チタンカーバイドMXenesにおける超高速電荷輸送を制御する光熱効果
Wenhao Zheng1,2,3, Hugh Ramsden4, Stefano Ippolito5
1Max Planck Institute for Polymer Research, Ackermannweg 10, Mainz, Germany.
Abstract:
Titanium carbide MXene (Ti₃C₂Tₓ) is an emerging metallic material with promise for (opto)electronics and thermal management. Yet how photoexcitation-particularly via photogenerated thermal energy-modifies its charge carrier dynamics remains poorly understood. By combining time-resolved terahertz spectroscopy and transient reflectance measurements, we reveal a long-lived, photo-induced suppression of conductivity, which we attribute to efficient lattice heating and slow heat dissipation in Ti₃C₂Tx. A systematic variation of pump photon energy reveals that this 'negative' photoconductivity can equivalently be induced by lattice temperature increases, indicating a thermal origin. Repetition-rate-dependent transient reflectance measurements further show residual heat persisting over 100 ns, substantially longer than in conventional metals. Our work presents a unified understanding of photothermal effects in Ti₃C₂Tₓ and their influence on non-equilibrium charge transport, underscoring its potential for photothermal electronics and light-to-thermal energy storage applications.
関連する概念動画
Atomic Radii and Effective Nuclear Charge
Facilitated Transport
Formal Charges
Secondary Active Transport
Ions and Ionic Charges
Short-distance Transport of Resources


