Microscope probe-sharpening technique improves resolution, durability

July 6, 2012
Joseph Lyding, a professor of electrical and computer engineering at the University of Illinois, led a group that developed a new microscope probe-sharpening technique. Credit: L. Brian Stauffer

(Phys.org) -- A simple new improvement to an essential microscope component could greatly improve imaging for researchers who study the very small, from cells to computer chips.

Joseph Lyding, a professor of electrical and at the University of Illinois, led a group that developed a new microscope probe-sharpening technique. The technique is described in research published this week in the journal Nature Communications.

Scanning probe microscopes provide images of with at the . The tip of the probe skims the surface of a sample to measure mechanical, electrical or chemical properties. Such microscopes are widely used among researchers who work with tiny structures in fields from to .

Labs can spend hundreds of thousands of dollars on an elegant instrument – for example, a scanning tunneling microscope (STM) or an atomic force microscope (AFM) – yet the quality of the data depends on the probe. Probes can degrade rapidly with use, wearing down and losing resolution. In such cases, the researcher then has to stop the scan and replace the tip.

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Joseph Lyding explains the new microscope probe sharpening process.

“To put it in perspective, if you had an expensive racecar but you put bicycle tires on it, it wouldn’t be a very good car,” Lyding said.

To shape tips, researchers shoot a stream of ions at the tip. The material sputters off as the ions collide with the tip, whittling away the probe. One day in the lab, after yet another tip failure, Lyding had the simple, novel idea of applying a matching voltage to the tip to deflect the incoming ions. When a voltage is applied to a sharp object, the electrical field gets stronger as the point narrows. Therefore, ions approaching the sharpest part of the electrified tip are deflected the most.

“This causes the ions to remove the material around that sharp part, not on the sharp part itself, and that makes it sharper,” Lyding said. “You preserve the point and you sharpen what’s around it.”

Lyding and graduate student Scott Schmucker purchased an inexpensive ion gun and tested Lyding’s idea. It worked beautifully. STM tips with a starting radius of 100 nanometers were honed to a sharp 1-nanometer point, yielding extremely high resolution. In addition, the sputtering process works with any electrically conductive material.

But once the probes are ultra-sharp, what’s to keep them from wearing down just as quickly as other probes? Lyding and Schmucker then teamed with U. of I. chemistry professor Gregory Girolami and materials science and engineering professor John Abelson, whose groups had demonstrated coatings for silicon semiconductors made of a material called hafnium diboride. The coatings are 10 times harder than the metal usually used to make STM tips, but are also metallic – the key property for the ion-sputtering process.

This is a traditionally etched tungsten STM probe (left), sharpened to a 1-nanometer point after bombarding it with ions (right). Credit: Joseph Lyding

The group applied the hafnium diboride coatings to their probes, sputtered them further, and found that the resulting probes are stable, durable and excel in the types of microscopy and patterning applications for which such tips are used.

“Nobody else makes probes with the combination of sharp, hard and metallic conduction,” said Lyding, who is also affiliated with the Beckman Institute for Advanced Science and Technology at the U. of I. “You can find one or the other but not all three. There’s a tremendous demand for that.”

The researchers now are moving to commercialize their tough, sharp probes. They received a patent and started a company called Tiptek to begin manufacture. They are also expanding their sharpening technique to include AFM probes as well as STM, and are developing batch-processing techniques for higher throughput.

“When people make AFM tips they make them on wafers, hundreds of tips at a time,” said Lyding. “The methodology that we’re developing lets us process this entire wafer as a unit so all 400 tips would be done at the same time.”

The Office of Naval Research, the Defense Advanced Research Project Agency and the National Science Foundation supported this work.

Explore further: Scientists prove graphene's edge structure affects electronic properties

More information: The paper, “Field-directed Sputter Sharpening for Tailored Probe Materials and Atomic-scale Lithography,” is available online.

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