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Ordered nanoparticle arrays formed on engineered chaperonin protein templates
R Andrew McMillan1, Chad D Paavola, Jeanie Howard
1NASA Ames Research Center, Center for Nanotechnology and Astrobiology Technology Branch, Mail Stop 239-15, Moffett Field, California 94035, USA. amcmillan@mail.arc.nasa.gov
Nature Materials
|March 6, 2003
Summary
Researchers engineered protein templates called chaperonins to create ordered nanoscale arrays of metal and semiconductor quantum dots. This novel method offers a new way to organize nanoparticles for advanced electronic and photonic devices.
Area of Science:
- Nanotechnology
- Materials Science
- Biotechnology
Background:
- Traditional nanoscale array fabrication relies on lithography.
- Nanoscale templates from synthetic or biological materials offer alternative approaches.
- Proteins can self-assemble into ordered two-dimensional arrays.
Purpose of the Study:
- To fabricate nanoscale ordered arrays of metal and semiconductor quantum dots.
- To utilize genetically engineered protein templates for nanoparticle organization.
- To explore applications in next-generation electronic and photonic devices.
Main Methods:
- Engineered thermostable recombinant chaperonin subunits to create protein templates with specific pore sizes (3 nm or 9 nm) and reactive thiols.
- Crystallized engineered chaperonins into two-dimensional templates up to 20 micrometers in diameter.
- Used periodic, solvent-exposed thiols within templates for size-selective binding and organization of gold and cadmium selenide-zinc sulfide (CdSe-ZnS) quantum dots.
Main Results:
- Successfully fabricated ordered nanoscale arrays of gold (1.4, 5, 10 nm) and CdSe-ZnS (4.5 nm) quantum dots.
- Achieved organization defined by the underlying protein crystal lattice.
- Demonstrated manipulation and organization of quantum dots using modified chaperonins.
Conclusions:
- Genetically engineered chaperonins serve as effective templates for creating ordered quantum dot arrays.
- This protein-based self-assembly method provides precise control over nanoparticle organization.
- The developed technique enables the creation of nanoscale arrays for advanced electronic and photonic applications.