Imperial College London

Professor David W. McComb

Faculty of EngineeringDepartment of Materials

Adjunct Professor
 
 
 
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Contact

 

+44 (0)20 7594 6750d.mccomb Website

 
 
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Location

 

Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

293 results found

Taub S, Williams REA, Wang X, McComb DW, Kilner JA, Atkinson Aet al., 2014, The effects of transition metal oxide doping on the sintering of cerium gadolinium oxide, ACTA MATERIALIA, Vol: 81, Pages: 128-140, ISSN: 1359-6454

Journal article

Gilchrist JB, Basey-Fisher TH, Chang SC, Scheltens F, McComb DW, Heutz Set al., 2014, Uncovering buried structure and interfaces in molecular photovoltaics, Advanced Functional Materials, Vol: 24, Pages: 6473-6483, ISSN: 1616-301X

The processes that generate current in organic photovoltaics are highly dependent on the micro‐ and nano‐structure in the semiconductor layers, especially at the donor‐acceptor interface. Elucidating film properties throughout the thickness of the devices is therefore key to their further development. Here, a methodology is developed to gain unprecedented insights into the structure and composition of the molecular layers within the depth of device structure using high resolution transmission electron microscopy (HRTEM). The technique was applied to three archetypical solar cell configurations consisting of copper phthalocyanine (CuPc) and C60, which have been cross‐sectioned using a focused ion beam method optimized to minimize sample damage. The HRTEM images exhibit lattice fringes in both CuPc and C60, confirming the crystallinity and texture of both materials, and offering novel insight into the growth of C60 onto molecular materials. The donor‐acceptor interface morphology is further studied using scanning transmission electron microscopy (STEM) in combination with energy dispersive X‐ray (EDX) spectroscopy, extending the scope of our methodology to amorphous heterostructures.

Journal article

Channagiri SA, Viswanathan GB, Nichol R, Nagpure SC, McComb DWet al., 2014, Spatially resolved characterization of phases in LiFePO<inf>4</inf> battery cathodes using low loss electron energy-loss spectroscopy, Pages: 432-433, ISSN: 1431-9276

Conference paper

Yang F, Chen Y, Cai Z, Tsvetkov N, Burriel M, Tellez H, Yildiz B, Kilner JA, Williams DB, McComb DWet al., 2014, High resolution electron microscopy characterization of (La<inf>0.5</inf>Sr<inf>0.5</inf>)<inf>2</inf>CoC<inf>4</inf> thin film cathode materials, Pages: 1912-1913, ISSN: 1431-9276

Conference paper

Meyer TL, Dixit M, Williams REA, Susner MA, Fraser HL, McComb DW, Sumption MD, Lemberger TR, Woodward PMet al., 2014, Cation non-stoichiometry in pulsed laser deposited Sr2+yFe1+xMo1-xO6 epitaxial films, JOURNAL OF APPLIED PHYSICS, Vol: 116, ISSN: 0021-8979

Journal article

Nicholls RJ, Ni N, Lozano-Perez S, London A, McComb DW, Nellist PD, Grovenor CRM, Pickard CJ, Yates JRet al., 2014, Crystal Structure of the ZrO Phase at Zirconium/Zirconium Oxide Interfaces, Advanced Engineering Materials, Vol: 17, Pages: 211-215, ISSN: 1527-2648

Zirconium-based alloys are used in water-cooled nuclear reactors for both nuclear fuel cladding and structural components. Under this harsh environment, the main factor limiting the service life of zirconium cladding, and hence fuel burn-up efficiency, is water corrosion. This oxidation process has recently been linked to the presence of a sub-oxide phase with well-defined composition but unknown structure at the metal–oxide interface. In this paper, the combination of first-principles materials modeling and high-resolution electron microscopy is used to identify the structure of this sub-oxide phase, bringing us a step closer to developing strategies to mitigate aqueous oxidation in Zr alloys and prolong the operational lifetime of commercial fuel cladding alloys.

Journal article

Petrov PK, Zou B, Wang Y, Perkins JM, McComb DW, Alford NMet al., 2014, STO/BTO Modulated Superlattice Multilayer Structures with Atomically Sharp Interfaces, ADVANCED MATERIALS INTERFACES, Vol: 1, ISSN: 2196-7350

Journal article

Goode AE, Hine NDM, Chen S, Bergin SD, Shaffer MSP, Ryan MP, Haynes PD, Porter AE, McComb DWet al., Mapping functional groups on oxidised multi-walled carbon nanotubes at the nanometre scale, Chemical Communications, ISSN: 1364-548X

Journal article

Alexander JA, Durstock MF, Tabor CE, Leever BJ, Drummy LF, Clark MD, Butcher DP, Scheltens FJ, McComb DWet al., 2014, Investigation of the use of stereo-pair data sets in electron tomography characterization of organic-based solar cells, Pages: 550-551, ISSN: 1431-9276

Conference paper

Deitz J, Carnevale S, De Graef M, Picard YN, Ringel SA, Grassman T, McComb DWet al., 2014, Using electron channeling contrast imaging for misfit dislocation characterization in heteroepitaxial III-V/Si thin films, Pages: 552-553, ISSN: 1431-9276

