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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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Energy Bands in Solids01:01

Energy Bands in Solids

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Isolated atoms have discrete energy levels that are well described by the Bohr model. And, it quantifies the energy of an electron in a hydrogen atom as En. Higher quantum numbers 'n' yield less negative, closer electron energy levels.
 Band Formation:
When atoms are brought close together, as in a solid, these discrete energy levels begin to split due to the overlap of electron orbitals from adjacent atoms. This split occurs because of the Pauli exclusion principle, which states...
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Network Covalent Solids02:18

Network Covalent Solids

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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.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
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Fermi Level Dynamics01:12

Fermi Level Dynamics

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The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
357
Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

904
The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse....
904
Fermi Level01:18

Fermi Level

851
The Fermi-Dirac function is represented by an S-shaped curve indicating the probability of an energy state being occupied by an electron at a given temperature. The Fermi level is the energy level at which there is a fifty percent chance of finding an electron, and it is positioned between the lower-energy valence band and the higher-energy conduction band.
At absolute zero temperature, electrons fill all energy states up to the Fermi level, leaving upper states empty. As the temperature rises,...
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A Standard and Reliable Method to Fabricate Two-Dimensional Nanoelectronics
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2D materials: increscent quantum flatland with immense potential for applications.

Pranay Ranjan1, Snehraj Gaur2, Himanshu Yadav2

  • 1Department of Metallurgical and Materials Engineering, Indian Institute of Technology Jodhpur, Karwar, 342037, Rajasthan, India. pranay.ranjan@iitj.ac.in.

Nano Convergence
|June 6, 2022
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Two-dimensional (2D) quantum materials, including Xenes and MXenes, offer unique properties for advanced sensors and electronic devices. Further research into synthesis and inter-layer coupling will unlock large-scale applications in energy and displays.

Keywords:
2D materialsApplicationsCharacterizationSynthesis

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Area of Science:

  • Materials Science and Engineering
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • The field of two-dimensional (2D) quantum materials, or "quantum flatland," has rapidly expanded to include diverse classes like Xenes, transition metal dichalcogenides (TMDCs), and MXenes.
  • Each 2D material possesses unique structural phases, leading to distinct electronic structures and tunable physical/chemical properties.
  • Early discoveries, such as graphene's exceptional electronic mobility and quantum Hall effect, highlighted the potential of 2D materials.

Purpose of the Study:

  • To review the expanding landscape of 2D quantum materials and their diverse properties.
  • To highlight current and emerging applications of 2D materials in sensing, electronics, photonics, and energy.
  • To identify key challenges and future research directions for large-scale applications and novel device development.

Main Methods:

  • Literature review and synthesis of existing research on 2D quantum materials.
  • Analysis of structure-property relationships in various 2D material classes.
  • Exploration of reported applications and future potential based on material characteristics.

Main Results:

  • 2D materials exhibit excellent electronic mobility and environmental sensitivity, enabling applications in high-precision sensors (gas, light, strain) and molecular detection.
  • Successful integration of 2D materials, their derivatives, and heterostructures into electronic, photonic, optoelectronic, spintronic, and straintronic devices.
  • Emerging quantum phenomena in 2D materials, including superconductivity in moiré heterostructures and applications in metamaterials and electromagnetic shielding, are expanding their technological scope.

Conclusions:

  • The unique properties of 2D materials, such as high surface area and mechanical strength, support their use as nanofillers in composites and advanced materials.
  • While lab-scale demonstrations are prevalent, challenges remain in achieving large-scale synthesis of defect-free 2D crystals for applications like solar cells, LEDs, and catalysis.
  • Future advancements hinge on overcoming in-plane doping challenges and understanding inter-layer coupling effects for next-generation heterolayer devices and sensors.