Nitrogen-Sulfur Co-Doped Reduced Graphene Oxide-Nickel Oxide Nanoparticle Composites for Electromagnetic Interference Shielding

Author(s)

Kumar, Rajesh ^[1] ; Macedo, Jr., Wagner C. ^[2] ; Singh, Rajesh K. ^[3] ; Tiwari, Vidhu S. ^[4] ; Constantino, Carlos J. L. ^[2] ; Matsuda, Atsunori ^[1] ; Moshkalev, Stanislav A. ^[5]

Affiliation

^[1] Toyohashi Univ Technol, Dept Elect & Elect Informat Engn, 1-1 Hibarigaoka, Tempaku Cho, Toyohashi, Aichi 4418580 - Japan

^[2] Sao Paulo State Univ, Dept Phys, Fac Sci & Technol, BR-19060900 Presidente Prudente, SP - Brazil

^[3] CUHP, Sch Phys & Mat Sci, Dharamshala 176215, Himachal Prades - India

^[4] SRM Univ, Delhi NCR, Dept Phys, Sonepat 131029, Haryana - India

^[5] Univ Campinas UNICAMP, Ctr Semicond Components & Nanotechnol CCS Nano, BR-13083870 Campinas, SP - Brazil

• Document type: Journal article
• Source: ACS APPLIED NANO MATERIALS; v. 2, n. 7, p. 4626-4636, JUL 2019.
• Web of Science Citations: 1

Abstract

The present work demonstrates the microwave -assisted synthesis of two different structural morphologies containing nickel oxide nanoparticles (NiO NPs) embedded in nitrogen (N) and sulfur (5) co-doped reduced graphene oxide (NS-rGO) nanosheets. The synthesized NiO anchored on NS-rGO nanosheets (NS-rGO-NiO composites) and NiO covered by NS-rGO nanosheets (NS-rGO:NiO composites) were used as an application in electromagnetic interference (EMI) shielding effectiveness (SE). The EMI SE studies reveal that NS-rGO:NiO composites show improved performance as compared to NS-rGO-NiO composites. In NS-rGO:NiO composites, the covered surface of NiO NPs by conducting NS-rGO nanosheets helps to improve the EMI SE application. The synthesized composite materials were extensively characterized using various techniques including scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, thermogravimetric analysis, Raman spectroscopy, and X-ray photoelectron spectroscopy. Binding energy of N/S element in rGO nanosheets were analyzed by XPS and it is confirmed that the N atoms were present in three states in carbon skeleton of NS-rGO nanosheets as pyridinic, pyrrolic, and graphitic states; however, S atoms were present in single state as C S C configuration. The as synthesized NS-rGO:NiO composites reveal good performance for EMI applications and demonstrate the SE value of more than-,21 dB at thickness of 1.1 mm film of NS-rGO:NiO composites in microwave X-band range (8.2-12.4 GHz). (AU)

• FAPESP's process: 13/14262-7 - Nanostructured films from biologically-relevant materials
• Grantee: Osvaldo Novais de Oliveira Junior
• Support Opportunities: Research Projects - Thematic Grants