Datensätze / Nanostructures for Advanced Imaging and Detector Devices Project


Nanostructures for Advanced Imaging and Detector Devices Project

Published By National Aeronautics and Space Administration

Issued mehr als 9 Jahre ago

US
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Summary

Art der Freigabe
a one-off release of a single dataset

Datenlizenz
Not Applicable

Inhaltslizenz
Creative Commons CCZero

Bestätigung
automatisiert zertifiziert

Description

<p>We have developed carbon nanotube formulations primarily geared towards enhanced stray light control on a variety of instruments.  IRAD has supported development of this technology to make it 10 to 100 times blacker than alternate surface treatments from the Near UV to Far Infrared and a large variety of substrates suitable for space flight instrumentation.   In addition, we have performed the first growth on catalyst applied to substrates using Atomic Layer Deposition (ALD).  Catalyst is normally deposited using thermal or e-beam evaporation which allows for coating flat surfaces.  Many baffles are dimensional, curved or complex, requiring conformal deposition.  The development of a conformal nanotube process is enabling to many applications.  We have demonstrated ALD of iron catalyst out of house and hope to achieve an in-house capability.  Ellipsometry performed on the part verified sub nanometer uniformity of catalyst across a test part .  The compact coronagraph baffle is larger and more complex which will pose a significant challenge in maintaining uniformity over a larger third dimension.   In addition, we must solve the problem of managing feedstock gas flow in our nanotube furnace during chemical vapor deposition (CVD).  We have seen significant shadowing and non uniformity of growth due to laminar flow at substrate edges.  Modeling of the gas flow has begun and will be useful in solving this problem.  In addition we are performing our occulter growth using a reflector to direct feedstock gas to the shadowed side of the mask.  Our goal will be to address these challenges and deliver a solar chronographic mask that is applicable to other scientific observations.</p>