Alphagalileo > Item Display
en-GBde-DEes-ESfr-FR

Energy-harvesting nanomaterials created cool


A low-temperature method for making high-performance thermoelectric materials could recapture lost energy.

Some of the vast amount of wasted energy that machines and devices emit as heat could be recaptured using an inexpensive nanomaterial developed at KAUST. This thermoelectric nanomaterial could capture the heat lost by devices, ranging from mobile phones to vehicle engines, and turn it directly back into useful electricity.

The nanomaterial is made using a low-temperature solution-based production process, making it suitable for coating on flexible plastics for use almost anywhere.

“Among the many renewable energy sources, waste heat has not been widely considered,” says Mohamad Nugraha, a postdoctoral researcher in Derya Baran's lab. Waste heat emitted by machines and devices could be recaptured by thermoelectric materials. These substances have a property that means that when one side of the material is hot and the other is cold, an electric charge builds up along the temperature gradient.

Until now, thermoelectric materials have been made using expensive and energy-intensive processes. Baran, Nugraha and their colleagues have developed a new thermoelectric material made by spin coating a liquid solution of nanomaterials called quantum dots.

The team spin coated a thin layer of lead-sulphide quantum dots on a surface and then added a solution of short linker ligands that crosslink the quantum dots together to enhance the material’s electronic properties.

After repeating the spin-coating process layer by layer to form a 200-nanometer-thick film, gentle thermal annealing dried the film and completed fabrication. “Thermoelectric research has focused on materials processed at very high temperatures, above 400 degrees Celsius,” Nugraha says. The quantum-dot-based thermoelectric material is only heated up to 175 degrees Celsius. This lower processing temperature could cut production costs and means that thermoelectric devices could be formed on a broad range of surfaces, including cheap flexible plastics.

The team’s material showed promising thermoelectric properties. One important parameter of a good thermoelectric is the Seebeck coefficient, which corresponds to the voltage generated when a temperature gradient is applied. “We found some key factors leading to the enhanced Seebeck coefficient in our materials,” Nugraha says.

The team was also able to show that an effect called the quantum confinement, which alters a material’s electronic properties when it is shrunk to the nanoscale, was important for enhancing the Seebeck coefficient. The discovery is a step toward practical high-performance, low-temperature, solution-processed thermoelectric generators, Nugraha says.

URL to release: https://discovery.kaust.edu.sa/en/article/838/energy-harvesting-nanomaterials-created-cool

Video file attached to this email. Caption:

A low-temperature method for enabling high-performance thermoelectric materials to recapture lost energy.

Reference:

Nugraha, M.I., Kim, H., Sun, B., Haque, M.A., de Arquera, F.P.G., Villalva, D.R., El-Labban, A., Sargent, E.H., Alshareef, H.N. & Baran, D. Low-temperature-processed colloidal quantum dots as building blocks for thermoelectrics. Advanced Energy Materials 4, (2019)
Attached files
  • Mohamad Nugraha (left) and his group leader, Derya Baran, demonstrate the flexibility of the device.© 2019 KAUST
  • Mohamad Nugraha (left) and his group leader, Derya Baran, demonstrate the flexibility of the device.© 2019 KAUST
  • Energy-harvesting nanomaterials created cool.mp4
Regions: Middle East, Saudi Arabia
Keywords: Applied science, Nanotechnology, Technology, Science, Energy

Testimonials

We have used AlphaGalileo since its foundation but frankly we need it more than ever now to ensure our research news is heard across Europe, Asia and North America. As one of the UK’s leading research universities we want to continue to work with other outstanding researchers in Europe. AlphaGalileo helps us to continue to bring our research story to them and the rest of the world.
Peter Dunn, Director of Press and Media Relations at the University of Warwick
AlphaGalileo has helped us more than double our reach at SciDev.Net. The service has enabled our journalists around the world to reach the mainstream media with articles about the impact of science on people in low- and middle-income countries, leading to big increases in the number of SciDev.Net articles that have been republished.
Ben Deighton, SciDevNet
AlphaGalileo is a great source of global research news. I use it regularly.
Robert Lee Hotz, LA Times

We Work Closely With...


  • BBC
  • The Times
  • National Geographic
  • The University of Edinburgh
  • University of Cambridge
Copyright 2021 by DNN Corp Terms Of Use Privacy Statement