scholarly journals Hollow Gold-Silver Nanoshells Coated with Ultrathin SiO2 Shells for Plasmon-Enhanced Photocatalytic Applications

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4967
Author(s):  
Pannaree Srinoi ◽  
Maria Marquez ◽  
Tai-Chou Lee ◽  
T. Lee
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Near Infrared ◽  
Sodium Silicate Solution ◽  
Silica Shell ◽  
Localized Surface Plasmon ◽  
Galvanic Replacement ◽  
Gold Silver ◽  
Silver Nanoshells ◽  
Photocatalytic Applications

This article details the preparation of hollow gold-silver nanoshells (GS-NSs) coated with tunably thin silica shells for use in plasmon-enhanced photocatalytic applications. Hollow GS-NSs were synthesized via the galvanic replacement of silver nanoparticles. The localized surface plasmon resonance (LSPR) peaks of the GS-NSs were tuned over the range of visible light to near-infrared (NIR) wavelengths by adjusting the ratio of silver nanoparticles to gold salt solution to obtain three distinct types of GS-NSs with LSPR peaks centered near 500, 700, and 900 nm. Varying concentrations of (3-aminopropyl)trimethoxysilane and sodium silicate solution afforded silica shell coatings of controllable thicknesses on the GS-NS cores. For each type of GS-NS, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images verified our ability to grow thin silica shells having three different thicknesses of silica shell (~2, ~10, and ~15 nm) on the GS-NS cores. Additionally, energy-dispersive X-ray (EDX) spectra confirmed the successful coating of the GS-NSs with SiO2 shells having controlled thicknesses. Extinction spectra of the as-prepared nanoparticles indicated that the silica shell has a minimal effect on the LSPR peak of the gold-silver nanoshells.

Electron microscopy and EXAFS studies on oxide-supported gold–silver nanoparticles prepared by flame spray pyrolysis

2006 ◽  
Vol 252 (22) ◽  
pp. 7862-7873 ◽  
Author(s):  
Stefan Hannemann ◽  
Jan-Dierk Grunwaldt ◽  
Frank Krumeich ◽  
Peter Kappen ◽  
Alfons Baiker
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Spray Pyrolysis ◽  
Flame Spray Pyrolysis ◽  
Flame Spray ◽  
Gold Silver ◽  
Supported Gold

Galvanic replacement synthesis of multi-branched gold nanocrystals for photothermal cancer therapy

2020 ◽  
Vol 8 (25) ◽  
pp. 5491-5499
Author(s):  
Dewei Zhu ◽  
Yang Liu ◽  
Maixian Liu ◽  
Xin Liu ◽  
Paras N. Prasad ◽  
...  
Keyword(s):  
Near Infrared ◽  
Short Wave ◽  
Localized Surface Plasmon ◽  
Galvanic Replacement ◽  
Gold Nanocrystals ◽  
Photothermal Heating ◽  
Cervical Cancer Cells ◽  
Infrared Wavelengths ◽  
Human Cervical Cancer Cells ◽  
Human Cervical Cancer

Au nanostars with tunable arm length and broad tunable localized surface plasmon resonance absorbance across near-infrared to short-wave infrared wavelengths effectively ablate human cervical cancer cells through photothermal heating.

Ultrasmall Hollow Gold–Silver Nanoshells with Extinctions Strongly Red-Shifted to the Near-Infrared

2011 ◽  
Vol 3 (9) ◽  
pp. 3616-3624 ◽  
Author(s):  
Varadee Vongsavat ◽  
Brandon M. Vittur ◽  
William W. Bryan ◽  
Jun-Hyun Kim ◽  
T. Randall Lee
Keyword(s):  
Near Infrared ◽  
Gold Silver ◽  
Silver Nanoshells

scholarly journals In situ liquid-cell electron microscopy of silver–palladium galvanic replacement reactions on silver nanoparticles

2014 ◽  
Vol 5 (1) ◽  
Author(s):  
E. Sutter ◽  
K. Jungjohann ◽  
S. Bliznakov ◽  
A. Courty ◽  
E. Maisonhaute ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Galvanic Replacement ◽  
Liquid Cell ◽  
Silver Palladium

