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1. (WO2017152745) LANTHANUM-DOPED FORMALDEHYDE-SENSITIVE MATERIAL AND PREPARATION METHOD THEREFOR, AND FORMALDEHYDE SENSOR

Pub. No.:    WO/2017/152745    International Application No.:    PCT/CN2017/074090
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Tue Feb 21 00:59:59 CET 2017
IPC: G01N 27/04
Applicants: SHARP KABUSHIKI KAISHA
夏普株式会社
PEKING UNIVERSITY
北京大学
Inventors: ZHENG, Shu
郑淑
LI, Xingguo
李星国
ZHENG, Jie
郑捷
CHANG, Xinghua
常兴华
Title: LANTHANUM-DOPED FORMALDEHYDE-SENSITIVE MATERIAL AND PREPARATION METHOD THEREFOR, AND FORMALDEHYDE SENSOR
Abstract:
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.