Writing at the Nanoscale: 'Electro Pen' may impact a host of developing nanotechnologies

August 29, 2005
'Electro Pen' may impact a host of developing nanotechnologies

At the U.S. Department of Energy's Brookhaven National Laboratory, scientists have developed a new chemical "writing" technique that can create lines of "ink" only a few tens of nanometers, or billionths of a meter, in width.

Image: "Written" with the Electro Pen, the lines forming these words are 150 nanometers wide and less than one nanometer high. They are made of organic molecules.

"Our new 'writing' method opens up many new possibilities for creating nanoscale patterns and features on surfaces. This may have a significant impact on developing nanotechnologies that involve nanopatterning, such as molecular electronics -- tiny circuits built using single organic molecules," said Brookhaven Lab physicist Yuguang Cai. Cai will discuss the method at the 230th American Chemical Society national meeting in Washington, D.C., on Sunday, August 28, at 12 p.m. in room 8-9 of the Renaissance Hotel.

Cai and his colleagues call the technique "Electro Pen Nanolithography" (EPN). They sweep a very thin metal tip across a film of organic molecules. The tip carries an electric voltage, which causes the region under it to "oxidize," or undergo a reaction that changes the chemical makeup of the film. In a single sweep of the pen, organic "ink" molecules are transferred from the tip to the oxidized regions, creating an extremely thin line.

Physicists Benjamin Ocko (L) and Yuguang Cai.
Physicists Benjamin Ocko (L) and Yuguang Cai.

Each line is just one molecule thick, but the researchers can produce multilayered patterns by writing over the existing pattern. This gives them the ability to create three-dimensional nanoscale "landscapes." Moreover, by turning off the voltage, they can use the tip as a tiny "scanner" to "read" and create an image of the pattern just written.

With further research, EPN may have the ability to "write" biomolecular materials, such as proteins, onto surfaces. These nanoscale protein deposits might, for example, serve as biosensors.

This research is supported by the Office of Basic Energy Sciences within the U.S. Department of Energy's Office of Science.

Explore further: Why we're smarter than chickens: Team uncovers protein part the controls neuron development

Related Stories

Composting program cuts emissions equivalent to 7000 cars

August 10, 2015

When most people put their green-topped wheelie bin out for collection, they would not expect their general household waste to end up as compost, but an innovative Perth recycling facility has been making the conversion for ...

Ants as a model of complex societies

August 5, 2015

In small plastic tubs lining the shelves of a basement laboratory at the University of Pennsylvania, a million organisms live in complex societies.

Recommended for you

Interactive tool lifts veil on the cost of nuclear energy

August 24, 2015

Despite the ever-changing landscape of energy economics, subject to the influence of new technologies and geopolitics, a new tool promises to root discussions about the cost of nuclear energy in hard evidence rather than ...

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.