Fluorescence‐based logic gate for sensing of Ca²⁺ and F⁻ ions using PVP crowned chrysene nanoparticles in aqueous medium

Abstract

Polyvinyl pyrrolidone (PVP) crowned chrysene nanoparticles (CHYNPs) were prepared by using a reprecipitation method. Dynamic light scattering (DLS) and scanning electron microscope (SEM) studies indicate that the monodispersed spherical nanoparticles bear a negative charge on their surfaces. The bathochromic spectral shift in the UV-visible and fluorescence spectrum of CHYNPs from chrysene (CHY) in acetone solution supports the J- type aggregation of nanoparticles. The aggregation-induced enhanced emission of CHYNPs at 486 and 522 nm decreases by increasing the concentration of the Ca ion solution. It can display an ON-OFF type fluorescence response with high selectivity towards Ca ions aqueous medium. Furthermore, the in situ generated PVP-CHYNPs-Ca ensemble could recover the quenched fluorescence upon the addition of fluoride anions resulting in an OFF-ON type sensor. The present method has a correlation coefficient R = 0.988 with a detection limit of 1.22 μg/mL for Ca in the aqueous medium. The fluorescence changes of PVP crowned CHYNPs upon the addition of Ca and F can be utilized as an INHIBIT logic gate at the molecular level, using Ca and F chemical inputs and the fluorescence intensity signal as output.

Fluorescence for biological logic gates

“…In these cases, we observe static or contact quenching, which means that the ground state of the complex changes from that of the unaffected fluorophore, but the decay rates are the same. The implication is that the FLT does not change when the molecule is quenched in this manner-the above equation has no changes to it [40,41]. For these systems, FLIM cannot be relevant for logic gate detection.…”

Synthesis, characterization, theoretical investigations and fluorescent sensing behavior of oligomeric azine-based Fe3+Chemosensors

“…Nowadays, the development of highly sensitive and selective fluorescence chemosensors for the detection of various metal ions has gained significant relevance in environmental, medical, and biological applications because agriculture and industrial hasty growth causes excessive atmospheric pollution by introducing heavy metals and transition metals to the environment. 1,2 Moreover, the most abundant and biologically important transition metal is iron. The analysis of iron is much important for understanding the metabolic processes of biochemical cycling.…”

Organic Inorganic Materials Open New Path for Synthesis and Application

“…But the expectations go beyond mechanical strength, thermal and chemical stability; these new materials are also sought for improved optical and electrical properties, luminescence, ionic conductivity, and selectivity, as well as chemical or biochemical activity [1]. Nowadays, in response to the challenge of energy crisis, the immediate imperative is to alternative renewable sources to reduce the emission of carbon dioxide and other harmful substances to our environment, as well as the provision of clean power, solar energy is one of the best promising clean energy to overcome these problems [2].And also the design of fluorescent chemo-sensor with high selectivity and high sensitivity to the detection of various metal ions, have gained remarkable importance in medical and biological applications [3][4][5][6][7],but thesis materials which applied in tow these field have suffering from more problems aggregation effect, compatibility and thermal stability that limits their applications, therefore, how to design well dye-molecular structure; prevent all the problems of the material suffering of it is a big challenge. We select a hybrid material to solve all these problems by OV-POSS, are a class of inorganic compound with well-defined cube-octameric structure with silicalike core surrounded by eight organic corner groups, which make OV-POSS excellent platforms for disbanding of the aggregated platelets., which fabricate our system and enhances the thermal optical limiting, poor compatibility, disaggregation and dielectric properties of organic dyes significantly [8].One of these breeding and promising material connected with the OV-POSS advanced amide due to stability over wide pH intervals (pH 3-11), as well as simple and economical [9],also cyan uric chloride (CC) derivatives have been studied for decade, especially its amino derivatives which advantages of simplicity, high efficiency and excellent selectivity [10].It is an essential organic intermediate of which three chlorine can be replaced by -NH 2 -OH, -SH (or), and -NHR step by step with high yield based on simple thermodynamic control [11].…”