High sensitivity and selectivity of formaldehyde sensor based on Nd2O3 @In2O3 heterojunction rod-like composites
Source abstract
Abstract
The rare-earth material Nd 2O 3 , which has abundant oxygen vacancy defects and unique structural property of 4f‐4f electron leap, shows its great potential for chemical sensing applications. However, the difficulty in selecting suitable Nd-precursor complexes has limited the synthesis and further applications of Nd 2O 3 materials. Herein, we synthesized Nd(OH) 3 using a simple solvent method, followed by calcination by mixing it with the precursor MIL-68(In) to generate Nd 2O 3 surface-modified In 2O 3 composites. After that, its gas-sensitive performance was investigated. It was observed that the response of 5 wt% Nd 2O 3 @In 2O 3 to formaldehyde (100 ppm) is the highest (850.3), which is 25 times higher than that of In 2O 3. Compared with In 2O 3, Nd 2O 3-decorated In 2O 3 not only exhibited higher sensitivity and better selectivity but also reduced response time. The improved gas-sensing performance could be attributed to the formation of heterojunctions between Nd 2O 3 and In 2O 3 as well as the increase of adsorbed oxygen and defective oxygen. This kind of gas sensor based on Nd 2O 3-decorated In 2O 3 has more obvious advantages for fast and high-response detection of formaldehyde.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Gas Sensing Nanomaterials and Sensors · Advanced Chemical Sensor Technologies · Analytical Chemistry and Sensors
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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