Chemical functionalization and modification of surface-bound cystamine–glycine monolayers on gold nanoparticles

2008 ◽  
Vol 86 (5) ◽  
pp. 368-375 ◽  
Author(s):  
Mita Dasog ◽  
Amir Kavianpour ◽  
Matthew F Paige ◽  
Heinz-Bernhard Kraatz ◽  
Robert W.J. Scott
Keyword(s):  
Gold Nanoparticles ◽  
Au Nanoparticles ◽  
Protecting Group ◽  
Efficient Removal ◽  
Activated Esters ◽  
H Nmr ◽  
Monolayer Protected Clusters ◽  
Surface Modified ◽  
Modification Of The Surface ◽  
Post Functionalization

Herein, we report the synthesis, characterization, and post-functionalization of Au nanoparticles that have been surface-modified with glycine–cystamine (Gly-CSA) stabilizing groups. We show that Au monolayer protected clusters (MPCs) can be synthesized via the Brust–Schiffrin method using a Boc-Gly–CSA stabilizer, followed by efficient removal of the Boc protecting group with trifluoroacetic acid. The resulting Gly–CSA Au MPCs are characterized via UV–vis, TEM, and 1H NMR, and are stable in solution over long periods of time. Finally, we show that the Gly–CSA Au MPCs can be further functionalized with nearly stoichiometric yields using activated esters of stearic acid and a Bodipy dye derivative. Thus, this work provides an alternative, general approach for the modification of the surface chemistry of MPCs.Key words: gold nanoparticles, peptide stabilizers, dyes.

Surface Plasmon Effects on Photoluminescence of YAG:Ce3+-Yb3+

2016 ◽  
Vol 98 ◽  
pp. 32-37 ◽  
Author(s):  
Talib Hussain ◽  
Liang Tang ◽  
Hui Qi Ye ◽  
Dong Xiao
Keyword(s):  
Gold Nanoparticles ◽  
Quantum Yield ◽  
Surface Plasmon ◽  
Decay Time ◽  
Au Nanoparticles ◽  
Absorption Peak ◽  
Photoluminescence Band ◽  
Band Ratio ◽  
Spherical Gold Nanoparticles ◽  
Surface Modified

Phosphor materials have fascinating applications in the field of photovoltaic and biosensors but low quantum yield is a major hurdle in their applications. In this paper, the influence of surface plasmon on the photoluminescence is investigated with surface modified YAG:Ce3+-Yb3+ coupled with spherical gold nanoparticles. The YAG:Ce3+-Yb3+ photoluminescence band ratio Yb/Ce rise from 0.25 to 0.32 with the plasmon effects. For the photoluminescence, the decay time of Ce reduces from 31.9 ns to 29.9 ns while for Yb from 54.2 ms to 52.0 ms respectively. Further, the plasmon absorption peak is also observed in the spectra of YAG:Ce3+-Yb3+/Au nanoparticles system. The results indicate that the field inside the phosphors has been modulated with surface plasmon of gold nanoparticles.

The Stabilization of Supported Au Nanoparticles in a Highly Sintering Environment using High Surface Free Energy Pt and Ru Cores

2021 ◽  
Author(s):  
Kerry O-Connell ◽  
John R Monnier ◽  
John Regalbuto
Keyword(s):  
Gold Nanoparticles ◽  
Free Energy ◽  
Surface Free Energy ◽  
Au Nanoparticles ◽  
High Surface ◽  
Chemical Environment ◽  
Core Shell

In an effort to stabilize gold nanoparticles which sinter rapidly in a highly corrosive chemical environment, the hydrochlorination of acetylene, bimetallic Ru@Au and Pt@Au core-shell catalysts were prepared by anchoring...

scholarly journals Structural characterization of functionalized gold nanoparticles for drug delivery in cancer therapy: a NMR based approach

2015 ◽  
Vol 17 (29) ◽  
pp. 18971-18979 ◽  
Author(s):  
Sílvia C. Coelho ◽  
Maria Rangel ◽  
Maria C. Pereira ◽  
Manuel A. N. Coelho ◽  
Galya Ivanova
Keyword(s):  
Drug Delivery ◽  
Gold Nanoparticles ◽  
Cancer Therapy ◽  
Structural Characterization ◽  
Au Nanoparticles ◽  
Functionalized Gold Nanoparticles ◽  
Loaded Surface

Structure of Bortezomib loaded, surface functionalized Au nanoparticles.

scholarly journals Protected Gold Nanoparticles with Thioethers and Amines As Surrogate Ligands

2013 ◽  
Vol 2013 ◽  
pp. 1-4 ◽  
Author(s):  
M. Rafiq H. Siddiqui
Keyword(s):  
Gold Nanoparticles ◽  
Variable Temperature ◽  
Size Control ◽  
Analytical Techniques ◽  
High Resolution Electron Microscopy ◽  
Phase Method ◽  
Two Phase ◽  
H Nmr ◽  
Resolution Electron ◽  
Vis Spectroscopy

Dodecyl sulfide, dodecyl amine, and hexylamine were shown to act as surrogate ligands (L) via metastable gold nanoparticles. By collating analytical and spectroscopic data obtained simultaneously, empirical formula Au24L was assigned. These impurity-free nanoparticles obtained in near quantitative yields showing exceptional gold assays (up to 98%Au) were prepared by a modification of the two-phase method. Replacement reactions on the Au24L showed that Au:L ratios may be increased (up to Au55:L (L= (H25C12)2S)) or decreased (Au12:L (L= H2NC12H25and H2NC6H13)) as desired. This work encompassing the role of analytical techniques used, that is, elemental analysis, variable temperature1H NMR, FAB mass spectrometry, UV-Vis spectroscopy, thin film X-ray diffraction, and high-resolution electron microscopy (HREM) has implications in the study of size control, purity, stability, and metal assays of gold nanoparticles.

