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Highly Decoupled Graphene Multilayers: Turbostraticity at its Best
Umesha Mogera1, Radhakrishnan Dhanya1, Rajashekhar Pujar1
1Chemistry and Physics of Materials Unit and Thematic Unit on Nanochemistry, Jawaharlal Nehru Centre for Advanced Scientific Research , Jakkur P.O., Bangalore 560064, India.
The Journal of Physical Chemistry Letters
|October 27, 2015
Summary
Researchers created a new type of multilayer graphene that mimics suspended graphene. This turbostratically decoupled graphene maintains high 2D crystallinity and shows properties similar to freestanding graphene sheets.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Graphene's unique properties are best observed when it is not influenced by a substrate.
- Achieving suspended-like graphene properties in a multilayer form is a significant challenge.
Purpose of the Study:
- To develop a new type of multilayer graphene that emulates suspended graphene.
- To investigate the structural and electronic properties of this novel graphene material.
Main Methods:
- Large-area synthesis of multilayer graphene via Joule heating of hydrocarbon-coated Nickel foil.
- Characterization using Raman spectroscopy, electron diffraction, and X-ray diffraction.
- Measurement of c-axis resistance to assess electronic decoupling.
Main Results:
- The synthesized multilayer graphene exhibits turbostratically decoupled layers with high 2D crystallinity.
- Raman spectra show narrow 2D bands and high I2D/IG ratios, characteristic of suspended graphene.
- Electron diffraction and X-ray diffraction confirm layer decoupling, supported by significantly higher c-axis resistance.
Conclusions:
- The novel multilayer graphene closely resembles suspended graphene in its properties.
- This material offers a promising platform for exploring graphene's intrinsic characteristics without substrate interference.
