singapore-mit alliance programme for advanced materials in micro- and nano-systems
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Singapore-MIT Alliance Programme for Advanced Materials in Micro- and Nano-Systems Flagship Research Program Annual Report Nanotechnology on a Silicon Platform Co-Chairs: Choi Wee Kiong (NUS) and Carl V. Thompson (MIT) - PowerPoint PPT PresentationTRANSCRIPT
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Singapore-MIT Alliance Programme for
Advanced Materials in Micro- and Nano-SystemsFlagship Research Program
Annual Report
Nanotechnology on a Silicon Platform
Co-Chairs: Choi Wee Kiong (NUS) and Carl V. Thompson (MIT)
Faculty Associates: Dimitri Antoniadis (MIT), Yet-Ming Chiang (MIT), W.K. Chim (NUS), S.J. Chua (NUS/IMRE), Eugene Fitzgerald (MIT), K.P. Loh
(NUS), Nicola Marzari (MIT), K.L. Pey (NTU), Caroline Ross (MIT), Henry I. Smith (MIT), Francesco Stellacci (MIT), John Thong (NUS), C.C. Wong
(NTU), S.F. Yoon (NTU), Q. Zhang (NTU)
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Objective: Develop and demonstrate concepts and processes for assembling nanoscale materials in complex, deterministic patterns, in which they can be incorporated into complex patterns of devices.
• Our program was originally organized into thrusts on:NanolithographyTemplated Self-AssemblyChemically-Driven AssemblyField-Driven Assembly
with exploratory research on nanowire photonic devices and nanodot memory devices.
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• As our program has matured, advances in templated, chemically-driven and field-driven assembly, have been applied to organization of specific devices and device structures. We therefore now organize our program along the following themes:
Nanolithography and Templated Self Assembly Nanodots: Synthesis, Assembly, and Devices Nanowires: Synthesis, Assembly, and Devices Nanotubes: Synthesis, Assembly, and Devices
• The original research on assembly approaches continues within this revised structure, and the original milestones and deliverables have been retained.
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Templated-self-assembly:Long-range-ordered scaffolds for functional nanowire arrays
Self-assembled two-component colloidal
crystal, for photonic and phononic devices
Deep sub-lithographic assembly of lamella arrays for nanoscale patterning of in-plane wire arrays
Self-assembled Ge nanodots for memory devices
Chemically-directed dielectrophoretic
assembly of nanodots between electrodes
Some Assembly Examples from This Year
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Electrical Characterization of a Self-Assembled Si NW FET: Demonstration of Concept
•Templated assembly of catalyst and colloidal particles (Thompson, Choi, Chiang, Wong)• Vapor-liquid-sold wire growth (Pey, Fitzgerald, Choi, Antoniadis, Thompson) • Characterization and modeling (Antoniadis, Pey)• Cross-over research: catalyst assembly techniques
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1. Nanolithography and Templated Self Assembly
Methods for producing large areas of periodic structures with different length scales and different symmetries
Accomplished, further research ongoing
nanotlithography, templated assembly of periodic structures with and without controlled defects
In progress
Tools and procedures for use of SOBL (Scanning Optical Beam Lithography) and ZPAL for high-throughput, quick turn around techniques for production of complex patterns
This deliverable has been changed. A new approach based on modulation lithography in conjunction with ZPAL is being pursued instead
2. Chemically-Directed Assembly Methods for solubilizing nanotubes, metal nanoparticles, and semiconductor nanowires
Accomplished, further research ongoing
Methods for theoretical predictions of chemistries for versatile assembly and anchoring
Accomplished for carbon nanotubes. Further research ongoing
Development of lithographic methods to produce patterned self-assembled monolayers with resolution comparable or smaller than the nanomaterials
Accomplished.
Procedures for building and use of nanobreadboards In progress: recent breakthrough in pore clearing for conductive underlayers
Definition and demonstration of protocols for chemically directed assembly of specific devices and systems
Accomplished, but continued research in progress. nanodot single-electron devices
3. Engineered Nano-Dot Catalysts for Nano-Systems
Demonstrations of nanobreadboards for assembly and characterization of nanodevices
On track
Methods for creation of large-areas of ordered arrays of uniform nanotubes, wires, and dots.
Accomplished, but continued research ongoing: Ni nanowire arrays
Methodologies for high-resolution characterization of systems of nanostructures
On track
Fabrication of biosensor arrays On track (with CNT based sensors)
Growth and properties of semiconductor nanowire arrays, e.g. BN and MoS2.
On track, but so far with a focus on group IV and III-V semiconductor nanowires
Deliverable Updates:
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4. Ordered Nanoparticle Structures through Field-Assisted Colloidal Self-Assembly
Method for surface-moderated multi-component colloidal crystallization of complex nanostructures
On track: successful templating of single-component structure, successful untemplated growth of multi-component crystals
Method for field-driven self-assembly of colloidal systems on various substrates
Accomplished, but continued research underway: field-driven assembly of CNTs and Au nanoparticles
Design guidelines for the use of field and surface assistance in trapping, assembly, and controlled placement of colloidal nanoparticles
On track
5. Nanomaterials and Technology for Integrated Optical Devices
Semiconductor heterostructure nanoscience and nanoprocessing
On track: ZnO nanowires and devices on GaN
Exploratory structures and devices which may contain novel functionality
On track
6. Integrated Nanomaterials and Technology for Information Storage
A template for the synthesis of nanodot and nanowire In progress
Develop method for the growth of heterogeneous nanowires In progress
Memory devices based on nanodots with high-k dielectric layer
Still feasible, but under evaluation
Deliverable Updates:
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Outreach
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Outreach
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♦ Flagship research activities have been highly collaborative and have involved exchanges of visits of students and staff among all three universities.
♦ These research interactions have already led to many publications (36 journal articles, of which 22 are joint publications), and these interactions are expected to lead to an increasing number of joint publications in future years.
♦ Flagship research teams are expanded by students and postdocs with other support, research is often complimentary to research supported through other programs, both within the US and Singapore, and is therefore leveraged through this support other support.