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Friday, January 28, 2022

Graphene Speaks

 Material, syntheses in new contexts.

When Graphene Speaks, Scientists Can Now Listen

Rice University News, Mike Williams, January 19, 2022

Brothers John and Victor Li, working in the laboratory of Rice University's James Tour, analyzed laser-induced graphene (LIG) production in real time using sound. LIG produces layers of interconnected graphene sheets by heating the topmost polymer sheet to 2,500 degrees Celsius (4,532 degrees Fahrenheit), leaving only carbon atoms. John Li said different processes generate different sounds, "So if we hear variations during the synthesis, we'd be able to detect different materials being formed." The brothers formulated a simple acoustic signal processing framework to ascertain LIG's form and quality, which John said "allows us to efficiently scale the throughput of our analytical capabilities to the entire amount of material we're trying to synthesize in a robust manner." Tour said the brothers converted the sound pattern to numerical data via a Fast Fourier transform, which could analyze product type and purity near-instantaneously.  ... '

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