Development of nanocrystalline CrNbO4 based p-type semiconducting gas sensor for LPG, ethanol and ammonia

Gas sensing properties of surface acoustic wave NH3 gas sensor based on Pt doped polypyrrole sensitive film

“…[1,2]. During the past years, a lot of reliable and sensitive sensors detecting NH 3 have been developed; however, many of them need to operate at high temperature ranging from 150 to 500 • C [3][4][5][6][7][8][9][10][11], which shortens sensor life and increases power consumption. There are also some conducting polymer based gas sensors operating at low temperature, such as polyaniline (PANI), poly(3,4-ethylenedioxythiophene) (PEDOT) and PPy gas sensors.…”

Nanocrystalline gallium ferrite: A novel material for sensing very low concentration of alcohol vapour

“…The vapour response of GFO sensor was found to increase in the order of methanol o ethanolo isopropanol. The maximum sensitivity towards ethanol and isopropanol (S$ 0.9 at100 ppm) at 350 1C is quite remarkable when compared with reported VOC sensors using different materials like ZnO for isopropanol (S$ 0.8 at 100 ppm) and CrNbO 4 for ethanol (S$ 0.6 at 100 ppm) [28,29].…”

Single‐step preparation of rutile‐type CrNbO4 and CrTaO4 oxides from oxalate precursors–characterization and properties

“…20.82%). Apart from an exothermic peak at 635°C which is associated with crystallization of CrNbO 4 (inset in Figure 1A), 38 there are no other changes in TG and DTA curves during further heating as well as during the cooling. The final brown residue was identified to be CrNbO 4 oxide (exp.…”

“…21 There are several reports where heterometallic oxalate complexes have been successfully used for the preparation of mixedmetal oxides. 38 Compared to CrNbO 4 , literature reports on isostructural tantalum analogue CrTaO 4 are very rare. [2][3][4] Several metal oxides of MO 2 , MM′O 4 , and MM′ 2 O 6 stoichiometries adopt similar rutiletype structure.…”

“…It is known that the gas sensing material should have a microporous structure with small particle size and large surface area, and using the conventional ceramic route, uncontrolled grain growth at high temperature may occur; so a low temperature niobium-citrate complex process, which requires a lot of steps of preparation, was used. 38 Compared to CrNbO 4 , literature reports on isostructural tantalum analogue CrTaO 4 are very rare. Dielectric property and cation ordering/disordering effects upon photocatalytic activity of CrTaO 4 prepared by conventional solid-state reaction at 1300°C were reported.…”