OBJECITVE

EDUCATION

Ph.D. (June 2003) Materials Science and Engineering, (Electrical and Computer Engineering minor), University of Arizona, Tucson, Arizona. 
"Force microscopy of self assembled amphiphilic films"
Adviser: Professor Srinivas Manne
B.S. (1992) Physics (Math minor), University of Arizona, Tucson, Arizona.

PROFESSIONAL EXPERIENCE:

August 2003 - Present: Research Associate, Chemistry Department, University of Arizona 
Adviser: Professor Neal Armstrong

• Design and characterization of new, self-organizing organic field-effect transistor and photovoltaic materials and devices, electrical property characterization of organic materials on nanometer length scales (conductive-tip AFM).

May 1998 - August 2003: Research Assistant, Materials Science and Engineering, University of Arizona 
Adviser: Professor Srinivas Manne

• Studied thin amphiphilic films using AFM and LFM
• Designed and built ultra-stable temperature controlled fluid stage for AFM (-20C to 130C, 0.001C stability)
• Studied temperature-induced phase transitions of surface micelles with AFM
• Designed and built micromanipulation system for attaching carbon nanotubes to AFM tips
• Patterned surface chemistry modification of insulators using microcontact printing
• Supervised 4 undergraduate research projects

May 1997 – July 2001: Electrical Team, Arizona Solar Racing Team, University of Arizona

• Designed and built analog circuits for solar car control and data telemetry
• Developed computer controlled battery charger/discharger
• Trained new electrical team members
• Machined all custom mechanical parts
• Helped build two solar powered cars which raced in international competitions

Dec. 1992 -- May 1998: Research Specialist, Optical Sciences Center, University of Arizona.
Adviser: Professor Dror Sarid

• Developed conducting tip AFM nanolithography of SiO2 and Si3N4 on silicon in controlled environments
• Characterization of ultra-thin silicon dioxide using tunneling AFM
• Scanning Tunneling Microscope (STM) characterization of Au-Si Schottky barrier using Ballistic Electron Emission Microscopy (BEEM) (BEEM)

  Jan. 1991 -- Oct. 1992: Research Assistant, Physics Department, University of Arizona; Research Associate, DH Associates, Tucson, Arizona.
  Adviser: Professor Donald Huffman

  • Production, separation and characterization (UV-VIS and FTIR spectrophotometry) of Carbon 60 and other fullerenes
  • Construction, troubleshooting, and calibration of Cloud Condensation Nuclei counters

  Lab Skills

  • Expertise in Atomic Force Microscopy
  • Micromanipulation using translation stages and optical microscopy
  • Surface chemistry modification using microcontact printing
  • Strong knowledge of electronics, designing, building and testing analog circuits, and computer programming (VB) for automated instrument control and data acquisition.
  • Low noise, sub-picoampere measurement techniques
  • Hands-on experience building and troubleshooting low through UHV vacuum systems
  • Hands-on experience with semiconductor fabrication equipment
  • Extensive experience with machine shop tools
  • Basic wet chemistry techniques

  Specific Experience

  Equipment

  Equipment: Intel based computers, computer based data acquisition (DAQ cards, GPIB, RS232), Scanning Probe Microscopy, UV/VIS spectroscopy, basic FTIR spectroscopy operation, Langmuir-Blodgett trough, vacuum system from rough to ultra high vacuum, very-high-pressure equipment, image processing and analysis, oscilloscopes, spectrum analyzers, waveform generators, machine shop power tools (lathe, mill, band saw, etc) and hand tools, soldering, spot welding, gas and water plumbing, optical microscopy, basic cleanroom protocols, operation of some basic cleanroom equipment (spin coater, mask aligner, wet chemistry, horizontal furnace, reactive ion etch, stylus profilometer, air and surface particle counter), basic thermal and sputtering deposition techniques, basic scientific glass blowing, column chromatography, ultra pure water systems, surface cleaning, microcontact printing
  

