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![]() | Dr Jamie Warner |
Summary of Interests
The design, synthesis, characterization and understanding of novel nanostructured materials. I am interested in the unique properties that arise in materials when they are made very small. This involves carbon based nanomaterials such as fullerenes, metallofullerenes, single-walled carbon nanotubes, multi-walled carbon nanotubes, peapods and graphene. Also, semiconductor nanocrystals (Si, Ge, PbS, PbSe, CdS, CdSe, ZnS, and TiO2) that are produced using solution phase chemistry. Synthesis of graphene using chemical vapour deposition methods is also investigated. The characterization of the nanomaterials is performed primarily using high resolution transmission electron microscopy, optical spectroscopy, electron diffraction and electron spin resonance. Applications involve quantum information processing, nanoelectronics, spintronics, opto-electronics, and photo-catalysis.
Research Publications
106. J. Luo, W. Ouyang, X. Li, Z. Jin, L. Yang, C. Chen, J. Zhang, Y. Li, J. H. Warner, L-M. Peng, Q. Zheng, J. Zhu, Pointwise Plucking of Suspended Carbon Nanotubes. Nano Letters, 12, 3363-3367 (2012).
105. C. S. Allen, A. R. Robertson, A. I. Kirkland, J. H. Warner, The Identification of Inner Tube Defects in Double-Wall Carbon Nanotubes, Small, Accepted 2012
104. J. H. Warner, E. R. Margine, M. Mukai, A. W. Robertson, F. Giustino, A. I. Kirkland, Dislocation Driven Deformations in Graphene. Science, 337, 209 (2012).
103. L. D. Nyamen, V. S. R. R. Pullabhotla, A. A. Nejo, P. T. Ndifon, J. H. Warner, N. Revaprasadu, Synthesis of anisotropic PbS nanoparticles using heterocyclic dithiocarbamate complexes. Dalton Transactions, 41, 8297-8302, (2012)
102. J. H. Warner, M. Mukai, A. I. Kirkland. The Atomic Structure of ABC Rhombohedral Stacked Trilayer Graphene. ACS Nano, 6, 5680-5686, (2012)
101. M. J. Holmes, Y. S. Parks, X. Wang, C. C. S. Chan, B. P. L. Reid, H. Kim, J. Luo, J. H. Warner, R. A. Taylor, Optical Studies of GaN nanocolumns containing InGaN quantum disks and the effect of strain relaxation on the carrier distribution. Phys. Stat. Sol. C. 9, 712-714 (2012)
100. M. Fouquet, B. C. Bayer, S. Esconjaurequi, R. Blume, J. H. Warner, S. Hofmann, R. Schlogl, C. Thomsen, J. Robertson, Highly chiral-selective growth of single-walled carbon nanotubes with a simple monometallic Co catalyst. Phys. Rev. B. 85, 235411 (2012)
99. Y. Wu, Y. Fan, S. Speller, G. Creeth, J. Sadowski, K. He, A. W. Robertson, C. Allen, J. H. Warner. Large Single Crystals of Graphene on Melted Copper using Chemical Vapour Deposition. ACS Nano 6, 5010-5017, (2012).
98. J. Moghul, Y. Wu, J. H. Warner, Mechanical Response of Few-Layer Graphene Films on Copper. Scripta Materialia, 67, 273-276, (2012)
97. G.Zhong, J. H. Warner, M. Fouquet, A. W. Robertson, B. Chen, J. Robertson, Growth of Ultrahigh Density Single-Walled Carbon Nanotube Forests by Improved Catalyst Design, ACS Nano, 6, 2893-2903 (2012)
96. I. Ibrahim, A. Bachmatiuk, J. H. Warner, B. Büchner, G. Cuniberti, M. H. Rümmeli, CVD grown horizontally aligned single wall carbon nanotubes: Synthesis routes and growth mechanisms. Small 8, 1973-1992 (2012)
95. B. Li, H. Cao, J. Yin, Y. A. Wu, J. H. Warner, Synthesis and separation of dyes via Ni@reduced graphene oxide nanostructures. Journal of Materials Chemistry, 22, 1876-1883, (2012)
94. A. Wongariyakawee, F. Schaeffel, J. H. Warner, D. O’Hare, Surfactant directed synthesis of calcium aluminium layered double hydroxides nanoplatelets. Journal of Materials Chemistry, 22, 7751-7756, (2012)
93. H. Cao, X. Wu, G. Yin, J. H. Warner, Synthesis of Adenine Modified Reduced Graphene Oxide Nanosheets. Inorganic Chemistry, 51, 295-2960 (2012)
92. M.T. Cole, K. Hou, J.H. Warner, J.S. Barnard, K. Ying, Y. Zhang, C. Li, K.B.K. Teo, W.I. Milne, In-situ deposition of sparse vertically aligned carbon nanofibres on catalytically activated stainless steel mesh for field emission applications. Diamond & Related Materials, 23, 66-71,(2012)
91. Y. A. Wu, J. H. Warner, Shape and Property Control of Mn Doped ZnSe Quantum Dots: From Branched to Spherical. Journal of Materials Chemistry, 22, 417-424, (2012).