Conference paper

Scheltens FJ, Durstock MF, Tabor CE, Leever BJ, Drummy LF, Clark MD, Butcher DP, Alexander JA, McComb DWet al., 2014, Monochromated electron energy-loss spectroscopy spectrum imaging of organic photovoltaic devices, Pages: 400-401, ISSN: 1431-9276

Conference paper

Esser BD, D'Alfonso AJ, Dixit M, Williams REA, Fraser HL, Allen LJ, McComb DWet al., 2014, Understanding B-site disorder in HAADF-STEM images of double perovskite thin films using the quantum excitation of phonons model, Pages: 184-185, ISSN: 1431-9276

Conference paper

Deng B, Freria CM, Williams REA, Huber D, Sosa J, Popovich PG, McComb DWet al., 2014, 3D visualization of motor-neurons in mice spinal cord using FIB\SEM tomography, Pages: 1400-1401, ISSN: 1431-9276

Conference paper

Colijn HO, Yang F, Williams DB, Sandborg A, McComb DWet al., 2014, Performance of an improved TEM SDD detector, Pages: 608-609, ISSN: 1431-9276

Conference paper

Williams REA, Carnevale SD, Kent TF, Stowe DJ, Myers RC, McComb DWet al., 2014, Electron energy loss spectroscopy and localized cathodoluminescence characterization of GaN quantum discs, Pages: 578-579, ISSN: 1431-9276

Conference paper

Goode AE, Hine NDM, Chen S, Bergin SD, Shaffer MSP, Ryan MP, Haynes PD, Porter AE, McComb DWet al., 2014, Mapping functional groups on oxidised multiwalled carbon nanotubes at the nanometre scale, CHEMICAL COMMUNICATIONS, Vol: 50, Pages: 6744-6747, ISSN: 1359-7345

Journal article

Klosowski M, Porter AE, Shefelbine SJ, McComb DWet al., 2014, Analytical electron microscopy of bone and mineralized tissue, Handbook of Imaging in Biological Mechanics, Pages: 491-505, ISBN: 9781466588134

© 2015 by Taylor & Francis Group, LLC. In this chapter, the use of transmission electron microscopy (TEM) techniques for investigation of mineralized tissues is reviewed. The high-resolution imaging capabilities of modern TEM instruments are yielding new insights into the nanostructure of materials such as bone and dentine that improve our understanding of the complex multiscale structures. Analytical techniques such as electron energy-loss spectroscopy and energy dispersive x-ray analysis in the TEM are providing insights into chemistry and bonding in mineralized tissues with molecular-scale spatial resolution. Dual beam focused ion beam instruments have revolutionized sample preparation; TEM samples can be prepared from site-specific regions of interest such as cracks and interfaces. In combination, these methods can shed light on the exact relationship between the mineral and organic phases in mineralized tissues and ultimately provide unique insights in the complex relationship between chemistry, structure, and bonding with bone-related pathologies.

Book chapter

Goode AE, Hine NDM, Chen S, Bergin SD, Motskin M, Gonzalez Carter DA, Dexter DT, Shaffer MSP, Ryan MP, Haynes PD, Porter AE, McComb DWet al., 2014, Electron microscopic characterization of functionalized multi-walled carbon nanotubes and their interactions with the blood brain barrier, Pages: 1744-1745, ISSN: 1431-9276

Conference paper

Yang F, Scheltens F, McComb D, Williams DB, De Graef Met al., 2014, Absorption corrections for a four-quadrant superX EDS detector, Pages: 100-101, ISSN: 1431-9276

Conference paper

Lucy JM, Hauser AJ, Wang HL, Soliz JR, Dixit M, Williams REA, Holcombe A, Morris P, Fraser HL, McComb DW, Woodward PM, Yang FYet al., 2013, Buffer-layer enhanced structural and electronic quality in ferrimagnetic Sr2CrReO6 epitaxial films, APPLIED PHYSICS LETTERS, Vol: 103, ISSN: 0003-6951

Journal article

Pishbin F, Mourino V, Gilchrist JB, McComb DW, Kreppel S, Salih V, Ryan MP, Boccaccini ARet al., 2013, Single-step electrochemical deposition of antimicrobial orthopaedic coatings based on a bioactive glass/chitosan/nano-silver composite system, ACTA BIOMATERIALIA, Vol: 9, Pages: 7469-7479, ISSN: 1742-7061

Journal article

Boonrungsiman S, Fearn S, Gentleman E, Spillane L, Carzaniga R, McComb DW, Stevens MM, Porter AEet al., 2013, Correlative spectroscopy of silicates in mineralised nodules formed from osteoblasts, Nanoscale, Vol: 5, Pages: 7544-7551, ISSN: 2040-3372

