Direct Cross-Linking of Au/Ag Alloy Nanoparticles into Monolithic Aerogels for Application in Surface-Enhanced Raman Scattering

Gao, Xiaonan; Esteves, Richard J Alan; Nahar, Lamia; Nowaczyk, Jordan; Arachchige, Indika U.

doi:10.1021/acsami.5b11582

Cited by 44 publications

(55 citation statements)

References 69 publications

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“…[103] Pure Ag nanoshells could be assembled into opaque and transparent gels by first concentrating the colloid followed by the oxidation of the surface ligands.T he etching of the nanoshells into significantly smaller nanoparticles is responsible for the formation of the transparent gels. [105] A20-fold increase in SERS intensity was achieved in the final gels compared to the initial nanoparticles. [105] A20-fold increase in SERS intensity was achieved in the final gels compared to the initial nanoparticles.…”

Section: Galvanic Replacement As Asynthesis Toolmentioning

confidence: 90%

“…[102][103][104][105] Thei nitial nanoshells are produced via ag alvanic replacement reaction of pre-formed Ag and Ni nanoparticles,respectively.Au/Ag, Pd/ Ag, and Pt/Ag alloyed nanoshells were first concentrated by either simple solvent evaporation or with the help of centrifuge membrane filters.Colloidal solutions concentrated through solvent evaporation spontaneously formed ag el when stored in the dark for several days,w hereas the nanoshell solution concentrated with centrifuge filters could be destabilized by the addition of NaCl. [102][103][104][105] Thei nitial nanoshells are produced via ag alvanic replacement reaction of pre-formed Ag and Ni nanoparticles,respectively.Au/Ag, Pd/ Ag, and Pt/Ag alloyed nanoshells were first concentrated by either simple solvent evaporation or with the help of centrifuge membrane filters.Colloidal solutions concentrated through solvent evaporation spontaneously formed ag el when stored in the dark for several days,w hereas the nanoshell solution concentrated with centrifuge filters could be destabilized by the addition of NaCl.…”

Section: Galvanic Replacement As Asynthesis Toolmentioning

confidence: 99%

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Modern Inorganic Aerogels

et al. 2017

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Essentially, the term aerogel describes a special geometric structure of matter. It is neither limited to any material nor to any synthesis procedure. Hence, the possible variety of materials and therefore the multitude of their applications are almost unbounded. In fact, the same applies for nanoparticles. These are also just defined by their geometrical properties. In the past few decades nano-sized materials have been intensively studied and possible applications appeared in nearly all areas of natural sciences. To date a large variety of metal, semiconductor, oxide, and other nanoparticles are available from colloidal synthesis. However, for many applications of these materials an assembly into macroscopic structures is needed. Here we present a comprehensive picture of the developments that enabled the fusion of the colloidal nanoparticle and the aerogel world. This became possible by the controlled destabilization of pre-formed nanoparticles, which leads to their assembly into three-dimensional macroscopic networks. This revolutionary approach makes it possible to use precisely controlled nanoparticles as building blocks for macroscopic porous structures with programmable properties.

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Section: Galvanic Replacement As Asynthesis Toolmentioning

confidence: 90%

Section: Galvanic Replacement As Asynthesis Toolmentioning

confidence: 99%

Modern Inorganic Aerogels

et al. 2017

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“…Impressively, an ultrahigh specific surface area of up to 160 m 2 g −1 was obtained for the resulting Ag–nanoshell‐based aerogels, outperforming the SSAs of most NMFs. Several following studies further expanded the system to Au–Ag and Au–Ag–Pd aerogels . By engineering the composition of ternary Au–Ag–Pd alloy NPs by the stepwise galvanic replacement reaction (GRR) of l ‐glutathione‐stabilized Ag NPs, Nahar et al observed that spherical and anisotropic NPs were obtained with higher and lower Pd proportion, respectively, further resulting in gels with different microstructures.…”

