Evolution of the Ligand Shell Morphology during Ligand Exchange Reactions on Gold Nanoparticles

2017 ◽  
Vol 56 (43) ◽  
pp. 13521-13525 ◽  
Author(s):  
Zhi Luo ◽  
Jing Hou ◽  
Laure Menin ◽  
Quy Khac Ong ◽  
Francesco Stellacci
Keyword(s):  
Gold Nanoparticles ◽  
Ligand Exchange ◽  
Shell Morphology ◽  
Exchange Reactions ◽  
Ligand Shell

Evolution of the Ligand Shell Morphology during Ligand Exchange Reactions on Gold Nanoparticles

2017 ◽  
Vol 129 (43) ◽  
pp. 13706-13710 ◽  
Author(s):  
Zhi Luo ◽  
Jing Hou ◽  
Laure Menin ◽  
Quy Khac Ong ◽  
Francesco Stellacci
Keyword(s):  
Gold Nanoparticles ◽  
Ligand Exchange ◽  
Shell Morphology ◽  
Exchange Reactions ◽  
Ligand Shell

Ligand exchange reactions on citrate-gold nanoparticles for a parallel colorimetric assay of six pesticides

2018 ◽  
Vol 42 (11) ◽  
pp. 9080-9090 ◽  
Author(s):  
Kirankumar Rana ◽  
Jigna R. Bhamore ◽  
Jigneshkumar V. Rohit ◽  
Tae-Jung Park ◽  
Suresh Kumar Kailasa
Keyword(s):  
Gold Nanoparticles ◽  
Ligand Exchange ◽  
Colorimetric Assay ◽  
Colorimetric Method ◽  
Exchange Reactions

A rapid parallel colorimetric method was developed for identification of six pesticides (acephate, phenthoate, profenofos, acetamiprid, chlorothalonil and cartap) via ligand exchange reactions on citrate-gold nanoparticles.

Polymer-capped gold nanoparticles by ligand-exchange reactions

2008 ◽  
Vol 18 (47) ◽  
pp. 5830 ◽  
Author(s):  
Simona Rucareanu ◽  
Marco Maccarini ◽  
Jeffrey L. Shepherd ◽  
R. Bruce Lennox
Keyword(s):  
Gold Nanoparticles ◽  
Ligand Exchange ◽  
Exchange Reactions

Toward Smaller Aqueous-Phase Plasmonic Gold Nanoparticles: High-Stability Thiolate-Protected ~ 4.5 Nm Cores

2019 ◽  
Author(s):  
M. Mozammel Hoque ◽  
Kathryn M. Mayer ◽  
Arturo Ponce ◽  
Marcos M. Alvarez ◽  
Robert L. Whetten
Keyword(s):  
Gold Nanoparticles ◽  
Ligand Exchange ◽  
Shape Control ◽  
Chemical Reduction ◽  
Water Soluble ◽  
Localized Surface Plasmon ◽  
Core Diameter ◽  
Gold Core ◽  
Ligand Shell ◽  
Vis Spectroscopy

<p>Most applications of aqueous plasmonic gold nanoparticles benefit from control of the core size and shape, control of the nature of the ligand shell, and a simple and widely applicable preparation method. Surface functionalization of such nanoparticles is readily achievable but is restricted to water-soluble ligands. Here we have obtained highly monodisperse and stable <i>smaller </i>aqueous gold nanoparticles (core diameter ~ 4.5-nm), prepared from citrate-tannate precursors via ligand exchange with each of three distinct thiolates: 11-mercaptoundecanoic acid, a-R-lipoic acid, and para-mercaptobenzoic acid. These are characterized by UV-Vis spectroscopy for plasmonic properties; FTIR spectroscopy for ligand exchange confirmation; X-ray diffractometry for structural analysis; and high-resolution transmission electron microscopy for structure and size determination. Chemical reduction induces a blueshift, maximally +0.02-eV, in the localized surface-plasmon resonances band; this is interpreted as an electronic (-) charging of the MPC gold core, corresponding to a -0.5-V change in electrochemical potential.</p>

scholarly journals Toward Smaller Aqueous-Phase Plasmonic Gold Nanoparticles: High-Stability Thiolate-Protected ~ 4.5 Nm Cores

