Naked-eye detection of Pd2+ ion using a highly selective fluorescent heterocyclic probe by “turn-off” response and in-vitro live cell imaging

Microwave-Assisted Synthesis of Functionalized Carbon Nanospheres Using Banana Peels: pH-Dependent Synthesis, Characterization, and Selective Sensing Applications

“…The survey spectrum depicted the presence of peaks at 532.08, 285.08, and 399.08, which correspond to O 1s, N 1s, and C 1s, respectively (Figure ). , The deconvolution of C 1s spectra is shown in Figure b, which suggests the presence of 5 peaks at 283.72, 284.52, 285.30,286.20, and 287.65, which corresponds to CH 3 CO, C–C/CC, C–N/C–O, CN/CO, and HO–CO, respectively. , Figure c shows the deconvolution of N 1s spectra, which indicates the presence of 3 different peaks at 398.14, 399.68, and 401.05, which signifies the presence of C–N–C, C–N–H, and (C 3 )–N bond, respectively. − The high-resolution spectra of the O 1s scan can be seen in Figure d and after deconvolution, it has 4 peaks at 530.56, 531.52, 532.56, and 533.42, which represent the functional groups as CO, C–OH, C–O–C, and HO–CO, respectively. − We also determined the elemental analysis of C, N, and O, which comes out to be 59.58, 9.14, and 31.28%, respectively. The presence of these highly electronegative groups on CNS may be attributed to the binding of a highly positive divalent ion of Cu 2+ making it a potential sensor.…”

“…This distortion suggests that the synthesized CNSs operate as a "turn-off" fluorescence sensor for Cu 2+ ions due to the static quenching phenomenon. 70,71 In conclusion, the synthesized CNS, characterized by its negative surface charge and the interaction potential of its diverse functional groups, serves as an effective 'turn-off' fluorescence sensor for Cu 2+ ions due to the CHEQ (chelation-enhanced quenching) effect. The elucidation of static quenching mechanisms through fluorescence titration, Stern−Volmer plots, and lifetime studies enhances our understanding of the intricate For the determination of detection and quantification limits, a linear plot showcasing the relationship between the Cu 2+ concentration and fluorescence intensity was obtained.…”

Nitrogen-doped graphene quantum dot-based portable fluorescent sensors for the sensitive detection of Fe3+ and ATP with logic gate operation

“…S7, ESI†), which confirmed the occurrence of static quenching. 46 Furthermore, the fluorescence quenching mechanism of N-GQDs can also be evaluated using the Stern–Volmer equation (eqn (2) and (3)). here, F and F 0 represent the intensity of fluorescence in the absence and presence of Fe 3+ , [C] is the equilibrium concentration of the quencher, and K sv is the Stern–Volmer's quenching constant.…”

“…S7, ESI †), which confirmed the occurrence of static quenching. 46 Furthermore, the fluorescence quenching mechanism of N-GQDs can also be evaluated using the Stern-Volmer equation (eqn ( 2) and ( 3)).…”

A new chromone-based fluorescent probe for ratiometric detection of Pd2+

“…[34][35][36] As an efficient fluorescence quencher, Pd 2+ could also be detected by using strong fluorescence probes by a fluorescence quenching mechanism. [37][38][39] However, fluorescence ''turn-on'' chemosensors are considered to be more efficient. Recently, several fluorescence enhanced probes have been reported for the detection of Pd 2+ .…”