Imaging technology reveals strain and defects in vanadium oxide

Credit: Rensselaer Polytechnic Institute

Researchers led by Edwin Fohtung, an associate professor of materials science and engineering at Rensselaer Polytechnic Institute, have found that nanostructures are transition metals that are widely used in many potential applications such as electrochemical anodes, optical applications, and supercapacitors. We have developed a new technology to reveal defects in vanadium oxide. ..In a study published in an article in the British Royal Chemistry Journal CrystEngComm, And also on the cover of the edition. The team elaborated on lensless microscopy technology to capture individual defects embedded in vanadium oxide nanoflake.

“These observations may help explain the causes of nearby structural, crystallinity, or composition gradient defects. Grain boundaries “In other thin-film or flake technologies, we believe it has the potential to change the way nanomaterials grow and non-destructive 3D imaging,” said Fohtung, an expert in new synchrotron scattering and imaging technologies. “”

Vanadium oxide is currently used in many technical fields, including: Energy storageCan also be used for, and build Field effect transistor Due to the metal-insulator transition behavior that can be adjusted by the electric field. However, material strain and defects can change functionality, requiring non-destructive techniques to detect these potential defects.

The team has developed a technology based on coherent X-ray diffraction imaging. This technology relies on a type of circular particle accelerator known as a synchrotron. Synchrotrons work by accelerating electrons through a series of magnets until they reach near the speed of light. These fast-moving electrons produce very bright and intense light, primarily in the X-ray region. As the name implies, this synchrotron radiation is millions of times brighter than the light produced by conventional light sources and 10 billion times brighter than the sun. Fohtung and his students have used this light to develop technology that has succeeded in capturing atoms, molecules, and now minute substances such as defects. When used for probes on crystalline materials, this technique is known as Bragg Coherent Diffraction Imaging (BCDI). In their study, the team used the BCDI approach to reveal nanoscale properties of electron density in crystals, such as strain and lattice defects.

Fohtung worked closely with Jian Shi, an associate professor of materials science and engineering at Renseria. They participated in a study of “imaging defects in vanadium (III) oxide nanocrystals using Bragg coherent diffraction imaging” by Rensselaer’s Zachary Barringer, Jie Jiang, Xiaowen Shi, Elijah Schold, and researchers at Carnegie Mellon University. bottom.

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For more information:
Zachary Barringer et al, Imaging of Vanadium (iii) Nanooxide Defects Using Bragg Coherent Diffraction Imaging, CrystEngComm (2021). DOI: 10.1039 / D1CE00736J

Quote: Vanadium oxide obtained on October 14, 2021 from https: // by imaging technology (October 14, 2021) ) Distortion and defects revealed

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Imaging technology reveals strain and defects in vanadium oxide

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