  Publications

  • R. K. Workman, S. Manne, "Molecular transfer and transport in non-covalent microcontact printing", Langmuir, In press, 2003.
  • M. B. Hay, R. K. Workman, S. Manne, "Mechanisms of Metal Ion Sorption on Calcite: Composition Mapping by Lateral Force Microscopy" (pdf), Langmuir, 19 (9), 3727, 2003.
  • R. K. Workman, S. Manne, "Detection of a Diffusive 2D Gas of Amphiphiles by Lateral Force Microscopy" (pdf), Langmuir, 19 (8), 3248, 2003.
  • M. B. Hay, R. K. Workman, S. Manne, "Two-dimensional condensed phases from particles with tunable interactions" (pdf), Phys. Rev. E, 67 1, art. no. 012401 Part 1, 2003.
  • R. K. Workman, S. Manne, "Patterned Thin Water Films on Mica" (pdf), Langmuir, 18 (3), 661, 2002.
  • S. Manne, R. K. Workman, J. L. Wolgemuth, "Mesoscopic Films at Interfaces", in Reactions and Synthesis in Surfactant Systems, Marcel Dekker (New York, 2001).
  • J. L. Wolgemuth, R. K. Workman, S. Manne, "Surfactant aggregates at a flat, isotropic hydrophobic surface" (pdf), Langmuir, 16 (7), 3077, 2000.
  • R. K. Workman, S. Manne, "Variable temperature fluid stage for atomic force microscopy" (pdf), Rev. Sci. Instrum., 71 (2), 431, 2000.
  • R. K. Workman, C. A. Peterson, D. Sarid, "Current Dependent Growth of Silicon Nitride Lines Using a Conducting Tip AFM" (pdf), Surf. Sci., 423 (2-3), L277, 1999.
  • C. A. Peterson, R. K. Workman, D. Sarid, B. Vermeire, H. G. Parks, D. Adderton, P. Maivald, "Effects of moisture on Fowler-Nordheim characterization of thin silicon-oxide films" (pdf), JVST A, 17 (5), 2753-2758, 1999.
  • C. A. Peterson, R. K. Workman, X. Yao, J. P. Hunt, and D. Sarid, "V-Shaped Metallic-Wire Cantilevers for AFM and Fowler-Nordheim Imaging" (pdf), Nanotechnology, 9 (4), 331, 1998.
  • C. A. Peterson, T. G. Ruskell, J. L. Pyle, R. K. Workman, W. Yao, J. Hunt, and D. Sarid, "Multi-Step Process Control and Characterization of Scanning Probe Lithography" (pdf) , Appl. Phys. A, 66 (7), S729-S733, 1998.
  • X. Yao, R. K. Workman, C. A. Peterson, D. Chen, D. Sarid, "The bonding nature of individual C-60 molecules to Si(100) surfaces" (pdf) , Appl. Phys A, 66 (7), S107-S111, 1998.
  • D. Sarid, J. P. Hunt, R. K. Workman, X. Yao, C. A. Peterson, "The role of adhesion in tapping-mode atomic force microscopy" (pdf) , Appl. Phys A, 66 (7), S283-S286, 1998.
  • D. Sarid, X. Yao, R. K. Workman, C. A. Peterson, M. Fallahi, "Observation of interface band bending on GaAs/AlAs heterostructures by scanning tunneling microscopy", Proceedings of the SPIE, The International Society for Optical Engineering. vol. 3285, 51-58, 1998.
  • T. X. Zhong, R. K. Workman, X. Yao, G. E. Jabbour, C. A. Peterson, D. Sarid, C. W. Dirk, D. de la Cruz, and A. Nagarur, "Stability and Superstructure of Squarylium Dye TSQ Langmuir-Blodgett Films" (pdf) , Thin Solid Films, 315 (1-2), 294, 1998.
  • J. L. Pyle, T. G. Ruskell, R. K. Workman, X. Yao, D. Sarid, "Growth of Silicon Nitride by Probe Lithography" (pdf), JVST B, 15 (1), 1997.
