Nanotechnology Now

Our NanoNews Digest Sponsors



Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Fabricating Nanostructures with Silk Could Make Clean Rooms Green Rooms

Above: Optical-grade silk fibroin aqueous solution, obtained from the cocoons of the Bombyx mori caterpillar, was placed on a substrate and spin-coated to form a silk film. Both positive and negative resists were formed and developed using water.
Above: Optical-grade silk fibroin aqueous solution, obtained from the cocoons of the Bombyx mori caterpillar, was placed on a substrate and spin-coated to form a silk film. Both positive and negative resists were formed and developed using water.

Abstract:
Tufts University engineers have demonstrated that it is possible to generate nanostructures from silk in an environmentally friendly process that uses water as a developing agent and standard fabrication techniques. This approach provides a green alternative to the toxic materials commonly used in nanofabrication while delivering fabrication quality comparable to conventional synthetic polymers. Nanofabrication is at the heart of manufacture of semi-conductors and other electronic and photonic devices.

Fabricating Nanostructures with Silk Could Make Clean Rooms Green Rooms

Medford/Sumerville, MA | Posted on March 31st, 2014

The paper describing this work, "All Water-based Electron Beam Lithography Using Silk as a Positive, Negative and Biofunctional Resist," appears in Nature Nanotechnology, published online March 23 in advance of print publication.

"In a world that strives to reduce toxic footprints associated with manufacturing, our laboratory is exploring biopolymers, and silk in particular, as a candidate material to replace plastics in many high-technology applications," said Frank C. Doble Professor of Biomedical Engineering Fiorenzo Omenetto, Ph.D., senior researcher on the work.

Nanofabrication involves high-resolution patterning with features so small that they have at least one dimension no larger than 100 nanometers (nm)—the size of particles filtered out by surgical masks. Nanoscale fabrication is usually obtained depositing thin films of customized polymers, called "resists," onto silicon wafers. Each resist layer is successively patterned by using light or electrons (via electron beam lithography) to expose the part of the resist not covered by a mask. Subsequently, positive resists are dissolved when subjected to a developer while negative resists remain behind after development. The composition and configuration of the layers determine the properties of the structure.

Developing a resist typically requires toxic chemicals, which need careful, and costly, handling and disposal. Significant advances have been made using "green" resists that can be developed with water, but these techniques have lacked the desired precision and scalability.

"In contrast, our process is entirely water-based, starting with the silk aqueous solution and ending with simple development of the exposed silk film in water, and the resolution achieved was comparable to one of the commonly used synthetic polymers," said Omenetto, who holds a professorship in the Department of Physics at Tufts School of Arts and Sciences in addition to his appointment in the School of Engineering. "A variety of manufacturing industries, high-tech companies and academic labs could ultimately benefit from clean rooms that are also green."

For this work, the Tufts engineers fabricated nanoscale photonic lattices using both neat silk and functionalized silk doped with quantum dots, green fluorescent proteins (GFPs) or horseradish peroxidase (HRP).

"By showing that biomolecules of the enzyme HRP remained active after the electron beam nanofabrication process, we demonstrated the feasibility of fabricating biologically active silk sensing devices, something not currently available," said Benedetto Marelli, Ph.D. Marelli is a post-doctoral associate in Omenetto's laboratory and a lead co-author on the paper with former Omenetto post doctoral associate Sunghwan Kim, Ph.D., now a professor in Ajou, Korea.

This research builds on previous work by Omenetto and his collaborators at the Tufts School of Engineering. In the past, they had shown that silk could be nanofabricated, but those processes required starting with other nanosized materials. This is the first time that silk has been fabricated to begin the nanofabrication manufacturing chain.

The work was supported by the National Science Foundation (DMR-1242240), ONR (N00014-13-1-0596) and AFOSR (FA9950-10-1-0172).

"All-water-based electron-beam lithography using silk as a resist," Sunghwan Kim, Benedetto Marelli, Mark A. Brenckle, Alexander N. Mitropoulos, Eun-Seok Gil, Konstantinos Tsioris, Hu Tao, David L. Kaplan, & Fiorenzo G. Omenetto, Nature Nanotechnology, doi:10.1038/nnano.2014.47, published online 23 March 2014.

####

About Tufts University
Located on Tufts’ Medford/Somerville campus, the Tufts University School of Engineering offers a rigorous engineering education in a unique environment that blends the intellectual and technological resources of a world-class research university with the strengths of a top-ranked liberal arts college. Close partnerships with Tufts’ excellent undergraduate, graduate and professional schools, coupled with a long tradition of collaboration, provide a strong platform for interdisciplinary education and scholarship. The School of Engineering’s mission is to educate engineers committed to the innovative and ethical application of science and technology in addressing the most pressing societal needs, to develop and nurture twenty-first century leadership qualities in its students, faculty, and alumni, and to create and disseminate transformational new knowledge and technologies that further the well-being and sustainability of society in such cross-cutting areas as human health, environmental sustainability, alternative energy, and the human-technology interface. For more information, visit engineering.tufts.edu.

