title: Ultrasensitive electrospun fluorescent nanofibrous membrane for rapid visual colorimetric detection of H2O2.
abstract: We report herein a flexible fluorescent nanofibrous membrane (FNFM) prepared by decorating the gold nanocluster (AuNC) on electrospun polysulfone nanofibrous membrane for rapid visual colorimetric detection of H2O2. The provision of AuNC coupled to NFM has proven to be advantageous for facile and quick visualization of the obtained results, permitting instant, selective, and on-site detection. We strongly suggest that the fast response time is ascribed to the enhanced probabilities of interaction with AuNC located at the surface of NF. It has been observed that the color change from red to blue is dependent on the concentration, which is exclusively selective for hydrogen peroxide. The detection limit has been found to be 500 nM using confocal laser scanning microscope (CLSM), visually recognizable with good accuracy and stability. A systematic comparison was performed between the sensing performance of FNFM and AuNC solution. The underlying sensing mechanism is demonstrated using UV spectra, transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The corresponding disappearance of the characteristic emissions of gold nanoclusters and the emergence of a localized surface plasmon resonance (LSPR) band, stressing this unique characteristic of gold nanoparticles. Hence, it is evident that the conversion of nanoparticles from nanoclusters has taken place in the presence of H2O2. Our work here has paved a new path for the detection of bioanalytes, highlighting the merits of rapid readout, sensitivity, and user-friendliness.
authors.affiliation: UNAM-National Nanotechnology Research Center, Bilkent University, 06800, Ankara, Turkey. senthamizhan@unam.bilkent.edu.tr.
authors.forename: Anitha
authors.initials: A
authors.lastname: Senthamizhan
authors.affiliation: UNAM-National Nanotechnology Research Center, Bilkent University, 06800, Ankara, Turkey.
authors.forename: Brabu
authors.initials: B
authors.lastname: Balusamy
authors.affiliation: UNAM-National Nanotechnology Research Center, Bilkent University, 06800, Ankara, Turkey.|Institute of Materials Science and Nanotechnology, Bilkent University, 06800, Ankara, Turkey.
authors.forename: Zeynep
authors.initials: Z
authors.lastname: Aytac
authors.affiliation: UNAM-National Nanotechnology Research Center, Bilkent University, 06800, Ankara, Turkey. tamer@unam.bilkent.edu.tr.|Institute of Materials Science and Nanotechnology, Bilkent University, 06800, Ankara, Turkey. tamer@unam.bilkent.edu.tr.
authors.forename: Tamer
authors.initials: T
authors.lastname: Uyar
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation*; D055664:Electrochemical Techniques / Q000295:instrumentation*; D006046:Gold / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000032:analysis*; D008567:Membranes, Artificial; D053768:Metal Nanoparticles / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D057139:Nanofibers / Q000737:chemistry*; D056951:Photoelectron Spectroscopy; D017550:Spectroscopy, Fourier Transform Infrared; D020349:Surface Plasmon Resonance
chemical_list: D008567:Membranes, Artificial; D006046:Gold; D006861:Hydrogen Peroxide
keywords: Electrospinning; Fluorescence; Gold nanocluster; Hydrogen peroxide; Nanofiber; Sensor