Nanotechnology Now

Our NanoNews Digest Sponsors
Heifer International



Home > Press > Graphene grows – and we can see it

Pieces of a graphene lattice made from patchy particles. Because the particles can be followed one-by-one, defects can be studied at the particle scale. Image: Swinkels et al.

CREDIT
Swinkels et al
Pieces of a graphene lattice made from patchy particles. Because the particles can be followed one-by-one, defects can be studied at the particle scale. Image: Swinkels et al. CREDIT Swinkels et al

Abstract:
Graphene is the strongest of all materials. On top of that, it is exceptionally good at conducting heat and electrical currents, making it one of the most special and versatile materials we know. For all these reasons, the discovery of graphene was awarded the Nobel Prize in Physics in 2010. Yet, many properties of the material and its cousins are still poorly understood – for the simple reason that the atoms they are made up of are very difficult to observe. A team of researchers from the University of Amsterdam and New York University have now found a surprising way to solve this issue.

Graphene grows – and we can see it

Amsterdam, Netherlands | Posted on March 24th, 2023

Two-dimensional materials, consisting of a hyper-thin single layer of atomic crystal, have attracted a lot of attention recently. This well-deserved attention is mainly due to their unusual properties, very different from their three-dimensional ‘bulk’ counterparts. Graphene, the most famous representative, and many other two-dimensional materials, are nowadays researched intensely in the laboratory. Perhaps surprisingly, crucial to the special properties of these materials are defects, locations where the crystal structure is not perfect. There, the ordered arrangement of the layer of atoms is disturbed and the coordination of atoms changes locally.

Visualizing atoms
Despite the fact that defects have been shown to be crucial for a material’s properties, and they are almost always either present or added on purpose, not much is known about how they form and how they evolve in time. The reason for this is simple: atoms are just too small and move too fast to directly follow them.

In an effort to make the defects in graphene-like materials observable, the team of researchers, from the UvA-Institute of Physics and New York University, found a way to build micrometre-size models of atomic graphene. To achieve this, they used so-called 'patchy particles’. These particles – large enough to be easily visible in a microscope, yet small enough to reproduce many of the properties of actual atoms – interact with the same coordination as atoms in graphene, and form the same structure. The researchers built a model system and used it to obtain insight into defects, their formation and evolution with time. Their results were published in Nature Communications this week.

Building graphene
Graphene is made up of carbon atoms that each have three neighbours, arranged in the well-known ‘honeycomb’ structure. It is this special structure that lends graphene its unique mechanical and electronic properties. To achieve the same structure in their model, the researchers used tiny particles made of polystyrene, decorated with three even tinier patches of a material known as 3-(trimethoxysilyl)propyl – or TPM for short. The configuration of the TPM patches mimicked the coordination of carbon atoms in the graphene lattice. The researchers then made the patches attractive so that the particles could form bonds with each other, again in analogy with the carbon atoms in graphene.

After being left alone for a few hours, when observed under a microscope the ‘mock carbon’ particles turned out to indeed arrange themselves into a honeycomb lattice. The researchers then looked in more detail at defects in the model graphene lattice. They observed that also in this respect the model worked: it showed characteristic defect motifs that are also known from atomic graphene. Contrary to real graphene, the direct observation and long formation time of the model now allowed the physicists to follow these defects from the very start of their formation, up to the integration into the lattice.

Unexpected results
The new look at the growth of graphene-like materials immediately led to new knowledge about these two-dimensional structures. Unexpectedly, the researchers found that the most common type of defect already forms in the very initial stages of growth, when the lattice is not yet established. They also observed how the lattice mismatch is then ‘repaired’ by another defect, leading to a stable defect configuration, which either remains or only very slowly heals further to a more perfect lattice.

Thus, the model system not only allows to rebuild the graphene lattice on a larger scale for all sorts of applications, but the direct observations also allow insights into atomic dynamics in this class of materials. As defects are central to the properties of all atomically thin materials, these direct observations in model systems help further engineer the atomic counterparts, for example for applications in ultra-lightweight materials and optical and electronic devices.

