In this work, active and stable catalyst for the dehydrogenation reaction of dimethylamine borane (DMAB) in solvent-free medium at room temperature has been prepared. The method is based on preparing in-situ monodispersed gold nanoparticles (AuNPs) by reducing the one dimensional polymer of gold(I):6-thioguanosine hydrogel by DMAB; which acts as reducing and stabilizing agent. Monitoring time-dependent to build the surface plasmon resonance (SPR) band for the formed AuNPs was carried out by performing a kinetic study using UV-Vis spectroscopy. Transmission electron microscopy (TEM) and atomic force microscopy (AFM) techniques were used to investigate the morphology of the AuNPs that obtained after reducing the hydrogel. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.