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      The highly sensitive determination of serotonin by using gold nanoparticles (Au NPs) with a localized surface plasmon resonance (LSPR) absorption wavelength in the visible region†

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          Abstract

          The development of improved methods for the synthesis of monodisperse gold nanoparticles (Au NPs) is of high priority because they can be used as substrates for surface-enhanced Raman scattering (SERS) applications relating to biological lipids. Herein, Au NPs have been successfully synthesized via a seed-mediated growth method. The LSPR peak is controlled via adjusting the gold nanoseed component, and different fabrication methods were studied to establish the effect of sonication time on NP size. The simple, facile, and room-temperature method is based on a conventional ultrasonic bath, which leads to ultrasonic energy effects on the size and morphology of the Au NPs. This research offers new opportunities for the production of highly monodispersed spherical Au NPs without the use of a magnetic stirrer method, as evidenced by ultraviolet-visible reflectance spectra and scanning electron microscopy (SEM) analysis. SEM images indicate that the spherical Au NP colloidal particles are stable and reliable, which paves the way for their use as a nanostructured biosensor platform that can be exploited for multiple applications, for example, in materials science, sensing, catalysis, medicine, food safety, biomedicine, etc. The highest enhancement factor that could be achieved in terms of the SERS enhancement activity of these Au NP arrays was determined using 10 −9 M serotonin (5-hydroxytryptamine, 5-HT) as the Raman probe molecules.

          Abstract

          The development of improved methods for the synthesis of monodisperse gold nanoparticles (Au NPs) is of high priority because they can be used as substrates for surface-enhanced Raman scattering (SERS) applications relating to biological lipids.

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          THE CHEMICAL EFFECTS OF HIGH FREQUENCY SOUND WAVES I. A PRELIMINARY SURVEY

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            Surface-enhanced Raman spectroscopy (SERS): an adventure from plasmonic metals to organic semiconductors as SERS platforms

            The recent focus on SERS-active materials has shifted from conventional plasmonic surfaces to alternative 3D structures and semiconductors. The quantitative determination and identification of bio-/chemical molecules at ultra-low concentrations is a hot topic in several fields including medical diagnostics, environmental science, and homeland security. Molecular detection techniques are conventionally based on optical, electrochemical, electronic, or gravimetric methodologies. Among these methods, surface-enhanced Raman spectroscopy (SERS) is considered as one of the most reliable, sensitive and selective techniques for non-destructive molecular analysis through the amplification of electromagnetic fields and/or creation of charge-transfer states between the chemisorbed analyte molecule and SERS active platform. Unfortunately, the applicability of SERS is rather limited, which is mainly due to the lack of highly sensitive SERS platforms with good stability and reproducibility. In line with this, metal nanoparticles ( e.g. , Au, Ag, and Cu) have been extensively exploited as SERS active platforms. Although the utilization of metallic nanoparticles in SERS is simple and cost-effective, the poor controllability of the structures and limited formation of hot spots in the detection zone leads to discrepancy in the resulting SERS signals. For these reasons, in the past few years, researchers have focused on fabricating 3-dimensional (3D) SERS platforms, which increase the adsorption of analyte molecules and facilitate hot spot formation in all three dimensions. However, the fabrication of 3D SERS platforms is mostly expensive and technologically demanding. Therefore, the discovery of non-metal alternative approaches is of great interest not only to widen SERS applications but to further elucidate fundamental questions. Considering recent developments on the fabrication and application of SERS active platforms, this review is structured in 3 main directions; (1) implementation of the plasmonic nanoparticles having different shapes into SERS-active platforms, (2) highlighting recent developments in the fabrication and application of 3D SERS-active platforms, and (3) examination of recent novel inorganic and organic semiconductor based platforms for SERS applications. At the end, we conclude with the promises and challenges for the future evolution of SERS.
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              Fundamentals of Photonics

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                Author and article information

                Journal
                RSC Adv
                RSC Adv
                RA
                RSCACL
                RSC Advances
                The Royal Society of Chemistry
                2046-2069
                20 August 2020
                17 August 2020
                20 August 2020
                : 10
                : 51
                : 30858-30869
                Affiliations
                [a] Faculty of Materials Science and Technology, University of Science Ho Chi Minh City Viet Nam ttnhoa@ 123456hcmus.edu.vn
                [b] Vietnam National University Ho Chi Minh City Viet Nam
                [c] Tissue Engineering and Regenerative Medicine Laboratory, Department of Biomedical Engineering, International University Ho Chi Minh City Viet Nam
                [d] Center for Innovative Materials and Architectures (INOMAR) Ho Chi Minh City Viet Nam
                [e] Department of Nano-Physics, Gachon University Seongnam-si Gyeonggi-do 13120 Republic of Korea
                [f] Laboratory of Advanced Materials, University of Science Ho Chi Minh City Viet Nam
                [g] Future Materials and Devices Laboratory, Institute of Fundamental and Applied Sciences, Duy Tan University Ho Chi Minh City 700000 Viet Nam
                [h] Faculty of Environmental and Chemical Engineering, Duy Tan University Da Nang 550000 Viet Nam
                [i] Department of Industrial Environmental Engineering, College of Industrial Environmental Engineering, Gachon University Seongnam-si Gyeonggi-do 13120 Republic of Korea
                Author notes
                [‡]

                P. Q. T. D. and V. T. H. contributed equally to this work.

                Author information
                https://orcid.org/0000-0003-0223-7864
                https://orcid.org/0000-0002-5318-4742
                https://orcid.org/0000-0002-1530-2402
                Article
                d0ra05271j
                10.1039/d0ra05271j
                9056339
                35516028
                031e78fb-1f2b-4b23-b0ae-59a17b13e78e
                This journal is © The Royal Society of Chemistry
                History
                : 16 June 2020
                : 5 August 2020
                Page count
                Pages: 12
                Funding
                Funded by: National Foundation for Science and Technology Development, doi 10.13039/100007224;
                Award ID: 103.03-2019.379
                Funded by: Viet Nam National University Ho Chi Minh City, doi 10.13039/501100010712;
                Award ID: Unassigned
                Categories
                Chemistry
                Custom metadata
                Paginated Article

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