Synthesis, Characterization, and Gas-Sensing Properties of Mesoporous Nanocrystalline Sn<SUB><I>x</I></SUB>Ti<SUB>1-<I>x</I></SUB>O<SUB>2</SUB>

Abstract

A nanocomposite mesoporous material composed by SnO2 and TiO2 with the size of -5-9 nm were prepared via a facile wet-chemical approach combining with an annealing process. The microstructure of obtained Sn(x)Ti(1-x)O2 powders were characterized by X-ray diffraction, X-ray Photo-electronic Spectroscopy, scanning electron microscope, transmission electron microscope and nitrogen adsorption-desorption experiment. The gas sensing performances to several gases of the mesoporous material were studied. The sensors of Sn(x)Ti(1-x)O2 (ST10, with 9.1% Ti) exhibited very high responses to volatile organic compounds at 160 degrees C. The order of the responses to volatile gases based on ST10 was ethanol > formaldehyde > acetone > toluene > benzene > methane. Sensor based on ST10 displays a highest sensitivity to hydrogen at 200 degrees C. Sensor responses to H2 at 200 degrees C have been measured and analyzed in a wide concentration range from 5 to 2000 ppm. The solid solution Sn(x)Ti(1-x)O2 can be served as a potential gas-sensing material for a broad range of future sensor applications.

Effect of Composition and Structure of Metal Oxide Composites Nanostructured on Their Conductive and Sensory Properties

“…[36,39,40,42]. The increased sensory effect during the detection of compounds of this nature also occurs as a result of isovalent doping of SnO 2 with Ti 4+ [44,45].…”

Self-arrangement of nanoparticles toward crystalline metal oxides with high surface areas and tunable 3D mesopores

“…Mesoporous transition metal oxides, which have crystalline framework of metal oxides as well as well-developed controllable porosity, have been considered to have extensive promising applications 1 2 . Particularly, many researchers have studied mesoporous metal oxides, such as titania, zirconia, niobia, tin oxide and mixed oxides, due to the inherent framework functionalities and the potential applications 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 . In order to make use of the unique physicochemical properties of metal oxides, the walls have to be highly crystalline.…”