CA2DM achieves Occupational Health & Safety KPIs

Centre for Advanced 2D Materials (CA2DM) is delighted to recognise the great achievement in Occupational Health and Safety through KPIs review conducted by NUS senior management on September 2019.

This achievement is a testament to everyone on their continued dedication and commitment to ensure health and safety in all of CA2DM research facilities. Awarded with ‘Commitment Award’, CA2DM established and implemented Occupational Health & Safety Management System (OHSMS); as accordance to OHSAS 18001 and Singapore Standard SS 506 in Year 2016.

Professor Antonio Castro Neto, Director of CA2DM, receiving the Commitment Award from Professor Yong Kwet Yew, Senior Vice President of Campus Infrastructure, during the NUS Safety & Health Award 2017 ceremony.
(Photo taken by NUS OSHE)

These achievements represent CA2DM’s beliefs on the use of best practices and reaffirm its commitment on ensuring compliance to regulations and providing a safe environment for staff, students, researchers and collaborators at all times. CA2DM adopts a holistic approach towards Occupational Health and Safety. Continuous support and collaboration efforts between individual and leadership is the key to achieving these excellence.

“CA2DM has come a long way for Health & Safety and we are most glade to achieve a level of recognition from our management. We will continue to strive for higher levels and it will always be a journey for us.”
–  Mr. Ang Han Siong, Senior Associate Director of CA2DM

 “Managing and obtaining an excellent occupational health and safety results in a complex and ever changing environment filled with extraordinary multicultural mix of researchers; this is a milestone of enormous value!”
–  Mr. Liaw Jinle (Zinc), Lead of Occupational Health & Safety at CA2DM

CA2DM’s Daria Andreeva joins NUS Materials Science and Engineering Department as Associate Professor

Daria Andreeva is a physical chemist who now applies her knowledge in the context of development and investigation of dynamic stimuli responsive materials, materials that can change properties on demand.

Daria has authored more than 80 research papers and received various fellowships (e.g. AvH, DAAD, DFG, UNESCO, etc.).

In the past, Daria has studied self-adaptive polymer membranes, dynamic properties of polyelectrolyte multilayers, layer-by-layer assemblies of charged macromolecules, for active corrosion protection. She leaded a physical chemistry group at the University of Bayreuth, Germany in 2009-2016. Having finishing her habilitation, she joined the Centre for Soft and Living Matter, South Korea, in 2016, and the Centre for Advanced 2D Materials, Singapore, in 2017.

Daria currently focuses on the design of 2D membranes with programmable functionalities. She explores electrochemical phenomena in self-assembled polyelectrolytes and 2D materials for smart ionic transport and energy harvesting.

CA2DM reaches an h-index of 100 in less than 10 years

In less than 10 years, the Centre for Advanced 2D Materials, initially known as Graphene Research Centre, published over 1000 research papers.

At least 100 of these publications have by now been cited 100 times or more; in other words, CA2DM reached an h-index of 100 in less than 10 years.

Since CA2DM was also one of the first centres in the world dedicated to graphene and two-dimensional materials, we use the “m-quotient”, defined as the h-index divided by the number of years since the first publication, to compare its research impact with similar centres.

Among CA2DM’s highly cited publications are studies on graphene, black phosphorous, transition metal dichalcogenides, van der Waals heterostructures and topological insulators.

CA2DM’s full publication list can be found at here.

2DMatPedia, an open computational database of two-dimensional materials from top-down and bottom-up approaches

CA2DM researchers, in collaboration with researchers from the Materials Project and using resources from Singapore’s National Supercomputing Centre, have created an open database of potential 2D materials generated from both computational exfoliation and chemical substitution, available online at http://2dmatpedia.org.

It was now published on Nature’s Scientific Data, a peer-reviewed, open-access journal for descriptions of scientifically valuable datasets, and research that advances the sharing and reuse of scientific data.

Full text online: https://www.nature.com/articles/s41597-019-0097-3

Black phosphorus and its isoelectronic materials

Abstract:

The family of 2D and layered materials has been expanding rapidly for more than a decade. Within this large family of hundreds of materials, black phosphorus and its isoelectronic group IV monochalcogenides have a unique place. These puckered materials have distinctive crystalline symmetries and exhibit various exciting properties, such as high carrier mobility , strong infrared responsivity , widely tunable bandgap, in-plane anisotropy and spontaneous electric polarization. Here, we review their basic properties, highlight new electronic and photonic device concepts and novel physical phenomena and discuss future directions.

