MoS 2 ‐Polyaniline Based Flexible Electrochemical Biosensor: Toward pH Monitoring in Human Sweat

Sudipta Choudhury, Deepak Deepak, Gourav Bhattacharya, James McLaughlign, Susanta Sinha Roy

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)
57 Downloads (Pure)


Wearable pH sensors for sweat analysis have garnered significant scientific attention for the detection of early signs of many physiological diseases. In this study, a MoS2‐polyaniline (PANI) modified screen‐printed carbon electrode (SPCE) is fabricated and used as a sweat biosensor. The exfoliated MoS2 nanosheets are drop casted over an SPCE and are functionalized by a conducting polymer, polyaniline (PANI) via the electropolymerization technique. The as‐fabricated biosensor exhibits high super‐Nernstian sensitivity of −70.4 ± 1.7 mV pH−1 in the linear range of pH 4 to 8 of 0.1 m standard phosphate buffer solution (PBS), with outstanding reproducibility. The sensor exhibits excellent selectivity against the common sweat ions including Na+, Cl−, K+, and NH4+ with tremendous long‐term stability over 180 min from pH 4 to 6. The enhanced active surface area and better electrical conductivity as a consequence of the synergistic effect between MoS2 and PANI are correlated with the boosted performance of the as‐produced biosensor. The feasibility of the sensor is further examined using an artificial sweat specimen and the successful detection confirms the potential of the biosensor for a real‐time noninvasive, skin attachable, and flexible wearable pH sensor.
Original languageEnglish
Article number2300007
Pages (from-to)1-12
Number of pages12
JournalMacromolecular Materials and Engineering
Issue number8
Early online date17 Apr 2023
Publication statusPublished (in print/issue) - 31 Aug 2023

Bibliographical note

Funding Information:
S.C. and D.D. are indebted to Shiv Nadar Institute of Eminence for providing Ph.D. scholarships.

Publisher Copyright:
© 2023 The Authors. Macromolecular Materials and Engineering published by Wiley-VCH GmbH.


  • artificial sweat
  • electrochemical biosensors
  • pH sensors
  • screen printed carbon electrodes
  • wearable sensors


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