Selective and sensitive detection of lead Pb(II) ions: Au/SWNT nanocomposite embedded MOF 199
Metal organic frameworks (MOFs) are best known for their highly crystalline structures, ultrahigh porosity with considerable surface area and tunable physicochemical properties. The promising architecture of MOFs, where central metal atoms are surrounded by organic ligands secures their prominent candidature for advanced sensor technology. In this work, we have synthesized gold (Au) nanoparticles and single walled carbon nanotube (SWNTs) nanocomposite incorporated copper benzene tricarboxylate (MOF 199) MOF (Au/SWNTs@MOF 199) by solvothermal route. The synthesized Au/SWNTs@ MOF 199 has rigorously characterized with spectroscopic, morphological, structural, electrochemical, thermal, Brunauer Emmett Teller (BET) surface area using N 2 adsorption isotherm methods. The proposed Au/SWNTs@MOF 199 nanocomposite exhibited excellent electrochemical characteristics and sensing performance towards Pb 2+ ions. The calibration plot for the electrochemical response of Au/SWNTs@MOF 199 towards Pb 2+ ions was recorded for the range of 0.1 mM 1 pM R 2 99.58) with a limit of detection of 25 pM/L and a rapid response time of a few seconds with high sensitivity, selectivity, repeatability and reproducibility as determined by error bar diagram. These results indicate the significant potential of Au/SWNTs@MOF 199 nanocomposites as highly sensitive Pb 2+ ion sensor.
Journal of Materials Science