Nanoscale flexible Ag grating/AuNPs self-assembly hybrid for ultra-sensitive sensors

Dong, Jun; Cao, Yi; Han, Qingyan; Gao, Wei; Li, Tuo; Qi, Jianxia

doi:10.1088/1361-6528/abd7b2

Cited by 20 publications

(13 citation statements)

References 53 publications

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“…In the range of 400−1800 cm −1 , the characteristic peaks of Rh6G at 614, 772, 1185, 1310, 1359, 1507, 1576, and 1650 cm −1 can be clearly seen, which is consistent with the literature reports. 32 At the same time, we also observed that the Raman strength weakened with a decrease in the concentration of probe molecules until a concentration of 10 −12 M was reached, which was the substrate detection limit under the current test conditions. Therefore, it can be shown that the enhancement of the local electromagnetic field at the edge and corner binding gap between four adjacent Au@Ag NCs can effectively improve the Raman scattering signal of the probe molecule and thus greatly improve the detection sensitivity.…”

Section: Sers Measurement Of the Au@ag Ncsupporting

confidence: 58%

“…The enhancing factor (EF) is one of the significant factors to evaluate the SERS substrate. We used the following formula to calculate the EF of the APM Raman signal of the island membrane installed Au@Ag NC array substrate where I RS and C RS are the Raman response strength and APM concentration of the control sample, respectively.…”

Section: Sers Measurement Of the Au@ag Nc Monolayer Film With Differe...mentioning

confidence: 64%

“…Among these, the former two mentioned are called fluid interface self-assembly, which is realized using amphiphilic molecular characteristics and the method of increasing interface pressure or Marangoni effect. Typical methods include Langmuir–Blodgett (LB) membrane assembly, two-phase liquid–liquid self-assembly, three-phase liquid–liquid self-assembly, etc. In evaporation-induced self-assembly, a colloidal solution is placed under appropriate temperature and humidity conditions, resulting in the formation of nanoparticles in an ordered array of nanostructures through the interaction of electrostatic repulsion force, van der Waals force, and energy dissipation among nanoparticles in the solution .…”

Section: Resultsmentioning

confidence: 99%

“…Based on this substrate, we measure Rh6G Raman spectra with concentrations of 10 –8 –10 –12 M to explore the sensitivity of the island membrane Au@Ag NC array substrate and the detection limit of probe molecules (Rh6G), as shown in Figure b. In the range of 400–1800 cm –1 , the characteristic peaks of Rh6G at 614, 772, 1185, 1310, 1359, 1507, 1576, and 1650 cm –1 can be clearly seen, which is consistent with the literature reports . At the same time, we also observed that the Raman strength weakened with a decrease in the concentration of probe molecules until a concentration of 10 –12 M was reached, which was the substrate detection limit under the current test conditions.…”

Section: Sers Measurement Of the Au@ag Nc Monolayer Film With Differe...mentioning

confidence: 99%

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Two-Dimensional Self-Assembly of Au@Ag Core–Shell Nanocubes with Different Permutations for Ultrasensitive SERS Measurements

Dong

Yang

et al. 2022

ACS Omega

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Different self-assembly methods not only directly change the arrangement of noble metal particles on the substrate but also indirectly affect the local electromagnetic field distribution and intensity of the substrate under specific optical excitation conditions, which leads to distinguished different enhancement effects of the structure on molecular Raman signals. In this paper, first, the gold species growth method was used to prepare the silver-coated gold nanocubes (Au@Ag NCs) with regular morphology and uniform size, and then the two-phase and three-phase liquid–liquid self-assembly and evaporation-induced self-assembly methods were used to obtain the substrate structure with different NC arrangement patterns. The optimal arrangement of NCs was found by transverse comparison of Raman signal detection of probe molecules with the same concentration. Subsequently, surface-enhanced Raman scattering (SERS) measurements of Rhodamine (Rh6G) and aspartame (APM) were carried out. Furthermore, the finite element method (FEM) was employed to calculate the local electromagnetic fields of the substrates with different Au@Ag NC arrangements, and the calculated results were in agreement with the experimental results. The experimental results show that the SERS-active substrate was largely associated with the different arrangements of Au@Ag NCs, and the island membrane Au@Ag NCs array substrate obtained by evaporation-induced self-assembly can generate a strong local electromagnetic field due to the edge and corner bonding gap between the tightly arranged NCs; this endows the substrate with benign sensitivity and reproducibility and has great potential in molecular detection, biosensing, and food safety monitoring.

