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Nanoparticle Chemical Sensors for UUXO Detection Christian Schoen, PhD VP CTO

Nanoparticle Chemical Sensors for UUXO Detection Christian Schoen, PhD VP CTO Concurrent Analytical Inc. Partnership Workshop: Robotic Technology To Support Underwater Unexploded Ordnance (UUXO) Ops Friday, 10 Oct Hilton Hawaiian Village, Waikiki. CEROS Funded Effort.

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Nanoparticle Chemical Sensors for UUXO Detection Christian Schoen, PhD VP CTO

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  1. Nanoparticle Chemical Sensors for UUXO Detection • Christian Schoen, PhD • VP CTO • Concurrent Analytical Inc. • Partnership Workshop:Robotic Technology To Support Underwater Unexploded Ordnance (UUXO) Ops • Friday, 10 Oct Hilton Hawaiian Village, Waikiki

  2. CEROS Funded Effort • In conjunction with Sea Engineering, funded by CEROS to develop UUXO detection systems • Kaho’olawe coast

  3. Define Goals • Analyzed seawater off Kaho’olawe • Proximal to leaky explosive • Was able to measure 40 ppm close, 1 ppm @ 5 meters • 1 ppt @ 1000 meters? • Chemical radiation from explosives does not occur in a hemispherical pattern UUXO plume

  4. How sensitive is this? • Sharks detect blood in seawater at 100 ppmillion • 1 ppm = 1 drop in 50 liters

  5. Comparison • One part per trillion (1 ppt) is a proportion equivalent to one drop of water diluted into twenty olympic size swimming pools

  6. Detection System Requirements • Extremely sensitive (~ppt) • Fast (seconds) • Corrosion resistant • Biofouling resistant • Low power consuming/ remote stand alone operation • Directional?

  7. Solution: Optical Transducer • Optical transducer based on antibody/antigen mechanisms • Benefits: • Antibody/antigen interaction is very sensitive (used in diagnostic assays at similar sensitivity requirements) • Optical systems can be made to be robust in ocean environments • Optical systems can be made to be remotely operable/low power • Disadvantages: • Not directional – passive system Optical Transducer UUXO

  8. Gold Nanorods • Geometrically-tunable plasmon resonance throughout visible/NIR • Highly monodisperse, scalable manufacturing method • Potential as multimodal agents for sensors • Polymer coated gold is extremely robust in corrosive environments

  9. Simple

  10. How Sensitive/Selective? • Work to ppt • Using Raman labels is 1,000,000x better • Can work with multiple target concurrently • Problem:

  11. SprayjetTM Solution

  12. How much quicker? • Current SOTA is 30 minutes to 2 days • For ppt, sprayjet can work in a few seconds at many ml per sec.

  13. Conclusion • Optical Transducers, particularly plasmonic gold nanorods, can be used as a robust sensor for UUXOs

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