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P-N junction

P-N junction

A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...

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Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding

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Published on: September 23, 2018

Chiral Nematic Graphene Films with a mesoporous Structure.

Haibo Huang^1,2, Zhong-Shuai Wu^1,3, Yixing Li⁴

¹State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)

|October 31, 2024

Summary

Researchers developed a new method to create chiral nematic graphene films. These ordered graphene films show potential for photonics, chiral separation, and energy storage applications.

Keywords:

chemical vapor deposition chiral nematic structure dendrite‐free Na anode electromagnetic shielding graphene film

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Area of Science:

Materials Science
Nanotechnology
Chemistry

Background:

Ordering graphene into a chiral nematic structure offers revolutionary potential for photonics, chiral separation, and energy storage.
Controlled fabrication of highly ordered, long-range chiral nematic mesoporous graphene films remains a significant challenge.

Purpose of the Study:

To present a novel chiral-template-directed chemical vapor deposition (CVD) growth strategy.
To achieve precise fabrication of mesoporous chiral nematic graphene films using nanocrystalline cellulose as templates.

Main Methods:

Utilized nanocrystalline cellulose as chiral templates.
Employed a chemical vapor deposition (CVD) growth strategy.
Characterized the fabricated graphene films for structural, electrical, and physical properties.

Main Results:

Successfully fabricated mesoporous chiral nematic graphene films with left-hand helical ordering.
Achieved adjustable pore sizes (6.4-13.1 nm), tailored pitch, and excellent electrical conductivity (556 S cm⁻¹).
Demonstrated high specific surface area (1508 m² g⁻¹), mechanical flexibility, uniform sodium plating without dendrites, and thickness-dependent electromagnetic shielding (35-63 dB).

Conclusions:

The developed method enables precise fabrication of mesoporous chiral nematic graphene films.
These films exhibit unique properties suitable for advanced applications in energy storage (uniform sodium plating) and electromagnetic shielding.
The tunable physicochemical properties and ordered structure open avenues for multi-disciplinary applications.