Unique optical properties and applications of hollow gold nanospheres (HGNs)

Adams, Staci; Zhang, Jin Z.

doi:10.1016/j.ccr.2016.01.014

Cited by 48 publications

(33 citation statements)

References 360 publications

(471 reference statements)

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“…Hollow Au or AuAg nanostructures provide enhanced SERS activity compared to that of solid Ag nanoparticles [178,179,187,188,191,213,214]. Schwartzberg et al [188] compared the SERS activity of 30 nm hollow Au nanoparticles with those of solid Ag nanoparticles and reported a 10-fold increase in the SERS signal consistency and by using these hollow gold nanostructures as pH sensors, they have shown about two-fold increase in resolution and 10-fold increase in precision over the Ag nanoparticlebased SERS probes.…”

Section: Applications Of Hollow Nanostructures and Advantages Vs Solmentioning

confidence: 99%

Hollow metal nanostructures for enhanced plasmonics: synthesis, local plasmonic properties and applications

et al. 2016

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Metallic nanostructures have received great attention due to their ability to generate surface plasmon resonances, which are collective oscillations of conduction electrons of a material excited by an electromagnetic wave. Plasmonic metal nanostructures are able to localize and manipulate the light at the nanoscale and, therefore, are attractive building blocks for various emerging applications. In particular, hollow nanostructures are promising plasmonic materials as cavities are known to have better plasmonic properties than their solid counterparts thanks to the plasmon hybridization mechanism. The hybridization of the plasmons results in the enhancement of the plasmon fields along with more homogeneous distribution as well as the reduction of localized surface plasmon resonance (LSPR) quenching due to absorption. In this review, we summarize the efforts on the synthesis of hollow metal nanostructures with an emphasis on the galvanic replacement reaction. In the second part of this review, we discuss the advancements on the characterization of plasmonic properties of hollow nanostructures, covering the single nanoparticle experiments, nanoscale characterization via electron energy-loss spectroscopy and modeling and simulation studies. Examples of the applications, i.e. sensing, surface enhanced Raman spectroscopy, photothermal ablation therapy of cancer, drug delivery or catalysis among others, where hollow nanostructures perform better than their solid counterparts, are also evaluated.

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Section: Applications Of Hollow Nanostructures and Advantages Vs Solmentioning

confidence: 99%

Hollow metal nanostructures for enhanced plasmonics: synthesis, local plasmonic properties and applications

et al. 2016

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“…According to previous studies, HGN diameter strongly depends on the size of the cobalt scaffold . Consequently, good control of the nucleation and growth processes of cobalt scaffold can be used to control the particle size of HGNs.…”

Section: Discussionmentioning

confidence: 99%

“…After the as‐prepared cobalt scaffold solutions were exposed under the air atmosphere, they would be turned into colorless in the few minutes. This phenomenon was suggested as the oxidation of the cobalt scaffold . The rapid transformation resulted in the difficult characterization to understand the detail properties of cobalt scaffold.…”

Section: Discussionmentioning

confidence: 99%

“…A sacrificial cobalt scaffold is initially formed as Co 2+ is reduced by NaBH 4 under N 2 atomsphere. When the cobalt scaffold is exposed to Au ions, Au reduces onto the sacrificial scaffold as the cobalt oxidizes . Further oxidation of the cobalt scaffold leads to a hollow structure comprising a gold shell and a solvent‐filled dielectric core.…”

Section: Introductionmentioning

confidence: 99%

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Size‐Tunable Synthesis of Hollow Gold Nanospheres through Control of Reaction Temperature

Song

Zhang

et al. 2016

Part & Part Syst Charact

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Here, it is demonstrated that the size tunable hollow gold nanospheres (HGNs) of ≈24–122 nm in diameter can be facilely achieved by controlling a signal parameter, reaction temperature, in the synthesis. The varied particle sizes of HGNs result in highly tunable surface plasmon resonance (SPR) absorption in the entire visible to near infrared region of the spectrum, with maximum peak position from 565 to 850 nm when the reaction temperature is varied from 80 to 10 °C. The particle size and structural properties are determined using dynamic light scattering, transmission‐mode scanning electron microscopy, and high‐resolution transmission electron microscopy. The optical properties are characterized using UV–vis spectroscopy. A mechanism behind the temperature‐dependent HGN synthesis is explained by the thermodynamics of homogeneous nuclei formation of the cobalt scaffold. Discrete dipole approximation calculations are performed to simulate the SPR spectrum and provide insight into the relation between the SPR absorption and structural details of the HGNs. This study demonstrates a simple yet effective method based on temperature control for synthesizing produce size tunable HGNs with varying properties of interest for different applications.

