Articles by John N. Randall in JoVE
Atomically Traceable Nanostructure Fabrication Josh B. Ballard1, Don D. Dick2, Stephen J. McDonnell3, Maia Bischof4, Joseph Fu5, James H. G. Owen1, William R. Owen1, Justin D. Alexander1, David L. Jaeger4, Pradeep Namboodiri5, Ehud Fuchs1, Yves J. Chabal3, Robert M. Wallace3, Richard Reidy4, Richard M. Silver5, John N. Randall1, James Von Ehr1 1Zyvex Labs, 2Department of Physics, University of Texas at Dallas, 3Department of Materials Science and Engineering, University of Texas at Dallas, 4Materials Science and Engineering, University of North Texas, 5National Institute of Standards and Technology We report a protocol for combining the atomic metrology of the Scanning Tunneling Microscope for surface patterning with selective Atomic Layer Deposition and Reactive Ion Etching. Using a robust process involving numerous atmospheric exposures and transport, 3D nanostructures with atomic metrology are fabricated.
Other articles by John N. Randall on PubMed
A Density-functional Theory Study of Tip Electronic Structures in Scanning Tunneling Microscopy Nanotechnology. Mar, 2013 | Pubmed ID: 23416430 In this work, we report a detailed analysis of the atomic and electronic structures of transition metal scanning tunneling microscopy tips: Rh, Pd, W, Ir, and Pt pyramidal models, and transition metal (TM) atom tips supported on the W surface, by means of ab initio density-functional theory methods. The d electrons of the apex atoms of the TM tips (Rh, Pd, W, Ir, and Pt tetrahedral structures) show different behaviors near the Fermi level and, especially for the W tip, dz(2) states are shown to be predominant near the Fermi level. The electronic structures of larger pyramidal TM tip structures with a single apex atom are also reported. Their obtained density of states are thoroughly discussed in terms of the different d-electron occupations of the TM tips.