Open menu

Nanotechnology Spotlight

Behind the buzz and beyond the hype:
Our Nanowerk-exclusive feature articles

Showing Spotlights 17 - 24 of 372 in category Fabrication Technologies and Devices (newest first):

 

On route to building flexible high-performance computers

flexible_waferNotwithstanding the red-hot research area of flexible electronics, today's state-of-the-art electronic devices rely on rigid and brittle mono-crystalline silicon based transistors which are unmatched with regard to low-cost production, high-performance computing, and ultra-low power consumption. Researchers have now developed a low-cost generic batch process using a state-of-the-art CMOS process to transform conventional silicon electronics into flexible and transparent electronics while retaining its high-performance, ultra-large-scale-integration density and cost.

Posted: Sep 11th, 2013

Vault particles as a nanotechnology platform

vault_particleVault particles are large, barrel-shaped nanoparticles found in the cytoplasm of all mammalian cells. All human cells so far analyzed have been shown to contain vaults with quantities varying from a few thousand per cell to in excess of 100 000 per cell. As naturally occurring nanoscale capsules, vaults may be useful to engineer as therapeutic delivery vehicles. The particles can be produced in large quantities and are assembled in situ from multiple copies of the single structural protein following expression. Using molecular engineering, recombinant vaults can be functionally modified and targeted, and their contents can be controlled by packaging.

Posted: Aug 19th, 2013

Biopolymer templated glass with a twist

chiral_silicaResearchers fabricated nanoporous glass films using nanocrystals of cellulose, the main component of pulp and paper. The unique, helical structure of cellulose is replicated in a mineral. This helical organization synthetically mimics the structure of the exoskeletons of some iridescent beetles. Introducing porosity into photonic crystals provides a means to tune their optical properties by infiltrating the pores with various guests: When certain liquids are added to the film, the liquid gets trapped in the pores and changes the optical properties of the films.

Posted: Aug 15th, 2013

How squid and octopus might point the way to nanotechnology-based stealth coatings

octopusFor a long time, scientists have been fascinated by the dramatic changes in color used by marine creatures like squids and octopuses, but they never quite understood the mechanism responsible for this. Only recently they found out that a neurotransmitter, acetylcholine, sets in motion a cascade of events that culminate in the addition of phosphate groups to a family of unique proteins called reflectins. Having begun to unravel the natural mechanisms behind these amazing abilities, researchers are trying to use this knowledge to make artificial camouflage coatings. New work addresses the challenge of making something appear and disappear when visualized with standard infrared detection equipment.

Posted: Aug 12th, 2013

Will it be possible someday to build a 'Fab-on-a-Chip'?

MEMS_structureSemiconductor fabs are large, complex industrial sites with costs for a single facility approaching $10B. In this article we discuss the possibility of putting the entire functionality of such a fab onto a single silicon chip. We demonstrate a path forward where, for certain applications, especially at the nanometer scale, one might consider using a single chip approach for building devices, both integrated circuits and nano-electromechanical systems. Such methods could mean shorter device development and fabrication times with a significant potential for cost savings.

Posted: Aug 8th, 2013

Atomic calligraphy - using MEMS to write nanoscale structures

MEMS_deviceOne of the most restricting parameters in nanofabrication is the difficulty involved with controllably patterning materials at precise locations in a repeatable manner over relatively large areas. A novel microelectromechanical system (MEMS)-based mask writer has now been developed by a team of researchers. The device allows to directly write structures at the nanoscale without the need to use photoresist, lift-off techniques or other complex and expensive approaches. The technique uses a MEMS plate with apertures drilled into it and a shutter so that one can, in effect, spray paint with atoms.

Posted: Jul 3rd, 2013

3D nanolithography without the expensive hardware

nano-volcanoWhile researchers are working on developing more cost-effective nanolithographic tools such as for instance superlens lithography, one of the key problems with nanofabrication is how to generate ever-challenging patterns with high resolution - especially for 3D nanostructures - and at the same time substantially reduce the cost of the process. A novel nanolithography method is based on light scattering from nanoparticles, which can generate 3D hollow-core structures that resembles 'nano-volcanoes'. Different from traditional lithography methods that are typically based on complex systems, this process relies solely on the light interaction with a single nanoparticle. No masks and external optics are needed in this approach, and light is manipulated into the desired optical pattern solely by the colloids.

Posted: Jun 24th, 2013

Capture and release of individual cancer cells with fractal nanostructures

fractal_nanostructureFractals are structures built up from repeated sizings of a simple shape to make a complex one. A fractal is a geometric structure that can repeat itself towards infinity. Zooming in on a fragment of it, the original structure becomes visible again. In biological systems, fractal structures can be found everywhere - bronchial trees, vasculature, and nerve cells. These amazing structures can provide a specific interfacial contact mode that is highly efficient for absorbing sunlight, transporting nutrition, exchanging oxygen and carbon dioxide, and signal transduction. Researchers have now demonstrated the fabrication of programmable fractal gold nanostructured interfaces and their outstanding specific recognition of rare cancer cells from whole blood samples along with their effective release capability.

Posted: Jun 13th, 2013