Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Gold-tipped nanocrystals developed by Hebrew University researchers

18.06.2004



“Nanodumbells” – gold-tipped nanocrystals which can be used as highly-efficient building blocks for devices in the emerging nanotechnology revolution – have been developed by researchers at the Hebrew University of Jerusalem.

The technology, developed by a research group headed by Prof. Uri Banin of the Department of Physical Chemistry and the Center for Nanoscience and Nanotechnology of the Hebrew University, is described in an article in the current issue of Science magazine.

The nanodumbells – shaped somewhat like mini-weightlifting bars – offer a solution to problems of building new, nanocrystal transistors, the basic component of computer chips.



Semiconductor nanocrystals are tiny particles with dimensions of merely a few nanometers. A nanometer (nm) is one-billionth of a meter, or about a hundred-thousandth of the diameter of a human hair. These nanocrystals exhibit unique optical and electrical properties that are controlled by modifying their particle size, composition and shape, creating promising building blocks for future nanotechnology devices, such as mini-computers, nanosensors for chemical and biological molecules, novel solar-cell devices, or for various biomedical applications.

The challenge that lies ahead in adapting these nanocrystals to real-world application lies in wiring them to operate in electronic circuits. How, in the manufacturing process, will it be possible to join billions of them together and incorporate them into a single, integrated, electrical circuit? Another problem is that of establishing good electrical contact in order to ensure speedy and faultless channels of communication.

The new technology developed by Prof. Banin and his team provides the solution to these two limiting problems. They succeeded in attaching gold tips onto nanorods by a simple chemical reaction. The resultant structure resembles a nanodumbbell, in which the central, nanocrystal, semiconductor part of the rod is linked via a strong chemical bond to the gold tips. These nanodumbbells provide strong chemical bonds between the gold and the semiconductor, leading to good electrical connectivity. This provides the path towards solving the problem of wiring the nanocrystals intro electrical circuitry.

The chemical bonding quality of the gold also helps solve the difficulties involved in manufacturing simultaneously up to billions of circuits. By adding to the nanodumbbell solution specific “linker” molecules, the gold tips are attracted to each other, thus creating self-assembling chain structures of nanocrystals, linked end-to-end. This strategy can serve as the basis for future manufacturing that will connect billions of nanorods to nanoelectronic circuitry. It is also possible to create other shapes, such as tetrapods, in which four arms expand from a central unit, making gold-tipped “anchor” points for different forms of self-assembly and wiring. This development will speed up the integration of semiconductor nanorods and tetrapods into real-world nanoelectronic applications.

Jerry Barach | University of Jerusalem
Further information:
http://www.huji.ac.il

More articles from Power and Electrical Engineering:

nachricht Engineers program tiny robots to move, think like insects
15.12.2017 | Cornell University

nachricht Electromagnetic water cloak eliminates drag and wake
12.12.2017 | Duke University

All articles from Power and Electrical Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: First-of-its-kind chemical oscillator offers new level of molecular control

DNA molecules that follow specific instructions could offer more precise molecular control of synthetic chemical systems, a discovery that opens the door for engineers to create molecular machines with new and complex behaviors.

Researchers have created chemical amplifiers and a chemical oscillator using a systematic method that has the potential to embed sophisticated circuit...

Im Focus: Long-lived storage of a photonic qubit for worldwide teleportation

MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.

Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...

Im Focus: Electromagnetic water cloak eliminates drag and wake

Detailed calculations show water cloaks are feasible with today's technology

Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...

Im Focus: Scientists channel graphene to understand filtration and ion transport into cells

Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.

To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...

Im Focus: Towards data storage at the single molecule level

The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.

Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

See, understand and experience the work of the future

11.12.2017 | Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

AKL’18: The opportunities and challenges of digitalization in the laser industry

07.12.2017 | Event News

 
Latest News

Engineers program tiny robots to move, think like insects

15.12.2017 | Power and Electrical Engineering

One in 5 materials chemistry papers may be wrong, study suggests

15.12.2017 | Materials Sciences

New antbird species discovered in Peru by LSU ornithologists

15.12.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>