Metal‐Organic Frameworks‐Derived Porous In₂O₃ Hollow Nanorod for High‐Performance Ethanol Gas Sensor

Abstract

Designing hollow micro/nano structures for gas sensing materials is highly desirable for boosting gas sensing properties and still remains challenging, especially through a simple and economic way. Herein, porous In2O3 hollow nanorod (In2O3‐HNR), which was successfully fabricated by thermal decomposition of an In–MOF (CPP‐3) precursor, was applied as gas sensing materials. The pristine CPP‐3 and obtained In2O3‐HNR were systematically characterized by various techniques, such as XRD, SEM, TEM, TGA‐DTA, XPS, Raman and N2 physisorption. Characterization results indicated that the hexagonal rod‐like shape of original CPP‐3 was maintained after calcination, whereas the surface became rough and concave. In addition, the obtained In2O3‐HNR displayed a hollow interior with porous shell composed by In2O3 nanoparticles (9 nm). Taking advantage of this unique porous nanostructure, In2O3‐HNR exhibited a response as high as 6.2 to 5 ppm ethanol at operating temperature of 200 °C, fast response and recovery (3 and 4 s, respectively), and good selectivity to ethanol. The excellent ethanol‐sensing properties endow this In–MOF templated In2O3‐HNR material with a promising application in practical detection of ethanol gas. This method could be extended to the fabrication of other micro/nano structures with well‐defined morphology and composition for high‐performance gas sensing considering diversity of MOFs family.

In2O3/In2S3 Heterostructures Derived from In‐MOFs with Enhanced Visible Light Photocatalytic Performance for CO2 Reduction

“…MOFs, a group of organic‐inorganic hybrid materials, are widely used in multiple research fields like gas storage and separation, [19] fuel cells, [20] gas sensor, [21] supercapacitors [22] and photocatalysis [23] because of their unique porous and highly crystalized microstructure [24] . In photocatalysis, materials derived from MOF precursors have large surface area for better light harvesting ability and more active sites [15a,23a] .…”

Investigation on Trimethylamine Sensing Performance of PdO‐Decorated ZnO Flower‐Like Structures Synthesized by One‐ Step Hydrothermal Method

“…Due to the improvement of people's life, it is significant to monitor toxic and harmful gases timely and effectively. In recent years, metal oxide semiconductors such as ZnO,, SnO 2 ,, In 2 O 3 ,, WO 3 ,, NiO, Co 3 O 4 , etc. have been widely used for gas monitoring because of their high response, simple synthesis and low cost.…”

ZnO-Decorated In/Ga Oxide Nanotubes Derived from Bimetallic In/Ga MOFs for Fast Acetone Detection with High Sensitivity and Selectivity

“…Hollow one-dimensional (1D) nanomaterials possess a high surface-to-volume ratio and large surface area to facilitate gas adsorption and diffusion, leading to significant enhancement in gas sensing performance. , As is well known, the template is an effective way to obtain a 1D nanomaterials. Recently, metal–organic frameworks (MOFs) have been used as versatile precursors or sacrificial templates to prepare state-of-the-art functional nanomaterials with well-defined structures (hollow and core–shell nanostructures) for different applications by taking after their inherent advantages of porosity, large surface area, and flexible functionality adjustment. , Aside from its direct applications, ongoing studies including this one indicated that MIL-68 (In) can be converted into In 2 O 3 , , In 2 S 3 , and their hybrids for applications such as gas sensors and photocatalysts. Furthermore, studies have revealed their promising capabilities and thus show enhanced performance of gas sensors by the addition of a foreign component in the form of dopants or surface decoration.…”