Tailoring MXene Thickness and Functionalization for Enhanced Room-Temperature Trace NO2 Sensing

Abstract

Highlights Gas-phase functionalization of X-MXene (X = –F, –OH, –O, –Br, –I) films crafted from sub-100 nm thin MXene flakes for highly sensitive NO2 sensors. I-MXene-based senor exhibited significant sensing performances toward trace NO2 at room temperature. The hydrophobicity, larger atomic size, lower electronegativity, and reduced shielding of -I contribute to the excellent sensing enhancement of I-MXene.

Keywords

• Controlled MXene thickness
• Gaseous functionalization approach
• Lower electronegativity functional groups
• Enhanced MXene stability
• Trace NO2 sensing