END-OF-THE-YEAR REPORT
PUBLICATIONS/PATENTS/PRESENTATIONS/HONORS/STUDENTS REPORT
for
GRANT or CONTRACT: N00014-99-1-0406
to Rice University
This report is for a subcontract to The Pennsylvania State University.
PR Number: 99PR04568-00
Moleware and the Molecular Computer
Paul S. Weiss
Department of Chemistry
The Pennsylvania State University
152 Davey Laboratory
University Park, PA 16802-6300
Date Submitted
1 July 1999
Reproduction in whole, or in part, is permitted for any purpose of the United States Government.
This document has been approved for public release and sale, its distribution is unlimited.
DARPA/Office of Naval Research End-of-the-Year (EOY) Report
Reporting period:
1 March 1999 to 31 May 1999
PR Number: 99PR04568-00
EOY Report - PART I
a. Papers submitted to refereed journals, but not yet published:
Scanning Probe Studies of Single Nanostructures, G. S. McCarty and P. S. Weiss, Chemical Reviews, in press.
Scanning Tunneling Microscopy and Spectroscopies of Nanometer-Scale Particles, G. S. McCarty, J. C. Love, J. G. Kushmerick, L. F. Charles, C. D. Keating, B. J. Toleno, M. E. Lyn, A. W. Castleman, Jr., M. J. Natan, and P. S. Weiss, Journal of Nanoparticle Research 1 (1999), in press.
b. Papers published in refereed journals:
None.
c. Books or chapters submitted, but not yet published:
None.
d. Books or chapters published:
None.
e. Printed technical reports/non-refereed papers:
None.
f. Patents filed:
J. M. Tour, M. A. Reed, J. M. Seminario, D. L. Allara, and P. S. Weiss, "Molecular Computer," Filed Provisional Patent January 21, 1999. This idea was generated while preparing the proposal.
g. Patents granted:
None.
h. Invited presentations:
University of California at Berkeley, Department of Chemistry and the Lawrence Berkeley Laboratory, "Exploring and Controlling the Atomic-Scale World," P. S. Weiss, Berkeley, CA, March 4, 1999.
IBM Almaden Research Center, "Exploring and Controlling the Atomic-Scale World," P. S. Weiss, San Jose, CA, March 5, 1999.
University of California at Santa Barbara, Department of Chemistry, "Exploring and Controlling the Atomic-Scale World," P. S. Weiss, Santa Barbara, CA, March 8, 1999.
i. Submitted presentations:
None.
j. Honors/Awards/Prizes for contract/grant employees:
Aimee L. Bross
Eberly College of Science John and Elizabeth Teas Scholarship.
American Chemical Society, Analytical Chemistry Division I. M. Kolthoff Undergraduate Research Award.
l. Other funding:
Date: September 15, 1994 - October 31, 1999.
Title: Surface Chemistry and Spectroscopy: From Model to Real Systems.
Agency: National Science Foundation. Includes supplements and Creativity Award
Extension.
Amount: $633,500.
Date: January 1, 1997 - September 30, 1999.
Title: Creation and Measurement of Components for Nanometer-scale and Hybrid-
Function Devices.
Submitted to: Office of Naval Research.
Amount: $318,325.
Date: April 1, 1997 - August 31, 1999.
Title: The Chemistry of Catalyst Surfaces.
Agency: Petroleum Research Fund administered by the American Chemical Society.
Amount: $55,000.
Date: July 1, 1999 - June 30, 2000.
Title: Control of Structure and Properties in Monomolecular Films.
Agency: Army Research Office.
Amount: $75,000.
Date: September 30, 1998 - September 29, 2001.
Title: New DNA Microarray Detection Techniques in the Study of Stress-Induced
Changes in Plant Gene Expression.
Submitted to: National Science Foundation.
Amount: $1,801,988.
Participation: $564,264 PSW. Co-investigator with two others.
EOY Report - PART II
- a. Principal Investigator
Paul S. Weiss
- b. Current telephone number
(814) 865-3693 voice
(814) 863-5516 fax
- c. Cognizant ONR Program Officer
Dr. John C. Pazik
- d. Program objective
We assemble, measure, and optimize the components from which we will fabricate a molecular computer. Thus, we must confirm that targeted structures and properties have been made. We elucidate the properties, structures, and configurations of assemblies found to be useful. We also perform some atomic-scale manipulation of components to test potential structures (such as a three-terminal molecular device.
- e. Most significant results during the last year (three months, in this case)
We have measured caltrops molecules with STM, XPS, and scanning tunneling spectroscopy. These molecules are the proposed bases of the molecular switches. We have shown that these molecules are somewhat aggregated on the surface and are not entirely reacted as deposited.
