Porous Clay Heterostructures (PCHs) were prepared by the surfactant-directed assembly of silica source (tetraethylorthosilicate-TEOS) and sodium-bentonite (Na-BTN) clay. These PCHs were subsequently modified to an organic-inorganic hybrid material by the co-condensation reaction of TEOS with (3-mercaptopropyl trimethoxy silane (MPTMS) in 1:1, 2:1, and 4:1 molar ratios of MPTMS to TEOS to obtain conductive porous clays, here referred to as modified MPPCHs. Various weight percentage of MPPCHs at 1, 3, and 5 wt% were blended with polypropylene (PP) and fabricated into the PP/modified MPPCHs nanocomposite films. Analysis revealed that the surface areas of modified MPPCHs increased significantly from Na-BTN; however, the higher MPTMS contents resulted in less porous surface areas. An ethylene adsorption study showed that modified MPPCHs exhibited higher adsorption efficiency of ethylene gas than that of Na-BTN due to the non-polar property of the modified functional groups. Subsequently, the electrical conductivity of the modified MPPCHs with various contents of thiol group was investigated to evaluate potential use in ethylene scavenger/sensor applications.