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Low-Power, Chip-Scale, CO2 Gas Sensors for Spacesuit MonitoringN5 Sensors, Inc. and NASA through a STTR program are jointly developing ultra-small, low-power carbon dioxide (CO2) gas sensors, suited for monitoring CO2 levels inside the spacesuits. Due to the unique environmental conditions within the spacesuits, such as high humidity, large temperature and operating pressure swings, measurement of key gases relevant to astronaut's safety and health such as carbon dioxide, is quite challenging. Conventional non-dispersive infrared absorption based CO2 sensors cannot be effectively implemented inside the spacesuits due to their sizes, weights, and power constraints. Metal-oxide based sensors have been effectively miniaturized for several applications, however detection of CO2 utilizing metal-oxide based sensors is challenging due to the chemical inertness and high stability of CO2 at room-temperatures. To mitigate these limitations, unique chip-scale, nanoengineered chemiresistive gas-sensing architecture has been developed - to allow the Metal-oxide sensors to operate in space-suite environmental conditions. Unique design combining the selective adsorption properties of the nanophotocatalytic clusters of metal-oxides and metals, provides selective detection of CO2 in high relative humidity conditions. All electronic design provides a compact and low-power solution, which can be implemented for multipoint detection of CO2 inside the spacesuits. This paper will describe a novel approach in refining the sensor architecture, development of new photocatalytic material for better sensor performance.
Document ID
20190028303
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Thomson, Brian (N5 Sensors, Inc. Rockville, MD, United States)
Shi, Chen (N5 Sensors, Inc. Rockville, MD, United States)
Rani, Asha (N5 Sensors, Inc. Rockville, MD, United States)
Debnath, Rantan (N5 Sensors, Inc. Rockville, MD, United States)
Motayed, Abhishek (N5 Sensors, Inc. Rockville, MD, United States)
Chullen, Cinda (NASA Johnson Space Center Houston, TX, United States)
Date Acquired
July 29, 2019
Publication Date
July 7, 2018
Subject Category
Man/System Technology And Life Support
Report/Patent Number
JSC-E-DAA-TN54321
Meeting Information
Meeting: International Conference on Environmental Systems
Location: Albuquerque, NM
Country: United States
Start Date: July 8, 2018
End Date: July 12, 2018
Sponsors: International Conference On Environmental Systems, Inc.
Funding Number(s)
CONTRACT_GRANT: NX17CJ01C
CONTRACT_GRANT: NNX17CJ01C
Distribution Limits
Public
Copyright
Public Use Permitted.

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