synthesis of tio2 nanoparticle and its application to graphite composite electrode for hydroxylamine oxidation

in this work, sol-gel method was used tosynthesize titanium dioxide nanoparticles (tio2). the tio2nanoparticles was characterized by scanning electron microscopy (sem), x-ray diffraction (xrd) and bet technique.the tio2 and coumarin derivative (7-(1,3-dithiolan-2-yl)-9, 10-dihydroxy-6h-benzofuro [3,2-c] chromen-6-on) were incorporated in a graphite composite electrode. the resulting modified electrode displayed a good electrocatalytic activity for the oxidation of hydroxylamine, which leads to a reduction in its overpotential by more than 520 mv. differential pulse voltammetry (dpv) of hydroxylamine at the modified electrode exhibited a linear dynamic range (between 0.5 and 500.0 µm) with a detection limit (3σ) of 0.133 μm. the high sensitivity, ease of fabrication and low cost of this modified electrode for the detection of hydroxylamine demonstrate its potential sensing applications.