Advanced protection against environmental degradation of silver mirror stacks for space application

Kurapati, Rajendra; Maurice, Vincent; Seyeux, Antoine; Klein, Lorena H.; Mercier, Dimitri; Chauveau, Grégory; Grèzes-Besset, Catherine; Berthod, Loïc; Marcus, Philippe

doi:10.1016/j.jmst.2020.01.019

Cited by 3 publications

(2 citation statements)

References 31 publications

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“…A silver layer on a glass surface is susceptible to oxidation [ 55 ] as well as to degradation by moisture [ 56 ]. Coatings of different materials were previously tested in order to increase the stability of a formed silver layer [ 57 , 58 , 59 , 60 , 61 , 62 ]. The influence of blocking agent treatment on the stability of the silver layer was also examined.…”

Section: Resultsmentioning

confidence: 99%

The Incorporation of Amplified Metal-Enhanced Fluorescence in a CMOS-Based Biosensor Increased the Detection Sensitivity of a DNA Marker of the Pathogenic Fungus Colletotrichum gloeosporioides

2020

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Half of the global agricultural fresh produce is lost, mainly because of rots that are caused by various pathogenic fungi. In this study, a complementary metal-oxide-semiconductor (CMOS)-based biosensor was developed, which integrates specific DNA strands that allow the detection of enoyl-CoA-hydratase/isomerase, which is a quiescent marker of Colletotrichum gloeosporioides fungi. The developed biosensor mechanism is based on the metal-enhanced fluorescence (MEF) phenomenon, which is amplified by depositing silver onto a glass surface. A surface DNA strand is then immobilized on the surface, and in the presence of the target mRNA within the sample, the reporter DNA strand that is linked to horseradish peroxidase (HRP) enzyme will also bind to it. The light signal that is later produced from the HRP enzyme and its substrate is enhanced and detected by the coupled CMOS sensor. Several parameters that affect the silver-deposition procedure were examined, including silver solution temperature and volume, heating mode, and the tank material. Moreover, the effect of blocking treatment (skim milk or bovine serum albumin (BSA)) on the silver-layer stability and nonspecific DNA absorption was tested. Most importantly, the effect of the deposition reaction duration on the silver-layer formation and the MEF amplification was also investigated. In the study findings a preferred silver-deposition reaction duration was identified as 5–8 min, which increased the deposition of silver on the glass surface up to 13-times, and also resulted in the amplification of the MEF phenomenon with a maximum light signal of 50 relative light units (RLU). It was found that MEF can be amplified by a customized silver-deposition procedure that results in increased detection sensitivity. The implementation of the improved conditions increased the biosensor sensitivity to 3.3 nM (4500 RLU) with a higher detected light signal as compared to the initial protocol (400 RLU). Moreover, the light signal was amplified 18.75-, 11.11-, 5.5-, 11.25-, and 3.75-times in the improved protocol for all the tested concentrations of the target DNA strand of 1000, 100, 10, 3.3, and 2 nM, respectively. The developed biosensor system may allow the detection of the pathogenic fungus in postharvest produce and determine its pathogenicity state.

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Section: Resultsmentioning

confidence: 99%

The Incorporation of Amplified Metal-Enhanced Fluorescence in a CMOS-Based Biosensor Increased the Detection Sensitivity of a DNA Marker of the Pathogenic Fungus Colletotrichum gloeosporioides

2020

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“…The total thickness of the protective layer remains unchanged, the unit layer in the two-layer structure is further designed as the nanolaminate structure [9,10], which can improve the corrosion resistance of the protection layer. Many physical vapor deposition technologies is used to fabricate the films [11,12], where electron beam evaporation deposition is widely used for large aperture mirrors [8,13] at room temperature. The packing density of the film can be improved through ion source assistance.…”

Section: Introductionmentioning

confidence: 99%

Study on environmental durability of nanolaminate silver-based films under edge protection

Wei

et al. 2023

International Conference on Optoelectronic Materials and Devices (ICOMD 2022)

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In the field of large aperture mirrors, the silver-based films have the highest reflectivity from visible to near-infrared. However, the environmental stability of silver thin film is poor. To study the corrosion resistance of protection layers over silver layer, nanolaminate structure protection layers and conventional two-layers type protection layers were designed and fabricated on silver layer by ion beam assisted electron beam evaporation (IAD). The reflectivity difference between nanolaminate protected silver-based films and conventional two-layers protected silver-based films was small in long wavelength region. After 48 hours of humidity test, the reflectivity reduction of conventional two-layers type protection silver-based films was more serious than that of the nanolaminate protected silver-based film, furthermore, the number of defects on the surface of conventional two-layers type protection layers was more than that of the nanolaminate structure protection layers. This indicated that, the nanolaminate structure protection layers performed better than conventional two-layers type protection layers in aspect of environmental durability. Given the edge corrosion problem of the mirror produced by IAD, new edge protection method was designed and the silver-based film was prepared. After 48 hours of humidity test, the edge of the mirror was investigated by Zeta 500, it is concluded that this kind of mirror exhibited highly anti-corrosion with better environmental stability.

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Implementation of Ag/ SiO2 nanofilms for metamaterial engineering

et al. 2022

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Advanced protection against environmental degradation of silver mirror stacks for space application

Cited by 3 publications

References 31 publications

The Incorporation of Amplified Metal-Enhanced Fluorescence in a CMOS-Based Biosensor Increased the Detection Sensitivity of a DNA Marker of the Pathogenic Fungus Colletotrichum gloeosporioides

The Incorporation of Amplified Metal-Enhanced Fluorescence in a CMOS-Based Biosensor Increased the Detection Sensitivity of a DNA Marker of the Pathogenic Fungus Colletotrichum gloeosporioides

Study on environmental durability of nanolaminate silver-based films under edge protection

Implementation of Ag/ SiO2 nanofilms for metamaterial engineering

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