The current work describes the pyrolysis of zinc acetylacetonate carried out at 700 °C in a sealed quartz tube underneath inert ambient situations. The ensuing carbonaceous powder materials was characterised by XRD and Raman evaluation, electron microscopy, X-ray photoelectron spectroscopy, and elemental evaluation. These analyses reveal that nanometre-sized hexagonal wurtzite ZnO is embedded in graphitic carbon and graphite oxide, forming a nanocomposite, designated ZnO/C/GO. A pellet of ZnO/C/GO was examined as a conductometric gasoline sensor for detecting hydrogen sulphide (H2S). The composite reveals a fast and vital response of 220% at 150 °C to five ppm of H2S gasoline, with response and restoration time of 20 s and 30 s, respectively. The detection restrict is discovered to be 250 ppb of H2S, with good selectivity over SO2, NO2, CHfour and ammonia. The novel strategy to synthesise a carbonaceous nanocomposite, its sensitivity to H2S at a comparatively low temperature (implying low energy consumption), and its selectivity, promise an economical carbonaceous oxide composite-based sensor for H2S at ppm concentrations.