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Section: Sers Measurement Of the Au@ag Ncsupporting

confidence: 58%

Section: Sers Measurement Of the Au@ag Nc Monolayer Film With Differe...mentioning

confidence: 64%

Section: Resultsmentioning

confidence: 99%

Section: Sers Measurement Of the Au@ag Nc Monolayer Film With Differe...mentioning

confidence: 99%

See 2 more Smart Citations

Two-Dimensional Self-Assembly of Au@Ag Core–Shell Nanocubes with Different Permutations for Ultrasensitive SERS Measurements

Dong

Yang

et al. 2022

ACS Omega

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“…That PAPs are not devoid of organelles has also been reported by other groups. For instance, multiple PAP organelles were recently identified applying novel techniques of tissue fixation, such as high-pressure freezing and freeze substitution that better preserve fine subcellular structure (Zuber et al, 2005;Akagi et al, 2006;Möbius et al, 2010;Sahlender et al, 2014). Similarly, vesicles within the fine astrocytic processes were described in several EM studies performed on ''gliosomes,'' an in vitro preparation of glial subcellular particles often used to study mechanisms of astrocytic transmitter uptake and release (Milanese et al, 2009;Cervetto et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

Characterization of Subcellular Organelles in Cortical Perisynaptic Astrocytes

Alaoui

Jackson

Fabri

et al. 2021

Front. Cell. Neurosci.

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Perisynaptic astrocytic processes (PAPs) carry out several different functions, from metabolite clearing to control of neuronal excitability and synaptic plasticity. All these functions are likely orchestrated by complex cellular machinery that resides within the PAPs and relies on a fine interplay between multiple subcellular components. However, traditional transmission electron microscopy (EM) studies have found that PAPs are remarkably poor of intracellular organelles, failing to explain how such a variety of PAP functions are achieved in the absence of a proportional complex network of intracellular structures. Here, we use serial block-face scanning EM to reconstruct and describe in three dimensions PAPs and their intracellular organelles in two different mouse cortical regions. We described five distinct organelles, which included empty and full endosomes, phagosomes, mitochondria, and endoplasmic reticulum (ER) cisternae, distributed within three PAPs categories (branches, branchlets, and leaflets). The majority of PAPs belonged to the leaflets category (~60%), with branchlets representing a minority (~37%). Branches were rarely in contact with synapses (<3%). Branches had a higher density of mitochondria and ER cisternae than branchlets and leaflets. Also, branches and branchlets displayed organelles more frequently than leaflets. Endosomes and phagosomes, which accounted for more than 60% of all the organelles detected, were often associated with the same PAP. Likewise, mitochondria and ER cisternae, representing ~40% of all organelles were usually associated. No differences were noted between the organelle distribution of the somatosensory and the anterior cingulate cortex. Finally, the organelle distribution in PAPs did not largely depend on the presence of a spine apparatus or a pre-synaptic mitochondrion in the synapse that PAPs were enwrapping, with some exceptions regarding the presence of phagosomes and ER cisternae, which were slightly more represented around synapses lacking a spine apparatus and a presynaptic mitochondrion, respectively. Thus, PAPs contain several subcellular organelles that could underlie the diverse astrocytic functions carried out at central synapses.

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Electrochemical Synthesis of Fractal Nanostructures for Efficient Surface-Enhanced Raman Spectroscopy

Wang

et al. 2023

Plasmonics

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Nanoscale flexible Ag grating/AuNPs self-assembly hybrid for ultra-sensitive sensors

Cited by 20 publications

References 53 publications

Two-Dimensional Self-Assembly of Au@Ag Core–Shell Nanocubes with Different Permutations for Ultrasensitive SERS Measurements

Two-Dimensional Self-Assembly of Au@Ag Core–Shell Nanocubes with Different Permutations for Ultrasensitive SERS Measurements

Characterization of Subcellular Organelles in Cortical Perisynaptic Astrocytes

Electrochemical Synthesis of Fractal Nanostructures for Efficient Surface-Enhanced Raman Spectroscopy

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