Understanding metal-enhanced fluorescence and structural properties in Au@Ag core–shell nanocubes

Jung, Daewoong; Kim, Jun Min; Woo, Han Young; Yi, Gi‐Ra; Cho, Jung Young; Jung, Haeun; Lee, Gaehang; Chae, Weon‐Sik; Nam, Ki Min

doi:10.1039/c9ra05103a

Cited by 11 publications

(10 citation statements)

References 30 publications

(32 reference statements)

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“…Only crystalline Au peaks of 38.2 and 44.5 can be observed (black and red line), which depict typical (111) and (200) facets of the face-center-cube (fcc) phase state, respectively. 29 After being annealed at 200 °C, the hetero-nanostructures show two other prominent diffraction peaks indexed to the (200) and (220) planes of fcc GST. However, the diffraction peaks of fcc GST gradually disappeared with the increase in the annealing temperature.…”

Section: Phase State Modulation By Thermal Annealingmentioning

confidence: 99%

Tunable Optical Response Based on Au@GST Core–Shell Hetero-nanostructures

Han

Yuan

et al. 2021

ACS Appl. Nano Mater.

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Active control over the optical response has been investigated extensively, which is highly required in next-generation photonic devices. Here, we report a core−shell nanostructure combined with the plasmonic nanostructure with an active phase change material, termed as Au@GST, where the individual Au nanoparticle is wrapped by isolated active Ge 2 Sb 2 Te 5 (GST) tuning medium as the shell. We demonstrate the active control of optical response by the simultaneous control of size and crystallization degree of the phase change shell within each isolated core−shell nanostructure. The hetero-nanostructures are synthesized by direct sputtering of stoichiometric GST on Au nanoparticles with different sizes based on a seeding effect of the metal nanostructures. The tunable optical response is enabled by inducing the GST shell phase states between amorphous and crystalline phases through thermal annealing, accompanied by high optical contrast. We demonstrate the tunable optical response (from 570 to 630 nm) of the hetero-nanostructures by tailoring the GST shell's optical property. The experimental results show that the optical response of the Au@GST core−shell hetero-nanostructures exhibits high sensitivity to the size of the nanoparticles (GST thickness and Au diameter). The simulation results are in good agreement with the experiments. This confirms the dominant role of the phase states on the optical modulation. Furthermore, this study provides a single-step and lithography-free 3D printing process to arrange the hybrid Au@GST core−shell nanostructures in a large area deliberately, giving additional flexibility to control over the architecture and geometry. Such Au@GST core−shell hetero-nanostructures have the potential for active control of nanophotonic devices, such as super-resolution imaging and programmable metasurfaces.

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Section: Phase State Modulation By Thermal Annealingmentioning

confidence: 99%

Tunable Optical Response Based on Au@GST Core–Shell Hetero-nanostructures

Han

Yuan

et al. 2021

ACS Appl. Nano Mater.

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“…Nanocubes have been widely used in the study of nonlinear optics, Raman scattering effects, and catalytic reactions due to their easy coupling of 8 vertices and 12 edges under specific excitation conditions. − They can generate strong local electromagnetic fields utilizing their core–shell structure and bimetallic synergism characteristics. As a result, an increasing number of researchers are beginning to pay attention to the application of Au@Ag NCs in related areas.…”

Section: Resultsmentioning

confidence: 99%

Preparation of a Three-Dimensional Composite Structure Based on a Periodic Au@Ag Core–Shell Nanocube with Ultrasensitive Surface-Enhanced Raman Scattering for Rapid Detection

