Scientific Publications As An Undergraduate
The encapsulation and in situ rearrangement of polycrystalline SnO inside carbon nanotubes
Author(s)
SLOAN J. (1) ; COOK J. (1) ; HEESOM R. J. R. (1) ; GREEN M. L. H. (1) ; HUTCHISON J. L. (2)
Author(s) Affiliation(s)
(1) Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QR, ROYAUME-UNI
(2) Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, ROYAUME-UNI
Abstract
Polycrystalline SnO has been deposited inside opened carbon nanotubes via a pH-controlled precipitation process. The encapsulated material was investigated via powder X-ray diffractions HRTEM and EDX in a FEGTEM incorporating a 0.7 nm electron probe. The encapsulated crystallites were spherical or ellipsoidal in shape and varied between 2 and 6 nm in diameter. In general the crystallites packed evenly along the length of the internal cavities of the nanotubes. Rearrangements of individual crystallites were induced in both the HRTEM and FEGTEM during normal observation and took place over several minutes. Small movements and reorientations were observed for individual crystallites inside the nanotube cavities.
Journal Title
Journal of crystal growth ISSN 0022-0248 CODEN JCRGAE
Source
1997, vol. 173, no1-2, pp. 81-87 (9 ref.).
Language
English
Publisher
Elsevier, Amsterdam
Purification of rhodium-filled carbon nanotubes using reverse micelles
Author(s)
SLOAN J. (1) ; COOK J. (1) ; HEESOM R. J. R. (1) ; GREEN M. L. H. (1) ; HAMMER J. (1)
Author(s) Affiliation(s)
(1) Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QR, ROYAUME-UNI
Abstract
Reverse micelles present self-assembled multi-molecular entities formed within specific compositional ranges of water-in-oil microemulsions. The structure of a reverse micelle is typically represented as nano-sized droplet of a polar liquid phase, capped by a monolayer of surfactant molecules, and uniformly distributed within a non-polar, oil phase. Rhodium was deposited exclusively inside opened carbon nanotubes via the use of reverse micelles thereby presenting the possibility of Rhodium nanowires that exhibit quantum effects.
Journal Title
Journal of the Chemical Society, Chemical Communications
Source
1996, pp. 2673-2674
Language
English
Identifying Materials Incorporated into Carbon Nanotubes by HRTEM and Microanalysis
Author(s)
SLOAN J. (1) ; COOK J. (1) ; CHU A. (1); HEESOM R. J. R. (1) ; GREEN M. L. H. (1) ; HUTCHISON J. L. (2); KAWASAKI M. (3)
Author(s) Affiliation(s)
(1) Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QR, ROYAUME-UNI
(2) Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, ROYAUME-UNI
(3) JEOL Ltd., 1-2, Musashino 3-chome Akishima, Tokyo 196-8558, Japan
Abstract
Electron nanodiffraction, particularly as performed in a dedicated STEM instrument with coherent illumination, provides, in principle, a means for obtaining information on structural detail in the range between that of STEM image resolution, about 0.2 nm, and the limits of information possible from elastic scattering from atoms, about 0.03 nm. In practice, most nanodiffraction work has been concerned with finding the crystal structure, crystal defects, and sometimes crystal shapes for nanoparticles in the size range of 1-2 nm or for regions of thin crystalline films of about these dimensions. Available equipment allows for the recording of nanodiffraction patterns at the rate of 30 per second, or faster, providing means for detailed study of extended areas or of dynamical processes.
Journal Title
JEOL news
Source
1996, 32E No. 1
Language
English
Publisher
JEOL Ltd.
1-2, Musashino 3-chome Akishima
Tokyo 196-8558, Japan
Synthesis of carbon nanotubes containing metal oxides and metals of the d-block and f-block transition metals and related studies
Author(s)
CHEN Y. K. (1) ; CHU A. (1) ; COOK J. (1) ; GREEN M. L. H. (1) ; HARRIS P. J. F. (1) ; HEESOM R. J. R. (1) ; HUMPHRIES M. (1) ; SLOAN J. (1) ; TSANG S. C. (1) ; TURNER J. F. C. (1)
Author(s) Affiliation(s)
(1) Inorganic Chemistry Laboratory, University of Oxford, Oxford, OX1 3QR, ROYAUME-UNI
Abstract
The filling of carbon nanotubes with metals and metal oxides via one- and two-step processes is presented. Both molten media and wet chemistry solution methods have been used to introduce foreign materials into the hollow nanotube cavities. Chemical reactions inside the tubes have been carried out, including the reduction of encapsulated materials to the metals. The nature of the crystalline filling has been found to be highly dependent on the techniques used. Wet chemical methods tend to result in filling which consists of discrete crystallites, whereas molten media methods tend to give long, continuous single crystals.
Journal Title
Journal of material chemistry ISSN 0959-9428
Source
1997, vol. 7, no3, pp. 545-549 (22 ref.)
Language
English
Publisher
Royal Society of Chemistry, Cambridge, ROYAUME-UNI
Filling of Carbon Nanotubes with Silver, Gold and Gold Choride
Author(s)
CHU A. (1) ; COOK J. (1) ; HEESOM R. J. R. (1) ; HUTCHISON J. L. (2) ; GREEN M. L. H. (1) ; SLOAN J. (1) ;
Author(s) Affiliation(s)
(1) Inorganic Chemistry Laboratory, South Parks Road, Oxford OX1 3QR, ROYAUME-UNI
(2) Department of Materials, Parks Road, Oxford OX1 3PH, ROYAUME-UNI
Abstract
The synthesis of carbon nanotubes filled with silver, gold, and gold chloride is described. The resulting materials have been studied by high-resolution electron microscopy, X-ray powder diffraction, and energy-dispersive spectroscopy (EDS). The EDS data were obtained using a high-resolution electron microscope equipped with a field emission gun which allowed for X-ray analytical data to be obtained on individual particles located within the carbon nanotubes using a 0.7 nm probe.
Journal Title
Chemistry of materials ISSN 0897-4756
Source
1996, vol. 8, no12, pp. 2751-2754 (25 ref.)
Language
English
Publisher
American Chemical Society, Washington, DC, ETATS-UNIS