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.

scholarly journals Effect of Particle Diameter and Surface Composition on the Spontaneous Fusion of Monolayer-Protected Gold Nanoparticles with Lipid Bilayers

Nano Letters ◽  
2013 ◽  
Vol 13 (9) ◽  
pp. 4060-4067 ◽  
Author(s):  
Reid C. Van Lehn ◽  
Prabhani U. Atukorale ◽  
Randy P. Carney ◽  
Yu-Sang Yang ◽  
Francesco Stellacci ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Lipid Bilayers ◽  
Surface Composition ◽  
Particle Diameter

scholarly journals Effects of Aromatic Thiol Capping Agents on the Structural and Electronic Properties of CdnTen (n = 6,8 and 9) Quantum Dots

2021 ◽  
Vol 8 ◽  
Author(s):  
Muhammad Imran ◽  
Muhammad Jawwad Saif ◽  
Tahir Farooq ◽  
Javed Iqbal
Keyword(s):  
Quantum Dots ◽  
Electronic Properties ◽  
Absorption Spectra ◽  
Capping Agents ◽  
Aromatic Thiol ◽  
Td Dft ◽  
Structural And Electronic Properties ◽  
Aromatic Thiols ◽  
Capping Ligands ◽  
Homo Lumo

Thiols are efficient capping agents used for the synthesis of semiconductor and metal nanoparticles. Commonly, long-chain thiols are used as passivating agents to provide stabilization to nanoparticles. Theoretical methods rarely reported aromatic thiol ligands’ effects on small-sized CdTe quantum dots’ structural and electronic properties. We have studied and compared the structural and electronic properties of (i) bare and (ii) aromatic thiols (thiophenol, 4-methoxybenzenethiol, 4-mercaptobenzonitrile, and 4-mercaptobenzoic acid) capped CdnTen quantum dots (QDs). Aromatic thiols are used as thiol-radical because of the higher tendency of thiol-radicals to bind with Cd atoms. This work provides an understanding of how the capping agents affect specific properties. The results show that all aromatic thiol-radical ligands caused significant structural distortion in the geometries. The aromatic thiol-radical ligands stabilize LUMOs, stabilize or destabilize HOMOs, and decrease HOMO-LUMO gaps for all the capped QDs. The stabilization of LUMOs is more pronounced than the destabilization of HOMOs. We also studied the effect of solvent on structural and electronic properties. TD-DFT calculations were performed to calculate the absorption spectra of bare and capped QDs, and all the capping ligands resulted in the redshift of absorption spectra.

scholarly journals Comparison of Triangular Silver Nanoprisms with Different Capping Agents and Structural Size for H2O2 Etching-Based Biosensors

NANO ◽  
2018 ◽  
Vol 13 (02) ◽  
pp. 1850022 ◽  
Author(s):  
Lishi Huang ◽  
Caihong Yuan ◽  
Wenli Chen ◽  
Fanshu Zeng ◽  
Hui Xu ◽  
...  
Keyword(s):  
Point Of Care ◽  
High Sensitivity ◽  
Wavelength Shift ◽  
Time Saving ◽  
Capping Agents ◽  
Silver Nanoprisms ◽  
Structural Size ◽  
Point Of Care Diagnostics ◽  
Citrate Capping ◽  
Capping Ligands

This study compared the susceptibility of different triangular silver nanoprisms (TSNPRs) towards the etching of hydrogen peroxide (H2O2), a catalytical product of glucose oxidase (GOx). The influence of capping agents and structural size have been explored towards the oxidation of silver nanoprisms. Results indicated that the etching of the TSNPRs was extremely effected by surface capping agents, in which citrate contributed a highest H2O2-sensitive effect in the absence of secondary capping ligands (e.g., glycerol and ethanol). Meanwhile, compared to bigger TSNPRs, smaller nanoprisms exhibited a different signal output of plasma resonance peak through intensity decrease rather than wavelength shift, making them more H2O2-etching susceptibile. In virtue of GOx etching-based system, TSNPRs with a small size and citrate capping were served as a substitute for big nanoprisms to sense glucose, offering a number of advantages such as high sensitivity, improved calibration, time-saving and extended detection ranges. Moreover, the small sized TSNPRs capping with citrate alone have been expected to be of great interest in the trace of GOx, providing an ultrahigh sensitive GOx etching-based analytical platform for point-of-care diagnostics towards other analytes (e.g., DNA, protein).

Weakly bound capping agents on gold nanoparticles in catalysis: Surface poison?

2010 ◽  
Vol 36 (21) ◽  
pp. 111-121
Author(s):  
A. Quintanilla ◽  
V.C.L. Butselaar-Orthlieb ◽  
C. Kwakernaak ◽  
W.G. Sloof ◽  
M.T. Kreutzer ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Weakly Bound ◽  
Capping Agents

Deciphering the Surface Composition and the Internal Structure of Alloyed Silver-Gold Nanoparticles

2018 ◽  
Vol 24 (36) ◽  
pp. 9051-9060 ◽  
Author(s):  
Viktoria Grasmik ◽  
Christian Rurainsky ◽  
Kateryna Loza ◽  
Mathies V. Evers ◽  
Oleg Prymak ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Internal Structure ◽  
Surface Composition

scholarly journals Optimization of the Electrodeposition of Gold Nanoparticles for the Application of Highly Sensitive, Label-Free Biosensor

Biosensors ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 50 ◽  
Author(s):  
Hao-Chun Chiang ◽  
Yanyan Wang ◽  
Qi Zhang ◽  
Kalle Levon
Keyword(s):  
Gold Nanoparticles ◽  
Signal Amplification ◽  
Electrochemical Biosensor ◽  
Aqueous Electrolyte ◽  
Label Free ◽  
Reduction Step ◽  
Glucose Biosensors ◽  
Highly Sensitive ◽  
Amperometric Glucose Biosensors ◽  
Aunp Surface

A highly sensitive electrochemical biosensor with a signal amplification platform of electrodeposited gold nanoparticle (AuNP) has been developed and characterized. The sizes of the synthesized AuNP were found to be critical for the performance of biosensor in which the sizes were dependent on HAuCl4 and acid concentrations; as well as on scan cycles and scan rates in the gold electro-reduction step. Systematic investigations of the adsorption of proteins with different sizes from aqueous electrolyte solution onto the electrodeposited AuNP surface were performed with a potentiometric method and calibrated by design of experiment (DOE). The resulting amperometric glucose biosensors was demonstrated to have a low detection limit (> 50 μM) and a wide linear range after optimization with AuNP electrodeposition.

Nanoplasmonic sensor array for the detection and discrimination of pesticide residues in citrus fruits

2020 ◽  
Vol 12 (48) ◽  
pp. 5877-5884
Author(s):  
M. Reza Mirghafouri ◽  
Samira Abbasi-Moayed ◽  
Forough Ghasemi ◽  
M. Reza Hormozi-Nezhad
Keyword(s):  
Gold Nanoparticles ◽  
Pesticide Residues ◽  
Sensor Array ◽  
Citrus Fruits ◽  
Capping Agents

The aggregation-induced alterations in gold nanoparticles (AuNPs) with only two different capping agents can detect and identify pesticide residues in lime.

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
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