Key Points:

  • The crystalline symmetries of layered black phosphorus and its isoelectronic group IV monochalcogenides play a very important role in the determination of their physical properties.
  • Black phosphorus is likely to be the layered semiconductor material with the highest carrier mobility at room temperature, making it promising for high-performance electronic applications.
  • Black phosphorus, arsenic phosphorus and other group V alloys may find applications in mid-infrared photonics as alternative material systems owing to their layered nature and moderate bandgap.
  • Monolayer group IV monochalcogenides have a broken inversion symmetry and spontaneous in-plane electric polarization. They present a great platform for the exploration of piezoelectricity, ferroelectricity, ferroelasticity and multiferroics.
  • In black phosphorus and other group V alloys, the interplay between the crystal symmetry and spin–orbit coupling may lead to the realization of rich topological states.
  • Wafer-scale synthesis of this group of materials remains challenging. Future research may leverage the phase transition induced by pressure, temperature or high-intensity light.

Read the full article here: https://www.nature.com/articles/s42254-019-0043-5
For those without a subscription, a read online version is also available at
https://rdcu.be/bvAWB

Nobel Laureate Konstantin Novoselov joins CA2DM !

Prof Novoselov has been an international scientific advisor to the NUS Centre for Advanced 2D Materials since 2015. He will be the first Nobel Laureate to join a Singapore university.

The man behind graphene, the revolutionary supermaterial

Prof Novoselov and Professor Sir Andre Geim were awarded the Nobel Prize for Physics in 2010 for their ground-breaking achievements with the two-dimensional material graphene. Then 36, Prof Novoselov was the youngest Nobel Laureate in Physics since 1971 and the youngest overall since 1992. 

The joint discovery of graphene by Prof Novoselov and Prof Geim not only led to the discovery of a new material that is the world’s most conductive, stretchable and strongest, it also opened up an entirely new area of multidisciplinary research

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CA2DM researchers transformed recovered carbon black (rCB) into dazzling multicolour fluorescence and visual display

CA2DM researchers transformed recovered carbon black (rCB), a very economical and abundance source of material, into dazzling multicolour fluorescence and visual display, by way of a scanning focused laser treatment. This laser-initiated process is both straightforward and versatile, catering to both micro- and macro-scopic patterning with the sample in ambient or helium environment.

The observed phenomenon is attributed to both chemical and structural induced colouration of rCB powder. Chemically, carbon infusion of oxidised metal occurs when photothermal reaction takes place in ambient. After laser modification with the sample in helium environment, the powder not only fluoresces due to sulphur impurities, control annealing of these powders results in formation of periodic arrangements of carbon nanoparticles.

The periodicity of these arrangement falls within the range of visible wavelength, hence contributing to the visually observable rainbow coloured rCB flakes. The patterned sample is also transferrable using PDMS stamps. This in turn broadens the application of this material in flexible electronic devices/displays.

Photocurrent measurements show most significant enhancement under yellow light illumination. Furthermore, in the presence of an applied potential, the fluorescence detected from the sample can easily be switched off. All in all, they present a simple process to add multiple functionalities to a material that is both inexpensive and sustainable.”

https://link.springer.com/article/10.1007/s12274-018-2239-x

Tailoring a large area pseudo-magnetic field in graphene by placing it on a crystal with different symmetry

Figure 1: (Left) The lattice mismatch between the monolayer graphene (black) on multilayer black phosphorous (blue) generates PMF on the graphene layer. (Right) The spatial distribution and intensity of the PMF can be tailored by changing the rotation angle between the graphene and black phosphorous. (Image: NUS)

NUS researchers have discovered a simple and effective method to produce a large area pseudo-magnetic field (PMF) on graphene, and demonstrated how it can be tuned with desired spatial distribution and intensity for data storage and logic applications (“Tailoring sample-wide pseudo-magnetic fields on a graphene-black phosphorus heterostructure“).

The field of electronics focuses on how to control and exploit the properties of electrons. To study or modify the properties of these electrons at the quantum regime, a magnetic field has to be applied. Continue Reading

Scientists solve 65-year-old open theoretical problem on electron interactions

New discovery published in Science explains what happens during the phase transition in Dirac materials, paving the way for engineering advanced electronics that perform significantly faster

Shaffique Adam, who holds joint appointments in Centre for Advanced 2D Materials and the Department of Physics at the National University of Singapore, is the lead author for a recent work that describes a model for electron interaction in Dirac materials, a class of materials that includes graphene and topological insulators, solving a 65-year-old open theoretical problem in the process. The discovery will help scientists better understand electron interaction in new materials, paving the way for developing advanced electronics such as faster processors. The work was published in the peer-reviewed academic journal Science on 10 August 2018.

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Graphene enters the stratosphere

Graphene’s usefulness on Earth has already been established in the last decade. It is now an opportune time to expand its prospects for use in space applications – an area touted as being the most challenging to modern technology – and shift the paradigm of materials science. Space is the final frontier for graphene research, and I believe this is the first time that graphene has entered the stratosphere,”
– Professor Antonio Castro Neto

On 30 June 2018, the spacecraft was launched over the Mojave Desert in the United States. CA2DM has teamed up with US-based aerospace company Boreal Space to test the properties of graphene after it has been launched into the stratosphere. The results could provide insights into how graphene could be used for space and satellite technologies.

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