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Carbon for quantum dots

20.03.2021

Fluorescent semiconductor particles less than 10 nm in diameter, called quantum dots, are used in various medical and electronic technologies. The problem is that easy-to-make carbon-based dots emit less light than those made from toxic and expensive metals.

A new study by scientists from the University of Urbana-Champagne (Illinois) shows that not all carbon dots are mediocre sources of radiation. Experts suggest that by choosing only "super-emitters" from them, such a purified population of carbon dots can be proposed as an alternative to quantum dots of toxic metals in many applications.

By combining their previously developed absorption scanning tunneling microscope with the capability of femtosecond time resolution, the researchers were able to detect quantum dots in an excited state for the first time.

"We found that in large populations, approximately 20% of carbon nanodots are ideal emitters, while about 80% emit heat after a very short period of light emission," said chemistry professor Martin Gruebele, who led the study.

The new imaging technique also makes it possible to see why some dots never light up, raising hope that perfect light-emitting carbon dots could someday be synthesized.

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Basically, the DT7837 is a noise and vibration signal analyzer that uses an ARM processor to process the data. The module has four 24-bit IEPE input channels that can be read at a sampling rate of 102,4 ksample per second. The device runs under the open operating system Linux 3.12, which is available to customers in the form of source codes. This allows you to tailor the module to the requirements of a specific task and create specialized applications for embedded solutions based on the DT7837. The module is said to be well suited for precise measurements using microphones, accelerometers and other transducers with a wide dynamic range.

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