Resistive Switching Phenomenon Observed in Self-Assembled Films of Flame-Formed Carbon-TiO<sub>2</sub> Nanoparticles

oleh: Mario Commodo, Gianluigi De Falco, Ettore Sarnelli, Marcello Campajola, Alberto Aloisio, Andrea D’Anna, Patrizia Minutolo

Format: Article
Diterbitkan: MDPI AG 2021-08-01

Deskripsi

Nanostructured films of carbon and TiO<sub>2</sub> nanoparticles have been produced by means of a simple two-step procedure based on flame synthesis and thermophoretic deposition. At first, a granular carbon film is produced on silicon substrates by the self-assembling of thermophoretically sampled carbon nanoparticles (CNPs) with diameters of the order of 15 nm. Then, the composite film is obtained by the subsequent thermophoretic deposition of smaller TiO<sub>2</sub> nanoparticles (diameters of the order of 2.5 nm), which deposit on the surface and intercalate between the carbon grains by diffusion within the pores. A bipolar resistive switching behavior is observed in the composite film of CNP-TiO<sub>2</sub>. A pinched hysteresis loop is measured with SET and RESET between low resistance and high resistance states occurring for the electric field of 1.35 × 10<sup>4</sup> V/cm and 1.5 × 10<sup>4</sup> V/cm, respectively. CNP-TiO<sub>2</sub> film produced by flame synthesis is initially in the low resistive state and it does not require an electroforming step. The resistance switching phenomenon is attributed to the formation/rupture of conductive filaments through space charge mechanism in the TiO<sub>2</sub> nanoparticles, which facilitate/hinder the electrical conduction between carbon grains. Our findings demonstrate that films made of flame-formed CNP-TiO<sub>2</sub> nanoparticles are promising candidates for resistive switching components.