Synthesis, characterization and gas sensing properties of flowerlike In₂O₃ composed of microrods

Abstract

Flowerlike structured In 2 O 3 were successfully synthesized via a hydrothermal process and the subsequent calcinations. The obtained sample consists of microrods with an average diameter of 0.5-1 µm and a length of 1-3 µm. Structure and property of the sample were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The sensing properties towards trimethylamine (TMA) were examined at 200-400 °C, which showed high sensitivity, better selectivity, and prompt response/recovery merits.

Ultrasensitive detection of trimethylamine using Rh-doped SnO2 hollow spheres prepared by ultrasonic spray pyrolysis

“…And the decrease of T MAX can be explained by two opposite catalytic roles of Rh to enhance the gas response via catalytic dissociation of analyte gas into more reactive species at low temperature region and to suppress the gas sensing reaction via the complete oxidation of analyte gases to non-reactive species at high temperature region. In the literature, oxide semiconductors often show similar or comparable chemiresistive variations to TMA and C 2 H 5 OH [2,18,20,26], which is consistent with the present results. From this perspective, Rh can be also regarded as a good catalyst to promote the sensing of TMA, although this needs further systematic and detailed studies.…”

“…In our previous report, the high potential of Rh with distinctive catalytic properties was demonstrated by the ultrahigh responses of Rh-loaded In 2 O 3 hollow spheres to 100 ppm C 2 H 5 OH (R a /R g = 4748) [25]. Considering the literature reports of comparable or similar responses to C 2 H 5 OH and TMA [2,18,20,26], Rh can be regarded as a potential catalyst in designing highly sensitive TMA sensors. Nevertheless, the effect of Rh loading on the TMA sensing characteristics of representative SnO 2 sensors has been barely investigated.…”

Synthesis of In2O3 nanoparticle/TiO2 nanobelt heterostructures for near room temperature ethanol sensing

“…14 Indium oxide (In 2 O 3 ), an n-type indirect band semiconductor with an indirect band gap of 2.8 eV, has been recognized as the potential sensing material due to its high electric conductance. 15 Other studies also show that In 2 O 3 has high sensitivities to many gases such as H 2 , 16 CO, 12 NO 2 , 17 NH 3 , 18 O 3 , 19 and Cl 2 . 20 In particular, In 2 O 3 -based sensors have been reported to be highly selective to ethanol gas.…”

Indium-Containing Visible-Light-Driven (VLD) Photocatalysts for Solar Energy Conversion and Environment Remediation

“…Recently, photocatalysis driven by visible light has gained great attention, as the visible light occupies most part of the solar spectrum such as: bismuth compounds (Bi 2 WO 6 [13], Bi 2 MoO 6 [14], BiVO 4 [15], BiOBr [16]), silver compounds(AgAlO 2 [17], Ag 2 CrO 4 [18], Ag 2 CO 3 [19], AgVO 3 [20], Ag 3 PO 4 [21]), and indium compounds(In 2 O 3 [22], CaIn 2 O 4 [23], InVO 4 [24], In 2 S 3 [25]). Up to now, much attention has been given to a series of visible light active indium compound.…”

“…The enhanced photocatalytic activity is due to the CuO and In 2 O 3 forming heterogeneous structures, which can effectively improve the separation efficiency of the light-generated charge and extend the light absorption range. [34], chemical vapour deposition (CVD) [35], laser ablation (PLD) [36], metal organic chemical vapour deposition (MOCVD) [37], and a variety of wet chemical methods [38][39][40]. Among them, the characteristic of wet chemical method is the lowest preparation temperature, but their degree of crystallinity is poor; their morphology is mainly nanowire hexagonal structure, nanoparticles, and squares.…”