High density Ag nanobranches decorated with sputtered Au nanoparticles for surface-enhanced Raman spectroscopy

Kim, Yong-Tae; Schilling, Joerg; Schweizer, Stefan L.; Wehrspohn, Ralf B.

doi:10.1016/j.apsusc.2017.02.167

Cited by 20 publications

(14 citation statements)

References 30 publications

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“…Branched nanostructures feature many multi-level branching nanostructures that allows abundant interbranch gaps/junctions, edges, corners, and large surfaceto-volume ratio, all of which can avail surface-sensitive applications such as localized surface plasmon resonance (LSPR), SERS, and catalysis [22][23][24][25][26][27][28][29][30]. Therefore, the branched nanostructure is a suitable bifunctional substrate with both plasmonic/SERS and catalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Improved SERS Performance and Catalytic Activity of Dendritic Au/Ag Bimetallic Nanostructures Based on Ag Dendrites

Cheng

Yao

et al. 2020

Nanoscale Res Lett

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Bimetallic nanomaterials, which exhibit a combination of the properties associated with two different metals, have enabled innovative applications in nanoscience and nanotechnology. Here, we introduce the fabrication of dendritic Au/Ag bimetallic nanostructures for surface-enhanced Raman scattering (SERS) and catalytic applications. The dendritic Au/Ag bimetallic nanostructures were prepared by combining the electrochemical deposition and replacement reaction. The formation of Au nanoparticle shell on the surface of Ag dendrites greatly improves the stability of dendritic nanostructures, followed by a significant SERS enhancement. In addition, these dendritic Au/Ag bimetallic nanostructures are extremely efficient in degrading 4-nitrophenol (4-NP) compared with the initial dendritic Ag nanostructures. These experimental results indicate the great potential of the dendritic Au/Ag bimetallic nanostructures for the development of excellent SERS substrate and highly efficient catalysts.

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Section: Introductionmentioning

confidence: 99%

Improved SERS Performance and Catalytic Activity of Dendritic Au/Ag Bimetallic Nanostructures Based on Ag Dendrites

Cheng

Yao

et al. 2020

Nanoscale Res Lett

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“…The most commonly used method to produce AAO-based LSPR systems is to grow a layer of AAO on the surface of a thin Al film deposited on the surface of the prism. LSPR biosensors have attracted attention over the past decade by offering high sensitivity (Amanda et al, 2004), a small footprint (Chen et al, 2009), and non-chemical labeling (Hammond et al, 2014;Kim et al, 2017c). Capability for spontaneous detection gives the LSPR potential for diagnostic and point-of-care testing (POCT) (Endo et al, 2005;Acimovic et al, 2014;Chen et al, 2015;Yoshikawa et al, 2015;Oh et al, 2016).…”

Section: Surface Plasmon Resonancementioning

confidence: 99%

Advanced Nanoporous Anodic Alumina-Based Optical Sensors for Biomedical Applications

Feng

2021

Front. Nanotechnol.

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Close-packed hexagonal array nanopores are widely used both in research and industry. A self-ordered nanoporous structure makes anodic aluminum oxide (AAO) one of the most popular nanomaterials. This paper describes the main formation mechanisms for AAO, the AAO fabrication process, and optical sensor applications. The paper is focused on four types of AAO-based optical biosensor technology: surface-Enhanced Raman Scattering (SERS), surface Plasmon Resonance (SPR), reflectometric Interference Spectroscopy (RIfS), and photoluminescence Spectroscopy (PL). AAO-based optical biosensors feature very good selectivity, specificity, and reusability.

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“…An important part of SERS is a nanostructure of noble metal that is decorated on the SERS surface. SERS can enhance the Raman signal detected by a Raman spectroscope more than one million times because of plasmonic resonance [10]. This phenomenon occurs by vibration of free-electron clouds at the surface of the noble metal.…”

Section: Introductionmentioning

confidence: 99%

“…Some SERS featured non-uniform Ag distribution, uncontrollable amounts of nanoparticles, and were difficult to handle, such as the paper/filter-based SERS [15,16]. Kim et al [10] produced a handy SERS with Ag decoration in 2017. The SERS presented a significant Raman enhancement; however, easy oxidation in the air was still a major problem with this noble metal.…”

Section: Introductionmentioning

confidence: 99%

Efficiency of Raman Signal Enhancement by Ag and Au/Ag Nanoparticles Decorated on Aluminum Sheet SERS

Limwichean

Pangpaiboon

Phetnam

et al. 2021

Curr. Appl. Sci. Technol.

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Surface Enhance Raman Spectroscopy (SERS) is a well-known technique used to analyze solutions of various substances that are at very low concentration levels. To create plasmonic resonance, many researchers have used Au nanoparticles decorated on SERS. Although Au nanoparticles offer high efficiency and high stability, they are expensive. An inexpensive noble metal with high numbers of free electrons, Ag nanoparticles has become an interesting alternative. However, Ag has a major drawback because it is easily oxidized. Therefore, this research aims to combine the good properties between Au and Ag nanoparticles for Raman signal enhancement. A low-cost laser marking technique was used to engrave aluminum surface. The Au/Ag nanoparticles were co-sputtered on the aluminum template with decorating times ranging from 30-360 s. FE-SEM was used to characterize the nanostructure of the nanoparticles on SERS. Hydrophobic properties of the SERS surface were identified by contact angle measurement. A Raman spectrometer was used to measure the intensity of the enhanced Raman signal. From the results, the decorating time that provided the highest contact angle and highest Raman intensity enhancement was 270 s for both Ag and Au/Ag nanoparticles. The limit of detection of Ag and Au/Ag aluminum SERS was 10-8 M for Rhodamine-6 G. The enhancement factor for Ag aluminum SERS was slightly greater than that for Au/Ag aluminum SERS, as expected. After 60 days of shelf-life testing, Ag aluminum SERS presented the highest Raman enhancement. However, the Raman signal from Ag aluminum SERS dramatically decreased, afterwards. On the other hand, Au/Ag aluminum SERS showed a constant ability to enhance the Raman signal for as long as 150 days.

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High density Ag nanobranches decorated with sputtered Au nanoparticles for surface-enhanced Raman spectroscopy

Cited by 20 publications

References 30 publications

Improved SERS Performance and Catalytic Activity of Dendritic Au/Ag Bimetallic Nanostructures Based on Ag Dendrites

Improved SERS Performance and Catalytic Activity of Dendritic Au/Ag Bimetallic Nanostructures Based on Ag Dendrites

Advanced Nanoporous Anodic Alumina-Based Optical Sensors for Biomedical Applications

Efficiency of Raman Signal Enhancement by Ag and Au/Ag Nanoparticles Decorated on Aluminum Sheet SERS

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