90. Y. S. Chaudhary, T. W. Woolerton, C. S. Allen, J. H. Warner, E. Pierce, S. W. Ragsdale, F. A. Armstrong. Visible Light-Driven CO2 Reduction by Enzyme Coupled CdS Nanocrystals. Chemical Communications, 48, 58-60, (2012)
89. A. W. Robertson, A. Bachmatiuk, Y. A. Wu, F. Schaeffel, B. Buechner, M. Ruemelli, J. H. Warner, Structural Distortions in Few Layer Graphene from Creases, ACS Nano, 5, 9984-9991, (2011)
88. C. S. Allen, Y. Ito, A. W. Robertson, H. Shinohara, J. H. Warner, Two-Dimensional Coalescence Dynamics of Encapsulated Metallofullerenes in Carbon Nanotubes. ACS Nano, 5, 10084-10089 (2011).
87. F. Schaeffel, M. Wilson, J. H. Warner, Motion of Light Adatoms and Molecules on the Surface of Few-Layer Graphene. ACS Nano, 5, 9428-9441, (2011)
86. J. H. Warner, N. P. Young, A. I. Kirkland, G. A. D. Briggs, Resolving Strain in Carbon Nanotubes at the Atomic Level, Nature Materials, 10, 958-962, (2011)
85. Y. A. Wu, A. W. Robertson, F. Shaeffel, S. C. Speller, J. H. Warner, Aligned Rectangular Few-Layer Graphene Domains on Copper Surfaces, Chemistry of Materials, 23, 4543-4547, (2011).
84. A. W. Robertson, A. Bachmatiuk, Y. A. Wu, F. Schaffel, B. Rellinghaus, B. Buchner, M. H. Rummeli, J. H. Warner, Atomic Structure of Interconnected Few Layer Graphene Domains, ACS Nano, 5, 6610–6618, (2011)
83. I. Ibrahim, A. Bachmatiuk, F. Borrnert, J. Bluher, U. Wolff, J. H. Warner, B. Buchner, C. Cuniberti, M. H. Rummeli. Optimizing substrate surface and catalyst conditions for high yield chemical vapor deposition grown epitaxially aligned single-walled carbon nanotubes, Carbon 49, 5029-5037 (2011)
82. M. J. Holmes, Y. S. Park, X. Wang, C. C. S. Chan, B. P. L. Reid, H. Kim, R. A. Taylor, J. H. Warner, J. Luo, Optical studies on a single GaN nanocolumn containing a single InxGa1-xN quantum disk, Applied Physics Letters, 98, 251908 (2011)
81. E. J. Lawrence, G. G. Wildgoose, L. Aldous, Y. A. Wu, J. H. Warner, R. G. Compton, 3-Aryl-3-(trifluoromethyl)diazirines as versatile photoactivated "linker" molecules for the improved covalent modification of graphitic and carbon nanotube surfaces, Chemistry of Materials , 23, 3740–3751 (2011)
80. H. Wang, J. Luo, F. Schaeffel, M. Ruemmeli, G. A. D. Briggs, J. H. Warner, Carbon Nanoelectronic Devices Compatible with Transmission Electron Microscopy. Nanotechnology, 22, 245305 (2011)
79. Y. A. Wu, A. Kirkland, F. Schaeffel, K. Porfyrakis, N. P. Young, G. A. D. Briggs, J. H. Warner. Utilizing Boron Nitride Sheets as thin supports for high resolution imaging of nanocrystals. Nanotechnology, 22, 195603 (2011)
78. A. Robertson, J. H. Warner, Hexagonal single crystal domains of few layer graphene on copper foils. Nano Letters. 11, 1182-1189 (2011)
77. A. Scott, A. Dianat, F. Borrnert, A. Bachmatiuk, S. Zhang, J. H. Warner, E. Borowiak-Palen, M. Knupfer, B. Buchner, G. Cuniberti, M. H. Rummeli, The catalytic potential of high k dielectrics for graphene formation. Applied Physics Letters. 98, 073110 (2011)
