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Microscopic Visualization of Porous Nanographenes Synthesized through a Combination of Solution and On-Surface Chemistry

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Reversible nanodiamond-carbon onion phase transformations.

J Xiao¹, G Ouyang, P Liu

¹State Key Laboratory of Optoelectronic Materials and Technologies, Institute of Optoelectronic and Functional Composite Materials, Nanotechnology Research Center, School of Physics and Engineering, Sun Yat-sen University , Guangzhou 510275, Guangdong People's Republic of China.

|May 15, 2014

Summary

This summary is machine-generated.

Laser irradiation enables reversible phase transformation between nanodiamonds and carbon onions, with a bucky diamond intermediate. This discovery offers insights into meteoritic nanodiamond origins and controllable carbon allotrope pathways.

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Functionalization of Single-walled Carbon Nanotubes with Thermo-reversible Block Copolymers and Characterization by Small-angle Neutron Scattering

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Area of Science:

Materials Science
Nanotechnology
Physical Chemistry

Background:

Nanodiamonds (3-5 nm) are crucial models for studying graphite-diamond phase transformations.
Understanding phase transitions in carbon allotropes is of significant scientific interest.

Purpose of the Study:

To demonstrate a reversible phase transformation between nanodiamonds and carbon onions.
To investigate the role of a bucky diamond intermediate phase.
To elucidate the underlying physics using nanoscale thermodynamic approaches.

Main Methods:

Laser irradiation of colloidal nanodiamond suspensions at ambient conditions.
Observation of intermediary bucky diamond phase during transformations.
Application of nanoscale thermodynamic models.

Main Results:

Achieved reversible nanodiamond-carbon onion phase transformation via laser irradiation.
Identified a bucky diamond phase as an intermediate in both forward and reverse transitions.
Demonstrated carbon onions acting as nanoscale temperature and pressure cells.

Conclusions:

The study reveals a novel reversible phase transformation pathway involving nanodiamonds, carbon onions, and bucky diamond.
Findings provide insights into the origin of meteoritic nanodiamonds.
Offers a method for controlled manipulation of pathways between diamond and carbon allotropes.