ChemInform Abstract: New Strategies for an Efficient Removal of the 9-Fluorenylmethoxycarbonyl (Fmoc) Protecting Group in the Peptide Synthesis.

ChemInform ◽  
2010 ◽  
Vol 31 (16) ◽  
pp. no-no
Author(s):  
Antonella Leggio ◽  
Angelo Liguori ◽  
Anna Napoli ◽  
Carlo Siciliano ◽  
Giovanni Sindona
Keyword(s):  
Peptide Synthesis ◽  
Protecting Group ◽  
Efficient Removal ◽  
Fmoc Protecting Group ◽  
New Strategies

Enhancement of efficiency in graphene/porous silicon solar cells by co-doping graphene with gold nanoparticles and bis(trifluoromethanesulfonyl)-amide

2017 ◽  
Vol 5 (35) ◽  
pp. 9005-9011 ◽  
Author(s):  
Ju Hwan Kim ◽  
Dong Hee Shin ◽  
Ha Seung Lee ◽  
Chan Wook Jang ◽  
Jong Min Kim ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Solar Cells ◽  
Porous Silicon ◽  
Au Nanoparticles ◽  
Silicon Solar Cells ◽  
Porous Si ◽  
Co Doping ◽  
Si Solar Cells ◽  
First Time

The co-doping of graphene with Au nanoparticles and bis(trifluoromethanesulfonyl)-amide is employed for the first time to enhance the performance of graphene/porous Si solar cells.

scholarly journals Nitrone Modified Gold Nanoparticles: Synthesis, Characterization and Their Potential as 18F-Labeled PET Probes via I-SPANC

2019 ◽  
Author(s):  
Sara Ghiassian ◽  
Lihai Yu ◽  
Pierangelo Gobbo ◽  
Ali nazemi ◽  
Tommaso Romagnoli ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Nmr Spectroscopy ◽  
Gold Nanoparticle ◽  
Molecular Level ◽  
Prosthetic Group ◽  
H Nmr ◽  
Nanoparticles Synthesis ◽  
Interfacial Strain ◽  
Pet Probes ◽  
High Degree

A bioorthogonal gold nanoparticle template displaying interfacial nitrone functional groups for bioorthogonal interfacial strain-promoted alkyne-nitrone cycloaddition (I-SPANC) reactions has been synthesized. The Nitrone-AuNPs were characterized in detail using <sup>1</sup>H NMR spectroscopy, TEM, TGA, and XPS and a nanoparticle raw formula was calculated. The ability to control the conjugation of molecules of interest at the molecular level onto the Nitrone-AuNPs template allowed us to create a methodology for the synthesis of AuNP-based radiolabeled probes with a high degree of loading using copper free, strained-promoted cycloaddition. To this end, we also describe the synthesis of a new prosthetic group containing a strained-alkyne capable of clicking hot <sup>18</sup>F-label onto complementary azide or nitrone labelled agents.

Aquatic Fern (AzollaSp.) Assisted Synthesis of Gold Nanoparticles

2016 ◽  
Vol 15 (01n02) ◽  
pp. 1650008 ◽  
Author(s):  
Anal K. Jha ◽  
K. Prasad
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Gold Nanoparticles ◽  
Surface Plasmon Resonance ◽  
Au Nanoparticles ◽  
X Ray ◽  
Aquatic Fern ◽  
Transmission Electron ◽  
Anthraquinone Glycosides ◽  
Uv Visible

Aquatic pteridophyte (Azolla sp.) was taken to assess its potential to synthesize the metal (Au) nanoparticles. The synthesized particles were characterized using X-ray, UV-visible, scanning and transmission electron microscopy analyses. Nanoparticles almost spherical in shape having the sizes of 5–17[Formula: see text]nm are found. UV-visible study revealed the surface plasmon resonance at 538[Formula: see text]nm. Responsible phytochemicals for the transformation were principally phenolics, tannins, anthraquinone glycosides and sugars present abundantly in the plant thereby bestowing it adaptive prodigality. Also, the use of Azolla sp. for the synthesis of gold nanoparticles offers the benefit of eco-friendliness.

The studies on highly concentrated complex dispersions of gold nanoparticles and temperature-sensitive nanogels and their application as new blood-vessel-embolic materials with high-resolution angiography

2014 ◽  
Vol 2 (36) ◽  
pp. 6044-6053 ◽  
Author(s):  
Yingying Ma ◽  
Jiangshan Wan ◽  
Kun Qian ◽  
Shinan Geng ◽  
Nijun He ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
High Resolution ◽  
Blood Vessel ◽  
Au Nanoparticles ◽  
Blood Pool ◽  
Temperature Sensitive ◽  
Colloid Stability ◽  
Blood Pool Imaging ◽  
Embolic Materials

High colloid stability of highly concentrated Au nanoparticles (GNPs) for use in blood-pool imaging was achieved, using p(N-isopropylacrylamide-co-butyl methylacrylate) nanogels.

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