76. F. Shaeffel, M. Wilson, A. Bachmatiuk, M. Rummeli, U. Queitsch, B. Rellinghaus, G. A. D. Briggs, J. H. Warner, Atomic Resolution Imaging of the Edges of Catalytically Etched Suspended Few Layer Graphene. ACS Nano 5, 1975-1983, (2011)
75. B. Li, H. Cao, J. Shao, M. Qu, J. H. Warner, Superparamagnetic Fe3O4 Nanocrystals@Graphene Composites for Energy Storage Devices. Journal of Materials Chemistry. 21, 5069-5075 (2011)
74. J. Luo, P. Tian, C-T. Pan, A. Robertson, J. H. Warner, E. Hill, G. A. D. Briggs. Ultralow Secondary Electron Emission of Graphene. ACS Nano 5, 1047-1055, (2011)
73. J. H. Warner, S. Plant, N. P. Young, K. Porfyrakis, A. Kirkland, G. A. D. Briggs, Atomic Scale Growth Dynamics of Nanocrystals within Nanotubes. ACS Nano, 5, 1410-1417 (2011)
- Featured as a ‘Research Highlight’, Nanoscience: Glimpses of Crystal Growth, Nature, 470, 142 (2011)
72. J. K. Sprafke, S. D. Stranks. J. H. Warner, R. J. Nicholas, H. L. Anderson, Noncovalent Binding of Carbon Nanotubes by Porphyrin Oligomers. Angewandte Chemie International Edition, 50, 2313-2316 (2011)
71. C. J. Wang, Y. A. Wu, R. M. J. Jacobs, J. H. Warner, G. R. Williams, D. O’Hare, Reverse Micelle Synthesis of Co-Al LDHs: Control of Particle Size and Magnetic Properties. Chemistry of Materials. 23, 171-180, (2011).
70. M. Zaka, Y. Ito, H. Wang, W. Yan, A. Robertson, Y. A. Wu, M. H. Rummeli, D. Staunton, T. Hashimoto, J. J. L. Morton, A. Ardavan, G. A. D. Briggs, J. H. Warner, Electron paramagnetic resonance investigations of purified catalyst-free single-walled carbon nanotubes. ACS Nano, 4, 7708-7716 (2010)
69. H. Wang, J. Luo, A. Robertson, Y. Ito, W. Yan, V. Lang, M. Zaka, F. Schaffel, M. H. Rummeli, G. A. D. Briggs, J. H. Warner. High performance field effect transistors from solution processed carbon nanotubes. ACS Nano, 4, 6659-6664 (2010)
68. F. Schaffel, J. H. Warner, A. Bachmatiuk, U. Queitsch, B. Rellinghaus, B. Buchner, L. Schultz, M. H. Rummeli, Tracking down the catalytic hydrogenation of multilayer graphene. Physica Status Solid C. 7, 2731-2734 (2010)
67. S. Gorantla, F. Borrnert, A. Bachmatiuk, M. Dimitrakopoulou, R. Schonfelder, F. Schaffel, J. Thomas, T. Gemming, J. H. Warner, B. I. Yakobson, J. Eckert, B. Buchner, M. H. Rummeli, In-situ observations of fullerene fusion and endocytotic entry into carbon nanotubes. Nanoscale 2, 2077-2079, (2010)
66. J. H. Warner, M. H. Rummeli, A. Bachmatiuk, B. Buchner, Examining the stability of folded graphene edges against electron beam induced sputtering with atomic resolution. Nanotechnology 21, 325702 (2010)
65. M. H. Rummeli, A. Bachmatiuk, A. Scott, F. Borrnert, J. H. Warner, V. Hoffman, J-H. Lin, G. Cuniberti, B. Buechner, Direct Low Temperature Nano-Graphene Synthesis over a Dielectric Insulator. ACS Nano, 4, 4206-4210 (2010)
