Unusual Circularly Polarized Photocatalytic Activity in Nanogapped Gold–Silver Chiroplasmonic Nanostructures

Hao, Changlong; Xu, Liguang; Ma, Wei; Wu, Xiaoling; Wang, Libing; Kuang, Hua; Xu, Chuanlai

doi:10.1002/adfm.201502429

Cited by 124 publications

(115 citation statements)

References 61 publications

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“…From the high resolution TEM image, it is confirmed that there is no distinct gap between the Au core and the Ag shell layer (Figure b,ii), which is consistent with our previous observation on Au@BDT@Ag core–shell rod‐like nanoprobes . The Au@BDT@Ag suspension shows a yellow color and the corresponding LSPR peak blueshifts to 426 nm (Figure c,iii), which further indicates the successful coating of the Ag shell . The calculated extinction spectrum of a Au@Ag core–shell NP (24 nm for the diameter of the Au core and 20 nm for the Ag shell thickness, without internal gaps in the simulation model) by the finite difference time domain (FDTD) method well fits the experimental extinction spectrum (dashed line in Figure c), which also suggests that no internal gaps exist in the Au@BDT@Ag NPs.…”

Section: Resultssupporting

confidence: 88%

“…[63] The Au@BDT@Ag suspension shows a yellow color and the corresponding LSPR peak blueshifts to 426 nm (Figure 2c,iii), which further indicates the successful coating of the Ag shell. [27,64,65] The calculated extinction spectrum of a Au@Ag core-shell NP (24 nm for the diameter of the Au core and 20 nm for the Ag shell thickness, without internal gaps in the simulation model) by the finite difference time domain (FDTD) method well fits the experimental extinction spectrum (dashed line in Figure 2c), which also suggests that no internal gaps exist in the Au@BDT@Ag NPs. The calculated electric field intensity (E/E 0 ) map shows strong near-field enhancements mainly distributed on the external surface of the Ag shell (inset in Figure 2c), which implies a potential strong Raman enhancement for any molecule adsorbed on the Ag shell surface.…”

Section: Figure 2amentioning

confidence: 65%

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Surface‐Enhanced Raman Nanoprobes with Embedded Standards for Quantitative Cholesterol Detection

et al. 2018

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Cholesterol is an essential molecule for many processes in the human body and many diseases such as hypertension, coronary heart disease, atherosclerosis, and lipid metabolism dysfunction can be detected in their early stages by monitoring intracellular cholesterol levels. Herein, metallic surface‐enhanced Raman scattering (SERS) core–shell nanoparticles with an embedded standard are designed for nondestructive detection of H2O2 and cholesterol. A classical least squares (CLS) spectral fitting method allows one to accurately extract the SERS signals of internal standards and target molecules from the multiplexed spectra. The embedded internal standard can be used to calibrate the SERS signals, removing fluctuations induced by differing measurement conditions and local states of the nanoparticles, such as aggregation. Thus, SERS signal reproducibility is improved and a better linear relationship in the working curve of detection is achieved. Using these SERS nanoprobes quantitative detection of H2O2 and cholesterol in solution and inside live cells at a single‐cell level is demonstrated.

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Section: Resultssupporting

confidence: 88%

Section: Figure 2amentioning

confidence: 65%

Surface‐Enhanced Raman Nanoprobes with Embedded Standards for Quantitative Cholesterol Detection

et al. 2018

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“…With the fast development of bottom‐up and top‐down approaches for the sample synthesis and fabrication, the chiral study has been generally extended from traditional molecules to metal nanostructures, such as noble metal nanoparticle (NPs), chiral metamaterials and chiral photonic crystal . Several promising applications, such as biosensing, chiral catalysis, polarization tuning, and ultrasensitive detections, have been reported.…”

