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'Blinking" crystals may convert CO2 into fuels

The arrows point to titanium dioxide nanocrystals lighting up and blinking and then fading. @ Tewodros Asefa and Eliska Mikmekova

Imagine tiny crystals that "blink" like fireflies and can convert carbon dioxide, a key cause of climate change, into fuels.

A Rutgers-led team has created ultra-small titanium dioxide crystals that exhibit unusual "blinking" behavior and may help to produce methane and other fuels, according to a study in the journal Angewandte Chemie. The crystals, also known as nanoparticles, stay charged for a long time and could benefit efforts to develop quantum computers.

"Our findings are quite important and intriguing in a number of ways, and more research is needed to understand how these exotic crystals work and to fulfill their potential," said senior author Tewodros (Teddy) Asefa, a professor in the Department of Chemistry and Chemical Biology in the School of Arts and Sciences at Rutgers University-New Brunswick. He's also a professor in the Department of Chemical and Biochemical Engineering in the School of Engineering.

More than 10 million metric tons of titanium dioxide are produced annually, making it one of the most widely used materials, the study notes. It is used in sunscreens, paints, cosmetics and varnishes, for example. It's also used in the paper and pulp, plastic, fiber, rubber, food, glass and ceramic industries.

The team of scientists and engineers discovered a new way to make extremely small titanium dioxide crystals. While it's still unclear why the engineered crystals blink and research is ongoing, the "blinking" is believed to arise from single electrons trapped on titanium dioxide nanoparticles. At room temperature, electrons - surprisingly - stay trapped on nanoparticles for tens of seconds before escaping and then become trapped again and again in a continuous cycle.

The crystals, which blink when exposed to a beam of electrons, could be useful for environmental cleanups, sensors, electronic devices and solar cells, and the research team will further explore their capabilities.

A Blinking Mesoporous TiO2−x Composed of Nanosized Anatase with Unusually Long‐Lived Trapped Charge Carriers

Tao Zhang, Jingxiang Low, Jiaguo Yu, Alexei M. Tyryshkin, Eliška Mikmeková, Tewodros Asefa

Angewandte Chemie (22 May 2020)

DOI: 10.1002/anie.202005143

Contact information:

Tao Zhang

Rutgers doctoral student

Tewodros (Teddy) Asefa

Professor, Department of Chemistry and Chemical Biology, School of Arts and Sciences

Professor, Department of Chemical and Biochemical Engineering, School of Engineering

Phone: (848) 235-2970

Asefa Nanomaterials Research Group

Rutgers University

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