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Monday, 13th August 2007 (4818 views)

Researchers have discovered that gold nanoparticles can be directly deposited on to silicon substrates.

In a study published by scientific journal Langmuir, scientists from Northwestern University discovered that a third-generation nanofountain probe (NFP) can deposit gold nanoparticles onto silicon substrates.

Developed by a group led by Horacio D Espinosa, NFPs are cantilevered probe chips that are able to be mounted on commercial atomic force microscopy equipment.

Liquid inks such as nanopoarticle solutions are held by on-chip reservoirs and delivered to ring-shaped apertured tips - an effective medium for the process of molecule delivery.

"The ultimate goal of this project is to develop a robust microsystem platform for the mass production of nanoscale devices, sensors and structures using chemicals, biomolecules, nanoparticles, nanotubes and nanowires," said Mr Espinosa.

"Such a direct-write method of deposition provides better control over resultant patterns and simplifies the process of fabricating functional structures, as compared to conventional photolithographic or microstamping techniques," he explained.

Meanwhile, according to a report in Chemical Science, scientists at the University of Massachusetts recently discovered that nanoparticles with flexible side chains can persuade peptides to adopt a helical shape, increasing their abilities as anti-cancer agents.

 

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