Workshop “Sensing with graphene and 2-dimensional materials”

The workshop “Sensing with graphene and 2-dimensional materials” will take place at Forum M in the city center of Aachen, Germany from November 5-6, 2018. This workshop is funded by the German Federal Ministry of Education and Research (BMBF). For more detailed information please refer to the attached Flyer_Sensor_Workshop_2018

People who are interested in this workshop are welcome to participate and invited to get registered by using the registration form.

The registration is free of charge.

Registration deadline: September, 30 2018

There will be a poster session on site. Anyone who would like to present and discuss his/her poster is also welcome. Please complete the registration form accordingly.

Please send any questions to Dr. Zhenxing Wang (wang@amo.de) or Mrs. Annabelle Kosala (kosala@amo.de).

Graphene hears the ultrasound

The research team led by Gerard Verbiest and Christoph Stampfer at the Physics Department at the RWTH Aachen University, discovered a new possibility for ultrasound detection. The physicists fabricated a graphene resonator on a silicon substrate in a way that the device could be mounted onto an ultrasound transducer. For the first time, this allowed them to measure the responds of a graphene resonator to ultrasound propagating through the substrate. They achieved a resolution of 7 pm/√Hz by making use of the unique properties of graphene. As the resolution solely depends on the electronic properties of the graphene, they show that the detection also works away from any mechanical resonance of the suspended graphene. The new insights could be very useful for numerous sensing applications at the nanoscale. The research results have now been published in the scientific journal “Nano Letters”.

Ultrasound detection is the key in visualizing subsurface features. In our daily life, ultrasound imaging is commonly used to monitor babies in wombs or to monitor micro cracks in airplanes. The direct miniaturization of these imaging techniques down to the nanoscale has proven to be a major challenge. Nanometer resolution was achieved with an atomic force microscope cantilevers; however, they show no or little responds at the required frequencies of tens of MHz. Graphene resonators now seem to resolve these issues. “The integration of a graphene resonator on the back of an atomic force microscope cantilever paves the way for high-sensitive ultrasound detection at the nanoscale on arbitrary substrates and surfaces.” analyzes Verbiest.

The new ultrasound detection scheme must first pass a number of tests, before its broad-range applicability can be evaluated. Primarily, the research team aims to identify the physical mechanism that transduces the ultrasound from the substrate into the graphene resonator. Afterwards, they plan to show a direct quantitative relation between the ultrasound in the substrate and the detected amplitude. “If these goals are achieved, the graphene-based ultrasound detector can be indeed used for subsurface imaging at the nanoscale.” says Verbiest.

The research was performed within the framework of a proposal granted by the European Research Council. In addition, the work is embedded in the ‟Aachen Graphene & 2D Materials Center,” the largest Graphene Flagship site in Germany.

 

Novel Types of Quantum Bits

The research team of Professor Markus Morgenstern, chair of experimental physics (solid state physics) at RWTH Aachen University, discovered new possibilities for quantum electronics, with the support of colleagues from the Technical University of Vienna and the University of Manchester. The physicists combined two ultrathin materials, namely graphene and Boron-Nitride, in a way which makes it possible to switch individual electrons between two states. For the first time, this allowed them to invert the so-called valley degree of freedom of the electron. The new discovery could be useful for advanced information processing. The research results have now been published in the scientific journal ‟Nature Nanotechnology”.

Continue reading “Novel Types of Quantum Bits”

RWTH AND AMO WITH GRAPHENE PAVILION AT MOBILE WORLD CONGRESS

The Graphene Flagship returns to the Mobile World Congress, bringing with it the next generation of mobile technologies. Step into the Graphene Pavilion and enter the fascinating world of graphene and related materials in an exhibition designed to bring these materials to life. Discover how they can be made in the large-scale in the Graphene Knowledge Centre and experience cutting-edge new technologies, with interactive demonstrations in Sensors and IoT, Wearables and Health, Datacom and Energy. RWTH Aachen University and AMO will present ultrafast graphene based photodetectors and fully flexible logic and RF circuits for future 5G and IoT applications.

Continue reading “RWTH AND AMO WITH GRAPHENE PAVILION AT MOBILE WORLD CONGRESS”

Aachen Graphene & 2D Materials Center welcomes two new center members in 2018

Professor Joachim Knoch, Institute of Semiconductor Electronics as well as  Professor Andrei Vescan, Institute of Compound Semiconductor Technology from RWTH Aachen University join as new members the Aachen Graphene & 2D Materials Center.

Prof. Vescan is a well-known expert for compound semiconductors, with a research focus on MOCVD material synthesis. He is currently working on the synthesis of different TMDCs. Prof. Knoch has a long experience on nano-scale semiconductor devices and works currently on new device concepts like tunneling transistors using 2D materials. These specific competences of the two new PIs are complementing and broadening the scope of the activities in the Aachen Graphene Center.

AMO/RWTH EXPLAINS GRAPHENE TO POLICY MAKERS AT TALLINN DIGITAL SUMMIT

AMO was part of the EU Graphene Flagship delegation at the Tallinn Digital Summit on September 29, 2017, where research results and key technological advances enabled by graphene and related materials were explained to European Heads of State and Government.

