Micro-Raman investigation of Ag/graphene oxide/Au sandwich structure

Politano, Grazia Giuseppina; Cazzanelli, E.; Versace, C.; Castriota, Marco; Desiderio, Giovanni; Davoli, Mariano; Vena, Carlo; Bartolino, Roberto

doi:10.1088/2053-1591/ab11f8

Cited by 16 publications

(15 citation statements)

References 27 publications

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“…We practically prepared and demonstrated MDC layer-based optical coating building blocks with high structural and optical durability and stability [24,25], however, until recently, we have not explored the color chromaticity properties of those multilayer coating types. Even though this work is a continuation of efforts reported in a broader metal-dielectric materials research area [26][27][28], and alternative material system solutions might exist in industrial settings, we are unaware, to the best of our knowledge, of any prior reports on achieving environmentally stable THR coatings based on using the same material combination while targeting the accurate control over the chromaticity.Metal-dielectric thin-film coatings (spectral filters featuring controlled apparent colors) have numerous application possibilities in the fields of building architecture, windows, printed products, and other decorative coatings. There are several reports that have been published in the literature about the color properties of different types of thin-film materials (most of these are single-layer), except a couple of them were found to deal with the color properties of multilayer thin-film structures [29][30][31][32][33][34][35][36][37][38][39].…”

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Optical and Chromaticity Properties of Metal-Dielectric Composite-Based Multilayer Thin-Film Structures Prepared by RF Magnetron Sputtering

et al. 2020

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Coated glass products, and especially the low-emissivity coatings, have become a common building material used in modern architectural projects. More recently, these material systems became common in specialized glazing systems featuring solar energy harvesting. Apart from achieving the stability of optical parameters in multilayer coatings, it is also important to have improved control over the design of visual color properties of the coated glass. We prepare metal-dielectric composite (MDC)-based multilayer thin-film structures using the radio frequency (RF)-magnetron sputtering deposition and report on their optical and chromaticity properties in comparison with these obtained using pure metal-based Dielectric/Metal/Dielectric (DMD) trilayer structures of similar compositions. Experimentally achieved Hunter L, a, b values of MDC-based multilayer building blocks of coatings provide a new outlook on the engineering of future-generation optical coatings with better color consistency and developing approaches to broaden the range of achievable color coordinates and better environmental stability.Low-E coatings can still be expected to represent core technology in advanced windows, whether or not additional technologies are embedded. The Low-E coatings are typically structured as metal-dielectric multilayer thin films, which are designed to prevent heat leakage (from the inside of buildings into the environment) by providing strong and very wide-band reflection of thermal infrared wavelengths.In recent years, the optical properties of metal-dielectric coatings and their influence on building energy efficiency have been studied extensively due to their superior performance compared to other multilayer coating structure types. The metal-dielectric coatings performance mainly depends on the choice of materials and its design philosophy [7][8][9][10][11][12][13][14][15]. Most (or practically all) products available today from this category (featuring high spectral selectivity) employ at least two silver (Ag) layers within their structure, and these coatings cannot withstand prolonged (weeks-scale) exposure to either the ambient atmospheric air or dry-heat test temperatures in excess of 160-180 • C. However, the stability problems of ultrathin Ag layers (normally of less than 20 nm thickness) originate from a range of factors related to the metal layer growth morphology. To overcome these issues, a significant number of research works have been proposed, conducted, and resulted in reporting various solutions, where some of them require more complex materials processing and process parameters optimization [10][11][12][13][14][15][16][17][18][19]. Several reports have been published about the properties of various metal-dielectric composite (MDC) thin-film layer chemistries, including Ag + SiO 2 , Ag + TiO 2 , and Ag + MgF 2 ; however, most of them were about metal-dielectric nanoparticle array properties of interest for various applications [20][21][22][23]. We previously proposed and partially implemented the developmen...

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Optical and Chromaticity Properties of Metal-Dielectric Composite-Based Multilayer Thin-Film Structures Prepared by RF Magnetron Sputtering

et al. 2020

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“…Magnetron sputtering has been used as a main fabrication technique after decades of development, thanks to the higher energy of the deposited atoms than in evaporation, the good controllability of the process, and the relatively low cost of the instrument [ 2 ]. It is also widely used for making other multilayer films [ 3 , 4 ]. To further improve the interface quality, different interface engineering methods based on physical sputtering were developed.…”

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Comparative Study of Pd/B4C X-ray Multilayer Mirrors Fabricated by Magnetron Sputtering with Kr and Ar Gas

Huang

Liu

et al. 2020

Materials

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Ultrathin Pd/B4C multilayers are suitable X-ray mirrors working at the photon energy region of 7–20 keV. To further improve the layer structure, Pd/B4C multilayers with a d-spacing of 2.5 nm were fabricated by magnetron sputtering using the heavy noble gas Kr and compared with the conventional ones fabricated by Ar. Although the Kr-sputtering process can work at a lower pressure, the interface width—especially the interface roughness—is a little larger than that made by Ar. A stronger polycrystallization and a lower content of sputter gas atoms were found in the Kr-made sample, which can be explained by the joint effect from less recoiled particles and lower sputtering pressure. A good reflectance of 68% of the Kr made multilayer was measured at 10 keV, which is only slightly lower than that of the Ar made sample (71%).

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“…Additionally, for target molecules to directly or proximately contact the surface or hot spots regions with accurate plasmon resonance fields, it is also a key issue to improve the sensitivity of SERS detection. As a solution, construction of composite SERS substrates by modification of gold or silver NPs in flexible support materials [10][11][12][13][14][15] is regarded.…”

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confidence: 99%

Preparation of Hydrophobic Film by Electrospinning for Rapid SERS Detection of Trace Triazophos

Shao

Cao

et al. 2020

Sensors

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For real application, it is an urgent demand to fabricate stable and flexible surface-enhanced Raman scattering (SERS) substrates with high enhancement factors in a large-scale and facile way. Herein, by using the electrospinning technique, a hydrophobic and flexible poly(styrene-co-butadiene) (SB) fibrous membrane is obtained, which is beneficial for modification of silver nanoparticles (Ag NPs) colloid in a small region and then formation of more “hot spots” by drying; the final SERS substrate is designated as Ag/SB. Hydrophobic Ag/SB can efficiently capture heterocyclic molecules into the vicinity of hot spots of Ag NPs. Such Ag/SB films are used to quantitatively detect trace triazophos residue on fruit peels or in the juice, and the limit of detection (LOD) of 2.5 × 10−8 M is achieved. Ag/SB films possess a capability to resist heat. As a case, 6-mercaptopurine (6MP) that just barely dissolves in 90 °C water is picked for conducting Ag/SB-film-based experiments.

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Micro-Raman investigation of Ag/graphene oxide/Au sandwich structure

Cited by 16 publications

References 27 publications

Optical and Chromaticity Properties of Metal-Dielectric Composite-Based Multilayer Thin-Film Structures Prepared by RF Magnetron Sputtering

Optical and Chromaticity Properties of Metal-Dielectric Composite-Based Multilayer Thin-Film Structures Prepared by RF Magnetron Sputtering

Comparative Study of Pd/B4C X-ray Multilayer Mirrors Fabricated by Magnetron Sputtering with Kr and Ar Gas

Preparation of Hydrophobic Film by Electrospinning for Rapid SERS Detection of Trace Triazophos

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