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Multifunctional Macroassembled Graphene Nanofilms with High Crystallinity.

Li Peng^1,2, Ying Han³, Meihui Wang^2,4

¹MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)

|October 8, 2021

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Summary

This summary is machine-generated.

A new "cooling-contraction" method enables the large-scale production of highly crystalline graphene nanofilms from graphene oxide. These macroassembled graphene nanofilms exhibit exceptional mechanical, electrical, and thermal properties for advanced applications.

Area of Science:

Materials Science
Nanotechnology
Graphene Research

Background:

Graphene oxide (GO) films are typically nanoscale and difficult to separate from substrates.
Scalable production of high-quality graphene materials remains a challenge.

Purpose of the Study:

To develop a method for large-area separation of GO films.
To produce highly crystalline graphene nanofilms (nMAGs) with enhanced properties.
To demonstrate potential applications of the synthesized nMAGs.

Main Methods:

A
cooling-contraction
method was employed to detach nanoscale GO films from substrates.
Free-standing films underwent heat treatment at 3000°C to yield macroassembled graphene nanofilms (nMAGs).

Keywords:

graphene nanofilms high crystallinity macroassembly terahertz sensors thermoacoustic devices

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Main Results:

Achieved large-area (up to 4.2 cm) nMAGs with 16-48 nm thickness.
nMAGs demonstrated high tensile strength (5.5-11.3 GPa), electrical conductivity (1.8-2.1 MS m⁻¹), and thermal conductivity (2027-2820 W m⁻¹ K⁻¹).
Demonstrated nMAG applications including a sound generator and a THz metasurface for glucose detection.

Conclusions:

The cooling-contraction method offers a straightforward route to high-quality, crystallized graphene nanofilms from low-cost GO.
The synthesized nMAGs possess superior properties suitable for diverse technological applications.