Stretchable [2]rotaxane-bridged MXene films applicable for electroluminescent devices
Chunyu Wang, Boyue Gao, Kai Xue, Wenbin Wang, Jun Zhao, Ruixue Bai, Tinghao Yun, Zhiwei Fan, Mengling Yang, Zhaoming Zhang, Zhaoming Zhang, Zhitao Zhang, Zhitao Zhang, Xuzhou Yan
Abstract
Titanium carbide (Ti 3 C 2 T X ) MXene has prominent mechanical properties and electrical conductivity. However, fabricating high-performance macroscopic films is challenging, as weak interlayer interactions limit their mechanical performance. Here, we introduce [2]rotaxane, a mechanically interlocked molecule, to enhance MXene films. Compared to pure MXene (fracture strain: 4.6%, toughness: 0.6 MJ/m 3 ), [2]rotaxane-bridged MXene (RBM) films achieve record-high strain (20.0%) and toughness (11.9 MJ/m 3 ) with only 3.6% [2]rotaxane by weight. Additionally, RBM films endure 500 stretch cycles (0 to 15% strain) with stable and reversible resistance alterations, making them ideal for stretchable electrodes. Notably, RBM films enable stretchable electroluminescent devices with reliable operation under 20% elongation and customizable luminescent patterns. This innovative use of mechanically interlocked molecules to cross-link MXene platelets advances MXene films and other two-dimensional materials in stretchable electronics.