Selective and sensitive detection of lead Pb(II) ions: Au/SWNT nanocomposite-embedded MOF-199
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Selective and sensitive detection of lead Pb(II) ions: Au/ SWNT nanocomposite-embedded MOF-199 Gajanan A. Bodkhe1, Bhavna S. Hedau1, Megha A. Deshmukh1, Harshada K. Patil1, Sumedh M. Shirsat2, Devdatta M. Phase3, Krishan K. Pandey4, and Mahendra D. Shirsat1,*
1
RUSA Center for Advanced Sensor Technology, Department of Physics, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad, MS 431 004, India 2 Department of Electronics and Telecommunication Engineering, Jawaharlal Nehru Engineering College, Aurangabad, MS 431 001, India 3 UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452001, India 4 High Pressure and Synchrotron Radiation Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
Received: 13 June 2020
ABSTRACT
Accepted: 22 August 2020
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 N2 adsorption isotherm methods. The proposed Au/SWNTs@MOF199 nanocomposite exhibited excellent electrochemical characteristics and sensing performance towards Pb2? ions. The calibration plot for the electrochemical response of Au/SWNTs@MOF-199 towards Pb2? ions was recorded for the range of 0.1 mM–1 pM (R2 = 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 Pb2? ion sensor.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
Handling Editor: Chris Cornelius. Gajanan A. Bodkhe and Bhavna S. Hedau have contributed equally.
Address correspondence to E-mail: [email protected]
https://doi.org/10.1007/s10853-020-05285-z
J Mater Sci
Introduction Continuous and rigorous evolution of environmental parameters is the major need of today’s era. Evolution involves growth in all aspects, viz. industrial, economic and environmental and so on, which in turn brings some backlogs too as a reward. Drastic environmental changes are of major concern which is by-product of industrial growth [1, 2]. Among all, heavy metal ions [3] are most dangerous pollutants causing sever threat to humans as well as atmosphere as a whole. The most crucial is that as they are not biodegradable, they remain there for decades once they are entered into environm
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