High aspect ratio In2O3 nanowires: Synthesis, mechanism and NO2 gas-sensing properties

In2O3 microbundles constructed with well-aligned single-crystalline nanorods: F127-directed self-assembly and enhanced gas sensing performance

“…Examples include MnWO 4 [14], PbTiO 3 [16], LiFePO 4 [17], In 2 O 3 [13,[18][19][20], PbWO 4 [21], LaPO 4 [5], and so on. In 2 O 3 , an important n-type semiconductor with a direct band gap of 3.55-3.75 eV, has been extensively studied and applied in the field of solar cells [22], transistor [23], photocatalysis [24] and gas sensors for detection of ethanol [13], 2-chlorophenol [20], NO 2 [25], NH 3 [26], H 2 S [27], and CO [28]. Up to now, various wet-chemical routes, such as hydrothermal/solvothermal reaction [29,30], sonohydrolysis [31], nanocasting procedure [32,33], and sol-gel technique [34], have been employed to generate diverse In 2 O 3 nanomaterials with controllable structure and morphology including nanotubes [35], nanocubes [36], nanofibers [37], nanorods [36], hollow spheres [13], and mesoporous In 2 O 3 [32,33,[38][39][40].…”

Hydrogen sensors made of undoped and Pt-doped SnO2 nanowires

“…Recently, it was reported that quasi-one-dimensional nanomaterials such as nanowires, nanobelts, and nanotubes showed high sensitivity, quick response, and enhanced ability to detect gases at low concentrations because of their high surface-to-volume ratio, single crystalline structure, and great surface activity [10,[13][14][15][16]. Of these nanomaterials, quasi-one-dimensional SnO 2 has been extensively studied.…”

Enhanced NO2 sensing characteristics of Pd-functionalized networked In2O3 nanowires

“…In single-crystalline sensors, the faces exposed to gaseous environments are always the same and almost all of the adsorbed species are active in generating a surface depletion layer [28,29], whereas only a small fraction of the adsorbed species near the grain boundaries are active in modifying electrical transport properties in polycrystalline devices. Several researchers have reported the NO 2 gas sensing properties of In 2 O 3 nanowires [30][31][32].…”