Simultaneous Synthesis and Assembly of Silver Nanoparticles to Three-Demensional Superstructures for Sensitive Surface-Enhanced Raman Spectroscopy Detection

Yang, Yanqiong; Wang, Wen-Qin; Chen, Tao; Chen, Zhong‐Ren

doi:10.1021/am506464f

Cited by 20 publications

(24 citation statements)

References 43 publications

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“…were fabricated and tested as versatile SERS substrates [12][13][14][15][16][17][18][19][20][21][22][23] . Specifically, porous materials, nanostructures and nanoparticles, routinely reaching uniform SERS enhancement sufficient to overcome single-molecule detection limit independently on excitation/detection conditions, are of growing interest [24][25][26] .…”

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confidence: 99%

Fabrication of porous microrings via laser printing and ion-beam post-etching

Syubaev

Nepomnyashchiy

Mitsai

et al. 2017

Applied Physics Letters

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Pulsed-laser dry printing of noble-metal microrings with a tunable internal porous structure, which can be revealed via an ion-beam etching post-procedure, was demonstrated. Abundance and average size of the pores inside the microrings were shown to be tuned in a wide range by varying incident pulse energy and a nitrogen doping level controlled in the process of magnetron deposition of the gold film in the appropriate gaseous environment. The fabricated porous microrings were shown to provide many-fold near-field enhancement of incident electromagnetic fields, which was confirmed by mapping of the characteristic Raman band of a nanometer-thick covering layer of Rhodamine 6G dye molecules and supporting finite-difference time-domain calculations. The proposed laserprinting/ion-beam etching approach is demonstrated to be a unique tool aimed at designing and fabricating multifunctional plasmonic structures and metasurfaces for spectroscopic bioidentification based on surface-enhanced infrared absorption, Raman scattering and photoluminescence detection schemes.Surface-enhanced Raman scattering (SERS) is an ultra-sensitive non-invasive spectroscopic technique based on a label-free identification of different molecules placed in the vicinity of plasmonic-active nanostructured metallic substrates 1-4 . Intensity of the characteristic Raman signal defining the specific vibrational signatures of individual molecules is usually very weak. However, this signal can be significantly increased near nanotextured surfaces or nanostructures generating localized, strongly enhanced plasmon-mediated electromagnetic fields. Since the first observation of SERS signal from single molecule 5 , multiple attempts were undertaken to increase the efficiency of SERS-active nanotextured substrates in terms of achieved maximal enhancement factor inside a single "hot spot" as well as number (density) of "hot spots" per individual nanostructure 6-11 .To address both issues, variety of nanotextured structures, predominantly having large surface-to-volume ratio and generating dense hot spots (tipped structures, nanostructures with inner porosity, intra-gap structures or self-assembly superstructures, etc.) were fabricated and tested as versatile SERS substrates 12-23 . Specifically, porous materials, nanostructures and nanoparticles, routinely reaching uniform SERS enhancement sufficient to overcome single-molecule detection limit independently on excitation/detection conditions, are of growing interest [24][25][26] . Several papers reported fabrication of such sponge-like structures, using dealloying of the two-component template via its dissolving in a corrosive environment 27,28 . Meanwhile, to design sensitive elements for advanced biosensors, along with desirable porosity, it is also important to control the overall size and shape of such porous templates as well as to arrange them into well-ordered arrays at specific point on a substrate with micrometer-scale lateral accuracy. Despite the latter issue can be resolved by using well-establis...

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mentioning

confidence: 99%

Fabrication of porous microrings via laser printing and ion-beam post-etching

Syubaev

Nepomnyashchiy

Mitsai

et al. 2017

Applied Physics Letters

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“…From the scanning‐electron microscopy (SEM) images, we observe that mostly trigonal supracrystals have been built up (Figure a–c). These structures have already been presented in numerous publications . By SAXS, HRSEM, and TEM measurements, we can confirm that these supracrystals are built up from an assembly of the NPs into fcc superlattices with lattice parameters of about 10.4 nm.…”