  • X. Yao, T. G. Ruskell, R. K. Workman, D. Sarid, D. Chen, "Intermolecular Features of Individual C60 Molecules on Si(100) Observed by STM" (pdf), Surf. Sci., 367 (3), L85-L90, 1996.
  • X. Yao, T. G. Ruskell, R. K. Workman, D. Sarid, D. Chen "Scanning Tunneling Microscopy and Spectroscopy of Individual C60 Molecules on Si(100)-(2x1) Surfaces" (pdf), Surf. Sci., 366 (3), L743-L749, 1996.
  • X. Yao, D. Chen, T. G. Ruskell, R. K. Workman, D. Sarid, "Thermally-Induced Changes in Bonding Properties of C60 on Si(100)-2x1 Surfaces", Israel Journal of Chemistry, 36 (1), 55-58, 1996.
  • T. G. Ruskell, J. L. Pyle, R. K. Workman, X. Yao, D. Sarid, "Current Dependent Silicon Oxide Growth During Scanned Probe Lithography" (pdf), Electronics Letters, 32 (15), 1411, 1996.
  • D. Sarid, T. G. Ruskell, R. K. Workman, D. Chen, "Driven nonlinear AFM cantilevers: From non-contact to tapping modes of operation" (pdf), JVST B, 14 (2), Mar/Apr 1996.
  • D. Chen, R. K. Workman, D. Sarid, "Adsorption and Decomposition of C60 Molecules on Si(111) Surfaces" (pdf) , JVST B, 14 (2), Mar/Apr 1996.
  • T. G. Ruskell, R. K. Workman, D. Chen, D. Sarid, S. Dahl, S. Gilbert, "High resolution Fowler-Nordheim field emission maps of thin silicon oxide layers" (pdf), Applied Physics Letters, 68 (1), 93, 1996.
  • D. Chen, R. K. Workman, D. Sarid, "Growth mechanism of silicon carbide films on silicon substrates using C60 carbonization" (pdf), Surf. Sci., 344 (1-2), 23, 1995.
  • D. Sarid, J. Chen, R. K. Workman, "Numerical Simulation of a Tapping-Mode Scanning Force Microscope Operating in a Liquid", Computational Materials Science, 3 (4), 475, 1995.
  • J. Chen, R. K. Workman, D. Sarid, R. Höper, "Numerical Simulation of a Scanning Force Microscope with a Large-Amplitude Vibrating Cantilever" (pdf), Nanotechnology, 5 (4), 199, 1994.
  • D. Chen, R. K. Workman, D. Sarid, "Fabrication Of SiC Films On Si(100) Using A C60 Molecular Source" (pdf), Electronics Letters, 30 (12), 1007, 1994.
  • R. Höper, R. K. Workman, D. Chen, D. Sarid, et. al. "Single-Shell Carbon Nanotubes Imaged by Atomic Force Microscopy" (pdf), Surface Science, 311 (3), L731, 1994.
  • T. Chen, S. Howells, M. Gallagher, D. Sarid, L. D. Lamb, D. R. Huffman, R. K. Workman, "Scanning Tunneling Microscopy and Spectroscopy of C70 Thin Films on Gold Substrates" (pdf), Phys. Rev. B, Rapid Comm., 45 (24), 14411, 1992.
  • L. D. Lamb, D. R. Huffman, R. K. Workman, S. Howells, T. Chen, D. Sarid, R. F. Ziolo, Extraction and STM Imaging of Giant Spherical Fullerenes" (pdf), Science, 255, 1413, 1992.

  Scientific Presentation

  • Seeing at the Nanoscale, University of California Santa Barbara, Santa Barbara, California, 2003, talk and poster.
  • Colloid and Interface Technology: Fundamentals and Applications, Lund University, Lund, Sweden, 2002, poster.
  • ACS 75th Colloid and Surface Science Symposium, Carnegie Mellon University, 2001, talk.
  • MRS Spring 1999 Meeting, San Francisco, Ca, 1999, talk.

  References

  Upon request