scholarly journals Discrepancies in the Microstructures of Annealed Cu–Zr Bulk Alloy and Cu–Zr Alloy Films

Materials ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2467 ◽  
Author(s):  
Haoliang Sun ◽  
Xiaoxue Huang ◽  
Xinxin Lian ◽  
Guangxin Wang
Keyword(s):  
Bulk Alloy ◽  
Alloy Films ◽  
Film Composite ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Potential Applications ◽  
Enhanced Raman Scattering ◽  
Stress States ◽  
Bulk Alloys ◽  
Zr Alloy

Copper–zirconium bulk alloy and Cu–Zr alloy films are prepared by vacuum smelting and magnetron sputtering, respectively, and subsequently annealing is conducted. Results show that Cu–Zr bulk alloy and alloy films exhibit significantly different microstructure evolution behaviors after annealing due to different microstructures and residual stress states. CuxZr alloy compounds disperse at the grain boundary of Cu grains in as-cast and annealed Cu–Zr bulk alloys. However, unlike bulk alloys, a large number of polyhedral Cu particles are formed on the Cu–Zr thin films’ surface upon thermal annealing. Kinetically, the residual compressive stress in the Cu–Zr films promotes the formation of Cu particles. The influencing factors and the path for mass transport in the formation of the particles are discussed. The large-specific surface area particles/film composite structure has potential applications in Surface-Enhanced Raman Scattering, catalysis, and other fields.

scholarly journals Manipulation and Applications of Hotspots in Nanostructured Surfaces and Thin Films

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1667 ◽  
Author(s):  
Xiaoyu Zhao ◽  
Jiahong Wen ◽  
Aonan Zhu ◽  
Mingyu Cheng ◽  
Qi Zhu ◽  
...  
Keyword(s):  
Thin Films ◽  
Physical Vapor Deposition ◽  
Molecular Spectroscopy ◽  
Deposition Process ◽  
Etching Time ◽  
Nanostructured Surfaces ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Potential Applications ◽  
Enhanced Raman Scattering

The synthesis of nanostructured surfaces and thin films has potential applications in the field of plasmonics, including plasmon sensors, plasmon-enhanced molecular spectroscopy (PEMS), plasmon-mediated chemical reactions (PMCRs), and so on. In this article, we review various nanostructured surfaces and thin films obtained by the combination of nanosphere lithography (NSL) and physical vapor deposition. Plasmonic nanostructured surfaces and thin films can be fabricated by controlling the deposition process, etching time, transfer, fabrication routes, and their combination steps, which manipulate the formation, distribution, and evolution of hotspots. Based on these hotspots, PEMS and PMCRs can be achieved. This is especially significant for the early diagnosis of hepatocellular carcinoma (HCC) based on surface-enhanced Raman scattering (SERS) and controlling the growth locations of Ag nanoparticles (AgNPs) in nanostructured surfaces and thin films, which is expected to enhance the optical and sensing performance.

scholarly journals Anisotropic Gold Nanoparticle-Cell Interactions Mediated by Collagen

Materials ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1131 ◽  
Author(s):  
Oana Marișca ◽  
Nicolae Leopold
Keyword(s):  
In Vitro Cytotoxicity ◽  
Synthetic Approach ◽  
Physico Chemical ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Potential Applications ◽  
Internalization Rate ◽  
Enhanced Raman Scattering ◽  
Further Development

Gold nanoparticles (AuNPs) are the groundwork of a large variety of applications in the biomedical field. Further development and a better understanding of this versatile platform will lead to an expansion of potential applications. In this study, we propose a facile synthesis of AuNPs using hydrogen peroxide as a reducing agent and collagen as a stabilizing agent. Our synthetic approach results in “raspberry”-like AuNPs with a mean diameter of 60 nm, as revealed by electron microscopy. The optical properties of the AuNPs were assessed by UV-Vis and surface-enhanced Raman scattering (SERS), and their stability and in vitro cytotoxicity were evaluated as well. HeLa cell viability values were only modestly affected compared to control, with the highest concentration tested displaying a 20% decrease in cellular viability. The dose-dependent cellular internalization in the 20–60 nM range indicate the highest internalization rate at 60 nM and uptake values as high as 35%. This result correlated well with the viability results. These type of anisotropic AuNPs are proposed for biomedical applications such as hyperthermia, contrast agents or imaging. Therefore, our findings offer a platform for potential biological applications such as sensing and imaging, due to their unique physico-chemical features.

Nanostructured materials for applications in surface-enhanced Raman scattering

CrystEngComm ◽  
2014 ◽  
Vol 16 (43) ◽  
pp. 9959-9973 ◽  
Author(s):  
Xiaochun Chen ◽  
Changlong Jiang ◽  
Shaoming Yu
Keyword(s):  
Raman Scattering ◽  
Nanostructured Materials ◽  
Point Of View ◽  
Synthesis Methods ◽  
The Novel ◽  
Sers Substrates ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Potential Applications ◽  
Enhanced Raman Scattering

This highlight summarizes current advances in the design and the employment of nanostructured materials in SERS substrates especially from the dimensional point of view. We then talk about synthesis methods and the novel properties of these nanostructured materials with their potential applications in SERS.

scholarly journals Recent Advances in Metallic Nanoparticle Assemblies for Surface-Enhanced Spectroscopy

2021 ◽  
Vol 23 (1) ◽  
pp. 291
Author(s):  
Beata Tim ◽  
Paulina Błaszkiewicz ◽  
Michał Kotkowiak
Keyword(s):  
Metallic Nanoparticles ◽  
Surface Enhanced Raman Spectroscopy ◽  
Localized Surface Plasmon ◽  
Metallic Nanoparticle ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Potential Applications ◽  
Enhanced Raman Scattering ◽  
The Impact ◽  
Recent Attention

Robust and versatile strategies for the development of functional nanostructured materials often focus on assemblies of metallic nanoparticles. Research interest in such assemblies arises due to their potential applications in the fields of photonics and sensing. Metallic nanoparticles have received considerable recent attention due to their connection to the widely studied phenomenon of localized surface plasmon resonance. For instance, plasmonic hot spots can be observed within their assemblies. A useful form of spectroscopy is based on surface-enhanced Raman scattering (SERS). This phenomenon is a commonly used in sensing techniques, and it works using the principle that scattered inelastic light can be greatly enhanced at a surface. However, further research is required to enable improvements to the SERS techniques. For example, one question that remains open is how to design uniform, highly reproducible, and efficiently enhancing substrates of metallic nanoparticles with high structural precision. In this review, a general overview on nanoparticle functionalization and the impact on nanoparticle assembly is provided, alongside an examination of their applications in surface-enhanced Raman spectroscopy.

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