Three-dimensional ultrathin In₂O₃ nanosheets with morphology-enhanced activity for amine sensing

Abstract

Ultrathin materials have a wide range of applications in catalysis and sensing owing to their very large surface to volume ratio and great amount of exposed active sites.Herein, we report the synthesis of three dimensional (3D) In 2 O 3 materials with high surface area composed of ultrathin nanosheets, ca. 2 nm, using indium glycerolate as the precursor. The structural evolution process of the indium glycerolate precursor was monitered by thermogravimetric analysis, infrared spectroscopy and transmission electron microscopy. The resulting In 2 O 3 nanosheets show excellent amine sensing performance at room temperature because ultrathin nanosheets offer a large amount of active sites on the surface and the 3D structure adds an additional advantage to avoid the aggregation and to facilitate the diffusion of target gas. In addition, the gas sensing mechanism is also proposed in this study.

One-Step Synthesis of Co-Doped In2O3 Nanorods for High Response of Formaldehyde Sensor at Low Temperature

“…The BET surface areas of the pure In 2 O 3 and In 2 O 3 /1%Co samples are 129.81 and 126.69 m 2 g –1 , respectively. Compared with other morphological materials reported in the literature, − the rodlike structure we have obtained has much larger specific surface area, which could provide abundant reaction sites to facilitate gas molecular diffusion and consequently improve the gas sensing properties.…”

Green emission of indium oxide via hydrogen treatment

“…This featureless absorption is attributed to hydrogen induced changes of the CB and shallow donor state (DS) electron concentration in nonstoichiometric n-type semiconducting oxides. 32,[44][45][46] Hydrogen treatment on In 2 O 3 may yield different defects, such as substitutional hydrogen at oxygen site and interstitial hydrogen at anti-bonding position. And these defects are shallow, which slightly overlap the bottom of the conduction band (CB).…”

Atomically Dispersed Au on In2O3 Nanosheets for Highly Sensitive and Selective Detection of Formaldehyde

“…The BET surface areas of products are listed in Table , and all of the values are higher than 100 m 2 /g. Supports with a high specific surface area are highly desirable for the development of precious metal-loaded catalysts, which provide more sites for loading, increase the dispersion of metals, and improve the utilization efficiency of precious metals. , The corresponding BJH pore size distribution curves (insets of Figure S2) show that the pore sizes are mainly around 30 nm, which is related to the gap formed by adjacent ultrathin nanosheets . It is worth noting that the pore about 2 nm may be due to the nanosheets’ microporous structure.…”

“…43,44 The corresponding BJH pore size distribution curves (insets of Figure S2) show that the pore sizes are mainly around 30 nm, which is related to the gap formed by adjacent ultrathin nanosheets. 45 It is worth noting that the pore about 2 nm may be due to the nanosheets' microporous structure. The abundant pore can accelerate gas transmission during the sensing process and improve the sensing properties.…”