Method for efficiently preparing thin-layer MXene
A thin-layer, high-efficiency technology, applied in chemical instruments and methods, nanotechnology for materials and surface science, inorganic chemistry, etc., can solve problems such as low yield of thin-layer MXene, achieve low cost, prevent oxidation, and improve The effect of the application foreground
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Embodiment 1
[0035] Add 2g of lithium fluoride into 40ml of 9M hydrochloric acid and mix well; then slowly add 2g of MAX into the resulting mixed solution, and stir at 35°C for 24 hours. Then centrifuge and wash to neutral to obtain the etched MAX raw material.
[0036] Weigh 1g of the etched MAX raw material and disperse it in 15ml of 0.6mg / ml carbon nanotube aqueous solution. After shaking and peeling for 1h, freeze-dry to obtain a thin-layer MXene two-dimensional nanomaterial. As a comparison, 1 g of the etched MAX raw material was weighed and dispersed in 15 ml of aqueous solution, shaken and stripped for 1 hour, and then freeze-dried to obtain MXene precipitates.
[0037] figure 1 It is an SEM photo based on the unstripped MXene precipitate (a) in Example 1 and the MXene (b, c, d) that is efficiently stripped by an aqueous solution of carbon nanotubes. As shown in the figure, the thin-layer MXene exfoliated by the carbon nanotube aqueous solution presents a loose two-dimensional nan...
Embodiment 2
[0039] Weigh 1g of the etched MAX raw material and disperse it in 20ml of 5mg / ml chitosan aqueous solution, shake it off for 1h, and then freeze-dry to obtain the MXene two-dimensional nanosheet material. As a comparison, 1 g of the etched MAX raw material was weighed and dispersed in 20 ml of aqueous solution, shaken and stripped for 1 hour, and then freeze-dried to obtain MXene precipitates.
[0040] image 3 It is based on the SEM photographs of thin-layer MXene two-dimensional nanosheets (a, b) and MXene precipitates (c, d) in Example 2. As shown in the figure, the thin-layer MXene exfoliated by chitosan aqueous solution presents a loose two-dimensional nano-sheet structure with ultra-thin sheets, and the sheet-like thickness of its single layer is about 10 nm. However, most of the MXene precipitates showed a thick block structure.
[0041] Figure 4 It is based on the X-ray diffraction (XRD) spectrum of thin-layer MXene two-dimensional nanosheets and MXene precipitates i...
Embodiment 3
[0043] Weigh 0.5g of the etched MAX raw material and disperse it in 5ml of a 5mg / ml polyacrylamide aqueous solution. After shaking and peeling for 1 hour, freeze-dry to obtain a thin-layer MXene two-dimensional nanomaterial. As a comparison, 0.5 g of the etched MAX raw material was weighed and dispersed in 5 ml of aqueous solution, shaken and stripped for 1 hour, and then freeze-dried to obtain MXene precipitates.
[0044] Figure 5 It is based on the SEM photos of the MXene precipitate (a) and the exfoliated thin layer MXene (b, c, d) in Example 3. As shown in the figure, the thin-layer MXene exfoliated by polyacrylamide (PAM) aqueous solution exhibits a loose two-dimensional nanosheet structure, and the sheet is ultra-thin, with a single-layer sheet thickness of about 10 nm. However, most of the MXene precipitates showed a thick block structure.
[0045] Figure 6 Be based on the X-ray diffraction (XRD) spectrogram of thin layer MXene two-dimensional nanosheet and MXene p...
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