Multifunctional Nanohybrid of Alumina and Indium Oxide Prepared Using the Atomic Layer Deposition Technique

Developing new transparent conducting materials, especially those having flexibility, is of great interest for electronic applications. Here, our study on using the ozone-assisted atomic layer deposition (ALD) technique at a low temperature of 200 degrees C for making an ultrathin, transparent, flexible, and highly electro-conducting nanohybrid of indium and aluminum oxides is introduced. Through various characterizations, measurements, and density functional theory-based calculations, excellent electrical conductivity (similar to 950 S cm(-1)), transparency (95% in the visible region), and flexibility (bendable angle of 130 degrees for 10 000 cycles) of our nanohybrid oxide thin film with a total layer thickness below 15 nm (2-4 nm for alumina and 10 nm for indium oxide) have been revealed and discussed. Besides, potential sensing applications of our oxide films on a flexible substrate have been demonstrated, such as strain sensors, temperature sensors (25-100 degrees C, resolution of 0.1 degrees C), and NO2 gas sensors (0.35-3.5 ppm, optimum operation at 65-75 degrees C). With the great potential in not only transparent conducting oxide but also sensing applications, our multifunctional nanohybrid prepared using a simple ozone-assisted ALD route opens more room for the applicability of transparent and flexible electronics.

Automated summary

The study introduces a successful method of using ozone-assisted atomic layer deposition to create a nanohybrid oxide thin film with transparency, electrical conductivity, and flexibility. The film shows great potential for sensing applications, such as strain sensors, temperature sensors, and NO2 gas sensors.