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Related Concept Videos

Switching of BJT01:22

Switching of BJT

Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch.
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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
Crystal Field Theory - Octahedral Complexes02:58

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Crystal Field Theory
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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Tetrahedral Complexes
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Switching kinetics of a Cu2S-based gap-type atomic switch.

Alpana Nayak1, Tohru Tsuruoka, Kazuya Terabe

  • 1WPI Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Ibaraki, Japan. NAYAK.Alpana@nims.go.jp

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Switching time in copper sulfide (Cu2S) atomic switches decreases exponentially with higher temperatures and bias voltages. Lower initial resistance also accelerates switching, suggesting electric field influence alongside chemical reactions.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid-State Physics

Background:

  • Atomic switches offer a novel concept for future electronic devices.
  • Understanding the operational mechanisms of these switches is crucial for their development.

Purpose of the Study:

  • To investigate the switching time of a Cu2S-based gap-type atomic switch.
  • To determine the influence of temperature, bias voltage, and initial off-resistance on switching speed.

Main Methods:

  • Utilized a scanning tunneling microscope (STM) to create a gap-type atomic switch.
  • Controlled the formation and annihilation of a copper (Cu) atom bridge via solid-electrochemical reactions.
  • Varied temperature, bias voltage, and initial off-resistance to observe effects on switching time.

Main Results:

  • Switching time decreased exponentially with increasing temperature, showing an activation energy of approximately 1.38 eV.
  • Switching time shortened exponentially with increasing bias voltage, with a more pronounced effect at lower voltages.
  • Decreasing the initial off-resistance led to faster switching speeds.

Conclusions:

  • The study suggests that the electric field in the vacuum gap significantly influences atomic switch operation, in addition to chemical reactions.
  • This research advances the understanding of atomic switch mechanisms for potential use in next-generation electronics.