64. J. H. Warner, M. Wilson, Elastic distortions of carbon nanotubes induced by chiral fullerene chains. ACS Nano, 4, 4011-4016, (2010)
63. R. M. Brown, Y. Ito, J. H. Warner, A. Ardavan, H. Shinohara, G. A. D. Briggs, J. J. L. Morton, Spin coherence times of metallofullerenes: Y, Sc, La@C82. Physical Review B, 82, 033410 (2010)
62. R. J. Nicholls, K. Sader, J. H. Warner, S. R. Plant, K. Porfyrakis, P. D. Nellist, G. A. D. Briggs, D. J. H. Cockayne, Direct imaging and chemical identification of the encapsulated metal atoms in bimetallic endofullerene peapods. ACS Nano, 4, 3943-3948 (2010)
61. A. Bachmatiuk, F. Borrnert, F. Schaeffel, M. Zaka, G. S. Martynkowa, D. Placha, R. Schoenfelder, P. M. F. J. Costa, N. Ioannides, J. H. Warner, R. Klingeler, B. Buchner, M. H. Rummeli, The formation of stacked-cup carbon nanotubes using chemical vapour deposition from ethanol over silica. Carbon, 48, 3175-3181 (2010)
60. J. H. Warner, The influence of the number of layers of graphene on the atomic resolution images obtained from aberration-corrected high resolution transmission electron microscopy. Nanotechnology, 21, 255707 (2010)
59. J. Luo, J. H. Warner, C. Feng, Y. Yao, Z. Jin, H. Wang, C. Pan, S. Wang, L. Yang, Y. Li, J. Zhang, A. A. R. Watt, L. Peng, J. Zhu, G. A. D. Briggs, Ultrahigh secondary electron emission of carbon nanotubes. Applied Physics Letters, 96, 213113 (2010)
58. F. Borrnert, S. Gorantla, A. Bachmatiuk, J. H. Warner, I. Ibrahim, J. Thomas, T. Gemming, J. Eckert, G. Cuniberti, B. Buchner, M. H. Rummeli, In-situ observations of self-repairing single-walled carbon nanotubes. Physical Review B. 81, 201401(R) (2010)
57. J. H. Warner, M. H. Ruemmeli, A. Bachmatiuk, B. Buchner, Structural transformations of carbon chains inside nanotubes. Physical Review B. 81, 155419 (2010)
56. F. Borrnert, C. Borrnert, S. Gorantla, X. Liu, A. Bachmatiuk, J-O. Joswig, F. R. Wagner, F. Schaffel, J. H. Warner, R. Schonfelder, B. Rellinghaus, T. Gemming, J. Thomas, M. Knupfer, B. Buchner, M. H. Rummeli, Single-wall-carbon-nanotube/single-carbon-chain molecular junctions. Physical Review B. 81, 085439 (2010)
55. R. Beal, A. Stavrinados, J. H. Warner, J. Smith, H. Assender, A. A. R. Watt, The molecular structure of polymer-fullerene composite solar cells and its influence on device performance. Macromolecules, 43, 2343-2348, (2010)
54. J. H. Warner, M. H. Rummeli, A. Backmatiuk, B. Buchner, Atomic resolution imaging and topography of hexagonal boron nitride sheets produced by chemical exfoliation. ACS Nano 4, 1299-1304, (2010)
53. M. Zaka, J. H. Warner, Y. Ito, J. J. L. Morton, M. H. Rummeli, T. Pichler, A. Ardavan, H. Shinohara, G. A. D. Briggs. Exchange Interactions of Spin-Active Metallofullerenes in Solid-State Carbon Networks. Physical Review B 81, 075424 (2010).
