Gold Nanoparticle Synthesis
Gold Nanoparticle Synthesis - Related Videos
13:42
Gold Nanoparticle Synthesis
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Cited by 2 •
2021
A protocol for synthesizing ~12 nm diameter gold nanoparticles (Au nanoparticles) in an organic solvent is presented. The gold nanoparticles are capped with oleylamine ligands to prevent agglomeration. The gold nanoparticles are soluble in organic solvents such as toluene.
14:18
Synthesis, Assembly, and Characterization of Monolayer Protected Gold Nanoparticle Films for Protein Monolayer Electrochemistry
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Cited by 1 •
2011
Alkanethiolate stabilized gold colloids known as monolayer protected clusters (MPCs) are synthesized, characterized, and assembled into thin films as an adsorption interface for protein monolayer electrochemistry of simple redox protein like Pseudomonas aeruginosa azurin (AZ) and cytochrome c (cyt c).
07:08
In Situ Synthesis of Gold Nanoparticles without Aggregation in the Interlayer Space of Layered Titanate Transparent Films
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Cited by 1 •
2017
Here, we present a protocol for the in situ synthesis of gold nanoparticles (AuNPs) within the interlayer space of layered titanate films without the aggregation of AuNPs. No spectral change was observed even after 4 months. The synthesized material has expected applications in catalysis, photo-catalysis, and the development of cost-effective plasmonic devices.
11:58
Synthesis and Functionalization of Nitrogen-doped Carbon Nanotube Cups with Gold Nanoparticles as Cork Stoppers
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Cited by 10 •
2013
We discussed the synthesis of individual graphitic nanocups using a series of techniques including chemical vapor deposition, acid oxidation and probe-tip sonication. By citrate reduction of HAuCl4, the graphitic nanocups were effectively corked with gold nanoparticles due to the chemically reactive edges of the cups.
08:21
A Simple Method for the Size Controlled Synthesis of Stable Oligomeric Clusters of Gold Nanoparticles under Ambient Conditions
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Cited by 4 •
2016
We describe a simple method for producing highly stable oligomeric clusters of gold nanoparticles via the reduction of chloroauric acid (HAuCl4) with sodium thiocyanate (NaSCN). The oligoclusters have a narrow size distribution and can be produced with a wide range of sizes and surface coats.
FAQs
A reducing agent converts gold ions from a precursor such as chloroauric acid into elemental gold. Once enough reduced gold forms, small nuclei appear and serve as starting points for further growth. The balance between nucleation and growth affects the resulting particle dimensions and structure, so reaction conditions must be controlled to obtain material appropriate for a particular bioengineering use.
Stabilizing molecules help prevent newly formed gold particles from aggregating during and after synthesis. They also influence surface properties and can affect the structures that develop as particles grow. This stabilization is especially important in bioengineering because the particle surface must remain sufficiently accessible and controlled for later attachment of functional biomolecules or incorporation into diagnostic and delivery platforms.
Reducing-agent concentration, temperature, and stabilizer composition are key variables controlling the final nanoparticles. Changing these conditions can alter how quickly gold ions are reduced, how nuclei form, and how particles grow or remain dispersed. Adjusting the variables therefore provides a route to tailor particle characteristics for optical detection, imaging, drug delivery, or other biological applications.
A typical workflow begins by preparing a gold-ion precursor, such as chloroauric acid, and introducing a reducing agent under controlled reaction conditions. Reduction produces elemental gold, followed by nucleation and particle growth. Stabilizing molecules limit aggregation and help shape the final product. Researchers then relate the chosen conditions to the particle properties needed for a bioengineering application.
Researchers tune the reducing-agent concentration, reaction temperature, and stabilizer composition rather than treating synthesis as a fixed recipe. These adjustments influence particle size, shape, dispersion, and surface characteristics. The resulting material can then be selected for requirements such as sensitive optical detection, imaging performance, drug-delivery design, or efficient attachment of functional biomolecules.
Their optical properties support sensitive detection, while their surfaces can be modified through functional biomolecule attachment. Together, these features allow gold nanoparticles to contribute to biosensors, imaging systems, drug-delivery platforms, and diagnostics. In bioengineering, synthesis conditions matter because the particles must combine suitable physical characteristics with surfaces that support the intended biological interaction or analytical function.