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Researchers find technique for 3-D printing on nanoscale that can correct mistakes

University of Dayton physics and electro-optics researchers Md Shah Alam, Qiwen Zhan and Chenglong Zhao have created a less expensive 3-D printing method on a nanoscale, or a thousand times smaller than a human hair, that can manufacture nanostructures and erase mistakes. Top nanotechnology journal Nano Letters published their findings.

3-D printing has been used widely by engineers and designers for years for the rapid prototyping of custom projects, but until now, 3-D printing on a nanoscale was costly, challenging and difficult to correct manufacturing mistakes.

"This nano-version 3-D printing technology fills this gap by providing engineers an affordable manufacturing tool for the fabrication of nanostructures and devices, which has become increasingly important for applications that are enabled by nanotechnology," said Zhao, an assistant professor of physics and electro-optics. 

The research team found this process to be less expensive than commonly available nanofabrication techniques that need to be conducted in a vacuum. This new technology utilizes a low-cost laser, such as a laser pointer used in presentations, to transfer nanoparticles from one surface and assemble them on nanodevices on another surface.  

Also as important, this technology allows users to correct fabrication errors that occur during the manufacturing process, Alam, a graduate student of electro-optics, added. 

"Manufacturing error correction is extremely important to reduce manufacturing cost and increase the success rate of a production line," said Zhan, a professor of electro-optics. "For example, before, if a tiny manufacturing error is found in an electronic chip, the entire chip has to be discarded. This technology will enable us to correct manufacturing errors even after manufacturing."

Visit Nano Letters to read about the research team's complete findings. For more information, email Zhao at

For interviews, contact Shawn Robinson, University of Dayton associate director of news and communications, at


News and Communications Staff