52. J. H. Warner, M. H. Rummeli, A. Bachmatiuk, M. Wilson, B. Buchner. Examining Co Based Nanocrystals on Graphene Using Low-Voltage Aberration Corrected Transmission Electron Microscopy. ACS Nano 4, 470-476, (2010)
51. Y. Ito, J. H. Warner, M. Zaka, R. Pfeiffer, T. Aono, N. Izumi, H. Okimoto, J. J. L. Morton, A. Ardavan, H. Shinohara, H. Kuzmany, H. Peterlik, G. A. D. Briggs, Controlling Intermolecular Spin Interactions of La@C82 in Empty Fullerene Matrices Physical Chemistry Chemical Physics. 12,1618-1623 (2010)
50. S. Gorantla, F. Borrnert, A. Bachmatiuk, M. Dimitrakopoulou, F. Schaffel, R. Schonfelder, J. Thomas, T. Gemming, J. H. Warner, G. Cuniberti, J. Eckert, B. Buchner, M. H. Rummeli, Enhanced π-π Interactions Between a C60 Fullerene and a Buckle Bend on a Double-Walled Carbon Nanotube. Nano Research 3, 92-97 (2010)
49. H. Cao, H. Zheng, K. Liu, X. Zhang, J. H. Warner, Bioinspired Peonylike b-Ni(OH)2 Nanostructures with Enhanced Electrochemical Activity and Superhydrophobicity. ChemPhysChem, 11,489-494 (2010)
48. F. Shaffel, J. H. Warner, A. Bachmatiuk, B. Rellinghaus, B. Buchner, L. Schultz, M. H. Rummeli, On the catalytic hydrogenation of graphite for graphene nanoribbon fabrication. Physica Status Solidi (b), 246, 2540-2544 (2009)
47. M. H. Holmes, Y. S. Park, J. H. Warner, R. A. Taylor, Quantum confined Stark effect and corresponding lifetime reduction in a single InxGa1-xN quantum disk. Applied Physics Letters, 95, 181910 (2009)
46. A. Bachmatiuk, F. Borrnert, M. Grobosch, F. Schaffel, U. Wolff, A. Scott, M .Zaka, J. H. Warner, R. Klingeler, M. Knupfer, B. Buchner, M. H. Rummeli, Investigating the graphitization mechanism of SiO2 nanoparticles in CVD. ACS Nano, 3, 4098-4104 (2009)
45. S. Tetali, M. Zaka, R. Schoenfelder,; A. Bachmatiuk, F. Boerrnert, I. Ibrahim, J. Lin, G. Cuniberti, J. H. Warner, B. Buechner, M. Rummeli, Unravelling the mechanisms behind mixed catalysts for the high yield production of single walled carbon nanotubes. ACS Nano, 3, 3839-3844 (2009).
44. G. Zhong, S. Hofmann, F. Yan, H. Telg, J. H. Warner, D. Eder, C. Thomsen, W. Milne, J. Robertson, Acetylene: a key growth precursor for single-walled carbon nanotube forests Journal of Physical Chemistry C. 113, 17321-17325, 2009
43. A. Stavrinados, S. Xu, J. H. Warner, J. L. Hutchinson, J. M. Smith, A. A. R. Watt, Superstructures of PbS nanocrystals in a conjugated polymer and the aligning role of oxidation. Nanotechnology, 20, 445608 (2009)
42. J. H. Warner, Y. Ito, M. H. Rümmeli, B. Büchner, H. Shinohara, G. A. D. Briggs, Capturing the motion of molecular nanomaterials encapsulated within carbon nanotubes with ultrahigh temporal resolution. ACS Nano, 3, 3037-3044 (2009)
41. J. H. Warner, M. H. Rümmeli, L. Ge, T. Gemming, B. Montanari, N. M. Harrison, B. Büchner, G. A. D. Briggs, Structural transformations in graphene studied with high spatial and fast temporal resolution, Nature Nanotechnology, 4, p500 (2009)
Projects Available
Sensor Technology Based on Large Area Synthetic Graphene
Jamie Warner
Sensor technology, such as touch screen displays and pressure/strain sensors, will be developed using graphene. The graphene will be synthetic and of large area, produced using metal catalyst assisted chemical vapour deposition. Processing methods for transferring the graphene onto transparent flexible polymer substrates will be developed. This project aims at bringing graphene into application and will utilize recent advances within the group for producing outstanding synthetic graphene material. Optical and electron beam lithography will be used to pattern the graphene and metal electrodes for devices. Interfacing with computer hardware will be undertaken to achieve functioning sensor technology.
