High‐Throughput Synthesis of Uniform Silver Seed Particles by a Continuous Microfluidic Synthesis Platform

Thiele, Maik; Knauer, Andrea; Csáki, Andrea; Mallsch, Daniell; Henkel, Thomas; Köhler, J. Michael; Fritzsche, Wolfgang

doi:10.1002/ceat.201400524

Cited by 21 publications

(13 citation statements)

References 27 publications

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“…In this curve, the LSPR peak can be found at 532.5 nm, demonstrating the formation of spherical particles with a diameter of more than 2 nm [ 42 , 43 ]. Seeds smaller than 2 nm in diameter do not show the LSPR band in the UV–VIS spectrum and are preferable for the synthesis, while the use of larger seeds may affect the synthesis efficiency [ 44 , 45 , 46 , 47 , 48 , 49 ]. Therefore, the pronounced LSPR peak represents an indicator of an undesired seed overgrowth, and the next stage of the synthesis should be carried out before it occurs.…”

Section: Resultsmentioning

confidence: 99%

Time Optimization of Seed-Mediated Gold Nanotriangle Synthesis Based on Kinetic Studies

2021

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The synthesis of shape-anisotropic plasmonic nanoparticles such as gold nanotriangles is of increasing interest. These particles have a high potential for applications due to their notable optical properties. A key challenge of the synthesis is usually the low reproducibility. Even the optimized seed-based methods often lack in the synthesis yield or are labor- and time-consuming. In this work, a seed-mediated synthesis with high reproducibility is replicated in order to determine the necessary reaction time for each step. Online monitoring of the reaction mixtures by UV–VIS spectroscopy is used as a powerful tool to track the evolution of the synthesis. The kinetics of the individual stages is elucidated by real-time investigations. As a consequence, the complete synthesis could be optimized and can now be realized in a single day instead of three without any loss in the resulting sample quality.

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Section: Resultsmentioning

confidence: 99%

Time Optimization of Seed-Mediated Gold Nanotriangle Synthesis Based on Kinetic Studies

2021

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“…Silver nanoparticles were synthesized through a single-flow tubular type microreactor by using silver pentafluoropropionate as a precursor ( Figure 5 a) [ 47 ]. Similarly, anisotropic silver nanoparticles were prepared by the reduction of silver nitrate with NaBH 4 in a microfluidic reactor, consisting of three different types of micromixers [ 48 ]. Moreover, Guo and coworkers constructed a microfluidic platform for the continuous-flow chemoselective polymerization, to synthesize polyester-modified silver nanoparticles ( Figure 5 b) [ 116 ].…”

Section: Progress Of Microfluidic Technology In the Synthesis Of Imentioning

confidence: 99%

Synthesis and Surface Engineering of Inorganic Nanomaterials Based on Microfluidic Technology

Shen

Shafiq

et al. 2020

Nanomaterials

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The controlled synthesis and surface engineering of inorganic nanomaterials hold great promise for the design of functional nanoparticles for a variety of applications, such as drug delivery, bioimaging, biosensing, and catalysis. However, owing to the inadequate and unstable mass/heat transfer, conventional bulk synthesis methods often result in the poor uniformity of nanoparticles, in terms of microstructure, morphology, and physicochemical properties. Microfluidic technologies with advantageous features, such as precise fluid control and rapid microscale mixing, have gathered the widespread attention of the research community for the fabrication and engineering of nanomaterials, which effectively overcome the aforementioned shortcomings of conventional bench methods. This review summarizes the latest research progress in the microfluidic fabrication of different types of inorganic nanomaterials, including silica, metal, metal oxides, metal organic frameworks, and quantum dots. In addition, the surface modification strategies of nonporous and porous inorganic nanoparticles based on microfluidic method are also introduced. We also provide the readers with an insight on the red blocks and prospects of microfluidic approaches, for designing the next generation of inorganic nanomaterials.

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“…The synthesis of these particles is possible through different approaches either as monometallic or bimetallic nanoparticles. The typically utilized bottom-up technique including metal salts and different reducing agents involves classical [14][15][16][17][18][19][20] or microfluidic [21][22][23][24][25] wet-chemical synthesis approaches, or preparation through ball milling [26][27][28][29]. Furthermore, gold nanoparticles in particular can be synthesized in different shapes, such as spheres [14,[16][17][18], cubes [30], rods [31,32], prisms [33,34] or stars [35].…”

Section: Introductionmentioning

confidence: 99%

Shape-Dependent Catalytic Activity of Gold and Bimetallic Nanoparticles in the Reduction of Methylene Blue by Sodium Borohydride

et al. 2021

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In this study the catalytic activity of different gold and bimetallic nanoparticle solutions towards the reduction of methylene blue by sodium borohydride as a model reaction is investigated. By utilizing differently shaped gold nanoparticles, i.e., spheres, cubes, prisms and rods as well as bimetallic gold–palladium and gold–platinum core-shell nanorods, we evaluate the effect of the catalyst surface area as available gold surface area, the shape of the nanoparticles and the impact of added secondary metals in case of bimetallic nanorods. We track the reaction by UV/Vis measurements in the range of 190–850 nm every 60 s. It is assumed that the gold nanoparticles do not only act as a unit transferring electrons from sodium borohydride towards methylene blue but can promote the electron transfer upon plasmonic excitation. By testing different particle shapes, we could indeed demonstrate an effect of the particle shape by excluding the impact of surface area and/or surface ligands. All nanoparticle solutions showed a higher methylene blue turnover than their reference, whereby gold nanoprisms exhibited 100% turnover as no further methylene blue absorption peak was detected. The reaction rate constant k was also determined and revealed overall quicker reactions when gold or bimetallic nanoparticles were added as a catalyst, and again these were highest for nanoprisms. Furthermore, when comparing gold and bimetallic nanorods, it could be shown that through the addition of the catalytically active second metal platinum or palladium, the dye turnover was accelerated and degradation rate constants were higher compared to those of pure gold nanorods. The results explore the catalytic activity of nanoparticles, and assist in exploring further catalytic applications.

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High‐Throughput Synthesis of Uniform Silver Seed Particles by a Continuous Microfluidic Synthesis Platform

Cited by 21 publications

References 27 publications

Time Optimization of Seed-Mediated Gold Nanotriangle Synthesis Based on Kinetic Studies

Time Optimization of Seed-Mediated Gold Nanotriangle Synthesis Based on Kinetic Studies

Synthesis and Surface Engineering of Inorganic Nanomaterials Based on Microfluidic Technology

Shape-Dependent Catalytic Activity of Gold and Bimetallic Nanoparticles in the Reduction of Methylene Blue by Sodium Borohydride

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