Section: Introductionmentioning

confidence: 99%

Plasmonic Circular Dichroism of Gold Nanoparticle Based Nanostructures

Meng

Lin

et al. 2019

Advanced Optical Materials

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IntroductionChirality refers to the certain handedness in geometry with a mirror image that cannot coincide with itself. [1] Mirror images with opposite chirality are enantiomers, and can be divided into left-and right-handedness, respectively. Two enantiomers can interact differently with left-(LCP) and right-circularly With great advances in wet chemical synthesis of nanoparticles (NPs), plasmonic NPs with various sizes and morphologies are easily available nowadays and demonstrate great potentials in optical, electronic, and biomedical applications. Plasmonic circular dichroism (CD), relating to circular dichroism responses at localized surface plasmon resonance of metal nanostructures, has emerged as a research direction of plasmonics with promising prospects in enantioselective catalysis, chiral separation, and ultrasensitive detections. Herein, plasmonic CD responses of gold nanoparticle based nanostructures are summarized. Two kinds of plasmonic CD phenomena are investigated: structural CD and induced CD. Structural CD is the response from chiral assemblies composed of plasmonic NPs with strong dipole-dipole interactions. Induced CD is the response of nonchiral plasmonic NPs with chiral molecules attached at surface. The weak CD is the result of Coulomb interaction between chiral molecules and plasmonic NPs. Efforts on how to achieve strong CD signals for these two configurations by using chiral molecules and Au nanoparticles are reported. The fabrication of chiral nanostructures, tuning and amplification of CD responses, CD-based biosensors, chiral catalysis, and future perspectives are presented. The importance of the shape anisotropy of gold nanorods in the generation and amplification of CD signals is especially highlighted.

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“…[1][2][3][4][5] Accurate fabrication of regiospecific plasmonic assemblies is crucial for understanding the coherent interactions among constituent nanoparticles. [1][2][3][4][5] Accurate fabrication of regiospecific plasmonic assemblies is crucial for understanding the coherent interactions among constituent nanoparticles.…”

mentioning

confidence: 99%

“…

Plasmonic nanoparticles and their assemblies have become prominent building blocks for widespread applications in nanotechnology such as metamaterials, biosensors, and photonic and optoelectronic devices. [1][2][3][4][5] Accurate fabrication of regiospecific plasmonic assemblies is crucial for understanding the coherent interactions among constituent nanoparticles. [6][7][8][9] Therefore, various surface modification strategies of plasmonic nanoparticles have been proposed toward their self-assembly in a prescribed and directional manner.

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mentioning

confidence: 99%

Spiral Patterning of Au Nanoparticles on Au Nanorod Surface to Form Chiral AuNR@AuNP Helical Superstructures Templated by DNA Origami

et al. 2017

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Plasmonic motifs with precise surface recognition sites are crucial for assembling defined nanostructures with novel functionalities and properties. In this work, a unique and effective strategy is successfully developed to pattern DNA recognition sites in a helical arrangement around a gold nanorod (AuNR), and a new set of heterogeneous AuNR@AuNP plasmonic helices is fabricated by attaching complementary-DNA-modified gold nanoparticles (AuNPs) to the predesigned sites on the AuNR surface. AuNR is first assembled to one side of a bifacial rectangular DNA origami, where eight groups of capture strands are selectively patterned on the other side. The subsequently added link strands make the rectangular DNA origami roll up around the AuNR into a tubular shape, therefore giving birth to a chiral patterning of DNA recognition sites on the surface of AuNR. Following the hybridization with the AuNPs capped with the complementary strands to the capture strands on the DNA origami, left-handed and right-handed AuNR@AuNP helical superstructures are precisely formed by tuning the pattern of the recognition sites on the AuNR surface. Our strategy of nanoparticle surface patterning innovatively realizes hierarchical self-assembly of plasmonic superstructures with tunable chiroptical responses, and will certainly broaden the horizon of bottom-up construction of other functional nanoarchitectures with growing complexity.

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Unusual Circularly Polarized Photocatalytic Activity in Nanogapped Gold–Silver Chiroplasmonic Nanostructures

Cited by 124 publications

References 61 publications

Surface‐Enhanced Raman Nanoprobes with Embedded Standards for Quantitative Cholesterol Detection

Surface‐Enhanced Raman Nanoprobes with Embedded Standards for Quantitative Cholesterol Detection

Plasmonic Circular Dichroism of Gold Nanoparticle Based Nanostructures

Spiral Patterning of Au Nanoparticles on Au Nanorod Surface to Form Chiral AuNR@AuNP Helical Superstructures Templated by DNA Origami

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