Accelerated nanoparticles synthesis in alcohol-water-mixture-based solution plasma.

Area of Science:

• Nanotechnology
• Materials Science
• Physical Chemistry

Background:

• Gold nanoparticles (AuNPs) have diverse applications in catalysis, sensing, and medicine.
• Traditional synthesis methods for AuNPs can be time-consuming and require specific conditions.
• Developing rapid and efficient synthesis techniques for AuNPs is crucial for their broader application.

Purpose of the Study:

• To investigate a novel, high-speed synthesis of gold nanoparticles (AuNPs) using a solution plasma process (SPP).
• To determine the effect of ethanol-water mixture composition on the AuNP synthesis rate.
• To identify the optimal conditions for maximizing the AuNP synthesis speed.

Main Methods:

• Synthesis of AuNPs using a solution plasma process (SPP).
• Utilizing ethanol-water mixtures with varying ethanol mole fractions (χethanol).
• Analysis of the reduction rate of gold chloride ions to AuNPs under SPP conditions.

Main Results:

• An extraordinary high-speed synthesis of AuNPs was achieved.
• The reaction rate of AuNP synthesis was significantly influenced by the ethanol mole fraction.
• A maximum synthesis rate, 35.2 times faster than in pure water, was observed at a specific ethanol concentration.
• This optimal rate correlated with a drastic change in the partial molar volumes of ethanol and water.

Conclusions:

• Solution plasma process in ethanol-water mixtures offers a highly efficient route for AuNP synthesis.
• The observed rate enhancement is linked to specific physicochemical properties of the ethanol-water mixture at a critical composition.
• This method presents a promising advancement for rapid and scalable production of gold nanoparticles.