Synthesis, characterization and liquefied petroleum gas sensing of cobalt acetylenedicarboxylate and its polymer

The synthesis of cobalt acetylenedicarboxylate (fCo2) and polymerized cobalt acetylenedicarboxylate (hCo2) using acetylenedicarboxylic acid (fADC) has been reported. Surface morphologies were analyzed using scanning electron microscope (SEM) and transmission electron microscope (TEM). The UV–vis absorption and infrared spectroscopies were used for optical characterization. Structural properties were studied using X-ray diffractometer with scattering vector analysis. The minimum particle size was found to be 10 nm for polymerized acetylenedicarboxylate and confirmed through the TEM analysis. Thermal properties were investigated using thermal gravimetric analysis (TGA) and differential scanning calorimeter (DSC). Further, the LPG sensing properties of the materials were investigated at room temperature (25 °C). Polymerized acetylenedicarboxylate shows larger variation in resistance in comparison to acetylenedicarboxylate and acetylenedicarboxylic acid both. In addition, the possible sensing mechanism of the interactions of LPG on the surface of the materials has been discussed. The maximum sensor response, small response time and long-term stability demonstrates that the fabricated sensor (hCo2) is challenging for the detection of LPG.