Synthesis and Humidity Sensing Properties of Sn-Doped Nano-TiO2

Abstract

Nanostructured Sn-doped TiO 2 have been prepared by ball milling using SnO 2 and TiO 2 as raw materials. The as-prepared powders are characterized by XRD, SEMs and EDAX to identify the structural phases, surface morphology, and composition of the materials. The materials are prepared with the addition of tin of different molar ratios (0, 0.05, 0.10, 0.15, 0.20, 0.25, and 1.0) to TiO 2 and sintered at 800• C for 3 h. They are subjected to dc resistance measurements as a function of relative humidity (RH) in the range of 30%-97% in a self-designed humidity chamber, and the results revealed that the sensitivity factor increased with an increase in tin molar ratio. Among them, TiO 2 -20 wt% of SnO 2 possessed the highest humidity sensitivity, while the pure TiO 2 and SnO 2 composite possessed a low sensitivity.

Chemical Sensor Platform for Non-Invasive Monitoring of Activity and Dehydration

“…The difference between diameters of lower and upper part can be explained by growth of titanium oxide inside of the barrier layer of alumina cells and inside the free space of pores. Inside the alumina barrier layer during transport of Ti and Al ions mixing of titanium oxide with alumina takes place [ 37 ] and only small channels (about 10 nm) in the center of alumina barrier layer have more pure TiO 2 material. After selective removing of the porous alumina layer the mixed part of TiO 2 is removed simultaneously with the alumina leaving the small diameter lower part of the nanopillars ( Figure 6b ).…”

“…The advancing development of science in the area of nanoelectronics can significantly reduce the size of such sensors and their power consumption, which opens the possibility of using them as in-situ or wearable sensors, e.g., for human biological processes monitoring [ 23 – 25 ] close to the skin or vapors, humidity and gases measuring in mobile applications. One of the more promising materials for humidity sensor applications is micro- and nanostructured titanium oxide film, which can be fabricated in the form of nanowires [ 26 , 27 ], nanofibers [ 28 , 29 ], nanocrystalline thin films [ 30 ], nanocomposite thin films [ 31 – 33 ], microstructures TiO 2 films [ 34 ], titanium oxide nanotubes [ 35 ], nanopowders [ 36 , 37 ], nanocolumns [ 38 ] and nanostructured films produced by glancing angle deposition [ 39 ] or sol-gel [ 30 ] techniques.…”

Moisture sensing studies of CuO‐ZnO nanocomposites

“…Due to its high chemical stability, low dielectric constant, large electromechanical coupling coefficient, and high luminous transmittance, ZnO materials have been widely used as a dielectric ceramic, pigment, catalyst, and sensing material. Besides being a multifunctional material, ZnO has a large exciton binding energy of 60 mV with a hexagonal wurtzite structure (a = 3.249 Å and c = 5.21 Å) . Doping is an effective technique for manipulating various applications of semiconductors.…”

“…Besides being a multifunctional material, ZnO has a large exciton binding energy of 60 mV with a hexagonal wurtzite structure (a=3.249 A and c=5.21 A). [4][5][6][7][8][9][10] Doping is an effective technique for manipulating various applications of semiconductors. The copper oxide (CuO) is a narrow band gap (1.7 eV) p-type semiconductor material having monoclinic crystal structure 11 and draw much attention since the starting growth material is inexpensive and easy to get, and the methods to prepare these materials are of low cost.…”

Comparative study of carbon dioxide sensing by Sn-doped TiO2 nanoparticles synthesized by microwave-assisted and solid-state diffusion route

“…Chemisorption model was used to explain the H 2 sensing mechanism (Benkara et al 2013). Nanostructured Sn-doped TiO 2 has been reported by (Raji et al 2011), which is prepared by ball milling using SnO 2 and TiO 2 as raw materials. This work pointed out that Sn-doped TiO 2 possessed the highest humidity sensitivity, than pristine TiO 2 and SnO 2 .…”