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“…Consequently, they have shown significant potential for human cell or tissue analysis and would be particularly suitable for in vivo applications such as PTT. 91 As well as the spherical particles discussed thus far, rod- [92][93][94][95] and star-shaped nanostructures 96-100 also have optical properties that make them appropriate for use as NIR-SERS substrates, including for in vivo applications. Au nanostars have been used in Raman imaging for the detection of tumours of various cancer types at different stages.…”

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Surface-enhanced Raman spectroscopy for in vivo biosensing

et al. 2017

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| Surface enhanced Raman scattering (SERS) is of interest for biomedical analysis and imaging due to its sensitivity, specificity and multiplexing capabilities. The successful application of SERS for in vivo biosensing necessitates probes to be biocompatible and procedures to be minimally invasive, challenges that have respectively been met by the design of nanoprobes and instrumentation. This Review presents recent developments in these areas, describing case studies in which sensors have been implemented, as well as outlining shortcomings that have to be addressed before SERS sees clinical use.In 1928, C. V. Raman first reported the scattering phenomenon that now bears his name.1,2 Raman scattering has since become a powerful analytical technique, including for biomedical applications, 3 where label-free and objective tissue diagnostics 4-6 ex vivo and in vivo, as well as drug-cell interaction studies in vitro have been conducted. [7][8][9] The majority of incident photons experience elastic (Rayleigh) scattering, with only about 1 in 10 7 photons undergoing inelastic (Raman) scattering. 10 In 1974, Fleischmann and co-workers described a phenomenon that would later become known as surface enhanced Raman scattering (SERS) 11 . They observed a large enhancement in inelastic scattering from pyridine when the analyte was adsorbed onto a Ag electrode, an effect that had previously been mentioned by the team of A. J. McQuillan in 1973, 12 with Van Duyne later attributing the signal enhancement to the roughened metal surface via the physical phenomenon he coined SERS.13 Unlike conventional Raman spectroscopy, SERS analyses require samples to be labelled, a disadvantage offset by the large intensity enhancement that makes SERS an important analytical tool with high sensitivity and low detection limits.14,15 The exact mechanism of SERS is not fully understood but an electromagnetic enhancement factor plays the major role 16 , whereby free electrons in a metal nanoparticle (NP) encounter applied radiation whose electromagnetic field varies at a frequency matching the oscillation frequency of electrons in the NPs. Such plasmon resonance at the NP surface arises from an intense electric field, which intensifies Raman modes arising from molecules near or attached to the NP surface. The Raman signals can also be enhanced due to the formation of chargetransfer complexes between the roughened metal surface and molecules bound to it. We now leave our discussion of the SERS mechanism, but refer readers interested in these fundamental principles to some comprehensive articles on the subject. [17][18][19] Well-known selection rules allow for one to predict if a given vibrational mode is infrared-and/or Raman-active. Indeed, by considering the magnitude of the change in dipole moment or polarizability associated with a vibration, one can rationalize infrared or Raman data, respectively. Compared to Raman spectroscopy, SERS involves analyte molecules interacting with a roughened metal substrate, such that the symmetry ...

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Unique optical properties and applications of hollow gold nanospheres (HGNs)

Cited by 48 publications

References 360 publications

Hollow metal nanostructures for enhanced plasmonics: synthesis, local plasmonic properties and applications

Hollow metal nanostructures for enhanced plasmonics: synthesis, local plasmonic properties and applications

Size‐Tunable Synthesis of Hollow Gold Nanospheres through Control of Reaction Temperature

Surface-enhanced Raman spectroscopy for in vivo biosensing

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