Vanadium carbide is a black crystal with a density of approximately 5.25～5.4g/cm3 and a melting point of 2750℃, which is slightly harder than quartz. This substance is mainly used in the manufacture of vanadium steel and can be used as an additive for carbide cemented carbide.
Two-dimensional vanadium carbide nanosheets have great potential as photothermal reagents in the photothermal treatment of cancer. However, harsh synthesis conditions and low photothermal conversion efficiency limit the application of vanadium carbide in photothermal therapy. Recently, the research team reported a green preparation method, using algae extracts to prepare high-yield two-dimensional vanadium carbide nanosheets by intercalation.
In recent years, new two-dimensional transition metal carbonitride materials have been used in many fields such as energy storage, biosensors and biomedicine due to their superior metal conductivity, hydrophobicity, various components and nanostructures. Broad application prospects.
The two-dimensional transition metal carbonitride is prepared on the precursor of the layered Mn+1AXn structure. In this ternary precursor, "M" is the transition metal, and "A" mainly represents the IIIA group or the IVA group (13 Or 14) element, "X" is C or N (n = 1, 2 or 3). MAX composed of metal M-A bonds and M-X bonds has a layered hexagonal crystal structure, in which the A element is "bonded" between adjacent Mn+1Xn layers. Taking advantage of the feature that the M-A bond is weaker than the M-X, the A layer can usually be selectively etched with a strong corrosive acid or alkali to prepare a single layer of Mn+1Xn. However, these methods have harsh synthesis conditions, low yield, and damage the complete structure of the single-layer Mn+1Xn, which limits their large-scale application. Therefore, there is an urgent need to develop an efficient, environmentally friendly, and high-yield preparation method to further understand and broaden the application range of such materials.
The method proposed by the research team to use algae extracts to prepare high-yield two-dimensional vanadium carbide nanosheets by intercalation method solves the above problems. The vanadium carbide nanosheets prepared by this method have a complete structure and high absorption in the near-infrared region. The photothermal conversion efficiency at 808 nm is as high as 48%, which is better than other reported two-dimensional transition metal carbonitride Mo2C ( 42.9%), Nb2C (36.4% for NIR-I, 45.65% for NIR-II), and Ta4C3 (44.7%), even comparable to the photothermal conversion efficiency of gold-based materials and carbon-based nanomaterials. Applying it to the field of photothermal therapy of cancer, both in vivo and in vitro experiments show that two-dimensional vanadium carbide nanosheets can be used as potential photothermal agents for photothermal therapy guided by photoacoustic and magnetic resonance multi-mode imaging. This work avoids the harsh conditions of using strong corrosive acids or alkalis, provides an economical, environmentally friendly, and high-yield method for the preparation of two-dimensional transition metal carbonitrides, and provides a way for the development of two-dimensional transition metal carbonitrides with excellent performance.
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