Measuring the mechanical properties of flexible crystals using bi-modal atomic force microscopy
Literature Information
Madeleine F. Dupont, Edwin Mayes, Kay Latham
Flexible crystals are an emerging class of material with unique properties and a range of potential applications. Their relatively recent development means that mechanical characterisation protocols have not yet been widely established. There is a lack of quantitative flexibility measurements, such as the elastic modulus (Young's modulus), reported in the literature. In this work, we investigate amplitude modulated–frequency modulated atomic force microscopy (AM–FM AFM) as a fast, versatile method for measuring the elastic modulus of single flexible crystals. Specifically, the elastic modulus of single crystals of copper(II) acetylacetonate (Cu(acac)2) was measured. The elastic modulus for Cu(acac)2 was found to be 4.79 ± 0.16 GPa. Importantly, this technique was able to map the variation in mechanical properties over the surface of the material with nanoscale resolution, showing some degree of correlation between surface morphology and elastic modulus. Additionally, the distribution of elastic modulus values can be measured at different locations on the crystal, giving a statistically robust distribution, which cannot be achieved using other methods.
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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.










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