Evaporative Self‐Assembly of Gold Nanorods into Macroscopic 3D Plasmonic Superlattice Arrays

Li, Penghui; Li, Yong; Zhou, Zhang‐Kai; Tang, Shuihua; Yu, Xue‐Feng; Xiao, Shuhu; Wu, Zhi-Xi; Xiao, Qiang; Zhao, Yuetao; Wang, Huaiyu; Chu, Paul K.

doi:10.1002/adma.201505617

Cited by 175 publications

(163 citation statements)

References 51 publications

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“…changed the capping ligand CTAB with negatively charged surfactants to optimize the assembly process for improved GNR arrays. [34] After the exchange,t he z-potential of the GNRs is lowered to about À15.0 mV.I nt his work, they found that not only the orientation of the GNRs assemblies but also the geometry of the arrays can be controlled by regulating GNR surface chemistry,s urfactants,a nd the substrates.I nterestingly,p artially functionalized GNRs can assemble into vertically array with alterative symmetry.Arecent report shows that by introducing Rhodamine 6G to the CTAB bilayer,t etragonal GNR arrays instead of traditional hexagonal arrays have been formed. [35] Finally,amicropatterned substrate was used for directing the GNR self-assembly to form exclusively vertical arrays (Figure 3).…”

Section: Methodsmentioning

confidence: 98%

Oriented Gold Nanorod Arrays: Self‐Assembly and Optoelectronic Applications

2019

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Self‐assembly of anisotropic plasmonic nanomaterials into ordered superstructures has become popular in nanoscience because of their unique anisotropic optical and electronic properties. Gold nanorods (GNRs) are a well‐defined functional building block for fabrication of these superstructures. They possess important anisotropic plasmonic characteristics that result from strong local electric field and are responsive to visible and near‐IR light. There are recent examples of assembling the GNRs into ordered arrays or superstructures through processes such as solvent evaporation and interfacial assembly. In this Minireview, recent progress in the development of the self‐assembled GNR arrays is described, with focus on the formation of oriented GNR arrays on substrates. Key driving forces are discussed, and different strategies and self‐assembly processes of forming oriented GNR arrays are presented. The applications of the oriented GNR arrays in optoelectronic devices are also overviewed, especially surface enhanced Raman scattering (SERS).

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Section: Methodsmentioning

confidence: 98%

Oriented Gold Nanorod Arrays: Self‐Assembly and Optoelectronic Applications

2019

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“…But for practical SERS detection, colloidal nanoparticles synthesized by LAL can still be challenges for producing large and stable enhancement of Raman signals, due to the discrete and random distribution of hot spots. [1c] Self‐assembly of metallic nanoparticles arrays onto a substrate are usually executed,[4e,14] whereas the poor adhesive forces to substrates might restrict their practical applications. Recently, incorporating plasmonic structures onto solid substrates by lasers have been intensively studied for applications on reproducible biochemical analysis and diagnostics due to their on‐demand fabrication features, which possess huge potential in practical applications.…”

Section: Introductionmentioning

confidence: 99%

Femtosecond Photon‐Mediated Plasma Enhances Photosynthesis of Plasmonic Nanostructures and Their SERS Applications

