Researchers develop sensor to detect nanoplastics in the air

Researchers have developed a sensor that detects nanoplastics in the air, determining their types, amounts and sizes.

Plastics can break down into nanosized particles that often find their way into the soil, water and air.

It is unclear how nanoplastics impact human health, but animal studies suggest they are potentially harmful.

‘Nanoplastics are a major concern if they’re in the air that you breathe, getting into your lungs and potentially causing health problems,’ said Raz Jelinek, Ph.D., the project’s principal investigator. ‘A simple, inexpensive detector like ours could have huge implications, and someday alert people to the presence of nanoplastics in the air, allowing them to take action.’

Millions of tons of plastic are produced and thrown away each year. Some plastic materials slowly erode while they’re being used or after being disposed of, polluting the surrounding environment with micro- and nanosized particles.

Nanoplastics are so small — generally less than 1-µm wide — and light that they can even float in the air, where people can then unknowingly breathe them in.

Animal studies suggest that ingesting and inhaling these nanoparticles may have damaging effects. Therefore, it could be helpful to know the levels of airborne nanoplastic pollution in the environment.

white plastic bottle lot

Previously, Jelinek’s research team at Ben-Gurion University of the Negev developed an electronic nose or “e-nose” for monitoring the presence of bacteria by adsorbing and sensing the unique combination of gas vapor molecules that they release.

The researchers wanted to see if this same carbon-dot-based technology could be adapted to create a sensitive nanoplastic sensor for continuous environmental monitoring.

Carbon dots are formed when a starting material that contains lots of carbon, such as sugar or other organic matter, is heated at a moderate temperature for several hours, says Jelinek.

This process can even be done using a conventional microwave. During heating, the carbon-containing material develops into colorful, and often fluorescent, nanometer-size particles called “carbon dots.” And by changing the starting material, the carbon dots can have different surface properties that can attract various molecules.

To create the bacterial e-nose, the team spread thin layers of different carbon dots onto tiny electrodes, each the size of a fingernail.

They used interdigitated electrodes, which have two sides with interspersed comb-like structures. Between the two sides, an electric field develops, and the stored charge is called capacitance.

‘When something happens to the carbon dots — either they adsorb gas molecules or nanoplastic pieces — then there is a change of capacitance, which we can easily measure,’ explained Jelinek.

In experiments, nanoscale plastic particles were aerosolized, making them float in the air. And when electrodes coated with carbon-dot films were exposed to the airborne nanoplastics, the team observed signals that were different for each type of material, says Jelinek.

Because the number of nanoplastics in the air affects the intensity of the signal generated, Jelinek adds that currently, the sensor can report the amount of particles from a certain plastic type either above or below a predetermined concentration threshold.

Additionally, when polystyrene particles in three sizes — 100-nm wide, 200-nm wide and 300-nm wide — were aerosolized, the sensor’s signal intensity was directly related to the particles’ size.

The team’s next step is to see if their system can distinguish the types of plastic in mixtures of nanoparticles.

Photo by Jonathan Chng


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