BGO/AlFu MOF core shell nano-composite based bromide ion-selective electrode

In the present investigation, a novel core shell nano-composite based on boron doped graphene oxide-aluminium fumarate metal organic framework (BGO/AlFu MOF) has been reported for fabrication of bromide ion selective electrode (ISE). The nano-composite was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), high resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS). The core-shell structure of the nano-composite was revealed by HRTEM images, with average thickness of the shell being 13.2 nm. The highly crystalline nature of nano-composite was confirmed by X-ray diffraction and selected area electron diffraction (SAED) pattern. The UV-vis spectroscopy and distribution studies established that the synthesised nano-composite was selective for bromide ions. The nanocomposite was employed to fabricate an ion selective electrode which exhibited a near Nernstian response for bromide ions in the concentration range 1 × 10−7–1 × 10−1 M with a response time of 13 s. The average slope of the calibration curve was observed to be 54.53 ± 0.15 mV per decade change in concentration, with 7.1 × 10−8 M as the limit of detection (LOD). Furthermore, the electrode showed better selectivity towards bromide ions in comparison to other anions.