ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Hexagonal nanoplatelets of Ni–Mn oxide implanted reduced graphene oxide for high response in humidity sensing

Debabrata Nandi, Sabarish Radoor, Aswathy Jayakumar, Chandni Devi, and Suchart Siengchin

Department of Mechanical and Production Engineering, The Sirindhorn International Thai–German Graduate School of Engineering (TGGS), King Mongkut’s University of Technology North Bangkok, Bangkok, Thailand

E-mail: nandi.debabrata87@gmail.comand

Received: 10 May 2023  Accepted: 9 December 2023

Abstract:

The hydrothermal synthetic approach was used to synthesize unique nanoplatelets of manganese(IV) nickel(II) oxide (NMN) and successively implanted into reduced graphene oxide to develop Ni–Mn oxide implanted reduced graphene oxide (NMNG). The Raman study, X-ray diffraction, transmission electron microscopy, energy dispersive X-ray spectroscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, surface porosity study, etc., were used to explore its structure–property correlation. The humidity sensing performance of NMNG was assessed, and its sensing mechanism was explored. The higher concentration of H⁺ or H₃O⁺ on the surface of NMNG showed higher conductivity and generated higher responses. Notably, RGO introduction can enhance sensor performance up to 100 times. The sensitivity of NMNG was greatly improved surpassing the most efficient humidity sensors. NMNG displayed excellent sensitivity and a fast recovery (5 s). Additionally, NMNG can proficiently sense humidity at a wide range of 8–81 relative humidity (RH)% which reveals its promising performance in support of nanoplatelets structure and highly accessible surface area of RGO.

Keywords: Reduced graphene oxide; Ni–Mn oxide nanoplatelets; Wide humidity sensing range; High sensitivity; Grotthuss mechanism

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-023-03296-z

Chemical Papers 78 (5) 3099–3110 (2024)