239 K
4 pp.
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TitleSupersonic Bare Metal Cluster Beams. Final Report
Author(s)Smalley, R. E.
Publication DateOctober 14, 1997
Report NumberDOE/ER/13429--9
Unique IdentifierACC0057
Other NumbersLegacy ID: DE97008826; OSTI ID: 527522
Research OrgRice University, Houston, TX (United States)
Contract NoFG05-85ER13429
Sponsoring OrgUSDOE Office of Energy Research (ER), Washington, DC (United States)
Subject40 Chemistry; 36 Materials Science
KeywordsTransition Elements; Fullerenes; Progress Report; Research Programs; Cluster Beams; Atomic Clusters; Activation Energy; Chemical Preparation; Surface Properties; Hydrogen; Heterogeneous Catalysis; Electronic Structure; Doped Materials
Related Web PagesRichard Smalley, Buckminsterfullerene [the Buckyball], and Nanotubes
AbstractA major portion of the project involved elucidating the relation between reactivity and the electronic structure of transition-metal (TM) clusters of 2--200 atoms, which required the construction and continuous development of two principal apparati; the Fourier Transform-Ion Cyclotron Resonance (FT-ICR) apparatus, and Ultraviolet Photoelectron Spectroscopy (UPS). Together, these machines have enabled the most detailed probing of the structure and chemical reactivity of TM clusters. Clusters of all the transition metals were included in these studies. Fundamental aspects in chemisorption, reactivity, and heterogeneous catalysis have also become better understood as a result of these experiments for important classes of systems such as H{sub 2}, CO, and CO{sub 2} adsorbed onto clusters of many of the metals listed above. In particular, a correlation was found between reactivity of H{sub 2} with Fe, Co, and Ni clusters and differences between the cluster IP and EA. As recounted in a previous technical report, the DOE`s role in the initial discovery of fullerenes at Rice was central, and from the start investigations were made into metal atoms trapped in the fullerenes cage. More recently, the authors have discovered that 2--4 atoms of La, Y, or Sc can be produced by laser vaporization of composite graphite/metal-oxide disks. This work was largely motivated by the prospects of using such endohedral TM metals for their catalytic activity without the well-known difficulties of effective support media and lack of control over particle size. Thus, while it will certainly be important to discover ways to efficiently scale up production (e.g., the solar generation method explored with DOE support), the efforts have concentrated more on characterization, purification, and manipulation of doped fullerenes. For the past two years, much of the group`s effort has involved the production, purification, and characterization of carbon nanotubes.
239 K
4 pp.
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