- f. Brief summary of plans for next year's work
We will examine larger structures assembled for components of the molecular computer. We will measure the potential and switching times for molecules and assemblies placed/positioned between electrodes. We will identify the assemblies functioning as desired (from the programmable gate array work) so as to be able to target or to synthesize these. We will confirm that targeted structures both exist and behave as predicted. This will greatly reduce the fraction of faults in the devices fabricated.
We have begun to deposit very closely spaced electrodes so as to be able to probe biased molecules/assemblies placed/positioned between. We will bring this work to fruition using the Penn State and Cornell Nanofabrication facilities. We will need to use the STM for the last steps of this process -- fabricating the final ends of the electrodes and positioning the assemblies to study. This challenging problem has not been addressed for other than the very high aspect ratio nanotubes, but is critical for our more compact assemblies.
- g. List of names of graduate students and post-doctoral(s) currently working on the project
Terry G. D'Onofrio
Gregory S. McCarty
Jason D. Monnell
EOY Report - PART III
Provides the Division with material to defend and support current and future research in the field.
a. 5-part viewgraph 
(or full size JPEG version)
We use atomic-scale measurements to assess the success of deposition, assembly, and design of molecular components. The inset shows the design of a molecular switch which can be activated with an electric field. We have thus far imaged the base of this molecule (synthesized in the Tour group) using STM deposited in collaboration with the Allara group. We have also performed XPS and in our collaboration with the Allara group infrared spectroscopy. We have also done tunneling spectroscopy to show the gap associated with the base.
- b. Supporting viewgraph #1
(or full size JPEG version)
Caltrops are to serve as a base of attachment for the molecular switches. Our initial deposition procedures appear to suffer from two difficulties. The first is incomplete reactivity with the surface. This is apparent from the XPS spectra in which two distinct S doublets are found. We assign these to S being reacted and not with the surface.
There is no evidence the S is oxidized.
The deposition procedures for these molecules are being optimized so as to ensure (more) complete reaction. One possibility with the hierarchical assembly is to pre-react prior to deposition. This has potential advantages (cf. the recent work of S. Pantelides or C. Joachim) as in this manner we may be able to vary the surface electrode connection.
- c. Supporting viewgraph #2
(or full size JPEG version)
Another difficulty with deposition of caltrops appears to be aggregation. The STM image at left shows a string of caltrops. The apparent height variations may be the two states on the surface -- reacted feet or not. STM spectroscopy enables measurement of the electronic properties of these bases for molecular switches. See also frequency dependent measurements possible via ACSTM and photon emission STM (discussed in this year's ONR report.
DARPA / OFFICE OF NAVAL RESEARCH
PUBLICATIONS/PATENTS/PRESENTATIONS/HONORS REPORT
PR Number: 99PR04568-00
Contract/Grant Number: N00014-99-1-0406
Contract/Grant Title: Moleware and the Molecular Computer
Grant Principal Investigator: James M. Tour
Mailing Address:
Center for Nanoscale Science and Technology
Rice University, MS 222
6100 Main Street
Houston, TX 77005
Phone: 713-737-6246
FAX: 713-737-6250
Email: tour@rice.edu
This subcontract Principal Investigator:
Paul S. Weiss
Mailing Address:
152 Davey Laboratory
The Pennsylvania State University
University Park, PA 16802-6300
Phone Number: (814) 865-3693
Fax Number: (814) 863-5516
E-mail Address: stm@psu.edu
http address: http://stm1.chem.psu.edu/
- a. Number of papers submitted to refereed journals, but not published: 2
- b. + Number of papers published in refereed journals: 0
- c. + Number of books or chapters submitted, but not yet published: 0
- d. + Number of books or chapters published: 0
- e. + Number of printed technical reports/non-refereed papers: 0
- f. Number of patents filed: 1
- g. + Number of patents granted: 0
- h. + Number of invited presentations: 3
- i. + Number of submitted presentations: 0
- j. + Honors/Awards/Prizes for contract/grant employees: 2
- k. Total number of Full-time equivalent Graduate Students and Post-Doctoral associates supported during this period, under this R&T project number: 2
- Graduate Students: 1
- Post-Doctoral Associates: 1
- including the number of,
- Female Graduate Students: 0.5
- Female Post-Doctoral Associates: 0
- Minority* Graduate Students: 0.5
- Minority* Post-Doctoral Associates: 0
- Asian Graduate Students: 0
- Asian Post-Doctoral Associates: 0
