New Technique for Directly Writing Composites of Nanoparticles and Polymers

Scientists at the Naval Research Laboratory and the University of Illinois-Urbana Champaign recently reported a new technique for directly writing composites of nanoparticles and polymers.

The heated probe of an atomic force microscope melts a nanoparticle-polymer composite enabling it to flow onto a surface. The nanocomposite can be used as-is or the nanoparticles released with an oxygen plasma. (Image courtesy of UIUC and NRL.)

Recent years have seen significant advances in the properties achieved by both these materials, and so researchers have begun to blend these materials into nanocomposites that access the properties of both materials. Forming these nanocomposites into structures has been tricky since each nanocomposite would require a particular set of solvents or a particular surface coating. To solve this problem, the NRL and UIUC team developed a generic means for depositing many nanocomposites on multiple surfaces with nanoscale precision. Metal nanoparticles that were conducting, tiny magnetic nanoparticles, and nanoparticles that glowed, were all deposited using this one technique.

The technique builds on previous work using atomic force microscopy (AFM) probes as pens to produce nanometer-scale patterns. The polymer-nanocomposite blend is coated onto the probe. When the probe is heated, it acts like a miniature soldering iron to deposit the nanocomposite. "This technique greatly simplifies nanocomposite deposition," said Paul E. Sheehan, head of the Surface Nanoscience and Sensor Technology Section at NRL in Washington, D.C. "No longer do you have to spend half a year tweaking the chemistry of the surface or nanocomposite to achieve deposition."

The technique also solves a common problem when depositing soft materials like polymers and nanocomposites. The solvents and patterning procedures for depositing soft materials can damage any soft material already deposited. Consequently, it can be quite difficult to deposit many different such materials. "Our ability to control nanometer-scale heat sources allows local thermal processing of these nanocomposites," says William King, Kritzer Faculty Scholar in the Department of Mechanical Science and Engineering at the University of Illinois Urbana-Champaign. This opens a door to the direct writing of highly complex structures.

Although the nanoparticles were typically dispersed throughout the nanocomposite, the researchers found that by adjusting the nanoparticle chemistry they could force the nanoparticles into alignment. "With the right chemistry, the forces in the polymer will guide the nanoparticles into thin rows." Rows of nanoparticles less than 10 nm wide were written, narrower than any other direct write technique. The string of magnetic nanoparticles should be useful for studying magnetic interactions on the smallest scales. "Combining with our nanolithographic technique these tiny magnetic nanostructures can be added to current electronic or MEMS devices to enhance their capabilities." says Woo Kyung Lee. "These capabilities and those of the other nanocomposites may find novel applications from microelectronics to biomedical devices."

The technique was published on January 13th, 2010, in the journal Nano Letters. The research was sponsored by the Defense Advanced Research Projects Agency (DARPA).

Tell Us What You Think

Do you have a review, update or anything you would like to add to this news story?

Leave your feedback
Your comment type
Submit

While we only use edited and approved content for Azthena answers, it may on occasions provide incorrect responses. Please confirm any data provided with the related suppliers or authors. We do not provide medical advice, if you search for medical information you must always consult a medical professional before acting on any information provided.

Your questions, but not your email details will be shared with OpenAI and retained for 30 days in accordance with their privacy principles.

Please do not ask questions that use sensitive or confidential information.

Read the full Terms & Conditions.