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Related Concept Videos

MOS Capacitor01:25

MOS Capacitor

707
A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
707

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Related Experiment Video

Updated: Jun 5, 2025

Author Spotlight: Microfluidic Channel-Based Soft Electrodes and Their Application in Capacitive Pressure Sensing
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Unlocking Novel Functionality: Pseudocapacitive Sensing in MXene-Based Flexible Supercapacitors.

Eunji Kim1,2, Seongbeen Kim1, Hyeong Min Jin3,4

  • 1Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-Ro, Yuseong-Gu, Daejeon, 34141, Republic of Korea.

Nano-Micro Letters
|December 9, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a novel Pseudocapacitive Sensor using MXene materials. By altering energy storage kinetics through pH changes during bending, it achieves highly sensitive strain detection with a gauge factor of 1200.

Keywords:
Local pHMXenesOperando measurementsPseudocapacitive sensingSupercapacitors

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrochemistry

Background:

  • MXenes, a class of 2D materials, exhibit unique pseudocapacitance, making them promising for energy storage.
  • Current applications of MXenes are primarily focused on energy storage devices.
  • Understanding MXene pseudocapacitance mechanisms can unlock new functionalities.

Purpose of the Study:

  • To develop an innovative Pseudocapacitive Sensor utilizing MXene-based flexible supercapacitors.
  • To explore the switching of energy storage kinetics from pseudocapacitive to electrical double layer capacitive behavior.
  • To leverage the capacitance change for strain sensing applications.

Main Methods:

  • Fabrication of MXene-based flexible supercapacitors.
  • Investigating the effect of bending on local pH and MXene alignment in acidic and neutral electrolytes.
  • Analyzing the transition of electrochemical energy storage kinetics (Faradaic to non-Faradaic).
  • Utilizing capacitance shift for strain sensing and measuring the gauge factor.

Main Results:

  • Demonstrated pseudocapacitive sensing in acidic electrolytes, absent in neutral ones.
  • Observed increased anisotropic alignment of MXene sheets upon bending, leading to increased local pH.
  • Successfully transitioned energy storage kinetics from protonation to adsorption.
  • Developed highly sensitive Pseudocapacitive Sensors with a gauge factor of approximately 1200.

Conclusions:

  • The developed Pseudocapacitive Sensor effectively utilizes MXene's tunable energy storage kinetics for strain sensing.
  • This work expands the application scope of MXenes and pseudocapacitance beyond energy storage.
  • The findings pave the way for multifunctional electronics in robotics, biomedical devices, and health monitoring.