Extinction coefficient of gold nanoparticles with different sizes and different capping ligands

2007 ◽  
Vol 58 (1) ◽  
pp. 3-7 ◽  
Author(s):  
Xiong Liu ◽  
Mark Atwater ◽  
Jinhai Wang ◽  
Qun Huo
Keyword(s):  
Gold Nanoparticles ◽  
Extinction Coefficient ◽  
Capping Ligands

Rational and Combinatorial Design of Peptide Capping Ligands for Gold Nanoparticles

2004 ◽  
Vol 126 (32) ◽  
pp. 10076-10084 ◽  
Author(s):  
Raphaël Lévy ◽  
Nguyen T. K. Thanh ◽  
R. Christopher Doty ◽  
Irshad Hussain ◽  
Richard J. Nichols ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Combinatorial Design ◽  
Capping Ligands

A Single Step Fast Track Methodology for In-Situ Detection of Hazardous Melamine by Using Highly Sensitive Polyphenolics Modified Nanogold Probe

2019 ◽  
Vol 19 (11) ◽  
pp. 7229-7235
Author(s):  
Anila Arshad ◽  
Raheel Akram ◽  
Shahid Iqbal Rana ◽  
Ghulam Hussain ◽  
Sami Ullah Dar ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Fast Track ◽  
Raw Milk ◽  
Single Step ◽  
Hydroxyl Group ◽  
Time Saving ◽  
Au Nps ◽  
Highly Sensitive ◽  
Capping Ligands ◽  
In Situ Detection

A single step fast track method is proposed to determine melamine based on strong hydrogen bonding between exocyclic amine group in melamine moiety and hydroxyl group of tannic acid (TA); acting as reducing and functionalizing agent for synthesis of gold nanoparticles (Au NPs). The proposed strategy is facile and highly time saving; as the detection of melamine with labelfree gold nanoparticles was accomplished within five minutes. The colorimetric probe exhibits high detection limit of 8 nM for melamine determination in raw milk, which is very low as compared to other capping ligands employed for Au NPs such as borohydride, citrate and 3,5-dihydroxybenzoic acid. The results show a highly sensitive linear range (0.03–2.5 μM) between absorption ratio and concentration of melamine with a correlation coefficient of 0.991. Proposed methodology is proven effective for on-site screening without using costly instrumentation.

scholarly journals One-pot synthesis of ultrafine amphiphilic Janus gold nanoparticles by toluene/water emulsion reaction

RSC Advances ◽  
2017 ◽  
Vol 7 (81) ◽  
pp. 51605-51611 ◽  
Author(s):  
Kun Luo ◽  
Chengliang Hu ◽  
Yujia Luo ◽  
Degui Li ◽  
Yongdong Xiang ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Phase Separation ◽  
One Pot ◽  
Water Emulsion ◽  
One Pot Synthesis ◽  
Capping Ligands ◽  
Spontaneous Phase

Spontaneous phase separation of capping ligands at emulsion interfaces was used to synthesize amphiphilic Janus gold nanoparticles in batch.

scholarly journals Technical note: optical extinction coefficient of polydisperse spherical gold nanoparticles in water

2017 ◽  
Vol 12 (4) ◽  
Author(s):  
Jia Cherng Chong ◽  
Lee Siew Ling ◽  
Noriah Bidin
Keyword(s):  
Gold Nanoparticles ◽  
Extinction Coefficient ◽  
Spectral Characteristics ◽  
Particle Diameter ◽  
Resonance Wavelength ◽  
Dipole Approximation ◽  
Technical Note ◽  
Particle Sizes ◽  
Optical Extinction ◽  
Plasmon Resonance Peak

The extinction coefficients of polydispersed gold nanoparticles up to σ = 360 nm were computed via exact solution of Mie theory. A narrow extinction peak around 520 nm occurs for mean particle sizes <d> within dipole approximation limit. Spectral characteristics for extinction coefficient computed based on increasing mean particle sizes, degree of polydispersity, composition ratio of bimodal size distributions and changes in dispersant temperature are compared. As mean particle sizes increases, the plasmon resonance peak red-shifts and broadens skewing towards infrared. Increasing polydispersity on mean particle diameter beyond dipole approximation limit decreases peak extinction coefficient values. Increasing temperature from ambient to boiling changes the peak extinction coefficient intensity value by an order of 10^-13 while resonance wavelength remains unchanged.

Extinction coefficient analysis of small alkanethiolate-stabilised gold nanoparticles

2008 ◽  
Vol 460 (1-3) ◽  
pp. 230-236 ◽  
Author(s):  
Graham A. Rance ◽  
Dan H. Marsh ◽  
Andrei N. Khlobystov
Keyword(s):  
Gold Nanoparticles ◽  
Extinction Coefficient

Tripodal tris-disulfides as capping agents for a controlled mixed functionalization of gold nanoparticles

2018 ◽  
Vol 42 (20) ◽  
pp. 16436-16440
Author(s):  
Giovanna De Luca ◽  
Paola Bonaccorsi ◽  
Valentina Trovato ◽  
Aurora Mancuso ◽  
Teresa Papalia ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Surface Composition ◽  
Capping Agents ◽  
Fine Control ◽  
Capping Ligands ◽  
Aunp Surface

New tris(SS)-tripodal capping ligands afford AuNP surface composition fine control and SPR sensing for TNT-like explosives.

Variable Growth and Characterizations of Monolayer-Protected Gold Nanoparticles Based on Molar Ratio of Gold and Capping Ligands

Langmuir ◽  
2018 ◽  
Vol 34 (50) ◽  
pp. 15517-15525 ◽  
Author(s):  
Seyyedamirhossein Hosseini ◽  
Nouf Alsiraey ◽  
Andrew J. Riley ◽  
Tykhon Zubkov ◽  
Trent Closson ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Molar Ratio ◽  
Capping Ligands

scholarly journals The influence of molecular mobility on the properties of networks of gold nanoparticles and organic ligands

2014 ◽  
Vol 5 ◽  
pp. 1664-1674 ◽  
Author(s):  
Edwin J Devid ◽  
Paulo N Martinho ◽  
M Venkata Kamalakar ◽  
Úna Prendergast ◽  
Christian Kübel ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Self Assembly ◽  
Microcontact Printing ◽  
Single Layer ◽  
Gold Surface ◽  
Tunnel Barrier ◽  
Dynamic Changes ◽  
Aromatic Molecules ◽  
Capping Ligands ◽  
Molecular Layers

We prepare and investigate two-dimensional (2D) single-layer arrays and multilayered networks of gold nanoparticles derivatized with conjugated hetero-aromatic molecules, i.e., S-(4-{[2,6-bipyrazol-1-yl)pyrid-4-yl]ethynyl}phenyl)thiolate (herein S-BPP), as capping ligands. These structures are fabricated by a combination of self-assembly and microcontact printing techniques, and are characterized by electron microscopy, UV–visible spectroscopy and Raman spectroscopy. Selective binding of the S-BPP molecules to the gold nanoparticles through Au–S bonds is found, with no evidence for the formation of N–Au bonds between the pyridine or pyrazole groups of BPP and the gold surface. Subtle, but significant shifts with temperature of specific Raman S-BPP modes are also observed. We attribute these to dynamic changes in the orientation and/or increased mobility of the molecules on the gold nanoparticle facets. As for their conductance, the temperature-dependence for S-BPP networks differs significantly from standard alkanethiol-capped networks, especially above 220 K. Relating the latter two observations, we propose that dynamic changes in the molecular layers effectively lower the molecular tunnel barrier for BPP-based arrays at higher temperatures.

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