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Home » News

Researchers hack a 3D printer to speed up fabrication of bioelectronics

News By AM Chronicle EditorMarch 2, 20242 Mins Read
researchers hacked a 3
Ph.D. student Lee-Lun Lai loads a tray into a 3D microprinter to demonstrate how polymer transistors can be made faster, cheaper and more sustainably. Credit: David Callahan-KTH Royal Institute of Technology
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The speed of innovation in bioelectronics and critical sensors gets a new boost with the unveiling of a simple, time-saving technique for the fast prototyping of devices.

A research team at KTH Royal Institute of Technology and Stockholm University reported a simple way to fabricate electrochemical transistors using a standard Nanoscribe 3D micro printer. Without cleanroom environments, solvents, or chemicals, the researchers demonstrated that 3D micro printers could be hacked to laser print and micropattern semiconducting, conducting, and insulating polymers.

Anna Herland, professor in Micro- and Nanosystems at KTH, says the printing of these polymers is a key step in prototyping new kinds of electrochemical transistors for medical implants, wearable electronics and biosensors.

The technique could replace time-consuming processes that require an expensive cleanroom environment. Nor would it involve solvents and developer baths that have a negative environmental impact, says the study’s co-author Erica Zeglio, a faculty researcher with Digital Futures, a research center jointly operated by KTH Royal Institute of Technology and Stockholm University.

“Current methods rely on expensive and unsustainable cleanroom practices,” Zeglio says. “The method we proposed here doesn’t.”

Polymers are core components of many bioelectronic and flexible electronic devices. The applications are diverse, including monitoring living tissues and cells and diagnosing diseases in point-of-care testing.

“Fast prototyping of these devices is time-consuming and costly,” Herland says. “It hinders the widespread adoption of bioelectronic technologies.”

Using ultrafast laser pulses, the new method creates possibilities for the rapid prototyping and scaling of microscale devices for bioelectronics, says co-author and KTH Professor Frank Niklaus. The method could also be used for the patterning of other soft electronic devices, he says. The team applied the new method to fabricate complementary inverters and enzymatic glucose sensors.

Herland says the method could advance research in bioelectronic devices and significantly shorten the time-to-market.

“This also creates the possibility of replacing some of the current components with cheaper and more sustainable alternatives,” she says.

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