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To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
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A crystal's internal structure is an orderly array of atoms, ions, or molecules, and the details of this array significantly influence the solid's properties. In a crystal, periodically repeating 'structural motifs' - which could be atoms, molecules, or groups thereof - create a 'space lattice.' This is essentially a three-dimensional, infinite array of points, each surrounded by its neighbors in an identical way, forming the basic structure of the crystal.A 'unit cell' is a theoretical...
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In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
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Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
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Atomically-thick two-dimensional crystals: electronic structure regulation and energy device construction.

Yongfu Sun1, Shan Gao, Yi Xie

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Atomically-thick two-dimensional crystals offer potential for flexible electronics. This review details characterization and electronic structure modulation for advanced nanodevices and energy applications.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Atomically-thick two-dimensional crystals are crucial for next-generation flexible and transparent nanodevices.
  • Characterizing these low-dimensional structures and understanding their structure-property relationships present significant challenges due to limited long-range order.

Purpose of the Study:

  • To review recent advancements in fine structure characterization using X-ray absorption fine structure spectroscopy.
  • To overview electronic structure modulation in ultrathin two-dimensional crystals via density-functional calculations.
  • To highlight the structure-property relationship, device construction, and applications of these materials.

Main Methods:

  • X-ray absorption fine structure (XAFS) spectroscopy for detailed structural analysis.
  • Density-functional theory (DFT) calculations for understanding electronic structure modulation.
  • Review of existing literature on device fabrication and performance.

Main Results:

  • XAFS spectroscopy provides insights into the fine structure of two-dimensional crystals.
  • DFT calculations reveal methods for modulating electronic properties.
  • Established structure-property relationships are key for device design.
  • Demonstrated applications in photoelectrochemical water splitting, photodetectors, thermoelectric conversion, sensing, supercapacitors, and batteries.

Conclusions:

  • Atomically-thick two-dimensional crystals hold significant promise for high-efficiency energy devices.
  • Further research is needed to overcome challenges in characterization and device integration.
  • This review provides a foundation for future design and development in the field.