X-ray laser

Composite number

Optics

Physics

Laser ablation synthesis in solution

Engineering

Nanomaterials

Carbon fibers

Nanoparticle

Composite material

Catalysis

Nanotechnology

Organic chemistry

Chemistry

Materials science

Laser power scaling

Hexane

Acetonitrile

Laser ablation

Methanol

Solvent

Chemical engineering

Laser

Photocatalysis

Applied Surface Science

Gold nanoparticles (Au NPs) are the most versatile nanomaterials reported to date owing to their unique physiochemical properties as well as promising various applications. Recently, many techniques have been used for the synthesis of Au NPs. In this study, various types of Au NPs were synthesized by pulsed laser ablation in liquid (PLAL) using the following four solvents: methanol, deionized (DI) water, hexane, and acetonitrile. Pulsed laser ablation in methanol and DI water is used for the synthesis of bare Au NPs, as photocatalysts. Au NPs showed an enhanced catalytic activity toward the reduction of 4-nitrophenol to 4-aminophenol. Interestingly, Au NPs prepared by PLAL using hexane and acetonitrile were encapsulated with graphitic carbon (GC) layers ([email protected]), where the solvent was used as a carbon source for the GC layers. In contrast to bare Au NPs, [email protected] NPs exhibited no catalytic activity due to the protective GC layers formed on Au NPs. On the other hand, [email protected] NPs demonstrated a high corrosion resistance against strong acids. The present study revealed that the PLA of Au plate in various liquid medium is a facile method for the synthesis of excellent catalytic or acid resistant Au NPs with a unique surface structure.

Selective synthesis of Au and graphitic carbon-encapsulated Au (Au@GC) nanoparticles by pulsed laser ablation in solvents: Catalytic Au and acid-resistant Au@GC nanoparticles