What does this research mean for the field?

The two-dimensional hybrid halide perovskite 4PBA-CuCl4 exhibits a very large negative Poisson's ratio of -0.40 to -0.47. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

This research aims to explore the properties of a two-dimensional hybrid perovskite with a negative Poisson's ratio.

April 25, 2026

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

ZTZongqian TanGuangxi University LWLingyu WanGuangxi University PCPing ChenGuangxi University

Key Points

This research aims to explore the properties of a two-dimensional hybrid perovskite with a negative Poisson's ratio.
Prepared two-dimensional hybrid halide perovskite 4PBA-CuCl4
Analyzed crystal structure via single crystal X-ray diffraction at 294 K
Calculated elastic constants using density functional theory (DFT)
The 2D 4PBA-CuCl4 exhibited large negative Poisson's ratios of –0.40 and –0.47, indicating significant material properties.
Single crystal X-ray diffraction confirmed the crystal structure at 294 K.

Abstract

A two-dimensional (2D) hybrid halide perovskite, C6H5(CH2)4NH32CuCl4 (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.

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