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Abstract <p>A two-dimensional (2D) hybrid halide perovskite, [C<sub>6</sub>H<sub>5</sub>(CH<sub>2</sub>)<sub>4</sub>NH<sub>3</sub>]<sub>2</sub>CuCl<sub>4</sub> (4PBA-CuCl<sub>4</sub>, 4PBA = 4-phenylbutylamine), which exhibits excellent NPR, was prepared. The crystal structure was proved by single crystal X-ray diffraction at 294 K. Using density functional theory (DFT), we calculated the elastic constants with and without spin. Interestingly, the calculations results indicate that 2D 4PBA-CuCl<sub>4</sub> exhibits a very large NPR (–0.40 and –0.47). Our research strongly demonstrates that 2D hybrid materials have great potential for research in the field of materials with negative Poisson’s ratios.</p>

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Negative Poisson’s Ratio of a Two-Dimensional Copper-Based Hybrid Perovskite

  • 期刊论文

  • 发表日期：

    2026年4月23日

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  • Zongqian Tan,
  • Lingyu Wan,
  • Ping Chen,
  • Haowen Tang,
  • Kun Lv,
  • Renqiang Zhao,
  • Yani Liu

摘要

Abstract

A two-dimensional (2D) hybrid halide perovskite, [C6H5(CH2)4NH3]2CuCl4 (4PBA-CuCl4, 4PBA = 4-phenylbutylamine), which exhibits excellent NPR, was prepared. The crystal structure was proved by single crystal X-ray diffraction at 294 K. Using density functional theory (DFT), we calculated the elastic constants with and without spin. Interestingly, the calculations results indicate that 2D 4PBA-CuCl4 exhibits a very large NPR (–0.40 and –0.47). Our research strongly demonstrates that 2D hybrid materials have great potential for research in the field of materials with negative Poisson’s ratios.