Two‐Dimensional La 2 CoO 4 Perovskite Oxide Enabled by Phonon‐Resonance‐Driven Exfoliation for High‐Performance Gas Sensing

ABSTRACT Strong electron‐phonon interactions in layered Ruddlesden‐Popper (RP) phase oxides, such as La 2 CoO 4 , present a major challenge for accessing their 2D counterparts. Here, we present a rapid and efficient exfoliation strategy that leverages the resonance between ultrasonic phonon waves and the intrinsic vibrational frequency of La‐O bonds within the rock‐salt interlayer, which are responsible for the strong electron‐phonon coupling. By applying a continuous phonon wave at this resonant frequency, bulk La 2 CoO 4 is exfoliated into 2D nanosheets within minutes. This process is significantly faster than conventional ion‐insertion‐based chemical exfoliation methods, which typically require several…

• SY
  Sichuan Youth Science and Technology Foundation

  Award: 2024ZYD0010
• NN
  National Natural Science Foundation of China

  Award: 52172155
• JP
  Jiangsu Provincial Key Laboratory of Advanced Micro and Nano Materials and Technology

  Award: ASMA202201
• FR
  Fundamental Research Funds for the Central Universities

  Award: 2682024ZTPY053