2019 ◽  
Author(s):  
M. Mozammel Hoque ◽  
Kathryn M. Mayer ◽  
Arturo Ponce ◽  
Marcos M. Alvarez ◽  
Robert L. Whetten
Keyword(s):  
Gold Nanoparticles ◽  
Ligand Exchange ◽  
Shape Control ◽  
Chemical Reduction ◽  
Water Soluble ◽  
Localized Surface Plasmon ◽  
Core Diameter ◽  
Gold Core ◽  
Ligand Shell ◽  
Vis Spectroscopy

<p>Most applications of aqueous plasmonic gold nanoparticles benefit from control of the core size and shape, control of the nature of the ligand shell, and a simple and widely applicable preparation method. Surface functionalization of such nanoparticles is readily achievable but is restricted to water-soluble ligands. Here we have obtained highly monodisperse and stable <i>smaller </i>aqueous gold nanoparticles (core diameter ~ 4.5-nm), prepared from citrate-tannate precursors via ligand exchange with each of three distinct thiolates: 11-mercaptoundecanoic acid, a-R-lipoic acid, and para-mercaptobenzoic acid. These are characterized by UV-Vis spectroscopy for plasmonic properties; FTIR spectroscopy for ligand exchange confirmation; X-ray diffractometry for structural analysis; and high-resolution transmission electron microscopy for structure and size determination. Chemical reduction induces a blueshift, maximally +0.02-eV, in the localized surface-plasmon resonances band; this is interpreted as an electronic (-) charging of the MPC gold core, corresponding to a -0.5-V change in electrochemical potential.</p>

Features of Thiolated Ligands Promoting Resistance to Ligand Exchange in Self-Assembled Monolayers on Gold Nanoparticles

2012 ◽  
Vol 65 (3) ◽  
pp. 266 ◽  
Author(s):  
Xinyue Chen ◽  
Wafaa W. Qoutah ◽  
Paul Free ◽  
Jonathan Hobley ◽  
David G. Fernig ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
High Resistance ◽  
Ligand Exchange ◽  
Rapid Screening ◽  
Self Assembled Monolayers ◽  
Self Assembled Monolayer ◽  
Ligand Shell ◽  
Assembled Monolayers ◽  
Self Assembled ◽  
Different Diameters

An important feature necessary for biological stability of gold nanoparticles is resistance to ligand exchange. Here, we design and synthesize self-assembled monolayers of mixtures of small ligands on gold nanoparticles promoting high resistance to ligand exchange. We use as ligands short thiolated peptidols, e.g. H-CVVVT-ol, and ethylene glycol terminated alkane thiols (HS-C11-EG4). We present a straightforward method to evaluate the relative stability of each ligand shell against ligand exchange with small thiolated molecules. The results show that a ligand with a ‘thin’ stem, such as HS-C11-EG4, is an important feature to build a highly packed self-assembled monolayer and provide high resistance to ligand exchange. The greatest resistance to ligand exchange was found for the mixed ligand shells of the pentapeptidols H-CAVLT-ol or H-CAVYT-ol and the ligand HS-C11-EG4 at 30:70 (mole/mole). Mixtures of ligands of very different diameters, such as the peptidol H-CFFFY-ol and the ligand HS-C11-EG4, provide only a slightly lower stability against ligand exchange. These ligand shells are thus likely to be suitable for long-term use in biological environments. The method developed here provides a rapid screening tool to identify nanoparticles likely to be suitable for use in biological and biomedical applications.

scholarly journals Ligand exchange reactions on the chiral Au38 cluster: CD modulation caused by the modification of the ligand shell composition

Nanoscale ◽  
2020 ◽  
Vol 12 (35) ◽  
pp. 18160-18170 ◽  
Author(s):  
Ani Baghdasaryan ◽  
Kévin Martin ◽  
Latévi Max Lawson Daku ◽  
Maurizio Mastropasqua Talamo ◽  
Narcis Avarvari ◽  
...  
Keyword(s):  
Exchange Reaction ◽  
Ligand Exchange ◽  
Exchange Reactions ◽  
Ligand Exchange Reaction ◽  
Ligand Shell ◽  
Shell Composition

The ligand exchange reaction between the intrinsically chiral Au38 cluster and the helical TH4 ligand: the effect of the ligand on CD properties.

Sign in / Sign up

Export Citation Format

Share Document