Determination and Generation of the Corrosion Compounds on Silver Exposed to the Atmospheres

Ag nanostructures are investigated as efficient plasmonic platforms because of their superior optical properties. However, the easy corrosion of Ag surfaces by reaction with oxygen or sulfur in the atmosphere can seriously affect the optical properties of Ag nanostructures, limiting the stable operation of Ag platforms. Herein, it is reported that a metal-organic framework (MOF) enables an Ag nanowire (NW) surface-enhanced Raman scattering (SERS) platform to be corrosion resistant. A single Ag NW on a film (Ag-NOF), an effective SERS-active platform, is coated with the zeolitic imidazolate framework-8, and then the corrosion resistance of the Ag-NOF structures is examined under a variety of harsh environmental conditions. Interestingly, the MOF-coated Ag-NOF platforms are found to provide excellent oxidation and sulfidation resistance. With the MOF coating, the SERS signals of the Ag-NOF structures are well maintained under harsh conditions, while the signals are reduced without MOF coating. More importantly, it is clearly verified that the MOF coating preserves the DNA sensing performance of the Ag-NOF platform even after storage under several environmental conditions. Based on the results, it is anticipated that these MOF-coated Ag-NOF structures will be used as long-term stable SERS sensors for the detection of biological and chemical molecules.

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Metal–Organic Framework Coating for the Preservation of Silver Nanowire Surface‐Enhanced Raman Scattering Platform

Kim

Jang

Moon

et al. 2019

Adv Materials Inter

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Corrosion of silver in environment containing halides, pseudohalides, or thiourea

Švadlena

Voráčová

Stoulil

2020

Materials & Corrosion

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Many studies of silver corrosion have been focused on indoor sulfur-containing atmospheres. However, significant corrosion damage of silver can also occur in the presence of other corrosion stimulants, such as halides, pseudohalides, or thiourea. These environments pose a specific threat for historical silver objects like daguerreotypes or coins, for example, during incorrect storing or cleaning method. To better characterize the silver corrosion caused by the solutions, electrochemical impedance spectroscopy (EIS) and electrical resistance technique were used. EIS measurements show that the dissolution of silver in tested solutions is mainly controlled by diffusion, suggesting the formation of a layer on the sample surface. For the electrical resistance technique, two different setups with electrical resistance probes were used: in saturated solutions and in atmospheric conditions simulating corrosion under deposits. In the latter setup, the corrosion rates decreased after a certain amount of time which can be explained by the presence of a salt layer (as suggested from EIS results). Regardless of the arrangement, cyanide and thiourea environment resulted in the highest corrosion rates.

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Preparation and properties of Ag plasmonic structures on garnet substrates

et al. 2021

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In this paper technological aspects of preparation of silver nanostructures on garnet substrates and their impact on absorption and photoluminescence have been studied. For this purpose, the changes of plasmonic properties as a function of the Ag NPs preparation features, such as type of substrate material, sputtered silver mass thickness, temperature, and time of thermal treatments were shown. The plasmonic structures were prepared on single-crystalline YAG and GGG garnets as well as amorphous glass substrates by the magnetron sputtering technique. Nucleation and growth of Ag nanoparticles were controlled by a thermal annealing process. Two broad absorption bands peaked at 350-370 nm and 440-650 nm were observed due to quadrupole and dipole modes, respectively, of surface plasmon resonance (SPR) of Ag nanoparticles. Changes of the positions, intensities, and widths of these absorption bands related to the nanoparticle sizes, densities, and shapes are presented. Degradation of the plasmonic structures at ambient conditions, which is revealed as diminishing of the plasmonic absorption bands and associated with sulphidation of Ag nanoparticles in the natural environment, was studied in details. Theoretical simulations of the sulphidation process modelled as coating of Ag nanoparticles with silver sulphide (Ag 2 S) film confirm the experimentally observed diminishing of SPR.

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Determination and Generation of the Corrosion Compounds on Silver Exposed to the Atmospheres

Cited by 23 publications

References 30 publications

Metal–Organic Framework Coating for the Preservation of Silver Nanowire Surface‐Enhanced Raman Scattering Platform

Metal–Organic Framework Coating for the Preservation of Silver Nanowire Surface‐Enhanced Raman Scattering Platform

Corrosion of silver in environment containing halides, pseudohalides, or thiourea

Preparation and properties of Ag plasmonic structures on garnet substrates

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