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Home»News»Neatly arranging crystal growth to make fine thin films
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Neatly arranging crystal growth to make fine thin films

August 27, 2024No Comments2 Mins Read
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Neatly arranging crystal growth to make fine thin films
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The metal-organic framework thin film synthesized at top did not involve a modulator, while the finely arranged version above did. Credit: Osaka Metropolitan University

Table salt and refined sugar look white to our eyes, but that is only because their individual colorless crystals scatter visible light. This feature of crystals is not always desirable when it comes to materials for optical and electrical devices, however.

Metal-organic frameworks are one such material. Crystalline with micropores, thin films of these nanomaterials have been attracting attention as a next-generation material that could also have an impact on environmental issues such as hydrogen storage and carbon dioxide capture.

An Osaka Metropolitan University Graduate School of Engineering team has found a way to control the growth of crystals on such thin films so that light scattering is reduced significantly.

The findings were published in Nanoscale.

Associate Professor Kenji Okada and Professor Masahide Takahashi led the team in developing a technique for forming thin films on substrates by having the crystals grow in an orderly manner through the use of a modulator. A mixture of diluted acetic acid, the main acid of vinegar, and sodium acetate made up the modulator, which interacted with the copper-based medium to grow crystals in only one direction.

By arranging the crystals neatly without gaps, the team succeeded in fabricating a thin film of unprecedented high quality.

“The thin films fabricated in this research have numerous molecular-sized pores that allow light to pass through them well,” Professor Okada explained. “They are expected to be used as optical sensors, optical elements, and transparent gas adsorption sheets that utilize the change in optical properties during molecular adsorption.”

Provided by
Osaka Metropolitan University


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