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Related Concept Videos

Semiconductors01:22

Semiconductors

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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
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Somnambulism, commonly known as sleepwalking, involves individuals engaging in activities ranging from simple walking to more complex behaviors such as driving. Sleepwalking typically occurs during the slow-wave sleep stages 3 and 4 early in the night when the person is not dreaming, contradicting the myth that sleepwalkers are acting out their dreams.
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Types of Semiconductors01:20

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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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Biofunctionalization of Magnetic Nanomaterials
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Talking to cells: semiconductor nanomaterials at the cellular interface.

Menahem Y Rotenberg1, Bozhi Tian1,2,3

  • 1The James Franck Institute, the University of Chicago, Chicago, IL 60637.

Advanced Biosystems
|March 26, 2019
PubMed
Summary
This summary is machine-generated.

Silicon-based bio-interfaces are advancing the study of single cells and tissues. Miniaturized systems, including freestanding nanostructures, offer new possibilities for sensing and modulating biological electrical activity.

Keywords:
bioelectronicsmechanicalnanowiresopticalsilicon

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Bioelectronics

Background:

  • The interface between biological components and semiconductors is a rapidly expanding research area.
  • Silicon is a preferred material due to its synthesis, lithography, electronic properties, and biocompatibility.
  • Recent progress enables bio-interfaces at the single-cell and sub-cellular levels.

Purpose of the Study:

  • To review fundamental studies on miniaturizing bioelectric and biomechanical interfaces.
  • To highlight silicon-based nanoscale systems for bio-interfacing.
  • To discuss advancements in interfacing excitable and non-excitable cells.

Main Methods:

  • Focus on miniaturization of bioelectric and biomechanical interfaces.
  • Utilize freestanding silicon-based nanoscale systems and substrate-bound devices.
  • Describe interfacing techniques for neuronal, cardiac, and non-excitable cells.

Main Results:

  • Demonstrated progress in interfacing neuronal and cardiac cells and their networks.
  • Showcased semiconductor nanostructures for non-excitable cell applications.
  • Explored probing intracellular force dynamics and drug delivery.

Conclusions:

  • Miniaturized silicon bio-interfaces are crucial for understanding cellular electrical activity.
  • Freestanding nanoscale systems present significant potential for research and clinical use.
  • Future exploration directions include advanced cell interfacing applications.