Assembly of gold nanostructured films templated by colloidal crystals and use in surface-enhanced Raman spectroscopy

Tessier, Peter M.; Ong, Kate K.; Christesen, Steven D.; Lenhoff, Abraham M.; Kaler, Eric W.; Velev, Orlin D.

doi:10.1117/12.455751

Cited by 32 publications

(40 citation statements)

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“…Among the various nanoparticles, metal nanoparticles assume special importance because they are easier and cheaper to synthesize and possess promising applications (Juan et al 2012). Additionally, metal nanoparticles display a surface plasmon resonance (SPR) absorption in the UV-Vis region which arises from the coherent existence of free electrons in the conduction band due to the small particle size (Burda et al 2005;Tessier et al 2000). The band shift is dependent on the particle size, chemical surrounding, adsorbed species on the surface and dielectric constant (Mulvaney 1996).…”

Section: Introductionmentioning

confidence: 99%

Microwave-assisted green synthesis of silver nanoparticles from Fraxinus excelsior leaf extract and its antioxidant assay

et al. 2015

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The biosynthesis of nanoparticles has been proposed as a cost effective and environmentally benevolent alternative to chemical and physical methods. In the present study, microwave assisted synthesis of silver nanoparticles (AgNPs) has been demonstrated using leaf extract of Fraxinus excelsior reducing aqueous AgNO 3 solution. The synthesized nanoparticles have been characterized on the basis of fourier transform infrared spectroscopy (FT-IR), UV-Vis spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive X-ray (EDX) analysis. The presence of a characteristic surface plasmon resonance (SPR) absorption band at 425 nm in UV-Vis reveals the reduction of silver metal ions into silver nanoparticles. FT-IR analysis was carried out to probe the possible functional group involved in the synthesis of AgNPs. Further leaf extracts and AgNPs were evaluated for antiradical scavenging activity by 1,1-diphenyl-2-picryl-hydrazyl (DPPH) assay.

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Section: Introductionmentioning

confidence: 99%

Microwave-assisted green synthesis of silver nanoparticles from Fraxinus excelsior leaf extract and its antioxidant assay

et al. 2015

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“…This has motivated an upsurge in research on the synthesis routes that allow better control of shape and size (18,34,41), with projected applications in nanoelectronics and spectroscopy (14,19,36).…”

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confidence: 99%

Does the Antibacterial Activity of Silver Nanoparticles Depend on the Shape of the Nanoparticle? A Study of the Gram-Negative Bacterium Escherichia coli

Pal

Tak

Song

2007

Appl Environ Microbiol

3,700

103

2,192

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In this work we investigated the antibacterial properties of differently shaped silver nanoparticles against the gram-negative bacterium Escherichia coli, both in liquid systems and on agar plates. Energy-filtering transmission electron microscopy images revealed considerable changes in the cell membranes upon treatment, resulting in cell death. Truncated triangular silver nanoplates with a {111} lattice plane as the basal plane displayed the strongest biocidal action, compared with spherical and rod-shaped nanoparticles and with Ag ؉ (in the form of AgNO 3 ). It is proposed that nanoscale size and the presence of a {111} plane combine to promote this biocidal property. To our knowledge, this is the first comparative study on the bactericidal properties of silver nanoparticles of different shapes, and our results demonstrate that silver nanoparticles undergo a shape-dependent interaction with the gram-negative organism E. coli.Over the past few decades, inorganic nanoparticles, whose structures exhibit significantly novel and improved physical, chemical, and biological properties, phenomena, and functionality due to their nanoscale size, have elicited much interest. Nanophasic and nanostructured materials are attracting a great deal of attention because of their potential for achieving specific processes and selectivity, especially in biological and pharmaceutical applications (5, 39).Discoveries in the past decade have demonstrated that the electromagnetic, optical, and catalytic properties of noble-metal nanocrystals are strongly influenced by shape and size (6,26). This has motivated an upsurge in research on the synthesis routes that allow better control of shape and size (18,34,41), with projected applications in nanoelectronics and spectroscopy (14,19,36).Recent studies have demonstrated that specially formulated metal oxide nanoparticles have good antibacterial activity (33), and antimicrobial formulations comprising nanoparticles could be effective bactericidal materials (11,12).Among inorganic antibacterial agents, silver has been employed most extensively since ancient times to fight infections and control spoilage. The antibacterial and antiviral actions of silver, silver ion, and silver compounds have been thoroughly investigated (28,29,37). However, in minute concentrations, silver is nontoxic to human cells. The epidemiological history of silver has established its nontoxicity in normal use. Catalytic oxidation by metallic silver and reaction with dissolved monovalent silver ion probably contribute to its bactericidal effect (17). Microbes are unlikely to develop resistance against silver, as they do against conventional and narrow-target antibiotics, because the metal attacks a broad range of targets in the organisms, which means that they would have to develop a host of mutations simultaneously to protect themselves. Thus, silver ions have been used as an antibacterial component in dental resin composites (15), in synthetic zeolites (22), and in coatings of medical devices (2).Recent literature r...

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“…Also templating of liquid metal by a pore forming agent is possible (see Figure 2c). [31][32][33][34] Pore forming agents can be solids, gasses, or gas releasing compounds. Metal fibers might also be woven into a fabric, that is, later sintered to form a porous layer.…”

Section: Metalsmentioning

confidence: 99%

Porous Polymer Membranes by Hard Templating – A Review

2017

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Membranes are designed to bridge a precise separation process at the nanoscale with industrial applications running at cubic meters per hour. This review outlines materials applied in membrane production with a particular focus on polymers. Membrane performance and created value are directly linked to controlled pore formation. Their economic relevance has created a number of large companies and associated academic research at top institutions. The authors review, therefore, starts from well-established techniques applied in products and then moves on to evolving concepts from academia. Pore formation through hard templating is a versatile field for separation processes. A more detailed view is given on the two known concepts for nanopore formation, namely colloidal templates and random hard salt templating. A comparison between these two concepts underlines their relevance to combine a process specific separation with large scale manufacturing requirements (i.e., upscale possibility, flexible process control and environmental impact).

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Assembly of gold nanostructured films templated by colloidal crystals and use in surface-enhanced Raman spectroscopy

Cited by 32 publications

References 0 publications

Microwave-assisted green synthesis of silver nanoparticles from Fraxinus excelsior leaf extract and its antioxidant assay

Microwave-assisted green synthesis of silver nanoparticles from Fraxinus excelsior leaf extract and its antioxidant assay

Does the Antibacterial Activity of Silver Nanoparticles Depend on the Shape of the Nanoparticle? A Study of the Gram-Negative Bacterium Escherichia coli

Porous Polymer Membranes by Hard Templating – A Review

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