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|1. (WO2017152745) LANTHANUM-DOPED FORMALDEHYDE-SENSITIVE MATERIAL AND PREPARATION METHOD THEREFOR, AND FORMALDEHYDE SENSOR|
|Applicants:||SHARP KABUSHIKI KAISHA
|Title:||LANTHANUM-DOPED FORMALDEHYDE-SENSITIVE MATERIAL AND PREPARATION METHOD THEREFOR, AND FORMALDEHYDE SENSOR|
Provided are a lanthanum-doped formaldehyde-sensitive material and a preparation method therefor, and a formaldehyde sensor. The photocatalytic formaldehyde-sensitive material comprises lanthanum-doped zinc oxide nanoparticles, wherein the molar ratio of lanthanum is 0.1% - 5%. The preparation method for the photocatalytic formaldehyde-sensitive material comprises: 1) mixing zinc oxide nanoparticles with a lanthanum salt, and dissolving same with anhydrous ethanol to obtain a solution A; 2) mechanically-grinding solution A with a ball mill to obtain a solution B; and 3) evaporating the solvent of the solution B to dryness so as to obtain a product C, i.e., the photocatalytic formaldehyde-sensitive material. Through optimization of the doping amount of lanthanum in zinc oxide, the lower limit of detection for formaldehyde is successfully decreased to 0.08 ppm, thus remarkably improving the sensitivity of the sensor. The preparation method for the photocatalytic material is simple and suitable for large-scale production. The discharge of waste water during the preparation is greatly reduced, and thus the environmental pollution is lowered.