Room temperature self-assembled Ag nanoparticles/Mo-37.5% Ag film as efficient flexible SERS substrate
TL;DR: In this article, the phase, surface morphology, composition and thickness of the Mo-Ag films were characterized by XRD, FESEM, EDS and TEM, respectively.
About: This article is published in Materials Letters.The article was published on 2020-09-15. It has received 18 citations till now. The article focuses on the topics: Sputter deposition & Substrate (electronics).
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TL;DR: In this article, the effects of Ag contents on the microstructure of self-grown Ag nanoparticles/Mo-Ag alloy films were investigated using XRD, FESEM, EDS and TEM.
Abstract: Abstract Ag nanoparticles/Mo–Ag alloy films with different Ag contents were prepared on polyimide by magnetron sputtering. The effects of Ag contents on the microstructure of self-grown Ag nanoparticles/Mo–Ag alloy films were investigated using XRD, FESEM, EDS and TEM. The Ag content plays an important role in the size and number of uniformly distributed Ag nanoparticles spontaneously formed on the Mo–Ag alloy film surface, and the morphology of the self-grown Ag nanoparticles has changed significantly. Additionally, it is worth noting that the Ag nanoparticles/Mo–Ag alloy films covered by a thin Ag film exhibits highly sensitive surface-enhanced Raman scattering (SERS) performance. The electric field distributions were calculated using finite-difference time-domain analysis to further prove that the SERS enhancement of the films is mainly determined by “hot spots” in the interparticle gap between Ag nanoparticles. The detection limit of the Ag film/Ag nanoparticles/Mo–Ag alloy film for Rhodamine 6G probe molecules was 5 × 10−14 mol/L. Therefore, the novel type of the Ag film/Ag nanoparticles/Mo–Ag alloy film can be used as an ideal SERS-active substrate for low-cost and large-scale production.
15 citations
Cites background from "Room temperature self-assembled Ag ..."
...The cross-sectional morphology of the Mo–Ag alloy films is shown in Figure 2(c2–f2), and the relative position relationship between the self-formed particles and the film is obviously different from the particles embedded in the traditional film [26]....
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...A uniform, stable, highly ordered and controllable nanoparticle film can be prepared by self-assembly method [26], which can improve the reproducibility and sensitivity of SERS detection....
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TL;DR: The Ag layer/annealed Mo-48.2% Ag films can identify crystal violet (CV) with concentration lower than 5 × 10−10 M (1 mol/L = 1 M), which indicated that this novel type of particles/films can be applied as ultrasensitive SERS substrates.
Abstract: Mo-48.2% Ag films were fabricated by direct current (DC) magnetron sputtering and annealed in an argon atmosphere. The effects of annealing on the surface morphology, resistivity and surface-enhanced Raman scattering (SERS) performance of Mo-48.2% Ag films were investigated. Results show a mass of polyhedral Ag particles grown on the annealed Mo-48.2% Ag films’ surface, which are different from that of as-deposited Mo-Ag film. Moreover, the thickness and the resistivity of Mo-48.2% Ag films gradually decrease as the annealing temperature increases. Furthermore, finite-difference time-domain (FDTD) simulations proved that the re-deposition Ag layer increases the “hot spots” between adjacent Ag nanoparticles, thereby greatly enhancing the local electromagnetic (EM) field. The Ag layer/annealed Mo-48.2% Ag films can identify crystal violet (CV) with concentration lower than 5 × 10−10 M (1 mol/L = 1 M), which indicated that this novel type of particles/films can be applied as ultrasensitive SERS substrates.
7 citations
Cites background or methods or result from "Room temperature self-assembled Ag ..."
...Flexible polyimide (PI) substrates were cleaned with acetone, deionized water and ethanol for 15 min [28]....
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...2% Ag film are Ag particles, which is consistent with the previous studies of as-deposited Mo-Ag film [28]....
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...Conversely, the intensity of the Mo (110) diffraction peaks in the Mo-Ag films decreases as the annealing temperature increases, which demonstrated that the Ag grains have an inhibitory effect on the growth of Mo grains [28]....
