A greener route to high-performance sensors<\/p>\n
To overcome this, the researchers engineered a nanocomposite filament by combining recycled polylactic acid (PLA) with the gold nanoparticle coated graphite, carbon black and castor oil.<\/p>\n
Graphite flakes acted as the reducing agent during nanoparticle synthesis, helping to avoid more chemically intensive preparation methods. The resulting material demonstrated improved electron-transfer behaviour and enhanced sensing capability compared with conventional conductive filaments.<\/p>\n
Importantly, the functional nanoparticle coated flakes were incorporated directly into the printable filament itself, avoiding the need for complex post-print modification.<\/p>\n
Detecting toxic lead at ultra-low levels<\/p>\n
As a proof of concept, the team used the 3D-printed electrodes to detect lead(II) contamination in river water samples.<\/p>\n
The sensors achieved sub-ppb detection limits, which are below drinking-water safety thresholds, demonstrating the potential of the electrodes for rapid, low-cost environmental monitoring.<\/p>\n
Beyond water testing, the platform could support future applications in biosensing and wearable technologies.<\/p>\n
Sustainability meets scalable manufacturing<\/p>\n
By combining recycled materials, greener nanoparticle synthesis and 3D-printing, the study highlights how sustainable materials design can be integrated into advanced analytical technologies without compromising performance.<\/p>\n
The work offers a scalable route towards smarter, more accessible sensing devices that could help expand environmental monitoring and next-generation analytical testing.<\/p>\n
For researchers working across electrochemistry, 3D-printing, nanomaterials and sustainable materials science, the study provides valuable insight into how functional nanocomposites can be engineered for real-world sensing applications. The full paper explores the synthesis and preparation of the filament, material characterisation and sensing performance in greater detail.<\/p>\n