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Related Concept Videos

Mnemonic Devices01:23

Mnemonic Devices

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Mnemonic devices are cognitive tools that facilitate memory retention by linking new information to familiar patterns or organizational strategies. These techniques are beneficial for remembering complex or lengthy sets of information by simplifying and structuring them in easily retrievable ways.
Acronyms
Acronyms are created by using the initial letters of a series of words to form a new word or phrase. This approach condenses complex information into a single, memorable entity. For example,...
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Non-ohmic Devices00:51

Non-ohmic Devices

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In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and resistance is known as Ohm's law. Nonohmic devices do not exhibit a linear relationship between voltage and current. One such device is the semiconducting circuit element known as a diode. A diode is a circuit device that allows current flow in only one direction.
Consider a simple circuit consisting of a battery, a diode, and a resistor. A...
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¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

1.3K
At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
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¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR

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The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
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Lewis Acids and Bases02:33

Lewis Acids and Bases

48.6K
In 1923, G. N. Lewis proposed a generalized definition of acid-base behavior in which acids and bases are identified by their ability to accept or to donate a pair of electrons and form a coordinate covalent bond.
A coordinate covalent bond (or dative bond) occurs when one of the atoms in the bond provides both bonding electrons. For example, a coordinate covalent bond occurs when a water molecule combines with a hydrogen ion to form a hydronium ion. A coordinate covalent bond also results when...
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Weak Base Solutions03:21

Weak Base Solutions

25.6K
Some compounds produce hydroxide ions when dissolved by chemically reacting with water molecules. In all cases, these compounds react only partially and so are classified as weak bases. These types of compounds are also abundant in nature and important commodities in various technologies. For example, global production of the weak base ammonia is typically well over 100 metric tons annually, being widely used as an agricultural fertilizer, a raw material for chemical synthesis of other...
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Optimized Fabrication Procedure for High-Quality Graphene-based Moir&#233; Superlattice Devices
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Flexible graphene-based electroluminescent devices.

Ze-gao Wang1, Yuan-fu Chen, Ping-jian Li

  • 1State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China.

ACS Nano
|August 17, 2011
PubMed
Summary
This summary is machine-generated.

Flexible alternating current electroluminescence (ACEL) devices utilize large-area, chemical vapor deposition (CVD)-grown graphene films as transparent conductive electrodes. Single-layer graphene electrodes offer optimal performance, demonstrating high flexibility and potential for optoelectronics.

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Development of a 3D Graphene Electrode Dielectrophoretic Device
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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Transparent conductive electrodes are crucial for optoelectronic devices.
  • Traditional indium tin oxide (ITO) electrodes are brittle and limit device flexibility.
  • Graphene offers a promising alternative due to its unique electrical and optical properties.

Purpose of the Study:

  • To investigate the use of large-area chemical vapor deposition (CVD)-grown graphene films as transparent conductive electrodes in flexible alternating current electroluminescence (ACEL) devices.
  • To determine the optimal graphene layer configuration for ACEL device performance.
  • To evaluate the flexibility and durability of graphene-based ACEL devices.

Main Methods:

  • Large-area CVD-grown graphene films were synthesized.
  • Graphene films were transferred onto flexible polyethylene terephthalate (PET) substrates.
  • Flexible ACEL devices were fabricated using single-layer and multi-layer graphene electrodes.
  • Device performance metrics including turn-on voltage, luminance, and luminous efficiency were measured.
  • Device flexibility was tested under various strain conditions.

Main Results:

  • Flexible ACEL devices with single-layer graphene electrodes exhibited a turn-on voltage of 80 V.
  • At 480 V (16 kHz), luminance and luminous efficiency reached 1140 cd/m(2) and 5.0 lm/W, respectively.
  • Increased graphene layers led to higher turn-on voltage and decreased luminance, indicating single-layer is optimal.
  • The graphene-based ACEL device maintained excellent performance under a large strain of 5.4%.

Conclusions:

  • Large-area CVD-grown graphene is a viable transparent conductive electrode for flexible ACEL devices.
  • Single-layer graphene provides the best performance for these flexible optoelectronic applications.
  • The high flexibility and performance under strain highlight the potential of graphene in next-generation flexible electronics.