Title:Fluorescence Quenching Study of 5-sulphosalicylic Acid Doped
Polyaniline-γ-Fe2O3 Composite for High Energy Material Sensing
(Fe-SPAni)
Volume: 3
Author(s): Shruthy Darley Pattathil, Satish Ashok Ture, Zing Zing Bertrand and Venkataraman Abbaraju*
Affiliation:
- Materials Chemistry Laboratory, Department of Materials Science, Gulbarga University, Kalaburagi, 585106, India
- Department of Chemistry, Gulbarga University, Kalaburagi, 585106, India
Keywords:
Nanocomposite, fluorescence, quenching, stern-volmer, limit of detection, cyclic voltammetry.
Abstract:
Background: Polymeric nanocomposites containing metal oxides are of interest to
researchers because these materials show hybrid properties that are generated from both
components. Due to the control and design of structural properties at the nanoscale scale, they have
specialized properties for a range of applications. Researchers have tried to improve the desirable
characteristics and thus increase their application by reinforcing them with nanoscale materials to
provide them with better properties than conventional micro composites.
Objective: In our present work we have used 5-sulphosalicylic acid doped polyaniline-γ-Fe2O3
composite (Fe-SPAni) to detect explosives using fluorescence quenching method. Along with ease
of synthesis and low cost, Fe-SPAni possesses a variable oxidation state which is important for
trace detection of the analytes.
Methods: We used the fluorophore Fe-SPAni to detect High Energy Materials (HEMs) using the
fluorescence quenching approach, which is still difficult to achieve. UV-V is spectroscopy,
Fourier-transform infrared (FTIR) spectroscopy, and scanning electron microscopy (SEM/EDAX)
were used to determine the molecular structure of the Fe-SPAni composite produced by oxidative
chemical polymerization; CV studies were performed to investigate the electrochemical properties.
HEMs such as dinitrobenzene (DNB), pentaerythritol tetranitrate (PETN), trinitrotoulene (TNT),
1,3,5-trinitroperhydro-1,3,5-triazine (RDX), and hexanitrohexaazaisowurtzitane(CL-20) were used
as quenchers.The fluorescence quenching process was determined using the Stern-Volmer graph.
Results: The Stern-Volmer(S-V) plot and limit of detection (LOD) data showed that PETN had the greatest
results for the quenching constant value (Ksv) (Ksv =1.33 x 106 M-1 and 1.4x 10-6M, respectively).
Conclusion: The research points to Fe-SPAni as a promising contender for sensing explosives.