For more information, please click here

Contacts:
Kim Thurler

617.627.3175

Copyright © Tufts University

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

Nanoimprinting of Silk:

Biomedical Engineering at Tufts:

Related News Press

News and information

Measure Both Elastic and Viscous Properties with AFM Using Asylum Research’s Exclusive AM-FM Viscoelastic Mapping Mode August 28th, 2014

Aspen Aerogels, Inc. to Present at Barclays CEO Energy-Power Conference August 27th, 2014

Nanotech Security Corp. to Acquire Fortress Optical Features Ltd., a Leading Producer of Banknote Security Features August 27th, 2014

Malvern specialists to deliver inaugural short course on polymer characterization at Interplas 2014 August 27th, 2014

Chip Technology

Scientists craft atomically seamless, thinnest-possible semiconductor junctions August 26th, 2014

RMIT delivers $30m boost to micro and nano-tech August 26th, 2014

Competition for Graphene: Berkeley Lab Researchers Demonstrate Ultrafast Charge Transfer in New Family of 2D Semiconductors August 26th, 2014

Symphony of nanoplasmonic and optical resonators leads to magnificent laser-like light emission August 26th, 2014

Discoveries

The thunder god vine, assisted by nanotechnology, could shake up future cancer treatment: Targeted therapy for hepatocellular carcinoma using nanotechnology August 27th, 2014

Creation of a Highly Efficient Technique to Develop Low-Friction Materials Which Are Drawing Attention in Association with Energy Issues August 26th, 2014

Competition for Graphene: Berkeley Lab Researchers Demonstrate Ultrafast Charge Transfer in New Family of 2D Semiconductors August 26th, 2014

Symphony of nanoplasmonic and optical resonators leads to magnificent laser-like light emission August 26th, 2014

Materials/Metamaterials

Nanodiamonds Are Forever: A UCSB professor’s research examines 13,000-year-old nanodiamonds from multiple locations across three continents August 27th, 2014

Creation of a Highly Efficient Technique to Develop Low-Friction Materials Which Are Drawing Attention in Association with Energy Issues August 26th, 2014

Competition for Graphene: Berkeley Lab Researchers Demonstrate Ultrafast Charge Transfer in New Family of 2D Semiconductors August 26th, 2014

Thermal Block Coatings Developed in Iran Using Nanotechnology August 26th, 2014

Announcements

Measure Both Elastic and Viscous Properties with AFM Using Asylum Research’s Exclusive AM-FM Viscoelastic Mapping Mode August 28th, 2014

Aspen Aerogels, Inc. to Present at Barclays CEO Energy-Power Conference August 27th, 2014

Nanotech Security Corp. to Acquire Fortress Optical Features Ltd., a Leading Producer of Banknote Security Features August 27th, 2014

Malvern specialists to deliver inaugural short course on polymer characterization at Interplas 2014 August 27th, 2014

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals

The thunder god vine, assisted by nanotechnology, could shake up future cancer treatment: Targeted therapy for hepatocellular carcinoma using nanotechnology August 27th, 2014

Scientists craft atomically seamless, thinnest-possible semiconductor junctions August 26th, 2014

Competition for Graphene: Berkeley Lab Researchers Demonstrate Ultrafast Charge Transfer in New Family of 2D Semiconductors August 26th, 2014

Symphony of nanoplasmonic and optical resonators leads to magnificent laser-like light emission August 26th, 2014

Environment

New Nanosorbent Helps Elimination of Colorants from Textile Wastewater August 25th, 2014

Production of Toxic Ion Nanosorbents with High Sorption Capacity in Iran August 17th, 2014

PerkinElmer to Display Innovative Detection and Informatics Offerings at ACS National Meeting & Exposition Detection, Data Visualization and Analytics for Chemistry Professionals August 8th, 2014

Nature inspires a greener way to make colorful plastics July 30th, 2014

Photonics/Optics/Lasers

Competition for Graphene: Berkeley Lab Researchers Demonstrate Ultrafast Charge Transfer in New Family of 2D Semiconductors August 26th, 2014

Symphony of nanoplasmonic and optical resonators leads to magnificent laser-like light emission August 26th, 2014

Biomimetic photodetector 'sees' in color: Rice lab uses CMOS-compatible aluminum for on-chip color detection August 25th, 2014

Ultra-short pulse lasers & Positioning August 21st, 2014

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More














ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







© Copyright 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE