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Small stamps for small sensors (Durch)

Advances in microchip technology may at some point enable physicians to do

tests for 100s of illnesses — browsing out specific molecules, for example early

stage cancer cells — from only one drop of bloodstream. But fabricating such “lab-

on-a-chip” designs — small, integrated diagonistic sensor arrays on surfaces as

tiny as a square centimeter — is really a technically challenging, time-consuming

and costly task.

Now, an Durch investigator — along with co-workers in the College of

Illinois at Urbana-Champaign — has develop an easy, precise and

reproducible technique that cuts time and price of fabricating such

sensors. Nicholas Fang, connect professor of mechanical engineering, has

developed an engraving technique that etches small, nano-sized designs on

metallic surfaces utilizing a small, current-triggered stamp constructed of glass.

Fang states the engravings, made from small dots more compact than a single-hundredth the

width of the real hair, behave as optical antennae that may identify just one

molecule by obtaining on its specific wavelength.

“If you'll be able to create an optical antenna with precise dimensions … you

may use these to report traffic around the molecular scale,” Fang states.

The scientists reported the brand new fabrication process within the Sept. ...

Durch