Monochromated Transmission Electron Microscopy

Lead Research Organisation: Imperial College London
Department Name: Materials

Abstract

At Imperial College London and the London Centre for Nanotechnology we installed an electron microscope in 2006 which is unique in the UK and is one of only a few in the world. This microscope allows materials to be characterised by imaging and spectroscopic methods with a combined energy and spatial resolution that is world-leading. Access to such an instrument will allow researchers working in the field of nanotechnology to better understand the factors that influence the performance and characteristics of their new materials and devices. While the instrument is heavily used for research projects in the LCN we feel it would be worthwhile to make some time available on this state-of-the-art facility for researchers in other academic institutions to investigate their materials using this facility. In addition to providing access we will support these external users through technical support, training and data interpretation. We are seeking funds to allow us to provide this external access.
 
Description At Imperial College London and the London Centre for Nanotechnology we installed an electron microscope in 2006 which is unique in the UK and is one of only a few in the world. This microscope allows materials to be characterised by imaging and spectroscopic methods with a combined energy and spatial resolution that is world-leading. Access to such an instrument will allow researchers working in the field of nanotechnology to better understand the factors that influence the performance and characteristics of their new materials and devices. While the instrument is heavily used for research projects in the LCN we feel it would be worthwhile to make some time available on this state-of-the-art facility for researchers in other academic institutions to investigate their materials using this facility. In addition to providing access we will support these external users through technical support, training and data interpretation.
First Year Of Impact 2013
Sector Manufacturing, including Industrial Biotechology
Impact Types Economic

 
Description Multiwall Carbon Nanotube (MWCNT) Encapsulated Iron Nanowires 
Organisation Queen Mary University of London
Country United Kingdom 
Sector Academic/University 
PI Contribution The ultimate goal for these materials is to create extremely anisotropic nano-sized magnets for use individually as magnetic probe tips, and for use in arrays as very high density data storage media. Synthesis and characterisation of Fe-filled MWCNTs was undertaken by a PhD student at Queen Mary. Previous characterisation of Fe-filled multi-walled carbon nanotubes provided firm evidence that some MWCNTs contain Fe-metal or Fe-carbide phases with large lattice spacings not corresponding to known crystal structures. The confinement of the Fe core by highly elastic MWNT (elastic modulus ~1 TPa) results in crystalline phases, phase transformations, and magnetic phenomena significantly different from those of bulk material. There is a high expectation of new or unknown phases owing to core confinement and possibly MWNT/core commensurability. The Fe:C ratio for the unknown phase was measured using high resolution, quantitative EELS measurements on a cross-section of the Fe-filled MWCNT.
Start Year 2011
 
Description Multiwall Carbon Nanotube (MWCNT) Encapsulated Iron Nanowires 
Organisation Queen Mary University of London
Country United Kingdom 
Sector Academic/University 
PI Contribution The ultimate goal for these materials is to create extremely anisotropic nano-sized magnets for use individually as magnetic probe tips, and for use in arrays as very high density data storage media. Synthesis and characterisation of Fe-filled MWCNTs was undertaken by a PhD student at Queen Mary. Previous characterisation of Fe-filled multi-walled carbon nanotubes provided firm evidence that some MWCNTs contain Fe-metal or Fe-carbide phases with large lattice spacings not corresponding to known crystal structures. The confinement of the Fe core by highly elastic MWNT (elastic modulus ~1 TPa) results in crystalline phases, phase transformations, and magnetic phenomena significantly different from those of bulk material. There is a high expectation of new or unknown phases owing to core confinement and possibly MWNT/core commensurability. The Fe:C ratio for the unknown phase was measured using high resolution, quantitative EELS measurements on a cross-section of the Fe-filled MWCNT.
 
Description Prof. Marty Gregg, Queens University, Belfast. Microscopy at the Ferroelectric-Electrode Interface 
Organisation Queen's University Belfast
Country United Kingdom 
Sector Academic/University 
PI Contribution Prof. Marty Gregg, Queens University, Belfast. The form of the permittivity fall-off observed in dielectric thin films is such that a parasitic low permittivity region, or ?dead layer? exists, acting electrically in series with a particular dielectric film. Series behaviour implied that that the dead-layer originated at the electrode-dielectric interface though beyond this supposition, little is known about the origin, nature and location of the dead layer. This is in spite of recent surges of interest in the use of thin high-permittivity layers as substitutes for silicon oxide in gate dielectrics and DRAM devices. The key emphasis of the importance of the nature of the single bond across the dielectric-metal interface demands further investigation, which is the purpose of the proposed Titan microscopy.
Start Year 2011
 
Description Selenium enhanced microscopic imaging of amyloid beta aggregates inside cells 
Organisation University of Cambridge
Country United Kingdom 
Sector Academic/University 
PI Contribution The aim of this project was to develop a methodology to image amyloid beta - the peptide associated with Alzheimers disease, inside cells. We have demonstrated how selenium enhanced electron microscopy (SE-EM), combined with tomographic reconstruction methods, can be used to image, here at a resolution of 5-10 nanometres, the interaction of amyloid aggregates formed from a fragment of the Alzheimer?s-related A_ peptide, A_25-36, with human macrophage cells.
Start Year 2011
 
Description [S]TEM Imaging of Silica Tubes 
Organisation National Physical Laboratory
Country United Kingdom 
Sector Academic/University 
PI Contribution Initiated a collaboration with NPL on silica tubes synthesised a protein template. Collabroators Vaso Tsileli. Anaysis (EDX and HRTEM) of silica nanotubes produced using a protein templating method at the NPL. One day of work.
Start Year 2013