Organic‐Base‐Driven Intercalation and Delamination for the Production of Functionalized Titanium Carbide Nanosheets with Superior Photothermal Therapeutic Performance

Abstract

The delamination of titanium carbide sheets, an intriguing class of two-dimensional materials, has been critically dependent on the extraction of interlayer Al in acidic media, such as concentrated hydrofluoric acid (HF) or a mixture of hydrochloric acid (HCl) and a fluoride salt. Herein, we report an organic-base-driven intercalation and delamination of titanium carbide that takes advantage of the amphoteric nature of interlayer Al. The resulting aluminum-oxoanion-functionalized titanium carbide sheets manifested unusually strong optical absorption in the near-infrared (NIR) region with a mass extinction coefficient as high as 29.1 L g cm at 808 nm. Thus, the performance of this material is comparable or even superior to that of state-of-the-art photoabsorption materials, including gold-based nanostructures, carbon-based materials, and transition-metal dichalcogenides. Preliminary studies show that the titanium carbide sheets serve as efficient photothermal agents against tumor cells.

Surface Modified MXene‐Based Nanocomposites for Electrochemical Energy Conversion and Storage

“…However, the above‐mentioned concentrated NaOH solution needs to be heated under a high temperature and pressure hydrothermal condition, which may also have safety concerns. Therefore, Cheng and co‐workers recently developed a moderate organic base etching method toward the delamination of Ti 3 AlC 2 , in which the tetramethylammonium hydroxide (TMAOH) was chosen as the etchant ( Figure ) . Commercially, TMAOH is an efficient Al etching ingredient.…”

“…The cleavage of TiAl metallic bonds and bulky‐ion intercalation facilitates the subsequent disassembly of the precursor layered crystals into their elementary layers. Reproduced with permission . Copyright 2016, Wiley‐VCH.…”

“…It is obvious that reactions and are similar to reactions and , merely replacing reaction with in the electrolysis condition. Interestingly, the authors did not take the Al(OH) 4 − anions into consideration, which was claimed to be the terminal groups in Cheng and co‐workers' work …”

“…i) Ti 3 C 2 T m powder obtained using aqueous TMAOH. Reproduced with permission . Copyright 2016, Wiley‐VCH.…”

White Photoluminescent Ti3C2 MXene Quantum Dots with Two‐Photon Fluorescence

“…[31][32][33][34][35][36][37] In the same context, reducing the lateral size of MXenes to the nanoscale may further increase their diversity. [39,40] Functionalized Ti 3 C 2 @PEG quantum dots have also been produced by a top-down hydrothermal method. For example, monolayered Ti 3 C 2 MXene quantum dots (Ti 3 C 2 MQDs) of 2.9 nm in size have been produced by a top-down hydrothermal method.…”