Effect of the Organic Functionality on the Synthesis and Antimicrobial Activity of Silver Nanoparticles

Nano LIFE ◽  
2020 ◽  
Vol 10 (03) ◽  
pp. 2050002 ◽  
Author(s):  
P. C. Pandey ◽  
Atul Kumar Tiwari ◽  
Munesh Kumar Gupta ◽  
Govind Pandey ◽  
Roger J Narayan
Keyword(s):  
Electron Microscopy ◽  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Acinetobacter Baumannii ◽  
Noble Metal ◽  
Bimetallic Nanoparticles ◽  
Metal Cations ◽  
Microscopy Imaging ◽  
Cell Wall Disruption ◽  
Gold Silver

In this paper, the effects of the organic reducing agent and 3-aminopropyltrimethoxysilane on the synthesis and properties of mono-, bi-, and trimetallic noble metal nanoparticles were considered; the antimicrobial activity of these nanomaterials was also evaluated. It was shown that 3-aminoptopyltrimethoxysilane-treated noble metal cations undergo rapid conversion into nanoparticles in the presence of three organic reducing agents, namely, 3-glycidoxypropyltrimethoxysilane (3-GPTMS), cyclohexanone and formaldehyde; the nanoparticles were formed on the order of one minute under microwave incubation. Bimetallic nanoparticles were formed by simultaneous or sequential reduction of metal cations; the formation of trimetallic nanoparticles containing gold, silver and palladium was demonstrated using a similar approach. The nanoparticles were characterized using UV-Visible light spectrophotometry, transmission electron microscopy and zeta potential measurements. All three nanoparticles exhibited a size [Formula: see text]10[Formula: see text]nm size. The nanoparticles showed antimicrobial activity against Acinetobacter baumannii. Scanning electron microscopy imaging showed an alteration in the size and shape of nanoparticle-treated bacterium, with bleb formation and cell wall disruption observed within 1[Formula: see text]h of incubation at the MBC values of the nanoparticles. Fluorescence spectrophotometric imaging of silver nanoparticle-Acinetobacter baumannii interactions suggested selective binding of silver nanoparticles to surface proteins. Our results showed the preparation of the novel silver nanoparticles with potent Anti-Acinetobacter baumannii activity, which can serve as an alternative to conventional antimicrobial agents.

AN OVERVIEW OF SILVER NANOPARTICLES

2021 ◽  
Vol 12 (4) ◽  
pp. 170-175
Author(s):  
M Mohan Varma ◽  
Indukuri Kinnera
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Photoelectron Spectroscopy ◽  
Localized Surface Plasmon ◽  
Nano Materials ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Biological Technique ◽  
Physical And Chemical

During the past few years, silver nanoparticles became one amongst the foremost investigated and explored technology derived nanostructures, given the fact that nano silver primarily based materials established to possess attention-grabbing, challenging, and inspiring characteristics appropriate for numerous applications. Generation after generation, the postulates come back forth regarding properties of silver for the traditional Greeks cook from silver pots and the recent saying “born with silver spoon in his mouth” so show that ingestion with a silver spoon was renowned as uncontaminated. Silver has an excessive amount of contemporary industrial uses and is considered as a store of wealth. Silver nanoparticles are unit one amongst the foremost very important and interesting nano materials among many metals like nanoparticles. they need been urban as a complicated unit within the field of nanotechnology. This review predominately focused on advantages and synthesis of silver nanoparticles using physical, chemical, and biological ways. However, physical, and chemical methods are harmful and expensive however the biological technique is easy, rapid, non- noxious and ecofriendly. It additionally explains regarding mechanism of action, numerous characterization techniques as well as UV- Visible Spectroscopy, Localized Surface Plasmon Resonance (LSPR), X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Fourier Transform Infrared (FTIR) spectroscopy, X- ray Photoelectron Spectroscopy (XPS), Dynamic Light Scattering (DLS), Zeta Potential and finally concluded with numerous applications.

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