Current research interests include (with links to publications)
1. Graphene and 2D Materials: band gap engineering, doping and characterization: We are studying the electronic, transport and doping of graphene and bilayer graphene in order to control the carrier concentration and induce an electronic and optical band gap. We also aim to understand charge transfer in the graphene - molecule system which is important for graphene molecular sensors.
2. Metallic nanoparticles for high frequency electronics and antennas: We are interested in high frequency electrical conduction and have explored the high frequency characterization, up to 220 GHz, of low temperature processed metal nanoparticles. We have shown, published in ACS Applied Materials in December 2012, that the high frequency electrical losses of screen printed mm-long coplanar waveguide structures of metallic nanoparticles are lower than that of conventional thick-film paste micron-sized silver grains. The improved response is due to the better packing and the smoother surface. AFM measurements show that silver nanoparticles have about 1/3 the rms roughness compared to the micron-sized silver grains. The use of metallic nanoparticles in this way may offer a route to efficient, flexible conformal antennas.
3. Carbon Nanotube Processing and CNT-Polymer Composites for Large Area Electronic Applications:
4. Current diamond-like carbon and carbon based electronics: We continue to work on examining the electronic and transport properties of DLC with collaborators at the Indian Institute of Technology, Delhi and the National Physical Laboratory, Delhi looking at
5. The structure, electrical transport and electronic properties of nanomaterials (with links to some papers) including
6. Rare Earth ion magnetic resonance (EPR) and Si optoelectronics: Previous projects included the first study of the EPR defects of Er3+ centres in oxygen co-implanted Si and the identification of the C1h monoclinic symmetry defect centre. We explored how the Er3+:O ratio and Er3+:F ratio affected the ESR and photoluminescence properties in Si. A variety of ESR active centres with monoclinic C1h point group symmetry and trigonal symmetry were found. This work was followed up by an examination of the validity of the cubic crystal field approximation for trigonal and tetragonal symmetry erbium 3+ centres.
7. Commercial applications of nanomaterials and societal impact Nanomaterials in general and carbon nanotubes and graphene, nanomaterials for high frequency applications in particular.
PhD positions are available to highly qualified candidates in all of the above areas, especially in graphene and high frequency characterisation of nanomaterials.
Current or recent lecture courses
1. Nanoelectronics and Devices (EEEM022) to MSc students (FHEQ 7).
2. Nanoscience and Nanotechnology (EEE3025) to year 3 undergraduate students (FHEQ 6).
3. Digital Engineering and Integrated Circuits (EEE2034) to year 2 undergraduate students (FHEQ 5)
Past modules include
1. Electronic Devices and Integrated Circuits (Year 2/FHEQ 5).
2. Introduction to Computer Logic (Year 1/FHEQ 4).
For a PhD position you will normally require a good Honours degree or MSc in Electronic Engineering, Physics or Materials. Current PhD positions include
1. Graphene electronics and band gap engineering: This project will use ab initio density functional theory to examine the electronic properties of graphene and related materials such as bilayer graphene in the presence of atoms and molecules. The project will examine how adsorption induces changes the carrier concentration (doping) of graphene and identify donor or acceptor behaviour; how the electronic and optical band gap depends on the type of species adsorbed and their concentration and how the electronic properties such band structure, density of states and transport properties change with adsorption.
2. Electronic and Structural Properties of 2D Nanomaterials: This project will use ab initio density functional theory to examine the electronic properties of 2D layered materials such as graphene, silicene, germanene, stanene and MoS2 and related materials. The project will calculate the electronic properties such band structure and the density of states and how they will change adsorption. The project will also examine the interaction between electrons and phonons in these materials.
3. Applications of Carbon Nanotube and Graphene Composites: This project aims to study the electronic properties of carbon nanotube (CNT) and graphene composite materials. The project will explore how the type and concentration of material and chemical functionalisation can change the electronic properties of the composite; how the high field electrical behaviour changes with nanotube volume fraction and how the electrical breakdown of the composite depends on the nanotube content.
See PhD project list here for more information. Both experimental and theoretical projects in the areas of graphene, bilayer graphene and other layered materials; high field and high frequency characterization of nanomaterials.
Here is a list of some recent research papers with links; a more complete list of peer-reviewed publications can be found via the Google Scholar website.
Nanotechnology and public perception and society. See, for example, presentation and round table discussion on Developments in Nanotechnology and Contemporary International Intervention in July 2012.
Nanomaterials for High Frequency Electronics: See our press release on high frequency (up to 220 GHz) applications of carbon nanotube polymer composites, published in Applied Physics Letters in October 2011, and showed low electrical losses (0.15 dB/mm) are possible in electrical conductors made from CNT-PMMA composites up to 25 mm in length.
Carbon Nanotube Polymer Displays: Our study of field emission from CNT-polymer composites, published in Small in 2009, has attracted considerable attention e.g. see Azonono.com and Nanotechwire.com as it highlights the importance of chemical functionalisation for efficient nanotube dispersion to minimize material wastage while retaining excellent electrical characteristics. Its impact is seen in several of areas of carbon nanotube engineering, including composite manufacture, large area transparent conductors and displays.
Radio Interview on Nanoscience and Nanotechnology: Check out a radio interview I did on nanotechnology and nanomaterials for The Naked Scientists.
Alex Samuels (2013), Molecular Doping of Graphene based Materials
Ali Alshehri (2013), Nanomaterials for rf and sub-THz Applications
Gemma Kerr (2008), Nanomanipulation and In-Situ Electrical Characterisation of Nanowires
V Samuthiravel, Introduction of a band-gap in bilayer graphene by the applications of an electric field
M W Iqbal, Current through network of carbon nanotubes for transparent electronics
Y-C Chang, The electronic properties of graphene
H Khalil, Carbon nanotube composite cathodes
N Roome, Charge transfer in graphene for sensing applications
S Babar, Transport in Ballistic Transistors
T Connolly, Carbon nanotube interaction with gas molecules
V Devendran, Electrical characterization of nanowires and related materials
A Garcia Gurddon, Electrical characterization of Carbon Nanomaterials
C Price, A DFT study of CO dissociation on transition metals platinum, palladium and gold
B Patel, Pattern formation in low dimensions
S Sayid, Modelling of low dimensional devices
C S Soon, Polydimethylsiloxane encapsulation of organic solar cells
N Woolger, Growth and Characterisation of Carbon Nanotube related Materials Produced by Arc Discharge
G Douglas, Order and disorder in cellular networks
G Grigoriadis, Local environment effects for ions in materials
K Pigiotis, Calculating energy levels in materials
S Tziortzis, Nanotechnology and cellular networks
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Page Created: Friday 25 June 2010 15:50:39 by lb0014
Last Modified: Monday 13 January 2014 16:13:54 by ees2dc
Expiry Date: Sunday 25 September 2011 14:24:49
Assembly date: Wed Apr 16 17:32:17 BST 2014
Content ID: 30199