Metastability of the atomic structures of size-selected gold nanoparticles

Nanoscale ◽  
2015 ◽  
Vol 7 (15) ◽  
pp. 6498-6503 ◽  
Author(s):  
Dawn M. Wells ◽  
Giulia Rossi ◽  
Riccardo Ferrando ◽  
Richard E. Palmer
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoclusters ◽  
Atomic Structures

All nanostructures are metastable – but some are more metastable than others. Size-selected gold nanoclusters present icosahedral, decahedral or fcc structures. Fcc are the most stable; the others are locked in by template growth.

scholarly journals Development of Bio-Functionalized, Raman Responsive, and Potentially Excretable Gold Nanoclusters

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2181
Author(s):  
Ryan D. Mellor ◽  
Andreas G. Schätzlein ◽  
Ijeoma F. Uchegbu
Keyword(s):  
Particle Size ◽  
Gold Nanoparticles ◽  
Ethylene Glycol ◽  
Gold Nanoclusters ◽  
Physiological Conditions ◽  
Non Invasive ◽  
In Vivo Detection ◽  
Raman Response ◽  
Octadecyl Amine

Gold nanoparticles (AuNPs) are used experimentally for non-invasive in vivo Raman monitoring because they show a strong absorbance in the phototherapeutic window (650–850 nm), a feature that is accompanied by a particle size in excess of 100 nm. However, these AuNPs cannot be used clinically because they are likely to persist in mammalian systems and resist excretion. In this work, clustered ultrasmall (sub-5 nm) AuNP constructs for in vivo Raman diagnostic monitoring, which are also suitable for mammalian excretion, were synthesized and characterized. Sub-5 nm octadecyl amine (ODA)-coated AuNPs were clustered using a labile dithiol linker: ethylene glycol bis-mercaptoacetate (EGBMA). Upon clustering via a controlled reaction and finally coating with a polymeric amphiphile, a strong absorbance in the phototherapeutic window was demonstrated, thus showing the potential suitability of the construct for non-invasive in vivo detection and monitoring. The clusters, when labelled with a biphenyl-4-thiol (BPT) Raman tag, were shown to elicit a specific Raman response in plasma and to disaggregate back to sub-5 nm particles under physiological conditions (37 °C, 0.8 mM glutathione, pH 7.4). These data demonstrate the potential of these new AuNP clusters (Raman NanoTheranostics—RaNT) for in vivo applications while being in the excretable size window.

Gold nanoclusters reductively deposited on porous silicon: morphology and electronic structures

1998 ◽  
Vol 76 (11) ◽  
pp. 1707-1716 ◽  
Author(s):  
I Coulthard ◽  
S Degen ◽  
Y -J Zhu ◽  
T K Sham
Keyword(s):  
Gold Nanoparticles ◽  
Porous Silicon ◽  
Photoelectron Spectroscopy ◽  
Gold Nanoclusters ◽  
Gold Complex ◽  
X Ray Diffraction ◽  
Complex Ions ◽  
X Ray ◽  
Preparation Conditions ◽  
P Type

Utilizing porous silicon as a reducing agent and a substrate, gold complex ions [AuCl4]- were reduced from aqueous solution to produce nanoparticles of gold upon the surface of porous silicon. Scanning electron microscopy (SEM) was utilized to study the morphology of the porous silicon layers and the deposits of gold nanoparticles. It is found that preparation conditions have a profound effect on the morphology of the deposits, especially on porous silicon prepared from a p-type wafer. The gold nanoparticles, varying from micrometric aggregates of clusters of the order of 10 nm, to a distribution of nearly spherical clusters of the order of 10 nm, to strings of ~10 nm were observed and compared to bulk gold metal using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and X-ray absorption spectroscopy (XAS). These techniques confirm and complement the SEM findings. The potential for this reductive deposition technique is noted.Key words: gold nanostructures, reductive deposition, porous silicon, morphology, X-ray spectroscopy.

Engineering microencapsulation of highly catalytic gold nanoclusters for an extreme thermal stability

Nanoscale ◽  
2015 ◽  
Vol 7 (48) ◽  
pp. 20584-20592 ◽  
Author(s):  
Ana Sousa-Castillo ◽  
Mathilde Gauthier ◽  
Raul Arenal ◽  
Moisés Pérez-Lorenzo ◽  
Miguel A. Correa-Duarte
Keyword(s):  
Thermal Stability ◽  
Gold Nanoparticles ◽  
Gold Nanoclusters ◽  
Synthetic Strategy

A synthetic strategy based on microencapsulation endows ultra-small gold nanoparticles with an outstanding thermal stability.

Colorimetric and fluorometric aggregation-based heparin assay by using gold nanoclusters and gold nanoparticles

2019 ◽  
Vol 186 (12) ◽  
Author(s):  
Zhipeng Zhang ◽  
Sha Li ◽  
Pengcheng Huang ◽  
Jiayu Feng ◽  
Fang-Ying Wu
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoclusters

Facile Solvothermal Preparation of Monodisperse Gold Nanoparticles and Their Engineered Assembly of Ferritin–Gold Nanoclusters

Langmuir ◽  
2013 ◽  
Vol 29 (50) ◽  
pp. 15698-15703 ◽  
Author(s):  
Jonghoon Choi ◽  
Sungwook Park ◽  
Zoran Stojanović ◽  
Hyung-Seop Han ◽  
Jongwook Lee ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoclusters ◽  
Solvothermal Preparation

An inner-filter-effect based ratiometric fluorescent sensor for the detection of uranyl ions in real samples

2022 ◽  
Author(s):  
Huarui Nan ◽  
Yunhai Liu ◽  
Wenjuan Gong ◽  
Hongbo Peng ◽  
Youqun Wang ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Fluorescent Sensor ◽  
Gold Nanoclusters ◽  
Inner Filter Effect ◽  
Uranyl Ions ◽  
Ratiometric Fluorescence ◽  
Real Samples ◽  
Filter Effect ◽  
Water Based

In this work, a ratiometric fluorescence system was designed for detection of trace UO22+ in water based on inner filter effect (IFE) between gold nanoparticles (AuNPs) and gold nanoclusters (AuNCs)....

Effects of Size, Shape, Surface Charge and Functionalization on Cytotoxicity of Gold Nanoparticles

Nano LIFE ◽  
2015 ◽  
Vol 05 (01) ◽  
pp. 1540003 ◽  
Author(s):  
Zhuheng Li ◽  
Zhen Lei ◽  
Junping Zhang ◽  
Dianjun Liu ◽  
Zhenxin Wang
Keyword(s):  
Gold Nanoparticles ◽  
Data Analysis ◽  
Physicochemical Properties ◽  
Surface Charge ◽  
Gold Nanorods ◽  
Gold Nanoclusters ◽  
Gold Nanoshells ◽  
Cell Models ◽  
Future Prospects ◽  
Au Nps

Gold nanoparticles ( Au NPs) are emerging as promising nanomaterials from which we construct diagnostic and therapeutic nanosystems. For understanding the fundamental behaviors of Au NPs with biological systems, interactions of Au NPs and cells should be considered first. In this review, we present a detailed analysis of data on the cytotoxicity of most popular Au NPs including gold nanoclusters ( Au NCs), spherical Au NPs, gold nanoshells ( Au NSs) and gold nanorods ( Au NRs). Relationships correlating the cell models, physicochemical properties (size, shape, chemical functionality and surface charge) of Au NPs and cytotoxicity are discussed on the basis of data analysis. Some general conclusions, current challenges and future prospects/solutions on the issue have been provided.

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