Enhanced optical and electrical gas sensing response of sol–gel based NiO–Au and ZnO–Au nanostructured thin films

Abstract Recently, the rise of two dimensional amorphous nanostructured thin films have ignited a big interest because of their intriguingly isotropic structural and physical properties leading to potential applications in the nano-optoelectronics. However, according to literature, most of optoelectronic properties are investigated on chalcogenides related heterostructures. This has motivated the present work aiming to provide a new platform for the fabrication, examination of the properties and the applications of 2D nanostructured thin films based on epoxy/silicone blend. Thin films of Epoxy/Silicone loaded with nitrogen doped carbon nanotubes (N-CNTs) were prepared by sol-gel method and deposited on Indium Tin Oxide (ITO) glass substrates at room temperature. Further examination of optical properties aimed the investigation of optical pseudo-gap and Urbach energy and enabled the determination of processed films thickness based on Manifacier and Swanepol method. The results indicated that the unloaded thin films have a direct optical transition with a value of 3.61 eV followed by noticeable shift towards narrowing gaps depending on the loading rate. Urbach's energy is 0.19 eV for the unloaded thin films, and varies from 0.43 to 1.33 eV for the loaded thin films with increasing the rate of N-CNTs. It is inversely variable with the optical pseudo-gap. Finally, Epoxy/Silicone loaded with N-CNTs nanocomposites films can be developed as active layers with specific optical characteristics, giving the possibility to be used in electro-optical applications.

Download Full-text

Effect of Zn content on the structural, optical, electrical and supercapacitive properties of sol–gel derived ZnCo2O4 nanostructured thin films

Journal of Materials Science Materials in Electronics ◽

10.1007/s10854-016-4535-0 ◽

2016 ◽

Vol 27 (6) ◽

pp. 6096-6107 ◽

Cited By ~ 10

Author(s):

H. Behzad ◽

F. E. Ghodsi

Keyword(s):

Thin Films ◽

Sol Gel ◽

Nanostructured Thin Films ◽

Zn Content

Download Full-text

Synthesis, Fabrication and Characterization of ZnO-Based Thin Films Prepared by Sol–Gel Process and H2 Gas Sensing Performance

Journal of Materials Engineering and Performance ◽

10.1007/s11665-018-3284-z ◽

2018 ◽

Vol 27 (6) ◽

pp. 2701-2707 ◽

Cited By ~ 8

Author(s):

Anup Dey ◽

Subhashis Roy ◽

Subir Kumar Sarkar

Keyword(s):

Thin Films ◽

Gas Sensing ◽

Sol Gel ◽

Sol Gel Process ◽

Fabrication And Characterization ◽

Sensing Performance

Download Full-text

Synthesis, Properties, and Applications of Special Substrates Coated by Titanium Dioxide Nanostructured Thin Films via Sol-Gel Process

Advanced Methods and Applications in Chemoinformatics ◽

10.4018/978-1-60960-860-6.ch012 ◽

2011 ◽

pp. 246-279

Author(s):

Hamid Dadvar ◽

Farhad E. Ghodsi ◽

Saeed Dadvar

Keyword(s):

Thin Films ◽

Titanium Dioxide ◽

Sol Gel ◽

Precursor Solution ◽

Tio2 Thin Films ◽

Simple Method ◽

Nanostructured Thin Films ◽

Precursor Material ◽

Synthesis Properties ◽

Antibacterial Surfaces

In this chapter, the sol-gel made titanium dioxide nanostructured thin films deposited on special substrates such as glasses, mica, steels, textiles, fibers, and other organic/inorganic substrates were reviewed. Through this review, several distinctive properties such as optical, electrical, photocatalytic, morphological, and mechanical properties of TiO2 nanostructured thin films were described. Also, a wide range of practical application of TiO2 nanostructured thin films such as dye-sensitised solar cells, optical coatings, humidity and gas sensors, selfcleaning, dielectric, and antibacterial surfaces were discussed in details. Dip and spin coating techniques were demonstrated as suitable methods for deposition of thin films. It has been shown that properties of such films can be affected by type of coating technique, stabilizer, precursor material, solvents, pH and viscosity of precursor solution, aging, and etc. Finally, Successive Interference Fringes Method (SIFM) was presented as a simple method for the determination of optical constants and thickness of TiO2 thin films from single transmission measurements.

Download Full-text