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.

KI fragen

Bookmark

View Full Paper