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Nanotechnology Spotlight

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

Showing Spotlights 1473 - 1480 of 1603 in category (newest first):

 

Quantum dot molecules - one step further towards quantum computing

Individual quantum dots (QDs) have been widely investigated for the past 15 years, showing their potential applications in quantum computing. However, individual QDs are not enough for practical applications, but preparing and characterizing groups of QDs with controllable crosstalk (quantum dot molecule) is very challenging still. University of Arkansas researchers discovered a simply way to fabricate QD pairs, the most simple QD molecule. This provides a unique opportunity to study carrier interaction among QDs, one step further towards quantum computing.

Posted: Aug 16th, 2006

A green synthesis technique for fabricating carbon-coated magnetic nanoparticles

Encapsulating metal nanoparticles inside carbon shells is of considerable significance but fraught with high manufacturing cost due to high energy consumption and intensive use of hardware. This cost issue limits their practical applications. Researchers in China have developed a novel, simple, efficient, and economical synthesis technique for the fabrication of carbon-encapsulated nanostructures where the carbonization is conducted at a relatively low temperature of 160C in water and no toxic reagents are added. This new technique is facile and versatile, and suitable for the coating of other transition metal with carbon.

Posted: Aug 15th, 2006

The effects of contamination during nanoparticle production

A new study by Swedish researchers shows that gold nano spheres with a diameter of 7 nm, produced in a conventional laboratory surrounding, activate human antigen presenting dendritic cells (DCs) to induce proliferation of peripheral blood mononuclear cells (PBMC), mixed with either allergenic or autologous DCs. This effect was found to be due to endotoxin (lipopolysaccharide, LPS) contamination of the nanoparticles. When particles were produced in a controlled way eliminating endotoxin contamination, the activation of the DCs did not take place.

Posted: Aug 14th, 2006

Towards multidimensional, multicomponent, and multifunctional nanomaterials

With the recent development in nanoscience and nanotechnology, a large variety of single-component nanomaterials (such as carbon nanotubes, nanoparticles, and quantum dots) and devices have been reported. There is now a pressing need to integrate multicomponent nanoscale entities into multifunctional systems and to connect these nano-systems to the micro/macro-world. This connection from the nano world to the macro world has been one of the long-standing problems in nanotechnology and still remains a big challenge. A novel approach of growing aligned carbon nanotubes (CNTs) around microsized carbon fibers should provide a useful platform technology for the development of various multidimensional and multifunctional nanomaterials and devices.

Posted: Aug 11th, 2006

A novel approach to making organic thin film transistors

Organic thin film transistors (OTFTs) based on have attracted a great deal of attention as they are the critical components to fabricate low cost and large area flexible displays and sensors for future application in organic electronics technology. However, the major problem to use organic thin film transistor in logic circuits is the high operating voltage required. Researchers in India believe this problem can be solved by using organic materials with high dielectric constant as gate dielectrics.

Posted: Aug 10th, 2006

Nanoparticles stabilize proteins

A new study presents a viable strategy to stabilize enzymes under conditions found in real world biocatalytic applications. This stabilization of proteins through gold nanoparticles occurs through two mechanisms: 1) binding of the protein in its active structure stabilizes that structure; 2) the gold particles lower the interfacial energy between air and water, thus diminishing the driving force for denaturation. The result is a functional biocatalyst that can be readily applied to biotechnological applications.

Posted: Aug 9th, 2006

Another nano consumer product gets negative attention in Germany

The discussion about the health scare caused by the Magic-Nano sealing spray (which, as it turned out, was neither magic nor nano - see this article) has barely ebbed when questions about another nano consumer product arise. This time, it is not a health scare but rather the opposite - alleged health benefits of nanoparticles.

Posted: Aug 8th, 2006

Towards molecular electronics

A potential solution to overcoming the fundamental scaling limits of silicon-based electronic circuitry is the use of a single molecular layer that self-organizes between two electrodes: so-called molecular electronics. Nature itself is highly efficient in using self-organized structures for electronic transport (photosynthesis in plants, nerve cells, etc.), and now similar self-organization of organic molecules is used to make electronic devices. Electric transport through single molecules has been studied extensively by both academic and industrial research groups. It has been demonstrated that the size of a diode, an element used in electronic circuitry, can be reduced reproducibly below 1.5 nm. Transport data, however, typically differ by many orders of magnitude and the fabrication hurdle is reliability and yield. Researchers in The Netherlands now have demonstrated a technology to manufacture reproducible molecular diodes with high yields (>95 %) with unprecedented lateral dimensions.

Posted: Aug 7th, 2006