Synthesis of indium oxide cubic crystals by modified hydrothermal route for application in room temperature flexible ethanol sensors

Advances in designs and mechanisms of semiconducting metal oxide nanostructures for high-precision gas sensors operated at room temperature

“…properties, and thermal and chemical stability, many plastic substrates have been used as flexible substrates for the RT gas sensors including polyethylene terephthalate (PET), 223,[402][403][404] polypropylene (PP), 405,406 polyimide (PI), 264,407,408 polyvinyl acetate (PVA) 105 and nylon. 409 For many of these flexible RT gas sensors, a sensitive layer such as ZnO nanorods is often used to deposit onto the device, for example, ZnO nanorods/nylon, 409 Ga-ZnO nanorods/PI, 264 Pd-ZnO nanorods/PI/PET.…”

“…For example, many of these sensors exhibit insufficient sensitivities. [104][105][106][107][108] (2) The response/recovery times of many RT gas sensors, which are crucial for rapid detection of target dangerous gases to timely trigger an alarm, are generally quite long, sometimes, up to tens of minutes. [109][110][111] (3) Poor reversibility has been reported for some of these sensors operated at RT.…”

An Efficient and Environment Friendly Universal-White-Light-Emitting ZnO Nanophosphors

“…Among these gases, 3%Cu-SnO 2 exhibited maximum response towards H 2 S at 150ºC. It clearly showed that except H 2 S (S=194), it displayed trivial sensitivity towards ethanol (S=49.7), ammonia (8), acetone (63.9), methanol (20) at 250 ºC, among the various metal-oxides that have been found to impart sensitivity and selectivity to SnO 2 for the detection of H 2 S. Cu found to have an outstanding promoter action. Therefore, H 2 S showed much better response in 3%Cu-SnO 2 than pure SnO 2 as shown in Fig.…”

“…The gas sensing characteristics of the materials can be improved by incorporating some additives into the oxide films. Catalysts like Pt, Pd, Ag, Ru, In, Fe and Cu [16][17][18][19][20][21][22] are often added to the base material to improve the gas sensitivity and selectivity. Among various additives tested, Cu has been proved to be an outstanding promoter in enhancing the catalytic activity and gas sensing properties of SnO 2 for H 2 S detection [22][23][24][25][26][27].…”

Indium oxide cubes prepared by hydrothermal synthesis as catalysts for CO oxidation

“…In 2 O 3 nanoparticles (99.99%, APS 30e50 nm) and a-Al 2 O 3 (99%, APS 30e40 nm) were obtained from Nanostructured & Amorphous Materials, Inc. In 2 O 3 cubes were prepared following a previously reported procedure by Seetha et al [23]. Briefly, 1 M indium chloride aqueous solution was added into 0.5 M of hexamethylenetetramine solution with continuous stirring for 30 min.…”