剑桥大学石墨烯中心的Tawfique Hasan博士来访

2015-10-10 16:13:54

报告题目:Two-dimensional Materials: The Route Toward Scalable Applications

报告人:Tawfique HasanCambridge Graphene Centre, University of Cambridge, Cambridge, UK

报告时间:1016日(星期五)下午1400

报告地点:物理科技楼409

报告摘要

Layered materials with a wide range of different photonic and optoelectronic properties represent an attractive proposition for flexible photonic and (opto)electronic devices. The most widely investigated layered material is graphene, which heralds the possibility of truly flexible and perhaps, transparent electronics. Other graphene-like layered nanomaterials, in particular, semiconducting transition metal dichalcogenides offer layer-dependent bandgaps, and hence, the possibility of (opto)electronic devices with conventional architecture. Together, graphene and related layered materials thus represent a family of nanomaterials attractive for next generation flexible (opto)electronic and photonic devices. For their large area applications, an economic approach is to use inks of these 2-dimensinoal materials. The functional inks, typically containing sub-micron flakes, can be formulated and deposited at room temperature, offer device fabrication and integration strategies through different processes, such as polymer composites, digital and lithographic printing as well as roll-to-roll (R2R) and spray coating over a large area.

I will briefly discuss inks and composite systems of various 2-dimensional layered materials and their printability towards applications. This will be followed by several (opto)electronic applications using graphene, the most established ink platform to date. I will discuss materials and technologies behind saturable absorbers for the generation of ultrafast lasers using graphene and transition metal dichalcogenides. I will also attempt to explain the potential mechanisms behind their saturable absorption from an engineer’s perspective. I will then move on to inkjet printed electrodes and devices, including CMOS integrated inkjet printed humidity sensors, hybrid nanomaterial transparent conductors and electrodes on a range of substrates for smart windows, electroluminescent devices and touchpads. I will also introduce our latest results on high speed printing of functional graphene inks on a commercial flexographic printer that could be the key to economic, disposable electronics and sensors on a wide variety of flexible substrates. I will conclude with a future vision in terms of technologies, devices and systems evolving from these materials.


报告人简介:

Dr Tawfique Hasan is a University Lecturer in Electronic Materials and Devices at the Cambridge Graphene Centre, Cambridge University Engineering Department. He is also the Director of the Master of Research (MRes) program in Graphene Technology and Deputy Director for Teaching and Training of the Centre for Doctoral Training in Graphene Technology. He gained his PhD in Electrical Engineering from the University of Cambridge in 2009. During his PhD, he worked on carbon nanotube solutions for ultrafast optical pulse generation. Prior to his PhD, he obtained his MEng. in Microelectronics from University of New South Wales, Australia and a BSc in Electrical and Electronic Engineering from Islamic University of Technology, Bangladesh.

Dr Hasan has held several research positions in the University since his PhD, including a prestigious Royal Academy of Engineering Research Fellowship to work on graphene based flexible and printable devices. This led to the foundation of Cambridge Graphene Limited.

Hasan’s current research focuses on formulation of functional 1- and 2-dimensional nanomaterial inks for a wide range of printable and flexible applications including ultrafast lasers, printable and flexible (opto)electronic, sensing and energy devices such as dye sensitized solar cells, supercapacitors and batteries. Hasan has over 50 research articles with ~6500 citations and an h-index of 27.

Dr Hasan is a Director of Studies in Engineering and a Title A Fellow in Churchill College, Cambridge.

Web: http://www-g.eng.cam.ac.uk/hasan/

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