Chemical technology news from across RSC Publishing.
27 October 2008
Japanese researchers have developed a way of soldering metal wires together on the nanoscale. The method will open the door to applications in nanocircuitry, they claim.
The demand for ever-smaller electronics has generated a great deal of interest in electrical nanocircuits. The way nanowires are connected is of key importance when making stable nanocircuits, say Takaaki Toriyama and Tsutomu Ishiwatari of Shinshu University, Ueda, Japan - simply laying nanowires across each other is mechanically unstable.
The stable silver nanowire joints could potentially be used in nanoelectronics
The previous method for joining silver nanowires involved chemically reducing chloroauric acid to produce metallic gold particles. When Toriyama and Ishiwatari tried this, they found that the silver wires corroded. By first treating the wires with excess thiol, which protects the surface of the silver, and then with chloroauric acid, they avoided corrosion and created a permanent join between the nanowires.
- C N R Rao, Jawaharlal Nehru Centre for Advanced Scientific Research, India
Toriyama and Ishiwatari conclude that the newly developed method is 'superior to chemical reduction' and says that it holds promise as a way of soldering nanowires for electronics.
'Toriyama and Ishiwatari's method is simple and promises to be useful in device fabrication and other nanotechnology applications,' says C N R Rao, an expert in materials chemistry at the Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore, India.
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Link to journal article
Preparation of glue joints and bridges between Ag nanowires and their metallization. A possible method for nano-soldering
Takaaki Toriyama and Tsutomu Ishiwatari, J. Mater. Chem., 2008, 18, 5537
Also of interest
Fastening azide-functionalised gold nanoparticles onto modified DNA holds great promise for nanoscale electrical circuits, say German researchers
Toxins responsible for food poisoning can be detected using nanoscale transistors, claim US scientists.
C N Ram Rao
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