Optimizing a Dynamic Infrared Emitter by Tailoring Titanium Carbide MXene Surface Chemistry
Discuss this preprint
Start a discussion What are Sciety discussions?Listed in
This article is not in any list yet, why not save it to one of your lists.Abstract
Ti 3 C 2 T x MXene has emerged as a highly promising material in nanophotonics due to its exceptional optical and thermal properties, which can be tailored through surface terminations. For the first time, we investigate the influence of Ti 3 C 2 T x MXene without (N) and with different surface terminations (-F, -O-, or -OH) on the performance of a thermal emitter with negative differential emissivity which is composed of VO 2 -tungsten (VO 2 -W) composite/SiO 2 /Ti 3 C 2 T x MXene. The W doping in VO 2 enables reversible-hysteresis emissivity behavior at a low critical temperature (~ 42°C), accompanied by negative differential emissivity between high- and low-temperature phases. While the emissivity threshold temperature remains consistent across all terminations, the average differential emissivity varies significantly. Comparative analysis revealed significant variations in differential average emissivity across surface terminations: -0.51 (VO 2 /SiO 2 /Ti 3 C 2 (OH) 2 ), -0.49 (VO 2 /SiO 2 /Ti 3 C 2 F 2 ), -0.46 (VO 2 /SiO 2 /Ti 3 C 2 ), and − 0.32 (VO 2 /SiO 2 /Ti 3 C 2 O 2 ), with hydroxyl termination showing superior performance. By engineering MXene surface terminations, this work demonstrates tunable negative emissivity modulation at low temperatures, offering promising applications in thermal control devices, light modulation, infrared tagging and identification, solar energy harvesting systems and other applications.
