Nanoparticle Chemical Sensors for UUXO Detection Christian Schoen, PhD VP CTO Concurrent Analytical Inc. Partnership Workshop: Robotic Technology To Support.

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Presentation transcript:

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 In conjunction with Sea Engineering, funded by CEROS to develop UUXO detection systems Kahoolawe coast

Define Goals Analyzed seawater off Kahoolawe Proximal to leaky explosive – Was able to measure 40 ppm close, 1 5 meters – 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 Optical transducer based on antibody/antigen mechanisms Benefits: 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: Disadvantages: – Not directional – passive system UUXO Optical Transducer

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

Sprayjet TM 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