Tenders Are Invited For Assessment Of Graphene Based Devices As Multi-Gas Sensors For Human Spaceflight - Expro Plus

Tenders are invited for Assessment of Graphene Based Devices as Multi-Gas Sensors for Human Spaceflight - Expro plus To assess the potential of functionalized graphene devices as electronic nose for human spaceflight applications to detect hazardous substances in space habitat atmospheres. Description:Graphene is an emerging novel semiconductor material that can be used for a wide range of applications. By treating the surface with different reagents, it can be made reactive to certain molecule types (functionalization). When a specific molecule docks to the surface, changes in electrical resistance can be measured (Chemristor). Graphene-based gas sensors have the potential to be miniaturized, made light-weight and operate with low energy consumption compared to existing solutions such as mass-spectrometers. They could therefore be easily distributed over various habitat/ station modules or used within a spacesuit to act as early warning/ indicator systems. A previous PECS study (ESA contract no. 4000126337). used graphene/silver to collect trace gases and an IR spectrometer to detect them. In contrast, this activity intends to use graphene directly for both, collection and detection, thereby dropping fully the need for a spectrometer. This enables extreme miniaturization compared to state of the art solutions. This activity aims at assessing the potential of functionalized graphene devices for human spaceflight applications to detect hazardous gases, such as e.g. H2, O3, CO, CO2, NO, NH3, Hydrazine and others. This activity encompasses the following tasks:- Identification of potentially occurring hazardous target substances expected in habitat modules- Perform a trade-off on the available sensing capabilities with respect to the identified hazardous gases.- Selection of different surface functionalisation routes for Graphene (-oxide) enabling peakresponse at the respective targeted substances.- Manufacturing of individual Graphene chemristor elements corresponding to above functionalization for the most targeted substances.- Combination of the individual chemristor elements to create a sensor array (demonstrator),supported by an intelligent readout (e.g. machine learning based) scheme to reach an electronic nose for the target substances. This shall be done by using not only peak responses from the chemristor sub-elements but instead taking substance fingerprint signatures from the full array, to determine both, substance types and concentration levels at the same time.- Electrical characterization wrt selectivity, sensitivity, reaction time, refresh time, temperatureand operational stability, power consumption.Procurement Policy: C(3) = Activity restricted to SMEs RD Entities. For additional information please go to:http://www.esa.int/About_Us/Business_with_ESA/Small_and_Medium_Sized_Enterprises/Opportunities_for_SMEs/Procurement_policy_on_fair_access_for_SMEs_-_the_C1-C4_Clauses Tender Link : https://esastar-publication-ext.sso.esa.int/ESATenderActions/filter/open

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