Various MOFs as TMA-M derived from Ba(II), Cd(II), Pb(II), and Zn(II) as metal ions (M) and trimesic acid (TMA, benzene-1,3,5-tricarboxylic acid) as organic linker were prepared for the determination of their susceptibility against ammonia (NH3). FT-IR spectroscopy, thermogravimetric analysis, SEM images, BET surface area and porosity measurements were done. Furthermore, the room temperature conductivity of the synthesized TMA-M MOFs were investigated against room temperature NH3 vapor. The room temperature conductivities were determined 8.3E10(-11), 7.6E10(-11) and 1.7E10(-10) S cm(-1) for TMA-Zn, TMA-Cd and TMA-Pb, respectively. Among the TMA-M MOFs, it was observed that TMA-Zn MOF showed relatively higher response to NH3 vapor, where it's conductivity was increased about 50 times in comparison to the conductivity measurement of TMA-Zn MOF in the absence of NH3. Furthermore, a more detailed conductivity analysis of this response was investigated for TMA-Zn MOF as a function of various NH3 exposure times at room temperature. (C) 2015 Elsevier B.V. All rights reserved.