Section: Resultsmentioning

confidence: 85%

The Formation and Morphology of Nanoparticle Supracrystals

Haubold

Reichhelm

Weiz

et al. 2016

Adv Funct Materials

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Much effort has been put into the characterization of the final superstructures and the investigation of the NP assembly by many groups. We know from these studies that the particles can arrange into fcc, bcc, or hcp superlattices showing a long-range ordering of the primary building units. [8] These supracrystals show a high symmetry and well-defined facets yielding octahedra, [7] hexagonal plates, [6] five-armed stars, [9] and more complex twinned structures. [10] Furthermore, there are a lot of investigations dealing with the self-assembly of nanoparticles and the corresponding mechanism. Different models have been developed ranging from a hard sphere model, [11,12] where the NPs are assumed to be spherical objects of similar size, to soft sphere models, where the kind of ligand determines the self-assembly. [13,14] Also the driving force and the assembly probability on steps, holes, or edges have been calculated. [15] Nevertheless, the formation process itself, which takes place in solution, has yet to be fully understood.In this study, we achieved insight into the formation process in solution by investigating the morphology of the resulting supracrystals. Due to the large variety of reported morphologies, we decided to examine one of the most frequently observed symmetrical crystal shapes, which will be called trigonal supracrystal (see Figure 1) in the following. Additionally, we surveyed the influences of different preparation parameters on the resulting superstructures.Trigonal Ag supracrystals have been prepared via gas-phase destabilization techniques (details can be found in the Supporting Information). On the basis of high-resolution scanning electron microscopy (HRSEM), small angle X-ray scattering (SAXS), and transmission electron microscopy (TEM) measurements, the concept of substrate-affected growth is introduced to explain the formation of trigonal shaped supracrystals yielding the size of the supracrystals, which are formed in solution. We will show that the self-assembly can be influenced by the preparation parameters such as concentration, temperature, NP size, and size distribution leading to a control of the size of the supracrystals formed in solution. In order to evaluate the concept of substrate-affected growth, the investigations have been extended toward Au.From the literature, we can conclude that trigonal supracrystals occurred, if there is on the one hand a fcc arrangement of the NPs and on the other hand a plane (substrate) surface. The Formation and Morphology of Nanoparticle SupracrystalsDanny Haubold, Annett Reichhelm, Alexander Weiz, Lars Borchardt, Christoph Ziegler, Lydia Bahrig, Stefan Kaskel, Michael Ruck, and Alexander Eychmüller* Supracrystals are highly symmetrical ordered superstructures built up from nanoparticles (NPs) via self-assembly. While the NP assembly has been intensively investigated, the formation mechanism is still not understood. To shed some light onto the formation mechanism, one of the most common supracrystal morphologies, the trigonal structures, ...

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“…[13] Besides these merits, it has been demonstrated that polymer brushes can act as capping agents to control the growth of noble-metalp articles. [14] Although,in our previousr eports,h ierarchical noble-metal particles could be obtained on the surfaceo ft he polymer brushesgrafted-GO films, the noble-metal structures are highly dependent on the choice of the external reducinga gent. [15,16] To date,c ontrolled growth of 3D noble-metalp articles by as pontaneous redox reactionb etween graphene with grafted polymer brushes and metal salts withoutt he use of any additional reducing agent has rarely been reported.…”

Section: Introductionmentioning

confidence: 86%

Spontaneous Growth of 3D Silver Mesoflowers on Poly(4‐vinylpyridine) Brushes‐Grafted‐Graphene Oxide Films and Facile Creation of Nanoporosities over their Surface

Wang

et al. 2019

Chemistry A European J

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Fabricating three-dimensional (3D) hierarchical noble-metal particles by spontaneousr edox reactions between graphene and noble-metals alts still remains ag reat challenge. Herein, the fact that graphene oxide (GO) itself acts as both ap latformf or graftingp olymer brushes and a reducing agentt or educe [Ag(NH 3 ) 2 ] + ions is taken advantages of. 3D flower-like Ag mesoparticles (Agm esoflowers, Ag MFs) with tunable size and shapes can spontaneous grow on poly(4-vinylpyridine) brushes-grafted-graphene oxide (P4VP-g-GO) films in Ag(NH 3 ) 2 OH solution withoutt he use of any additional reducing agent.T he residual Ag(NH 3 ) 2 OH on 3D Ag MFs surface can be further reduced by NaBH 4 ,c ausing abundantn anoporosities over the entire Ag MFs. The resulting Ag nanoporous MFs (Ag NMFs) with largers urface-to-volume ratio and highern anoscale roughness exhibit ultrasensitivity in surface-enhanced Ramanspectroscopy( SERS) detection, and the detection limit for 4-aminothiophenoli sa sl ow as 10 À13 m.

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Simultaneous Synthesis and Assembly of Silver Nanoparticles to Three-Demensional Superstructures for Sensitive Surface-Enhanced Raman Spectroscopy Detection

Cited by 20 publications

References 43 publications

Fabrication of porous microrings via laser printing and ion-beam post-etching

Fabrication of porous microrings via laser printing and ion-beam post-etching

The Formation and Morphology of Nanoparticle Supracrystals

Spontaneous Growth of 3D Silver Mesoflowers on Poly(4‐vinylpyridine) Brushes‐Grafted‐Graphene Oxide Films and Facile Creation of Nanoporosities over their Surface

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