Size and Shape Regulated Synthesis of Silver Nanocapsules for Highly Selective and Sensitive Ultralow Bivalent Copper Ion Sensor Application
A development of highly robust, quantitative, sensitive and naked eye colorimetric sensing of bivalent copper ion using bio-inspired synthesis of size and shape controlled silver nanocapsules (AgNCs) is reported herein. By carefully adjusting the reaction conditions, the size and shape control over the resulting AgNCs is able to be realized, with a regulated size (10 nm) and shape (capsules). Such a facile, one-pot and eco-friendly synthesized AgNCs with controlled size and shape senses selectively and sensitively the Cu2+ ion in industrial effluents with the ultralow detection limit of 2.6 × 10−9 mol L−1. The formation and sensing mechanism of the AgNCs are demonstrated and discussed. The proposed method was successfully utilized for the determination of Cu2+ in different water samples.