####

For more information, please click here

Contacts:
Laura Erdtsieck
Universiteit van Amsterdam

Office: 0031-205-252-695

Copyright © Universiteit van Amsterdam

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

ARTICLE TITLE

Related News Press

2 Dimensional Materials

Rensselaer researcher uses artificial intelligence to discover new materials for advanced computing Trevor Rhone uses AI to identify two-dimensional van der Waals magnets May 12th, 2023

With new experimental method, researchers probe spin structure in 2D materials for first time: By observing spin structure in “magic-angle” graphene, a team of scientists led by Brown University researchers have found a workaround for a long-standing roadblock in the field of two May 12th, 2023

Breakthrough in the optical properties of MXenes - two-dimensional heterostructures provide new ideas May 12th, 2023

Graphene/ Graphite

With new experimental method, researchers probe spin structure in 2D materials for first time: By observing spin structure in “magic-angle” graphene, a team of scientists led by Brown University researchers have found a workaround for a long-standing roadblock in the field of two May 12th, 2023

News and information

Study demonstrates that Ta2NiSe5 is not an excitonic insulator international research team settles the decade-long debate around the microscopic origin of symmetry breaking in the bulk crystal May 12th, 2023

Laser direct writing of Ga2O3/liquid metal-based flexible humidity sensors May 12th, 2023

Breakthrough in the optical properties of MXenes - two-dimensional heterostructures provide new ideas May 12th, 2023

Possible Futures

Researchers at Purdue discover superconductive images are actually 3D and disorder-driven fractals May 12th, 2023

Laser direct writing of Ga2O3/liquid metal-based flexible humidity sensors May 12th, 2023

Breakthrough in the optical properties of MXenes - two-dimensional heterostructures provide new ideas May 12th, 2023

Novel design perovskite electrochemical cell for light-emission and light-detection May 12th, 2023

Chip Technology

Rensselaer researcher uses artificial intelligence to discover new materials for advanced computing Trevor Rhone uses AI to identify two-dimensional van der Waals magnets May 12th, 2023

With new experimental method, researchers probe spin structure in 2D materials for first time: By observing spin structure in “magic-angle” graphene, a team of scientists led by Brown University researchers have found a workaround for a long-standing roadblock in the field of two May 12th, 2023

Study demonstrates that Ta2NiSe5 is not an excitonic insulator international research team settles the decade-long debate around the microscopic origin of symmetry breaking in the bulk crystal May 12th, 2023

Laser direct writing of Ga2O3/liquid metal-based flexible humidity sensors May 12th, 2023

Discoveries

With new experimental method, researchers probe spin structure in 2D materials for first time: By observing spin structure in “magic-angle” graphene, a team of scientists led by Brown University researchers have found a workaround for a long-standing roadblock in the field of two May 12th, 2023

Study demonstrates that Ta2NiSe5 is not an excitonic insulator international research team settles the decade-long debate around the microscopic origin of symmetry breaking in the bulk crystal May 12th, 2023

Laser direct writing of Ga2O3/liquid metal-based flexible humidity sensors May 12th, 2023

Breakthrough in the optical properties of MXenes - two-dimensional heterostructures provide new ideas May 12th, 2023

Materials/Metamaterials

Nanobiotechnology: How Nanomaterials Can Solve Biological and Medical Problems April 14th, 2023

New Developments in Biosensor Technology: From Nanomaterials to Cancer Detection April 14th, 2023

Diamond cut precision: University of Illinois to develop diamond sensors for neutron experiment and quantum information science April 14th, 2023

A universal HCl-assistant powder-to-powder strategy for preparing lead-free perovskites March 24th, 2023

Announcements

Study demonstrates that Ta2NiSe5 is not an excitonic insulator international research team settles the decade-long debate around the microscopic origin of symmetry breaking in the bulk crystal May 12th, 2023

Laser direct writing of Ga2O3/liquid metal-based flexible humidity sensors May 12th, 2023

Breakthrough in the optical properties of MXenes - two-dimensional heterostructures provide new ideas May 12th, 2023

Novel design perovskite electrochemical cell for light-emission and light-detection May 12th, 2023

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers/Posters

Researchers at Purdue discover superconductive images are actually 3D and disorder-driven fractals May 12th, 2023

Laser direct writing of Ga2O3/liquid metal-based flexible humidity sensors May 12th, 2023

Breakthrough in the optical properties of MXenes - two-dimensional heterostructures provide new ideas May 12th, 2023

Novel design perovskite electrochemical cell for light-emission and light-detection May 12th, 2023

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project