Surfactant‐Modulated a Highly Sensitive Fluorescent Probe of Fully Conjugated Covalent Organic Nanosheets for Detecting Copper Ions in Aqueous Solution

Abstract

Scheme 1. a) Synthesis of sp 2 -TPE-COF by Knoevenagel Condensation between ETBA and PDAN and following exfoliation treatment. b) The diagram of titration experiment for copper ion detection. c) Electron transfer process during copper ion sensing with sp 2 -TPE-COF NSs.

Multifunctional porous organic polymers as ideal platforms for gas uptake, metal-ions sensing, and cell imaging

“…4b and d), respectively, which is the best performance among porous probes reported previously. 31–38 Pd 2+ , Cr 3+ , Bi 3+ , Co 2+ , Ni 2+ , and Fe 3+ displayed low luminescence intensity for both M-POPs. For example, Pd 2+ , Cr 3+ , Co 2+ , Ni 2+ , and Fe 3+ showed luminescence intensity for M-POP-1 of 5%, 6%, 15%, 20%, and 44%, respectively.…”

“…S11†), which was an excellent performance for POPs used as fluorescence probes previously. 31–38 The efficiency of fluorescence quenching of both M-POPs could be nearly fitted to the Stern–Volmer equation. According to the fluorescence titration of M-POP-1 and M-POP-2 with Cu 2+ , a Stern–Volmer plot was obtained with a K sv value of 3.7 × 10 3 and 2.7 × 10 3 M −1 , respectively (Fig.…”

“…4b and d), respectively, which is the best performance among porous probes reported previously. [31][32][33][34][35][36][37][38] Pd 2+ , Cr 3+ , Bi 3+ , Co 2+ , Ni 2+ , and Fe 3+ displayed…”

“…Due to these advantages, POPs constructed by the Schiff-base reaction have been applied for gas uptake, heterogeneous catalysis, the energy field, and in chemical sensors. 16–39…”

Electrochemical (Bio)Sensors Based on Covalent Organic Frameworks (COFs)

“…Chemical or acid spontaneous exfoliations are receiving a great deal of attention because they cause the COF delamination using chemical energy, reducing the costs for obtaining CONs [49]. Finally, nitrogen delamination consists in the gentle heating of the bulk COF and subsequent addition of liquid nitrogen, which intercalates between the COF layers and produces exfoliation by the thermal expansion in the liquidto-gas phase transition [51]. (ii) The use of bottom-up methods involves the formation of the CONs or the tailor-made COF directly from the monomers.…”