Oriented Gold Nanorod Arrays: Self‐Assembly and Optoelectronic Applications

Wei, Wenbo; Bai, Feng; Fan, Hongyou

doi:10.1002/anie.201902620

Cited by 107 publications

(93 citation statements)

References 99 publications

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“…If the evaporation process is extremely rapid, the arrangement of active material may be kinetically affected and the final configuration may essentially freeze into a thermodynamically unfavored state. The feasibility of using solvent evaporation toward ordered and oriented structures has been well established in several anisotropic nanomaterials, for example, gold nanorods . Inspired by this concept, in this work, we used ultrathin VOPO 4 nanosheets (Figure S1, Supporting Information) as a model material to demonstrate a facile fabrication method to achieve orientation control in the evaporation process.…”

mentioning

confidence: 99%

Evaporation‐Induced Vertical Alignment Enabling Directional Ion Transport in a 2D‐Nanosheet‐Based Battery Electrode

Zhu

Zhang

et al. 2020

Advanced Materials

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2D nanosheets have been widely explored as electrode materials owing to their extraordinarily high electrochemical activity and fast solid‐state diffusion. However, the scalable electrode fabrication based on this type of material usually suffers from severe performance losses due to restricted ion‐transport kinetics in a large thickness. Here, a novel strategy based on evaporation‐induced assembly to enable directional ion transport via forming vertically aligned nanosheets is reported. The orientational ordering is achieved by a rapid evaporation of mixed solvents during the electrode fabrication process. Compared with conventional drop‐cast electrodes, which exhibit a random arrangement of the nanosheets and obvious decrease of rate performance with increasing thickness, the electrode based on the vertically aligned nanosheets is able to retain the original high rate capability even at high mass loadings and electrode thickness. Combined electrochemical and structural characterization reveals the electrode composed of orientation‐controlled nanosheets to possess lower charge‐transfer resistances, leading to more complete phase transformation in the active material.

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confidence: 99%

Evaporation‐Induced Vertical Alignment Enabling Directional Ion Transport in a 2D‐Nanosheet‐Based Battery Electrode

Zhu

Zhang

et al. 2020

Advanced Materials

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“…It is well known that the physical enhancement mechanism generally refers to the local electromagnetic‐field enhancement, in contrast to the SPR effect of noble metals. Since the electron density of the noble metal (Au, Ag) allows a strong SPR in the visible region of light, the Raman spectrum of the adsorbed molecules can be significantly enhanced . For semiconductor materials, the electron density of the conduction band (CB) is generally low, and therefore, the oscillation frequency is located in the infrared region.…”

Section: Enhancement Mechanism Of Semiconductor Nanomaterialsmentioning

confidence: 99%

“…Surface‐enhanced Raman scattering (SERS) is a molecular fingerprinting technology with high sensitivity and has been widely used in surface/interface science, spectroscopy, biochemical detection, and other fields . In general, noble‐metal nanomaterials can achieve an ultrahigh SERS enhancement factor (EF) up to 10 12 due to their surface plasmon resonance (SPR) in the visible region, which enables the ultrasensitive detection of single molecules . However, noble‐metal substrates do not show a selective recognition of target molecules, and furthermore, high cost and poor spectral stability severely limit their developments in practical applications …”

Section: Introductionmentioning

confidence: 99%

SERS Activity of Semiconductors: Crystalline and Amorphous Nanomaterials

2019

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Surface‐enhanced Raman scattering (SERS) spectroscopy on semiconductors has attracted increasing attention due to its high spectral reproducibility and unique selectively to target molecules. Recently, endeavors have been made in fabricating novel SERS‐active semiconductor substrates and exploring new enhancement mechanisms to improve the sensitivity of semiconductor substrates. This Minireview explains the enhancement mechanism of the semiconductor SERS effect in a brief tutorial and summarize recent developments of novel semiconductor substrates, in particular with regard to the remarkable SERS activity of amorphous semiconductor nanomaterials. Potential applications of semiconductor SERS are also a key issue of concern. We discuss a variety of promising applications of semiconductor SERS in the fields of in situ analytical chemistry, spectroelectrochemical analysis, biological sensing, and trace detection.

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“…Although the SERS enhancement within a 3D plasmonic supercrystal is mostly concentrated at its external surface, 34 the above mentioned propagation modes would require strategies toward plasmonic supercrystals which permit the diffusion of the selected analyte from the external medium into the superlattice. Hamon et al 11 proposed the simultaneous coating and infiltration of Au nanorod supercrystals with mesoporous silica, to enhance the stability of the supercrystal as well as improving molecular diffusion.…”

Section: Applicationsmentioning

confidence: 99%

Plasmonic Supercrystals

et al. 2019

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CONSPECTUS: For decades, plasmonic nanoparticles have been extensively studied due to their extraordinary properties, related to localized surface plasmon resonances. A milestone in the field has been the development of the so-called seedmediated growth method, a synthetic route that provided access to an extraordinary diversity of metal nanoparticles with tailored size, geometry and composition. Such a morphological control came along with an exquisite definition of the optical response of plasmonic nanoparticles, thereby increasing their prospects for implementation in various fields. The susceptibility of surface plasmons to respond to small changes in the surrounding medium or to perturb (enhance/quench) optical processes in nearby molecules, has been exploited for a wide range of applications, from biomedicine to energy harvesting. However, the possibilities offered by plasmonic nanoparticles can be expanded even further by their careful assembly into either disordered or ordered structures, in 2D and 3D. The assembly of plasmonic nanoparticles gives rise to coupling/hybridization effects, which are strongly dependent on interparticle spacing and orientation, generating extremely high electric fields (hot spots), confined at interparticle gaps. Thus, the use of plasmonic nanoparticle assemblies as optical sensors have led to improving the limits of detection for a wide variety of (bio)molecules and ions. Importantly, in the case of highly ordered plasmonic arrays, other novel and unique optical effects can be generated. Indeed, new functional materials have been developed via the assembly of nanoparticles into highly ordered architectures, ranging from thin films (2D) to colloidal crystals or supercrystals (3D). The progress in the design and fabrication of 3D supercrystals could pave the way toward next generation plasmonic sensors, photocatalysts, optomagnetic components, metamaterials, etc. In this Account, we summarize selected recent advancements in the field of highly ordered 3D plasmonic superlattices. We first analyze their fascinating optical properties, for various systems with increasing degrees of complexity, from an individual metal nanoparticle through particle clusters with low coordination numbers, to disordered self-assembled structures and finally to supercrystals. We then describe recent progress in the fabrication of 3D plasmonic supercrystals, focusing on specific strategies but without delving into the forces governing the self-assembly process. In the last section, we provide an overview of the potential applications of plasmonic supercrystals, with a particular emphasis on those related with surface-enhanced Raman scattering (SERS) sensing, followed by a brief highlight of the main conclusions and remaining challenges.

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Oriented Gold Nanorod Arrays: Self‐Assembly and Optoelectronic Applications

Cited by 107 publications

References 99 publications

Evaporation‐Induced Vertical Alignment Enabling Directional Ion Transport in a 2D‐Nanosheet‐Based Battery Electrode

Evaporation‐Induced Vertical Alignment Enabling Directional Ion Transport in a 2D‐Nanosheet‐Based Battery Electrode

SERS Activity of Semiconductors: Crystalline and Amorphous Nanomaterials

Plasmonic Supercrystals

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