Peng

Jiang

et al. 2019

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LSPR), have attracted numerous interests in the fields of plasmon-enhanced spectroscopies, [1] imaging, [2] chemical transformations, [3] and solar energy conversion. [3c,d] Notably, the enhancedelectromagnetic field ("hot spots") near plasmonic surfaces because of strong plasmon resonance coupling fully benefits to magnify the cross-section of surface-enhanced Raman spectroscopy (SERS) [1b,c,4] and extended applications. [5] During these years, cited methods for synthesizing plasmonic nanostructures, such as chemical synthesis, [6] photoreduction, [7] and electron beam lithography, [4d,8] have been developed to facilitate their applications. Whereas the residual photoinitiators and reducing agents on plasmonic surfaces are always unexpected in biomedical analysis and redox reaction proceeding. To this end, the exploration of high tunable and surfactant-free approaches in fabricating SERS-active nanostructures is still highly in demand.In recent two decades, laser ablation in liquid (LAL) has been intensively studied as a green, simple, and versatile method to synthesize functional nanomaterials with various compositions and morphologies. [9] Generally, two categories are typically adopted to synthesize plasmonic nanostructures: chemical bottom-up and physical top-down. [9c] Photochemical reduction of metal precursors features bottom-up approach to synthesize colloidal nanoparticles. [7a,b,9d,10] By photolyzing the metal complexes, [11] or by using the photosensitive regents or photochemically generated intermediates (e.g., hydrated electrons and radicals from water radiolysis), [7a,10] metal cations could be photoreduced to neutral atoms or clusters. The top-down method mainly depends on laser ablation of bulk into nanoparticle dispersions. [12] The main mechanisms are based on converting the laser energy into material plasma or vapor phases, and micro/nano droplets. And they subsequently quench and react with the surrounding mediums to form colloidal nanostructures. [9b,c,12b,13] From this technique, numerous newfangled nanostructures with excellent plasmonic properties have been successfully synthesized with LAL technique by selecting the appropriate solvents, ligands, and laser parameters, which exhibit huge potential in plasmonic science and technologies. [9a-d] Laser ablation in liquid has proven to be a universal and green method to synthesize nanocrystals and fabricate functional nanostructures. This study demonstrates the superiority of femtosecond laser-mediated plasma in enhancing photoredox of metal cations for controllable fabrication of plasmonic nanostructures in liquid. Through employing upstream high energetic plasma during laser-induced microexplosions, single/three-electron photoreduction of metallic cations can readily occur without chemical reductants or capping agents. Experimental evidences demonstrate that this process exhibits higher photon utilization efficiency in yield of colloidal metal nanoparticles than direct irradiation of metallic precursors. Photogenerated hydr...

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“…Until now, numerous detection methods based on fluorescence, atomic absorption spectroscopy, biosensor, colorimetric, and resonance scattering have been developed for the detection of Hg 2+ . However, compared to these methods, surface‐enhanced Raman scattering (SERS) with its extremely high surface sensitivity and fingerprint information about the chemical structures has attracted increasing attention in various areas, including food safety, biology, biomedical diagnostics, and chemistry . Therefore, detecting traces of Hg 2+ ions through SERS has received the welcome of people.…”

Section: Introductionmentioning

confidence: 99%

Ultrasensitive SERS Substrate Integrated with Uniform Subnanometer Scale “Hot Spots” Created by a Graphene Spacer for the Detection of Mercury Ions

Zhang

Dai

et al. 2016

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Mercuric ion (Hg2+) is one of the most toxic and serious environment polluting heavy metal ions, which can be accumulated in human body through food chains and drinking water, and causes serious damage to human organs. Therefore, development of the efficient and sensitive method for detection of Hg2+ is very necessary. In this study, the high surface sensitivity and fingerprint information about the chemical structures based on surface‐enhanced Raman scattering (SERS) for sensing applications are taken advantage of. Au triangular nanoarrays/n‐layer graphene/Au nanoparticles sandwich structure with large‐area uniform subnanometer gaps are fabricated and used to detect Hg2+ in water via thymine–Hg2+–thymine coordination; the detection limit of Hg2+ is as low as 8.3 × 10−9m. Moreover, this SERS substrate is used to detect the Hg2+‐contaminated sandy soil and shows excellent performance. This study indicates the sandwich structure has a great potential in detection of toxic metal ions and environmental pollutants.

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Evaporative Self‐Assembly of Gold Nanorods into Macroscopic 3D Plasmonic Superlattice Arrays

Cited by 175 publications

References 51 publications

Oriented Gold Nanorod Arrays: Self‐Assembly and Optoelectronic Applications

Oriented Gold Nanorod Arrays: Self‐Assembly and Optoelectronic Applications

Femtosecond Photon‐Mediated Plasma Enhances Photosynthesis of Plasmonic Nanostructures and Their SERS Applications

Ultrasensitive SERS Substrate Integrated with Uniform Subnanometer Scale “Hot Spots” Created by a Graphene Spacer for the Detection of Mercury Ions

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