A metallic oxide gas sensor array for a selective detection of the CO and NH3 gases

Nanoporous Nb2O5 hydrogen gas sensor

“…There are many reports on the gas sensing properties of nanostructured metal oxides such as SnO 2 , ZnO, TiO 2 , WO 3 , In 2 O 3 , CuO, NiO, Ga 2 O 3 , and V 2 O 5 [5][6][7][8][9][10][11][12][13][14]. However, a much smaller number of papers address the feasibility of Nb 2 O 5 for gas sensing [15][16][17][18][19][20][21][22][23][24]. Nb 2 O 5 is known as a wide band-gap n-type metal oxide and has desirable properties such as good chemical stability, low film stress, and a high refractive index (n = 2.4 at 550 nm) [25].…”

“…The first report on Nb 2 O 5 gas sensors dates back to the early 1980s [15]. However, comprehensive reports on Nb 2 O 5 mostly belong to the mid to late 1990s [16][17][18][19]. In these works, techniques such as radio frequency magnetron sputtering were used for the deposition of dense Nb 2 O 5 films and operating temperatures as high as 500 ºC were implemented to sense gases such as O 2 , NH 3 and CO. Porous Nb 2 O 5 films for gas sensing were later reported.…”

Fuzzy Logic based Odour Classification System in Electronic Nose

“…Each sensor has different sensing mechanism. Gas sensors are devices that translate the changes in the concentration of gaseous chemical species into electrical signals by changing the conductivity of the metal oxide layer [10].…”

Growth and characterization of epitaxial tin oxide thin films by laser molecular beam epitaxy

“…SnO 2 growth on Pt(111). (a) Large scale STM image of SnO 2(101) crystallites with preferential orientation along the three low symmetry directions of Pt(111). (b) Atomic resolution STM image of SnO 2 /Pt, in which the SnO 2 (101) unit cell is indicated by a gray rectangle.…”

“…As shown in the figure, except for the strong substrate peaks located at 25.6° and 52.5°, which corresponds to the (101 ̅ 2) and (202 ̅ 4) reflection of sapphire, respectively, the other two peaks are located at 33.9° and 71.3°. These two peaks can be assigned to the(101) and(202) reflections of the rutile phase SnO 2 . From this 2θ-ω XRD scan result, the out-of-plane epitaxial relationship is SnO 2 (101) // sapphire(101 ̅ 2) .…”