RF transparent vanadium oxide based single and bi-layer thin films as passive thermal control element for satellite antenna application

Prajwal, Kumar; Akinlabi, Esther T.; Dey, Arjun

doi:10.1016/j.ceramint.2018.05.204

Cited by 9 publications

(6 citation statements)

References 4 publications

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“…Silicones are useful coatings that have the ability to form a SiO x glass-like film which can protect itself from atomic oxygen attack (Silverman, 1995). Germanium coated black Kapton is used as a thermal control on the sunshield of satellite antennae as it is transparent in radio frequencies, whilst also protecting the underlying Kapton from atomic oxygen (Prajwal et al, 2018). Although widely utilised, germanium coatings are particularly vulnerable to oxygen degradation during storage on the ground, with a typical shelf life of only ~6 months (Esther et al, 2015).…”

Section: Atomic Oxygenmentioning

confidence: 99%

Palladium-coated kapton for use on dust detectors in low earth orbit: Performance under hypervelocity impact and atomic oxygen exposure

Dignam

Wozniakiewicz²,

Burchell³

et al. 2022

Front. Space Technol.

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Observation of dust and debris in the near Earth environment is a field of great commercial and scientific interest, vital to maximising the operational and commercial life-cycle of satellites and reducing risk to increasing numbers of astronauts in Low Earth Orbit (LEO). To this end, monitoring and assessment of the flux of particles is of paramount importance to the space industry and wider socio-economic interests that depend upon data products/services from orbital infrastructure. We have designed a passive space dust detector to investigate the dust environment in LEO—the Orbital Dust Impact Experiment (ODIE). ODIE is designed for deployment in LEO for ∼1 year, whereupon it would be returned to Earth for analysis of impact features generated by dust particles. The design emphasises the ability to distinguish between the orbital debris (OD) relating to human space activity and the naturally occurring micrometeoroid (MM) population at millimetre to submillimetre scales. ODIE is comprised of multiple Kapton foils, which have shown great potential to effectively preserve details of the impacting particles’ size and chemistry, with residue chemistry being used to interpret an origin (OD vs. MM). LEO is a harsh environment—the highly erosive effects of atomic oxygen damage Kapton foil—requiring the use of a protective coating. Common coatings available for Kapton (e.g., Al, SiO2, etc.) are problematic for subsequent analysis and interpretation of OD vs. MM origin, being a common elemental component of MM or OD, or having X-ray emission peaks overlapping with those of elements used to distinguish MM from OD. We thus propose palladium coatings as an alternative for this application. Here we report on the performance of palladium as a protective coating for a Kapton-based passive dust detector when exposed to atomic oxygen and impact. When subjected to impact, we observe that thicker coatings suffer delamination such that a coating of <50 nm is recommended. Analysis of atomic oxygen exposed samples shows a thin 10 nm coating of palladium significantly reduces the mass loss of Kapton, while coatings of 25 nm and over perform as well as or better than other commonly used coatings.

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Section: Atomic Oxygenmentioning

confidence: 99%

Palladium-coated kapton for use on dust detectors in low earth orbit: Performance under hypervelocity impact and atomic oxygen exposure

Dignam

Wozniakiewicz²,

Burchell³

et al. 2022

Front. Space Technol.

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“…Vanadium oxides are popular as functional material for satellites to battery applications. [32,33] These oxides possess complex oxidation states [17,34] and are highly beam sensitive. [35] The sample preparation of crystalline vanadium oxides for in-situ temperature based TEM characterization were carried out by several methods viz.…”

Section: In-situ Tem Analysis Of the Amorphous To Crystalline Transitmentioning

confidence: 99%

Double shadow masking sample preparation method for in‐situ TEM characterization

et al. 2020

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A novel double mechanical masking-based sample preparation method is introduced for in-situ transmission electron microscopy (TEM) characterizations. In the current study amorphous vanadium pentoxide thin film deposition is carried out by using the developed double mask on a transparent window of TEM chip on precisely selected spots by a reactive sputtering technique. The prepared sample is less damaged since it is not subjected to ion beam exposure. And the probability of achieving a viable TEM sample is also enhanced compared to classical preparation methods. In-situ temperature-based electron diffraction pattern sequences are recorded for amorphous vanadium pentoxide in the temperature region of 25 to 500˚C. This allowed observing the crystallization temperature at ∼416˚C. The pre-and post-heat-treated microstructure and electron diffraction pattern of the vanadium pentoxide thin film showed the formation of a mixed crystalline and amorphous film. Thus, a most reliable, reusable and cost effective TEM sample preparation method was demonstrated. K E Y W O R D S amorphous crystalline behavior, double masking techniques, electron diffractions, in-situ transmission electron microscopy, vanadium pentoxide (V 2 O 5) This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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“…Recently, for the first time, an interfacial reaction-induced SMT was reported in amorphous vanadium pentoxide deposited on soda-lime glass. [27] V 2 O 5 is the basic building block for many functional applications [28][29][30][31] therefore, in-depth analyses to trace the origin of the SMT as a function of temperature are essential. However, the existing literature reports the occurrence of SMT at different temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…V 2 O 5 is the basic building block for many functional applications [ 28–31 ] therefore, in‐depth analyses to trace the origin of the SMT as a function of temperature are essential. However, the existing literature reports the occurrence of SMT at different temperatures.…”

Section: Introductionmentioning

confidence: 99%

Demystifying the Semiconductor‐to‐Metal Transition in Amorphous Vanadium Pentoxide: The Role of Substrate/Thin Film Interfaces

Esther,

Muralikrishna,

Chirumamilla

et al. 2024

Adv Funct Materials

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The precise mechanism governing the reversible semiconductor‐to‐metal transition (SMT) in V2O5 remains elusive, yet its investigation is of paramount importance due to the remarkable potential of V2O5 as a versatile “smart” material in advancing optoelectronics, plasmonics, and photonics. In this study, distinctive experimental insights into the SMT occurring in amorphous V2O5 through the application of highly sensitive, temperature‐dependent, in situ analyses on a V2O5 thin film deposited on soda‐lime glass are presented. The ellipsometry measurements reveal that the complete SMT occurs at ≈340 °C. Remarkably, the refractive index and extinction coefficients exhibit reversible characteristics across visible and near‐infrared wavelengths, underscoring the switch‐like behavior inherent to V2O5. The findings obtained from ellipsometry are substantiated by calorimetry and in situ secondary ion mass spectrometry analyses. In situ electron microscopy observations unveil a separation of oxidation states within V2O5 at 320 °C, despite the thin film retaining its amorphous state. The comprehensive experimental investigations effectively demonstrate that alterations in electronic state can trigger the SMT in amorphous V2O5. It is revealed for the first time that the SMT in V2O5 is solely contingent upon electronic state changes, independent of structural transitions, and importantly, it is a reversible transformation within the amorphous state itself.

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RF transparent vanadium oxide based single and bi-layer thin films as passive thermal control element for satellite antenna application

Cited by 9 publications

References 4 publications

Palladium-coated kapton for use on dust detectors in low earth orbit: Performance under hypervelocity impact and atomic oxygen exposure

Palladium-coated kapton for use on dust detectors in low earth orbit: Performance under hypervelocity impact and atomic oxygen exposure

Double shadow masking sample preparation method for in‐situ TEM characterization

Demystifying the Semiconductor‐to‐Metal Transition in Amorphous Vanadium Pentoxide: The Role of Substrate/Thin Film Interfaces

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