“…In previous years, many methods have been developed for the selective and sensitive recognition of Cu(II) ions, viz. electrochemical techniques, inductively coupled plasma-mass spectrometry, 31,32 inductively coupled plasma atomic emission spectroscopy (ICP-AES), voltammetry, atomic absorption-emission spectroscopy, electrochemical luminescent sensing, 33 colorimetric methods, 34 and fluorescent detection. 35,36 Among these methods, a technique based on fluorescent probes has emerged as a convenient approach because of its high sensitivity, easy availability, low limit of detection, quick response time, and low cost.…”