Printed Chem-Bio Sensor
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1 Printed Chem-Bio Sensor March 19 th, 2015 Dr. Judy Song, Senior Research Engineer Electro-Optical System Laboratory Georgia Tech Research Institute
2 Printed Chem-Bio Sensing Overview Nano-based sensing: RF, electrical and optical Electrochemical sensing Optical interferometric chem-bio sensing
3 Electro-Optical Systems Laboratory EOSL - 3 Motivation Long-term monitoring of chemical vapors Ammonia, Hydrazine, Chemical Warfare Agents, etc. Standoff detection Low vapor pressure of explosives requires high sensitivity 10 ppb for TNT, 10 ppt for Explosives (RDX, PETN) Deployed on buildings, vehicles, clothing, tickets Low cost, small size Technology in need by US DHS BAA 11-03, US Army, TSA, EPA, Healthcare, etc.
4 Nano-Based Sensing RF: carbon nanotubes/graphene Impedance: CNTs/graphene Optical: gold/titania/silica
5 Carbon Nanomaterial-based RFID Sensor Overview Benefits of carbon nano-materials for sensing Ambient temperature operation Low cost fabrication Specificity to particular gas (functionalization and/or sensor array ) Sensor reverts back once the reaction is complete Easy integration with electronics (antennas, RF modules) Standoff detection using wireless operation Passive (battery-free) sensor operation Small size, low-cost, no maintenance Interrogation distance up to 100 m + feasible Electro-Optical Systems Laboratory EOSL - 5
6 Gas Sensor (with 10-µm spacing) CNT/Graphene Sensing Tip 2 cm 4.5cm Aerosol jet printed CNT sensing film on pre-fabricated interdigitated electrodes (top); Wire-bonding completed sensor package (bottom). Microcontroller and Electronics 25.4-µm width electrodes 10-µm spacing between electrodes
7 Chemical Vapor Sensing
8 Microelectrode Array Impedance Based Detection 2 μm Gap 8 μm Gap 6 μm Gap 8
9 A Novel Sensor Integrating Paper Antennas & Printed CNTs GTRI developed an RF sensor that integrates a CNT sensor with an antenna When the CNT material is exposed to gas, the antenna resonance shifts due to impedance change Paper Substrate CNT loaded stub Detection is a measurement of the shift in resonance frequency Breadboard test connector measuring return loss Silver Ink (Inset-Fed Patch Antenna)
10 CNT Sensor Experimental Validation Paper Substrate Test connector measuring return loss CNT loaded stub Silver Ink (Patch Antenna) Detection of Ammonia Using Resonance Shift S11 (db) ppm NH3 After 300 MHz Before NH3 exposure After 3 minutes of NH3 After 10 minutes (revert) Before Revert Frequency (GHz) Low-Power Detection Using Reflected Signal, 300 MHz resonance shift (largest reported) CNT Dipole Sensor reverts itself NH 3 Source Passive Detection Using Back-scattered Signal Time Line of Passive Resonance Detection
11 Integration of CNT Detector with RFID IDC capacitance changes as a function of reaction and shifts the tank resonance The bandpass filter is tuned to the background signal and creates 1 upon rectification When the gas is detected, the filter is de-tuned which causes a 0 upon rectification Rectified signal drives an RFID chip for further processing
12 Electrochemical Sensing High Sensitivity and Selectivity Inherent Miniaturization Advanced Microfabrication Low Cost and Power Requirements Rapid Detection Easy to Use
13 CV Signatures for Explosives at Carbon Screen Printed Electrode Cyclic Voltammogram Signatures for 50 ppm TNT, 2-NT, RDX, PETN, DNT, DNB, HMX and NG Solution: red line: 90 ml 0.05M PBS, ph ml ACN (MetOH for HMX); black line: +50 ppm TNT, PETN, RDX, 1,3-Dinitrobenzene, nitroglycerin and HMX Conditions: CV: E start : 1.1 V; E end : -1.4 V; Estep: 4 mv, Scan rate: 0.1 V/s. Displayed is the 10 th scan after stabilization
14 Sensing Platform Waveguide Laser Detector Rapid prototyped sensor platform. Includes inexpensive laser diode, waveguide and USB CCD imager. Eight channel waveguide interferometer chip on right.
15 Sensor Analytes Detected to Date Explosive Agents TNT (vapor) Ammonium Nitrate (vapor) TATP (vapor) Nitro Benzene RDX (vapor) Urea Nitrate Biological Agents Salmonella Avian influenza virus Anthrax spores Mycobacterium E. Coli Yersinia Pestis Campylobacter Listeria Narcotics Methamphetamine (vap) Methamphetamine HCl (solid) Chemical Compounds Hexane (liq, vap) Acetone (liq, vap) Chlorine (vap) Acetylene (in oil) HCl (vap) Freon (in serum) Ethylene (in oil) Chloramine (liq) Methylene Chloride (liq, vap) Methanol (vap) Hypochlorous acid (liq) NH 3 (liq, vap) Methane, ethane (in oil) Chloroform (liq, vap) Chemical Warfare Simulants N, N-dimethly acetamide (DMAC) Dimethly methyl phosphonate (DMMP) Methyl salicylate (all vapor) Proteins Avidin lgg, anti-lggf1 Antigen lge CSA Other Biologicals Biotin (co-factor) DNA Ricin A Chain hcg p24 (HIV) (all in solution) DNA Hybridization CD4 (all in solution) Groundwater Contaminants benzene (liq, vap) toluene (liq, vap) xylene (liq, vap) trichloroethylene (liq, vap) Perchloroethylene (liq, vap) cis & trans dichloroethylene (liq) vinyl chloride (liq) Electro-Optical Systems Laboratory EOSL - 15
16 Thank You Electro-Optical Systems Laboratory EOSL - 16
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