Also see homepages: Jamie Warner
Atomic Resolution Imaging of Defects and Grain Boundaries in Graphene
Jamie Warner, Angus Kirkland
Graphene is a 2D crystal only one atom thick and is ideal for studying individual carbon atoms using transmission electron microscopy. This project will focus on understanding fundamental crystal defects in graphene, such as edge dislocations (both glide and shuffle), mono-vacancies and the other non-6 member ring structures that exist in the unique 2D crystal. It will also investigate the grain boundary interface between two graphene domains with the aim of mapping out the unique atomic stitching that occurs. Graphene will be grown by chemical vapour deposition. This project will use Oxford's state-of-the-art aberration-corrected high resolution transmission electron microscope, equipped with a monochromator for the electron beam to give unprecedent spatial resolution at a low accelerating voltage of 80 kV. Advanced image analysis techniques, such as exit-wave reconstruction, and comparison to image simulations will be utilized for a deeper understanding of the atomic structure.
Also see homepages: Angus Kirkland Jamie Warner
Synthesis of large area graphene sheets using chemical vapour deposition
J H Warner
The 2D crystalline nature of graphene makes it suitable for large area transparent conducting electrodes. Recent advances in chemical vapour deposition (CVD) methods now permit a route to making large area sheets. This project will focus on understanding the growth mechanisms behind CVD grown graphene and then developing approaches to improve the atomic structure and electronic properties. Insights into the structure will be gained using atomic-resolution imaging with low-voltage aberration-corrected high resolution transmission electron microscopy. Techniques to transfer the sheets to transparent substrates, such as glass or flexible polymers will be examined and the sheet resistance determined. Methods to incorporate dopants into the CVD growth process will be pursued with the aim of improving conductivity. Controlling the number of graphene layers grown by CVD will be investigated.
Also see homepages: Jamie Warner
Direct electron beam lithography of graphene
J H Warner
Graphene holds a lot of promise for electronic applications. In order to be an effective semiconductor in transistors it is desirable for the width of graphene channels to be sub-10nm. This project will focus on fabricating sub-10nm features in graphene using the novel concept of direct electron beam lithography. Electron beam irradiation will be used to directly sputter carbon atoms from graphene with the aim of fabricating structures for nanoelectronic devices. Graphene structures such as nanoribbons will be produced and implemented in field effect transistors. This will involve fabricating graphene nanoelectronic devices that are compatible with high resolution transmission electron microscopy. Parameters that enable control over the graphene sputtering process will be elucidated. Atomic structure will be gained by aberration-corrected HRTEM and correlated with the electronic device properties.
Also see homepages: Jamie Warner
Controlling the edge structure of graphene
J H Warner
Field effect transistors comprised of graphene nanoribbons exhibit large on/off ratios only when their channel widths are sub-10nm. At this small size scale the structure of the edges plays a role in their transport properties. Developing methods to control the edge atomic structure is important as it will lead to uniform structures with tailored properties. This project aims to fine-tune the atomic structure of graphene nanoribbons using electron beam irradiation. Low-voltage aberration-corrected high resolution transmission electron microscopy will be used to characterize the atomic structure. Graphene nanoribbon field effect transistors will be fabricated that are compatible with electron microscopy. The small probe size in scanning transmission electron microscopy will be used to interact with atoms at the edges of the ribbons to provide greater control over the sputtering process. The goal is to improve the performance of graphene nanoribbon field effect transistors by cleaning up the atomic disorder at the edges. Other methods to improve the atomic ordering at the edges such as Joule heating will be examined whilst inside the aberration-corrected HRTEM.
Also see homepages: Jamie Warner
Integrating Inorganic Nanocrystals into Graphene Devices
Jamie Warner
Utilizing graphene in opto-electronic devices will require the effective integration of other nanomaterials to produce hybrid nanosystems. Inorganic nanocrystals such as PbS, ZnSe, TiO2 and Si, have unique semiconducting properties with band gaps that span from the near-IR to UV. This project will focus on synthesizing novel inorganic nanocrystals using solution-phase chemistry. Control over the shape to tailor spherical, rod and branched structures will be investigated. Variation of surface state morphology will be conducted through various chemical approachs to control the inter-nanocrystal interactions. Synthetic graphene will be produced using chemical vapour deposition. Composite hybrid devices will be fabricated that use synthetic graphene as a working transparent conducting electrode and the inorganic nanocrystal as the active functional nanomaterial. Viability in photodetectors and photo-catalysis will be explored.
Also see homepages: Jamie Warner
Also see a full listing of New projects available within the Department of Materials.


