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Updated: Jun 21, 2025

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
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通过COO沉积产生的石墨烯的结构缺陷:石墨烯电子合的影响

Cayetano Hernández-Gómez1, Pilar Prieto1,2, Carlos Morales3

  • 1Departamento de Física Aplicada, Universidad Autónoma de Madrid, 28049 Madrid, Spain.

Materials (Basel, Switzerland)
|July 13, 2024
PubMed
概括

石墨烯是一种石墨烯.

关键词:
首席执行官 CoOOO射线光电子光谱学X射线光电谱学同焦点的拉曼显微镜.石墨烯是一种石墨烯.结构缺陷 结构缺陷

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Spin–Spin Coupling: One-Bond Coupling

Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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Network Covalent Solids

Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
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¹H NMR: Long-Range Coupling

The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
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