A three-phase copper MOF-graphene-polyaniline composite for effective sensing of ammonia

Sanjeev K Bhardwaj; Girish C Mohanta; Amit L Sharma; Ki-Hyun Kim; Akash Deep

doi:10.1016/j.aca.2018.09.003

A three-phase copper MOF-graphene-polyaniline composite for effective sensing of ammonia

Anal Chim Acta. 2018 Dec 28:1043:89-97. doi: 10.1016/j.aca.2018.09.003. Epub 2018 Sep 4.

Authors

Sanjeev K Bhardwaj¹, Girish C Mohanta¹, Amit L Sharma¹, Ki-Hyun Kim², Akash Deep³

Affiliations

¹ Central Scientific Instruments Organisation (CSIR-CSIO), Sector 30 C, Chandigarh, 160030, India; Academy of Scientific and Innovative Research, AcSIR-CSIO, Sector 30 C, Chandigarh, India.
² Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul, 04763, South Korea. Electronic address: kkim61@hanyang.ac.kr.
³ Central Scientific Instruments Organisation (CSIR-CSIO), Sector 30 C, Chandigarh, 160030, India; Academy of Scientific and Innovative Research, AcSIR-CSIO, Sector 30 C, Chandigarh, India. Electronic address: dr.akashdeep@csio.res.in.

PMID: 30392673
DOI: 10.1016/j.aca.2018.09.003

Abstract

In this work, a three-phase composite material consisting of SiO₂-coated Cu-MOF, single layer graphene, and aniline was synthesized. In the presence of ammonium persulfate as an oxidant, the aniline component of this mixture was polymerized to polyaniline to bridge Cu-MOF and graphene in the composite. Hence, a new sensory material with a highly porous nature (MOF) and superior conduction properties (graphene/polyaniline) was constructed. More specifically, the inclusion of Cu-MOF in the matrix facilitated the acquisition of an electrochemically active sensory material with a high surface area of about 756 m²/g. The potential application of this porous semiconducting material was demonstrated for sensitive detection of ammonia in a linear detection range over 1-100 ppm with a low limit of detection of 0.6 ppm.

Keywords: Ammonia; Composite; Graphene; Metal-organic framework; Polyaniline; Sensor.