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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CA2DM-led research team develops cost effective technique for mass production of high-quality graphene

Novel method uses 50 times less solvent than conventional methods

CA2DM-led research team have developed an economical and industrially viable strategy to produce graphene. The new technique addresses the long-standing challenge of an efficient process for large-scale production of graphene, and paves the way for sustainable synthesis of the material.

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CA2DM Director among world’s most impactful researchers 2017

Thirteen NUS researchers have been named among the world’s most highly cited, based on Clarivate Analytics’ 2017 Highly Cited Researchers report released on 15 November. This is also the fourth consecutive year NUS has fielded the most number of highly cited researchers among research institutions in Singapore.

Clarivate Analytics’ citation analysis has shown that these researchers consistently win peer approval from around the globe for their remarkable research in their respective fields, including chemistry, computer science, engineering, materials science, mathematics, physics, psychology and social sciences.  This was determined by the extent their papers have supported, influenced, inspired and challenged other researchers internationally.

Professor Ho Teck Hua, NUS Deputy President (Research & Technology) and Tan Chin Tuan Centennial Professor, said that the University is proud of the achievements of the 13 NUS researchers that have helped raise Singapore’s global standing in research excellence, adding that it is a strong recognition of the University’s broad base of research capabilities.

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Research team led by NUS scientists breaks new ground in memory technology

Novel organic thin film significantly outperforms existing flash memory devices

An international research team led by scientists from the National University of Singapore (NUS) pioneered the development of a novel thin, organic film that supports a million more times read-write cycles and consumes 1,000 times less power than commercial flash memories.

The novel organic film can store and process data for 1 trillion cycles and has the potential to be made even smaller than its current size of 60 square nanometers, with potential to be sub-25 square nanometres.

“The novel properties of our invention opens up a new field in the design and development of flexible and lightweight devices. Our work shifts the paradigm on how the industry has traditionally viewed organic electronics, and expands the application of such technologies into new territories,” said Professor T Venky Venkatesan, Director of NUS Nanoscience and Nanotechnology Institute (NUSNNI), the overall coordinator for this groundbreaking project.

The invention of this novel memory device was first reported online in the journal Nature Materials on 23 October 2017.
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Novel “converter” invented by NUS scientists heralds breakthrough in ultra-fast data processing at nanoscale

Invention bagged four patents and could potentially make microprocessor chips work 1,000 times faster

Advancement in nanoelectronics, which is the use of nanotechnology in electronic components, has been fueled by the ever-increasing need to shrink the size of electronic devices in a bid to produce smaller, faster and smarter gadgets such as computers, memory storage devices, displays and medical diagnostic tools.

While most advanced electronic devices are powered by photonics – which involves the use of photons to transmit information – photonic elements are usually large in size and this greatly limits their use in many advanced nanoelectronics systems.

Plasmons, which are waves of electrons that move along the surface of a metal after it is struck by photons, holds great promise for disruptive technologies in nanoelectronics. They are comparable to photons in terms of speed (they also travel with the speed of light), and they are much smaller. This unique property of plasmons makes them ideal for integration with nanoelectronics.

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Space, the final frontier for Graphene and 2D Materials

Several years ago Prof. Castro Neto predicted the importance of graphene and other 2D materials on space technology and exploration: “In the space business weight is a big issue from the financial and physical perspectives. The heavier the payload the higher the cost of launching rockets and accelerating them into higher speeds. Graphene and 2D materials are the lightest functional materials in the universe and hence are perfect in terms of mass density”, says Prof. Castro Neto, “and, moreover, in the absence of air and water, 2D materials never corrode and can last indefinitely.”  Prof. Castro Neto goes further “In deep space the temperatures are so low that some 2D materials superconduct reducing the energy cost of operation to a perfect zero.”

Prof Castro Neto’s dreams of making graphene a big player in the space race are becoming reality. In collaboration with Boreal Space, a US based satellite launcher, CA2DM is soon launching the first graphene devices into orbit opening a new chapter in space exploration for 2D materials.

Find out more of this exciting news here.

RPGR 2017, another successful conference!

The 9th annual Recent Progress in Graphene and Two-dimensional Materials Research Conference (RPGR2017) follows on the success of the first eight RPGR conferences held in Seoul (2009), Singapore (2010), Suwon (2011), Beijing (2012), Tokyo (2013), Taipei (2014), Australia (2015) and Korea (2016).

The conference took place in Grand Copthorne Waterfront Hotel, Singapore from 19-22 September 2017.
It was attended by 260 participants from 21 different countries. Continue Reading

Grooming young scientists in Singapore

Research work on monolayer WS2 done by Belle Sow Miaoer, a student from NUS High School of Mathematics and Science, Dr Lu Junpeng (NUS) and Professor Sow Chorng Haur (NUS) was published and highlighted in the inside cover page of Advanced Optical Materials [1].

Monolayer WS2 is a promising material in optoelectronic devices. Decoration of WS2 using gold nanoparticles (AuNPs) produces surprising results. AuNPs exhibit preferential, site-selective decorations that reveal hidden heterogeneity within the WS2. In addition, the AuNPs enhance fluorescence intensity in selected regions and even activate fluorescence emission from previously dark regions. The photoluminescence spectra become sharpened and dominated by neutral excitons.

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