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...Based on the previous transmission electron microscopy (TEM) and EDS analysis of the self-grown particles on the Mo-Ag films’ surface, it can be determined that these particles are Ag particles [28,30]....
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TL;DR: Inspired by hand writing approach for preparing surfaceenhanced Raman scattering (SERS) substrates, silver nanoparticles (AgNPs) decorated drawing paper substrates were prepared by robotic writing technique as discussed by the authors.
4 citations
TL;DR: In this article, self-formed Ag nanoparticles/Ag-Co alloy films with various Co contents were fabricated by sputtering Ag-Co composite target and investigated through SEM, TEM and Raman spectrometer.
4 citations
TL;DR: In this paper , a large amount of polyhedral single-crystal Ag nanoparticles grow on the surface of Ag-Co alloy films, which is significantly different from the microstructure of Ag Co alloy films on rigid substrates.
3 citations
References
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TL;DR: A review of the most common metallic SERS substrates for chemical detection only is discussed, as well as SERS paradigms that are commercially available that have been addressed.
Abstract: The SERS effect was initially discovered in the 1970s. Early research focused on understanding the phenomenon and increasing enhancement to achieve single molecule detection. From the mid-1980s to early 1990s, research started to move away from obtaining a fundamental understanding of the phenomenon to the exploration of analytical applications. At the same time, significant developments occurred in the field of photonics that led to the advent of inexpensive, robust, compact, field-deployable Raman systems. The 1990s also saw rapid development in nanoscience. This convergence of technologies (photonics and nanoscience) has led to accelerated development of SERS substrates to detect a wide range of chemical and biological analytes. It would be a monumental task to discuss all the different kinds of SERS substrates that have been explored. Likewise, it would be impossible to discuss the use of SERS for both chemical and biological detection. Instead, a review of the most common metallic (Ag, Cu, and Au) SERS substrates for chemical detection only is discussed, as well as SERS substrates that are commercially available. Other issues with SERS for chemical detection have been selectivity, reversibility, and reusability of the substrates. How these issues have been addressed is also discussed in this review.
411 citations
TL;DR: This review analyzed the physiological cellular pathway perturbations in terms of oxidative stress induction, mitochondrial membrane potential alteration, cell death, apoptosis, DNA damage and cytokines secretion after Ag NPs exposure following their toxicity mechanism in cells.
Abstract: The large use of nanomaterials in many fields of application and commercial products highlights their potential toxicity on living organisms and the environment, despite their physico-chemical properties. Among these, silver nanoparticles (Ag NPs) are involved in biomedical applications such as antibacterial agents, drug delivery vectors and theranostics agents. In this review, we explain the common synthesis routes of Ag NPs using physical, chemical, and biological methods, following their toxicity mechanism in cells. In particular, we analyzed the physiological cellular pathway perturbations in terms of oxidative stress induction, mitochondrial membrane potential alteration, cell death, apoptosis, DNA damage and cytokines secretion after Ag NPs exposure. In addition, their potential anti-cancer activity and theranostic applications are discussed.
143 citations
TL;DR: In this review, the fabrication methods for synthesizing silver nanoparticles of different shapes and specific size are illustrated in detail and the corresponding properties and applications ofsilver nanoparticles are discussed.
Abstract: As the advanced functional materials, silver nanoparticles are potentially useful in various fields such as photoelectric, bio-sensing, catalysis, antibacterial and other fields, which are mainly based on their various properties. However, the properties of silver nanoparticles are usually determined by their size, shape, and surrounding medium, which can be modulated by various synthesis methods. In this review, the fabrication methods for synthesizing silver nanoparticles of different shapes and specific size are illustrated in detail. Besides, the corresponding properties and applications of silver nanoparticles are also discussed in this paper.
100 citations
TL;DR: In this paper, periodic Ag nanocluster arrays for surface enhanced Raman spectroscopy (SERS) were fabricated through magnetron sputtering Ag over a large-area monolayer template which is based on silica (SiO2) nanospheres.
46 citations
TL;DR: In this article, a comprehensive relationship between film thickness, microstructure, stresses and resistivity is established, showing that with increasing film thickness and growth of (110) orientated domains, resistivity reaches constant levels for films thicker than 0.7μm.
38 citations