Insight on Fractal Assessment Strategies for Tin Dioxide Thin Films

Abstract

Tin oxide is a unique material of widespread technological applications, particularly in the field of environmental functional materials. New strategies of fractal assessment for tin dioxide thin films formed at different substrate temperatures are of fundamental importance in the development of microdevices, such as gas sensors for the detection of environmental pollutants. Here, tin dioxide thin films with interesting fractal features were successfully prepared by pulsed laser deposition techniques under different substrate temperatures. Fractal method has been first applied to the evaluation of this material. The measurements of carbon monoxide gas sensitivity confirmed that the gas sensing behavior is sensitively dependent on fractal dimensions, fractal densities, and average sizes of the fractal clusters. The random tunneling junction network mechanism was proposed to provide a rational explanation for this gas sensing behavior. The formation process of tin dioxide nanocrystals and fractal clusters could be reasonably described by a novel model.

Transparent conducting Sb-doped SnO2 thin films grown by pulsed laser deposition

“…Doped tin oxide (SnO 2 ) thin films have been widely used as transparent electrodes in various fields such as solar cells, optoelectronic devices, flat panel displays, heat mirrors, and gas sensor owing to their large electrical conductivity and high optical transmittance in the visible region, and high infrared reflectance [1][2][3][4][5][6]. Many dopants, such as antimony (Sb) [7], arsenic (As) [8], phosphorus (P) [9], molybdenum (Mo) [10], fluorine (F) [11] and chlorine (Cl) [12], have been studied to improve the electrical and optical properties of SnO 2 thin films.…”

Effect of substrate temperature on the properties of reactively sputtered TiN/NbN multilayers

“…Increase in substrate temperature to 400 °C causes the TiN/NbN multilayered coatings to exhibit a strong orientation along (111)/(101) and other peaks (200)/(103), (220)/(106), and (222)/(108) as well. Using the Scherrer`s formula [27], the grain size of TiN/NbN multilayered coatings are evaluated for different substrate temperatures. The variation of grain size with substrate temperature is shown in figure 3.…”

Graphene–metal oxide nanohybrids for toxic gas sensor: A review

“…have widely been explored for sensing applications, mainly due to their large specific surface area, excellent mechanical flexibility and good chemical stability. [34][35][36][37][38][39][40][41] However, these sensors hold an obvious disadvantage of high operating temperature, resulting in high power consumption, which in turn adversely affects the integration and long-term stability. Moreover, high working temperatures may bring about safety issues for…”