Nanoparticle Chemical Sensors for UUXO Detection Christian Schoen, PhD VP CTO Concurrent Analytical...
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Transcript of Nanoparticle Chemical Sensors for UUXO Detection Christian Schoen, PhD VP CTO Concurrent Analytical...
Nanoparticle Chemical Sensors for UUXO Detection
Christian Schoen, PhDVP 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
• In conjunction with Sea Engineering, funded by CEROS to develop UUXO detection systems
• Kaho’olawe coast
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
How sensitive is this?
• Sharks detect blood in seawater at 100 ppmillion
• 1 ppm = 1 drop in 50 liters
Comparison
• One part per trillion (1 ppt) is a proportion equivalent to one drop of water diluted into twenty olympic size swimming pools
Detection System Requirements
• Extremely sensitive (~ppt)• Fast (seconds)• Corrosion resistant• Biofouling resistant• Low power consuming/ remote stand alone operation• Directional?
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
UUXOOptical Transducer
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
Simple
How Sensitive/Selective?
• Work to ppt • Using Raman labels is 1,000,000x better• Can work with multiple target concurrently• Problem:
SprayjetTM Solution
• Current SOTA is 30 minutes to 2 days• For ppt, sprayjet can work in a few seconds at many
ml per sec.
How much quicker?
Conclusion
• Optical Transducers, particularly plasmonic gold nanorods, can be used as a robust sensor for UUXOs