Light-concentrating plasmonic Au superstructures with significantly visible-light-enhanced catalytic performance

Area of Science:

• Materials Science
• Nanotechnology
• Photocatalysis

Background:

• Noble metals like gold exhibit surface plasmon resonance for light absorption.
• Noble metals are typically not considered photocatalysts due to their continuous band structures.
• Photocatalytic systems based on pure noble metal nanostructures are rarely reported.

Purpose of the Study:

• To develop novel plasmonic gold (Au) superstructures.
• To investigate their enhanced visible-light absorption properties.
• To evaluate their efficiency in photocatalytic reactions.

Main Methods:

• Synthesis of three distinct Au superstructures (nanoparticles, multiple-twinned nanoparticles, nanoworms) on SiO2 nanospheres.
• Characterization of plasmon resonance coupling and light absorption.
• Assessment of catalytic efficiency for p-nitrophenol reduction under visible light.

Main Results:

• The developed Au superstructures exhibited enhanced broadband visible-light absorption.
• Plasmon resonance coupling within superstructures intensified light absorption and hot electron/hole generation.
• Significantly enhanced visible-light catalytic efficiency (up to ~264%) was observed for p-nitrophenol reduction.

Conclusions:

• Novel plasmonic Au superstructures can overcome the limitations of pure noble metals in photocatalysis.
• These superstructures show promising potential for efficient visible-light-driven catalytic applications.
• The findings open new avenues for designing noble metal-based photocatalysts.