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Related Concept Videos

Quantum Numbers02:43

Quantum Numbers

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It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
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The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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Lewis Structures and Formal Charges02:19

Lewis Structures and Formal Charges

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Lewis symbols can be used to indicate the formation of covalent bonds, which are shown in Lewis structures—drawings that describe the bonding in molecules and polyatomic ions. The periodic table can be used to predict the number of valence electrons in an atom and the number of bonds that will be formed to reach an octet. Group 18 elements, such as argon and helium, have filled electron configurations and thus rarely participate in chemical bonding. However, atoms from group 17, such as...
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Formal Charges02:42

Formal Charges

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In some cases, there are seemingly more than one valid Lewis structures for molecules and polyatomic ions. The concept of formal charges can be used to help predict the most appropriate Lewis structure when more than one reasonable structure exists.
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2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

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Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
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Resonance and Hybrid Structures02:16

Resonance and Hybrid Structures

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According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
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Compact Quantum Dots for Single-molecule Imaging
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Charge-Trap Memory Based on Hybrid 0D Quantum Dot-2D WSe2 Structure.

Xiang Hou1, Heng Zhang1, Chunsen Liu1

  • 1State Key Laboratory of ASIC and System, School of Microelectronics, Fudan University, Shanghai, 200433, China.

Small (Weinheim an Der Bergstrasse, Germany)
|April 18, 2018
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel charge-trap memory device using hybrid 0D Cadmium Selenide quantum dots (QDs) and 2D Tungsten Diselenide (WSe2) nanosheets. This innovative structure demonstrates exceptional performance for advanced electronic memory applications.

Keywords:
2D semiconductorscharge-trap memorymemory windowquantum dots

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electronics

Background:

  • Layered ultrathin 2D semiconductors like Molybdenum Disulfide (MoS2) and Tungsten Diselenide (WSe2) exhibit excellent electronic properties for nonvolatile memory applications.
  • Discrete 0D metallic nanocrystals and quantum dots (QDs) are recognized as effective charge-trap materials.

Purpose of the Study:

  • To demonstrate a novel charge-trap memory device utilizing a hybrid structure of 0D Cadmium Selenide (CdSe) quantum dots (QDs) and 2D WSe2.
  • To investigate the performance characteristics of this hybrid QD-2D semiconductor memory device.

Main Methods:

  • Fabrication of a charge-trap memory device employing ultrathin WSe2 as the channel and CdSe QDs as the charge-trap layer.
  • Characterization of the device's memory window, erase/program current ratio, data storage capability, retention, and endurance.

Main Results:

  • The hybrid QD-2D WSe2 device achieved a large memory window exceeding 18 V.
  • Demonstrated a high erase/program current ratio (up to 10^4), four-level data storage, stable retention, and high endurance (>400 cycles).
  • Comparative experiments confirmed charge trapping by QDs embedded in Al2O3.

Conclusions:

  • The combination of 2D semiconductors and 0D QDs presents a promising new avenue for developing advanced charge-trap memory devices.
  • This hybrid structure offers significant potential for next-generation nonvolatile memory technologies.