Silicon supplementation has been shown to play an important role in skeleton development, however, the potential role that silicon plays in mediating bone formation, and an understanding of where it might localise in the resulting bone tissue remain elusive. An improved understanding of these processes could have important implications for treating pathological mineralisation. A key aspect of defining the role of silicon in bone is to characterise its distribution and coordination environment, however, there is currently almost no information available on either. We have combined a sample-preparation method that simultaneously preserved mineral, ions, and the extracellular matrix (ECM) with secondary ion mass spectroscopy (SIMS) and electron energy-loss spectroscopy (EELS) to examine the distribution and coordination environment of silicon in murine osteoblasts (OBs) in an in vitro model of bone formation. SIMS analysis showed a high level of surface contamination from polydimethysiloxane (PDMS) resulting from sample preparation. When the PDMS was removed, silicon compounds could not be detected within the nodules either by SIMS or by energy dispersive X-ray spectroscopy (EDX) analysis. In comparison, electron energy-loss spectroscopy (EELS) provided a powerful and potentially widely applicable means to define the coordination environment and localisation of silicon in mineralising tissues. We show that trace levels of silicon were only detectable from the mineral deposits located on the collagen and in the peripheral region of mineralised matrix, possibly the newly mineralised regions of the OB nodules. Taken together our results suggest that silicon plays a biological role in bone formation, however, the precise mechanism by which silicon exerts its physicochemical effects remains uncertain. Our analytical results open the door for compelling new sets of EELS experiments that can provide detailed and specific information about the role that silicates play in bone

Journal article

Menzel R, Duerrbeck A, Liberti E, Yau HC, McComb D, Shaffer MSPet al., 2013, Determining the Morphology and Photocatalytic Activity of Two-Dimensional Anatase Nanoplatelets Using Reagent Stoichiometry, CHEMISTRY OF MATERIALS, Vol: 25, Pages: 2137-2145, ISSN: 0897-4756

Journal article

Xie H-N, Larmour IA, Chen Y-C, Wark AW, Tileli V, McComb DW, Faulds K, Graham Det al., 2013, Synthesis and NIR optical properties of hollow gold nanospheres with LSPR greater than one micrometer, NANOSCALE, Vol: 5, Pages: 765-771, ISSN: 2040-3364

Journal article

Cecchini MP, Wiener A, Turek V, Chon H, Lee S, Ivanov AP, McComb DW, Choo J, Albrecht T, Maier SA, otherset al., 2013, Rapid Ultra-Sensitive Single Particle Surface Enhanced Raman Spectroscopy using Metallic Nanopores, Nano Letters

Journal article

McGilvery CM, De Gendt S, Payzant EA, MacKenzie M, Craven AJ, McComb DWet al., 2012, Investigation of Crystallization Processes from Hafnium Silicate Powders Prepared from an Oxychloride Sol-Gel, JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Vol: 95, Pages: 3985-3991, ISSN: 0002-7820

Journal article

Boonrungsiman S, Gentleman E, Carzaniga R, Evans ND, McComb DW, Porter AE, Stevens MMet al., 2012, The role of intracellular calcium phosphate in osteoblast-mediated bone apatite formation, PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, Vol: 109, Pages: 14170-14175, ISSN: 0027-8424

Journal article

Forbes BD, D'Alfonso AJ, Williams REA, Srinivasan R, Fraser HL, McComb DW, Freitag B, Klenov DO, Allen LJet al., 2012, Contribution of thermally scattered electrons to atomic resolution elemental maps, PHYSICAL REVIEW B, Vol: 86, ISSN: 1098-0121

Journal article

McGuire E EC, Motskin M, Bolognesi B, Bergin SD, Knowles TPF, Skepper J, Luheshi LM, McComb DW, Dobson CM, Porter AEet al., 2012, Selenium-Enhanced Electron Microscopic Imaging of Different Aggregate Forms of a Segment of the Amyloid β Peptide in Cells, ACS Nano

The aggregation of misfolded proteins is a common feature underlying a wide range of age-related degenerative disorders, including Alzheimer's and Parkinson's diseases. A key aspect of understanding the molecular origins of these conditions is to define the manner in which specific types of protein aggregates influencedisease pathogenesis through their interactions with cells. We demonstrate how selenium enhancedelectron microscopy (SE-EM), combined with tomographic reconstruction methods, can be used to image, here at a resolution of 5 10 nm, the interaction with human macrophage cells of amyloid aggregates formed from Aβ25 36, a fragment of the Aβ peptide whose self-assembly is associated with Alzheimer's disease. We find that prefibrillaraggregates and mature fibrils are distributed into distinct subcellular compartments andundergo varying degrees of morphological change over time, observations that shed new lighton the origins of their differential toxicity and the mechanisms of their clearance. In addition, the results show that SE-EM provides a powerful and potentially widely applicable means to define the nature and location of protein assemblies in situ and to provide detailed and specific information about their partitioning and processing.

Journal article

Li W, Fenton JC, Cui A, Wang H, Wang Y, Gu C, McComb DW, Warburton PAet al., 2012, Felling of individual freestanding nanoobjects using focused-ion-beam milling for investigations of structural and transport properties, NANOTECHNOLOGY, Vol: 23, ISSN: 0957-4484

Journal article

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