title: 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 Ca2+ion solution. It can display an ON-OFF type fluorescence response with high selectivity towards Ca2+ions aqueous medium. Furthermore, the in situ generated PVP-CHYNPs-Ca2+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 R2= 0.988 with a detection limit of 1.22 μg/mL for Ca2+in the aqueous medium. The fluorescence changes of PVP crowned CHYNPs upon the addition of Ca2+and F-can be utilized as an INHIBIT logic gate at the molecular level, using Ca2+and F-chemical inputs and the fluorescence intensity signal as output.
authors.affiliation: Fluorescence Spectroscopy Laboratory, Department of Chemistry, Shivaji University Kolhapur, Maharashtra, India.
authors.forename: Prasad G
authors.initials: PG
authors.lastname: Mahajan
authors.affiliation: Fluorescence Spectroscopy Laboratory, Department of Chemistry, Shivaji University Kolhapur, Maharashtra, India.
authors.forename: G B
authors.initials: GB
authors.lastname: Kolekar
authors.affiliation: Fluorescence Spectroscopy Laboratory, Department of Chemistry, Shivaji University Kolhapur, Maharashtra, India.
authors.forename: Shivajirao R
authors.initials: SR
authors.lastname: Patil
mesh_terms: D000838:Anions / Q000737:chemistry; D002118:Calcium / Q000032:analysis*; D002911:Chrysenes / Q000737:chemistry*; D000067493:Dynamic Light Scattering; D005459:Fluorides / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000032:analysis*; D049408:Luminescent Agents / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D053758:Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D011205:Povidone / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet; D014867:Water
chemical_list: D000838:Anions; D002911:Chrysenes; D049408:Luminescent Agents; D014867:Water; C031180:chrysene; D007501:Iron; D011205:Povidone; D005459:Fluorides; D002118:Calcium
keywords: Ca2+ ion; F− ion, logic gates; OFF-ON fluorescence sensing; chrysene nanoparticles