1 <h5>Introduction</h5> In the past years, many fluorescence sensors were reported for detecting Cu 2+ with high sensitivity, adaptability and repeatability  . These fluorescence sensors have been developed on the basis of fluorescent molecules (i.e., pyrene, cyanine, naphthalimide, fluorescein, rhodamine, coumarin, quinolone and BODIPY) which provide a wide emission range from ultraviolet to near infrared, by using various sensing mechanisms (i.e., photoinduced electron transfer (PET), fluorescence resonance energy transfer (FRET), internal charge transfer (ICT), chelation enhanced fluorescence quenching (CHEQ), and dimerization fluorescence)  . Moreover, nanoparticles, DNA templates and peptides also have been used for the design of Cu 2+ sensors due to their unique photophysical features and high biological compatibility  . Currently, numerous of fluorescence sensors have been designed on the sensing mechanism of fluorescence quenching (Turn-Off) caused by the interaction between Cu 2+ and sensor. Unfortunately, significant interference has been observed from other heavy metal ions (Hg 2+ , Pb 2+ , and Ni 2+ ) and Cu 2+ itself due to heavy metal quenching effect. Thus, developing a sensor based on the signal transduction of fluorescence enhancement (Turn-On) is highly desirable  .</P>In this paper, we report the synthesis and spectroscopic properties of
Sensors and Actuators B: Chemical – Elsevier
Published: Jan 1, 2013
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