Plasmonic nanoparticles and their assemblies are a promising platform in a diverse array of technologies, ranging from plasmonic imaging, therapeutics and sensors to large area coatings, filters, and optical attenuators, due to the extremely intense light-matter interactions.  Development of the technologies relies on reproducible, scalable, and cost-effective synthesis methods, which provide facile tuning of structure and surface functionalization.  Most studies on gold nanorods have focused on relatively short rods with lengths of around 100 nm or less and absorption in the visible to near IR wavelength.  The development of gold nanowires (Au NWs) extend these plasmonic characteristics to the mid-IR for optical filtering, subwavelength imaging, data storage, and sensor devices.  However, low-yield and complicated synthesis steps have limited these opportunities.  Herein, we demonstrated the scale up synthesis of Au NWs with Mid IR absorption (2 to 5 µm) via optimization of reaction parameters based on seed mediated protocol. The production yield up to 0.5 mg/mL was achieved without compromising gold conversion yield and shape purity.  We believe that the confluence of scalable processes, high extinction coefficients, and wavelength tunability of Au NWs will spur adoption for targeted applications that utilize IR light.

Scalable synthesis of infrared absorbing gold nanowires

ACS Spring 2022

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.