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MOS Capacitor

MOS Capacitor

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...

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Related Experiment Video

Updated: Jul 11, 2025

Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques

Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques

Published on: November 11, 2013

Hydrangea-like MoS₂/carbon dots anode for high-performance sodium storage.

Yan Wang¹, Qing Wang², Wuxin Liu¹

¹School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China; State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China; Hebei Key Laboratory of Dielectric and Electrolyte Functional Material, Qinhuangdao 066004, China.

Journal of Colloid and Interface Science

|November 10, 2023

Summary

Chitin-derived carbon dots (CT-CDs) synthesized MoS₂/CT-CDs with a unique hydrangea-like structure. This material shows excellent performance as an anode for sodium-ion batteries, demonstrating high capacity and stability.

Keywords:

Anodes Carbon dots MoS(2)Sodium-ion battery

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Last Updated: Jul 11, 2025

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Published on: January 30, 2018

Area of Science:

Materials Science
Electrochemistry
Nanotechnology

Background:

Carbon dots (CDs) are recognized for their quantum size, edge effects, and surface functional groups.
Chitin is a sustainable and abundant biopolymer with potential for materials synthesis.

Purpose of the Study:

To synthesize and characterize MoS₂/CT-CDs using chitin-derived carbon dots.
To evaluate the performance of MoS₂/CT-CDs as an anode material for sodium-ion batteries.

Main Methods:

Preparation of chitin-derived carbon dots (CT-CDs).
Synthesis of MoS₂/CT-CDs composite material.
Electrochemical testing of MoS₂/CT-CDs as a sodium-ion battery anode.

Main Results:

MoS₂/CT-CDs formed a hydrangea-like structure due to CT-CDs' functional groups.
Achieved an initial charging capacity of 492.6 mAh·g^-1 at 0.1 A·g^-1 with 74.4% initial Coulomb efficiency.
Demonstrated high reversible capacity (338.9 mAh·g^-1 after 100 cycles at 0.1 A·g^-1) and rate capability (219.9 mAh·g^-1 after 260 cycles at 1 A·g^-1).

Conclusions:

The unique structure of MoS₂/CT-CDs enhances ion/electron transport and provides active sites for sodium storage.
The material exhibits exceptional cycling stability and rate performance for sodium-ion batteries.
Chitin-derived carbon dots are effective in improving the electrochemical properties of MoS₂-based anode materials.