▎ 摘　　要

Graphene oxide nanocomposites were synthesized using two different approaches, a physical and a covalent synthesis approach. The techniques adopted for these approaches are in situ method and a two-step wet chemical synthesis method respectively. In this study, we have used both approaches to mitigate overall effect of synthesis procedure on the nanocomposite itself and its potential application. This is of particular interest in order to have a nanomaterial formulation that delivers on its promise of homogeneity, uniformity, usage and biocompatibility. Nanocomposites were characterized using XRD, SEM and FTIR and tested for their potential application in colorimetric detection of H2O2. These nanocomposites are first of their synthetic kinds to be tested for their peroxidase like potential. It is seen that physical nanocomposite provides better colloidal stability whereas covalent nanocomposite provides control over reaction chemistry thereby increasing reproducibility of the system. However, physical nanocomposite is synthesized using robust and facile method with better colorimetric detection limit for H2O2 (LoD 0.3 mu M).