Effect of the Nickel and Temperature on the Electrical Properties of C-SiO2-Ni Nanocomposites

• Published in: Brazilian journal of physics Vol. 52; no. 4
• Main Authors: Gouadria, S., Omri, K., Choukaier, Dhouha
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-08-2022; Springer Nature B.V
• Subjects: Atmospheric models; Atomic properties; Condensed Matter; Conduction model; Differential thermal analysis; Electrical properties; Heat treatment; Hopping conduction; Inert atmospheres; Low temperature; Nanocomposites; Nickel; Physics; Physics and Astronomy; Pyrolysis; Room temperature; Silicon dioxide; Sol-gel processes; C-SiO; Ni nanocomposites; Ac conductance; Negative differential resistance; Sol gel
• ISSN: 0103-9733; 1678-4448
• DOI: 10.1007/s13538-022-01140-5

The sol–gel method was chosen to synthesize C-SiO
2
/Ni nanocomposites. Silica nano-fillers were incorporated into a carbon based on resorcinol–formaldehyde (RF), doped with 5% by mass of atomic nickel. During the preparation process, they were subjected to a heat treatment of different pyrolysis temperatures and under an inert atmosphere for 2 h. The X- ray diffractogram presented by
XRD
of the samples, treated at low temperatures, indicated the presence of characteristic lines of metallic nickel. FTIR analysis showed the presence of a main band located at about 1050 cm
−1
, which corresponded to the vibrations of Si–O-Si. From electrical characterizations, the C-SiO
2
-Ni5%-650 sample has a negative differential resistance behavior (NDR) at low measurement temperatures. According to the I-V characterization, the C-SiO
2
-Ni
5%
-625 °C nanocomposite revealed the NDR behavior at room temperature. The conduction mechanism was fitted by two models: the hopping conduction model for the nanocomposite, treated at 650 °C, and the small polaron model for the composite treated at 675 °C.