Mesoporous SiO2 Nanoparticles: A Unique Platform Enabling Sensitive Detection of Rare Earth Ions with Smartphone Camera.

摘要: Fast and sensitive detection of dilute rare earth species still represents a challenge for an on-site survey new resources evaluation the economic value. In this work, robust low-cost protocol has been developed to analyze concentration ions using smartphone camera. The success relies on mesoporous silica nanoparticles (MSNs) with large-area negatively charged surfaces, which cations (e.g., Eu3+) are efficiently adsorbed through electrostatic attraction enable “concentrating effect”. initial adsorption rate is as fast 4025 mg (g min)−1, capacity Eu3+ in MSNs high 4730 mg g−1 (equivalent to ~ 41.2 M) at 70 °C. concentrated can form complex light sensitizer 1,10-phenanthroline significantly enhance characteristic red emission due “antenna effect” that efficient energy transfer from ions. positive synergy enables analysis wide dynamic range limit down ~ 80 nM even Our results highlight promise fieldwork exploring valuable resources.