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Science & Tech.
Pradeep Kumar

06/10/21 11:15 AM IST

Scalable synthesis method developed of Nano-crystals

In news

Indian researchers have developed a method that can help large scale synthesis of a special class of semiconductor nanocrystals.

Details
  • These nanocrystals called two-dimensional layered perovskite and perovskite nanocrystals, which have bright emission colours and are not affected by or corroded by the environment, are useful for both high colour purity and low-cost solution processability.
  • Nanomaterials have unique properties compared to their bulk counterpart as they exhibit bright emission and are useful for light-emitting diodes (LED) apart from several other applications in our day-to-day life.
  • However, large-scale syntheses of such materials are challenging as the reaction mechanism, and kinetics of large-scale syntheses are often different from small-scale syntheses.
  • Such large scale synthesis methods are necessary for industrial applications. 
The process of synthesis
  • A group of researchers at the Centre for Nano and Soft Matter Sciences (CeNS), an autonomous research institute under the Department of Science and Technology (DST), have synthesized two-dimensional layered perovskite and perovskite nanocrystals by a method called sonochemical process that is often used for large scale synthesis.
  • This process utilizes the principles of sonochemistry to make molecules undergo a chemical reaction with the application of powerful ultrasound radiation.
Findings
  • The team tracked how these nanomaterials grow during the reaction.
  • They controlled reaction parameters, such as time and temperature, to tune the dimensionality of these nanomaterials and their emission colours.
  • The researchers showed that at an early stage of reaction, two-dimensional layered perovskites form, and they get converted to perovskite nanocrystals controllably.
  • They also demonstrated a white-light-emitting diode with the mixture of these perovskites.
  • Further works are in progress by the CeNS team to increase the stability of these nanomaterials.
Source: PIB

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