The Tallinn Digital Summit, held under the Estonian presidency of the Council of the European Union, is a platform for Heads of State and Government from across Europe to launch high-level discussions on digital innovation with the aim of keeping Europe ahead of the technological curve while becoming a global digital leader in the next years. The participants focussed on trends and technologies likely to emerge in the next ten years and their impact on crucial areas of security, e-government, industry, economy and society. Academic and industrial co-exhibitors from across the Graphene Flagship consortium presented many different demonstrators to illustrate the potential of graphene and related materials in Europe’s path to global digital leadership.

The presences of the EU Graphene Flagship project was a unique opportunity and a great honour at the same time to show the highest decision makers what Europe can achieve by working together towards a common goal, and demonstrates that the Flagship is well on its way to realize its ambitious goals.

Professor Max Lemme (AMO GmbH and RWTH Aachen University) explained Graphene and many of the latest Graphene Flagship achievements to the Greek prime minister Alexis Tsipras.

Professor Max Lemme, Director of AMO GmbH and Chair of Electronic Devices at RWTH Aachen University, had the opportunity to explain many of the latest Graphene Flagship achievements to the visitors, including several Europen Heads of State and Government. “Graphene is a very exciting material and we are moving our research towards higher technology levels. This is where innovation happens, and we are confident to enable new applications in (opto-)electronics and sensorics with graphene and 2D materials.” stated Professor Lemme.

The Graphene Flagship exhibition area showcased the work of academic and industrial co-exhibitors from across the consortium on five application areas: sensors and the Internet of Things, devices for the digital world, society and healthcare, energy and solar cells, and composites. The exhibit at the Tallinn Digital Summit allowed the Graphene Flagship to show the important part Graphene will play in technological innovation for our digital future.

The related Graphene Flagship Press Release can be found here: https://graphene-flagship.eu/the-graphene-flagship-takes-technology-innovation-to-the-tallinn-digital-summit

High-bandwidth graphene photodetectors for high-speed optical communications

Graphene and related materials are ideal for optoelectronic components in integrated photonic devices, to be used in the next generation of communications systems. Chip-integrated electro-optic devices can significantly increase the performance of datalinks in terms of capacity, lower energy consumption and costs.

Continue reading “High-bandwidth graphene photodetectors for high-speed optical communications”

New graphene diode enables efficient microwave power detector

In cooperation with RWTH Aachen University and the University of Pisa, researchers from AMO realized the world first microwave power detector based on metal-insulator-graphene (MIG) diodes, which is able to perform power detection for frequency up to 50 GHz.

Diodes are key components for RF electronic devices, which are typically used at radio frequencies for signal reception, frequency multiplication, or energy harvesting applications. In recent years thin film technology based diodes, for example metal-insulator-metal (MIM) or MIG diodes, attract increasing interest because of their excellent performance along with the low series resistance which is a crucial benefit for high frequency operation. Such thin film diodes are already used in display applications and the thin film technology enables an unrestrained choice on the target application substrate, such as flexible foil.

image description

The MIG diodes presented in this work were fabricated at AMO using a thin film technology platform with CVD grown graphene and TiO2 deposited by atomic layer deposition. The MIG diodes show excellent static figures of merit significantly outperforming conventional MIMs. RF power detection based on the MIG diode is for the first time demonstrated in this work, showing a linear detection responsivity of 2.8 V/W at 2.4 GHz and 1.1 V/W at 50 GHz. These excellent DC and RF performance parameters make MIG diodes very promising for future application in thin-film technology and for 5G.

The work leading to these results was financially supported by the European Commission under the projects Graphene Flagship and SPINOGRAPH, and by the German Science Foundation (DFG) within the priority program 1796 FFlexCom.

Source: Mehrdad Shaygan, Zhenxing Wang, Mohamed Saeed Elsayed, Martin Otto, Giuseppe Iannaccone, Ahmed Hamed Ghareeb, Gianluca Fiori, Renato Negra, Daniel Neumaier
“High performance metal-insulator-graphene diodes for radio frequency power detection application”
Nanoscale, 2017, DOI: 10.1039/C7NR02793A

Kick-off for the Aachen Graphene & 2D-Materials Center

July 24th was the starting date for the Aachen Graphene & 2D-Materials Center, a joint research center of RWTH Aachen University and AMO GmbH. The Aachen Graphene & 2D-Materials Center integrates the already ongoing activities of several research groups at RWTH Aachen University and AMO GmbH in the fields of physics, material science and electrical engineering with the primary goal to efficiently bridge the gap between fundamental science and applications.

The mission of the Aachen Graphene & 2D-Materials Center is to exploit the unique properties of graphene, two-dimensional (2D) materials and 2D-heterostructures from a fundamental and applied point of view. The activities of the Center will address the challenges of future technology including high-frequency electronics, flexible electronics, energy-efficient sensing, photonics as well as spintronics and valleytronics, for which graphene and related 2D-materials have proven to be a unique enabling platform. Therefore, the center brings together the complementary expertise of Aachen’s world leading research groups and puts the Aachen Graphene & 2D-Materials Center in a leading position in Germany and Europe.

The founding members are Prof. Christoph Stampfer (RWTH and spokesman of the center), Prof. Max Lemme (AMO and RWTH), Prof. Markus Morgenstern (RWTH), Prof. Renato Negra (RWTH) and Dr. Daniel Neumaier (AMO) who are also active in the Flagship Project Graphene.

Founding members of the Aachen Graphene & 2D-Materials Center at the Kick-Off Meeting

Contact:
Prof. Christoph Stampfer
II. Physikalisches Institut der
RWTH Aachen University
Templergraben 55
52062 Aachen
Tel.: +49 241-8027055
Email.: info@graphene.ac