HomeProjectsSustainable Development and Green TechnologiesHigh Sensitive and Selectivity Plasmonic Systems for Ultrafine Particulate Matter (PM) 0.1 and 0.3 Detection

High Sensitive and Selectivity Plasmonic Systems for Ultrafine Particulate Matter (PM) 0.1 and 0.3 Detection

Project Quick Facts

Principal Investigator

  • Prof. ONG Hock Chun Daniel

    Department of Physics

  • Funding

    Innovation and Technology Commission

  • Patent

    1 US provisional patent application

Particulate matter 0.1 and 0.3 are influential to human health and the environment. Particularly, most viruses including COVID-19 have sizes ranging from 0.1 to 0.3 um and are difficult to be detected by current PM sensors.  We have developed the plasmon-mediated light scattering effect to improve the performance of PM sensors.  Metallic nanostructures at low cost have been prepared and integrated into conventional PM sensors to enhance their efficiency by 10 times, leading to the detection limit lower than 1 μg/m3 for 0.1 and 0.3 particulates.

Surface plasmon periodic arrays fabricated by interference lithography. The large area array, with length ~1.5 cm, is very uniform: when viewed at different angles, the color is almost the same across the entire sample.
Real time detection of different PM sizes. DI water without PM particulates (Top); 0.1 PM particulates (Middle); 0.3 PM particulates (Bottom).

Uniqueness and Competitive Advantages:

  • Capable of detecting small PM sizes down to 0.1 um
  • Possible integration to current light scattering based PM sensing technology
  • Real time detection (less than 5 min)
  • Portable and cost-effective

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