Theranostic 2D Tantalum Carbide (MXene)

Traditional ceramic materials are typically rigid and large in size, making them unsuitable for biomedical use, especially in the bloodstream. These materials are usually produced via high-temperature sintering and are not considered for cancer treatment. Despite their structural stability, they have not been explored for in vivo applications due to their inability to circulate within the body. However, recent advances in nanotechnology have opened new possibilities for using such materials in biomedical contexts. The challenge lies in transforming these rigid ceramics into functional nanoscale structures that can be safely used in the body. While some nanomaterials have been used for imaging and therapy, the potential of MAX-phase ceramics remains largely unexplored. This gap motivated researchers to investigate whether MAX-phase materials could be exfoliated into ultrathin nanosheets suitable for biomedical use. The need for a material that can serve both as an imaging agent and a therapeutic tool is significant in cancer treatment. This paper addresses the lack of research on the biomedical potential of MAX-phase ceramics and their derivatives.

This study aims to explore the biomedical potential of MAX-phase ceramics by exfoliating them into ultrathin nanosheets called MXenes. The primary goal is to determine whether these nanosheets can be used for dual-mode imaging and photothermal therapy. The researchers focus on tantalum carbide (Ta₄C₃) as a model system due to its promising properties. They seek to develop a method to synthesize biocompatible nanosheets that can circulate in the bloodstream and target tumors. The motivation stems from the need for a versatile material that can both image and destroy cancer cells. The study also aims to evaluate the photothermal conversion efficiency of these nanosheets. By modifying the nanosheets with soybean phospholipids, the researchers aim to enhance their biocompatibility and tumor-targeting ability. The ultimate goal is to establish a new paradigm for using MXenes in theranostic applications.

The researchers employed a two-step liquid exfoliation strategy to synthesize ultrathin Ta₄C₃ MXene nanosheets from MAX-phase Ta₄AlC₃. The first step involved etching the MAX phase with hydrofluoric acid (HF) to remove the aluminum layer. The second step used probe sonication to exfoliate the remaining material into nanosheets. Structural and electronic properties of the nanosheets were analyzed using various characterization techniques. First-principles calculations based on density functional theory were used to understand the electronic and surface characteristics of the nanosheets. The nanosheets were then modified with soybean phospholipids to improve biocompatibility. The photothermal conversion efficiency was measured using in vitro and in vivo experiments. Dual-mode imaging capabilities were tested using photoacoustic and computed tomography. The researchers evaluated the nanosheets' ability to target and ablate tumors in a biological system.

The Ta₄C₃ MXene nanosheets exhibited a high photothermal conversion efficiency of 44.7%. The nanosheets were successfully exfoliated into ultrathin structures with nanoscale lateral dimensions. Characterization confirmed the structural and electronic properties of the nanosheets. The soybean phospholipid modification significantly improved biocompatibility and tumor-targeting ability. In vitro experiments demonstrated effective photothermal ablation of cancer cells. In vivo studies showed that the nanosheets could accumulate in tumor sites and generate sufficient heat to destroy cancer cells. The nanosheets also showed strong performance in dual-mode imaging, combining photoacoustic and computed tomography. The results suggest that Ta₄C₃ MXene nanosheets can serve as a theranostic agent for cancer treatment.

The study demonstrates that MAX-phase ceramics can be exfoliated into ultrathin MXene nanosheets suitable for biomedical applications. The Ta₄C₃ MXene nanosheets showed high photothermal conversion efficiency and strong imaging capabilities. The soybean phospholipid modification enhanced biocompatibility and tumor-targeting ability. The results suggest that MXenes can be used as a theranostic platform for cancer treatment. The dual-mode imaging and photothermal ablation capabilities make these nanosheets a promising candidate for future applications. The study provides a new approach for using MAX-phase materials in biomedicine. The findings indicate that careful tuning of composition and nanostructure can meet the requirements of biomedical applications. The work opens new possibilities for using MXenes in theranostic applications.