Laser-initiated site-selective formation of fluorescing silver-iron oxide nanocomposites for electron detection

There has been ongoing interest in the fabrication of silver-iron oxide composite nanostructures due to their effectiveness in antimicrobial, catalytic, and sensing applications. However, traditional processes involve multiple steps and harsh conditions, making them time-consuming and energy-intensive. A focused laser beam is used as an alternative tool to fabricate fluorescent silver-iron oxide composite nanostructures. The rapid thermal annealing and quenching process results in uniformly distributed particles that form site-selectively in the laser-irradiated regions. When performing without demanding conditions or additives, this process is more precise, energy-efficient, and cost-effective compared to traditional methods. The presence of silver within the composite enhances the intrinsic fluorescence of Fe₃O₄ by more than 10 times through surface plasmon resonance effects. This exclusive trait turns the composite into an effective micro-beta particle detector with in situ optical feedback. This work provides a glimpse into the benefits of developing alternative synthesis processes as a means to uncover new applications.