescent properties of the two-dimensional Ti3C2Tx material: Comparison of direct and in situ HF etching methods
Khashayar Beirami , Marjan Rajabi *
Iranian Research Organization for Science and Technology , mrajabi@irost.ir
Abstract:   (1664 Views)
In this article, the effect of two direct and in-situ HF etching on the chemical composition, structural properties and luminescence of Ti3C2Tx Mxene has been investigated and compared. The results of examining the microstructure of the samples with FE-SEM showed the accordion-like morphology with surface cracks of Ti3C2Tx synthesized by direct HF etching and the crinkle-like morphology with smooth, crack-free surface of Ti3C2Tx synthesized by In-situ HF etching. The results of XRD analysis showed more efficient removal of Al atoms from the primary Ti3AlC2 Max phase during the in-Situ HF etching and the increase of the d-spacing of the network structure due to the intercalation of Li+ ions between the Ti3C2Tx layers. EDX analysis also showed the successful removal of Al atoms in both methods and the creation of -F, -Cl and -O functional groups. The specific surface area was measured by BET analysis for Ti3C2Tx Mxene synthesized by direct and in situ HF etching methods, equal to 4.4489 (m2/g) and 3.6964 (m2/g), respectively. Although Ti3C2Tx Mxene is a metallic material and based on its electronic band structure, it does not have luminescent properties, but the investigation of luminescent properties at room temperature shows emissions at ~ 376, 430 and 590 nm wavelengths, which depend on the excitation energy. Investigating the luminescence spectra at room temperature under different excitation wavelengths of 275 and 375 nm showed the presence of defects caused by TiOx on the surfaces of MXenes synthesized by both methods.
 
Keywords: Ti3AlC2, Ti3C2Tx, Direct HF etching, In-Situ HF etching, photoluminescence
     
Type of Study: Research | Subject: Ceramics used in the Environment, Water and Energy
Received: 2024/10/19 | Accepted: 2025/01/16
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