Section: Fabrication Strategiesmentioning

confidence: 99%

Engineering Self‐Supported Noble Metal Foams Toward Electrocatalysis and Beyond

Hübner

et al. 2019

Advanced Energy Materials

106

105

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Noble metals, despite their expensiveness, display irreplaceable roles in widespread fields. To acquire novel physicochemical properties and boost the performance‐to‐price ratio for practical applications, one core direction is to engineer noble metals into nanostructured porous networks. Noble metal foams (NMFs), featuring self‐supported, 3D interconnected networks structured from noble‐metal‐based building blocks, have drawn tremendous attention in the last two decades. Inheriting structural traits of foams and physicochemical properties of noble metals, NMFs showcase a variety of interesting properties and impressive prospect in diverse fields, including electrocatalysis, heterogeneous catalysis, surface‐enhanced Raman scattering, sensing and actuation, etc. A number of NMFs have been created and versatile synthetic approaches have been developed. However, because of the innate limitation of specific methods and the insufficient understanding of formation mechanisms, flexible manipulation of compositions, structures, and corresponding properties of NMFs are still challenging. Thus, the correlations between composition/structure and properties are seldom established, retarding material design/optimization for specific applications. This review is devoted to a comprehensive introduction of NMFs ranging from synthesis to applications, with an emphasis on electrocatalysis. Challenges and opportunities are also included to guide possible research directions in this field and promote the interest of interdisciplinary scientists.

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“…[102][103][104][105] Die ursprünglichen Nanoschalen werden mithilfe galvanischer Austauschreaktion aus Ag-oder Ni-Nanopartikeln hergestellt. [102][103][104][105] Die ursprünglichen Nanoschalen werden mithilfe galvanischer Austauschreaktion aus Ag-oder Ni-Nanopartikeln hergestellt.…”

Section: Galvanischer Austausch Als Synthesehilfsmittelunclassified

“…[105] Gegenüber den Ausgangsnanopartikeln wurde in den fertigen Gelen ein 20-facher Anstieg in der SERS-Intensitäterreicht. [105] Gegenüber den Ausgangsnanopartikeln wurde in den fertigen Gelen ein 20-facher Anstieg in der SERS-Intensitäterreicht.…”

Section: Angewandte Chemieunclassified

Moderne Anorganische Aerogele

et al. 2017

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Der Begriff Aerogel beschreibt im Wesentlichen eine besondere geometrische Struktur der Materie, die materialunabhängig ist und keinem speziellen Syntheseverfahren unterliegt. Grundsätzlich können daher Aerogele aus unzähligen Materialien bestehen, wodurch die Anwendungsmöglichkeiten nahezu unbegrenzt sind. Dasselbe trifft auf Nanopartikel zu. Diese werden ebenso durch ihre geometrischen Eigenschaften definiert. In den letzten Jahrzehnten standen daher nanoskalige Materialien im Fokus der Forschung, und es entwickelten sich mögliche Anwendungen in vielen naturwissenschaftlichen Bereichen. Heute ist eine Vielzahl an Metall‐, Halbleiter‐, Oxid‐ und anderen Nanopartikeln durch kolloidale Synthesen zugänglich. Dennoch ist es für eine Anwendung oft notwendig, dass diese Materialien zuvor in makroskopische Strukturen angeordnet werden. Dieser Aufsatz gibt eine ausführliche Übersicht über die Entwicklung, die die Welt der kolloidalen Nanopartikel und der Aerogele miteinander vereint. Ermöglicht wurde dies durch die kontrollierte Destabilisierung der vorab gebildeten Nanopartikel, die zu einer Anordnung der Nanopartikel zu einem dreidimensionalen, makroskopischen Netzwerk führt. Dieses revolutionäre Konzept verleiht die Möglichkeit, präzise kontrollierte Nanopartikel als Grundbausteine für makroskopische, poröse Strukturen mit einstellbaren Eigenschaften zu nutzen.

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Direct Cross-Linking of Au/Ag Alloy Nanoparticles into Monolithic Aerogels for Application in Surface-Enhanced Raman Scattering

Cited by 44 publications

References 69 publications

Modern Inorganic Aerogels

Modern Inorganic Aerogels

Engineering Self‐Supported Noble Metal Foams Toward Electrocatalysis and Beyond

Moderne Anorganische Aerogele

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