Dong

Zhou

Yang

et al. 2023

ACS Appl. Mater. Interfaces

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The absorption and scattering frequencies of surface plasmon resonance can be selectively adjusted by changing the morphology, size, structure, arrangement, and gap between noble metal nanoparticles so that the local electromagnetic field on the substrate surface can be further enhanced. This change will promote and popularize surface-enhanced Raman spectroscopy. This paper reports the research results and improvement scheme of surface enhanced Raman scattering (SERS) activity of silver-coated gold nanocubed/organism (Au@Ag/CW NCs) prepared by three-phase self-assembly. In the experiment, the uppermost oil phase in the three-phase self-assembly process was optimized as ethanol and n-hexane solution containing a specific concentration of a probe molecule rhodamine 6G or aspartame. The probe molecules were directly self-assembled on the surface of the composite substrate to avoid the possible loss and pollution during immersion and preservation and achieve the purpose of rapid detection. The results show that the Au@Ag/CW NC array substrate is a periodic cubic ring structure. The sensitivity, uniformity, reproducibility, and stability of composite Au@Ag/CW NC array substrates are verified by comparing the Raman activities of various substrates. The feasibility of using the substrate to realize rapid SERS detection, compared with the advantages and disadvantages of the traditional soaking method, proved that the prepared substrate and improvement direction have excellent potential for application and development prospects in the field of rapid food additive detection.

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“…XRD characterization with a sharp diffraction pattern intensity and a small Full Widht at Half Maximum (FWHM) value indicates good crystallinity of the material. Based on standard Inorganic Crystal Structure Database (ICSD) number 04-0783 [14]. Diffraction pattern in Figure 3a shows four peaks with angles 2𝜃 are 38.14º, 44.30º, 64.64º, and 77.48º.…”

Section: Resultsmentioning

confidence: 99%

Application of Anisotropic Gold Nanomaterials in Plasmonic Sensors for Detection of Glyphosate

Iwantono,

Saputra,

Taufik Hidayat

et al. 2023

J. Phys.: Conf. Ser.

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The trend of using agrochemicals is increasing, especially glyphosate-based herbicides (GBH). The application of toxic chemicals as pest control in food crops carries a risk to human safety. Therefore, it is important to create a sensor for detection through Localized Surface Plasmon Resonance (LSPR) by utilizing anisotropic gold nanoparticles (AGN) to detect the presence of GBH contaminants in the form of malathion and temephos, with a detection level as low as three-part per million (ppm). AGN-based LSPR is successfully synthesized through an experimental technique using the Seed Mediated Growth Method (SMGM). The UV-Vis response showed two strong absorbances with a peak occurring around 500 to 600 nm, the peak within the transverse surface plasmon resonance range (t-SPR) corresponds to one aspect, while the peak within the spectral range extending from 700 nm to 900 nm corresponds to another aspect, namely Longitudinal Surface Plasmon Resonance (l-SPR). Anlysis of the FESEM photograph shows a structure consisting of two particles with different shapes, pentagonal pyramids and a bone shape. Pentagonal pyramids joined with a surface density of 64.43 ± 1,53 % and bone shape of 32,46 ± 1.53 %. This characterization shows strong and distinctive optical resonance in the near-infrared visible light spectrum, which is very suitable for LSPR sensors. It is necessary to fabricate an LSPR sensor device capable of detecting the presence of GBH by testing sensitivity, stability and repeatability. The sensitivity test results were evaluated by varying the synthesis time and concentration of contaminants in the AGN growth solution. It confirmed that the AGN-based LSPR sensor has a promising potential for GBH residue detection.

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Understanding metal-enhanced fluorescence and structural properties in Au@Ag core–shell nanocubes

Abstract: The unique ring-like building block of Au@AgNCs has dual optical functions as a fluorescence quencher and fluorescence enhancement medium.

Cited by 11 publications

References 30 publications

Tunable Optical Response Based on Au@GST Core–Shell Hetero-nanostructures

Tunable Optical Response Based on Au@GST Core–Shell Hetero-nanostructures

Preparation of a Three-Dimensional Composite Structure Based on a Periodic Au@Ag Core–Shell Nanocube with Ultrasensitive Surface-Enhanced Raman Scattering for Rapid Detection

Application of Anisotropic Gold Nanomaterials in Plasmonic Sensors for Detection of Glyphosate

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