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