We have fabricated ZrO₂ thin films by sol–gel deposition and annealed them at 300, 500 and 700 °C. Reproducible 𝐼-𝑉 curves can be obtained for the device Cu/ZrO₂/ATO which is measured at room temperature (300 K). During the RESET operation, 𝑅_L and 𝑅_H values can be controlled by the RESET voltage. Moreover, the Cu/ZrO₂/ATO device which the ZrO₂ thin film annealed at 300 °C can be measured as resistive switching sweeps at 200, 100 and 50 K. It was found that the ratio of 𝑅_off/𝑅_on reduced when the measured temperature decreased. When the 𝐼-𝑉 measurement temperature decreases, 𝑅_on decreases obviously which is typical for electronic transportation in a Cu metal. It is indicated that the Cu metallic conduction filament has been formed in the ZrO₂ films. Besides, the microstructure by high resolution transmission electrical microscopy (HRTEM) was also investigated.

Ethylene glycol (EG)-based hybrid nanofluids containing graphene oxide–silver nanosheets (GO–Ag) were simply prepared without using any surfactant. The graphene oxide–silver composites were characterized using X-raydiffraction analysis, transmission electron microscope, infrared and UV–visible spectroscopy. The stability of GO–Ag nanofluids was estimated by UV–visible spectroscopy. The GO–Ag/EG hybrid nanofluids has good stability withoutsignificant sedimentation for 60 days. A few thermophysical properties of GO–Ag/EG nanofluids with 0.1, 0.2 and 0.3 wt% nanosheets were analysed experimentally at different temperatures ranging from 20 to 50$^{\circ}$C.