Conventional methods for the measurement of Cu2+ include
atomic absorption spectrometry (AAS) [6], inductively coupled
plasma atomic emission spectrometry (ICP-AES) [7], inductively
coupled plasma mass spectrometry (ICP-MS) [8], voltammetry [9]
and fluorescence spectrometry [10]. Although these methods
provide high sensitivity and selectivity, they require expensive
instrumentation, laboratory setup, and high operating cost, which
makes these methods unsuitable for field monitoring. Therefore,
there is an increasing interest in the development of simple and
low-cost sensors for the highly sensitive and selective detection of
Cu2+ that can allow reliable on-site real time detection.