水热法制备掺杂铒的ZnO及其对二甲胺气敏性能

Synthesis of ZnO Doped with Erbium by Hydrothermal Method and Gas Sensing Properties towards Dimethylamine

采用低温水热法制备了Zn O及一系列掺杂Er的Zn O(Zn O:x%Er)粉末。通过X射线衍射分析制备的样品为六方纤锌矿结构,Er以三价离子形式化学掺杂到Zn O中。扫描电镜显示制备的样品均为二维片状,且能量色散X射线光谱及X光电子能谱表明了制备的样品由Zn,O及Er元素组成。气敏测试结果显示Zn O:3%Er材料对二甲胺具有良好的灵敏度,在300℃对100×10-6二甲胺灵敏度可达到106.51。该样对二甲胺具有良好的稳定性和快速的响应恢复时间,响应时间为6 s,恢复时间为11 s。在胺类气氛中,Zn O:3%Er对二甲胺具有优异的选择性。Zn O:3%Er良好的气敏性能可能与其表面含有较高储氧能力的Er3+有关。

The ZnO powder and a series of ZnO powders doped with erbium （ZnO：x% Er） were preparea oy low temperature hydrothermal methods. X-ray diffraction analyses showed that the prepared samples were hexagonal wurzite structures and erbium was chemically doped in ZnO crystal lattice as trivalent ions. Scanning electron mi- croscope measurements exhibited the prepared samples were two dimensional sheet-shapes. The obtained samples were composed of Zn, O and Er elements, characterized by energy dispersive X-ray spectroscopy and X-ray photoe- lectron spectroscopy. The gas sensing results showed that the ZnO：3% Er exhibited better sensitivity towards dime- thylamine, and the sensitivity obtained 106.51 × 10-6 to 100 × 10-6 dimethylamine at 300 ℃. The sensitivity of ZnO ：3% Er towards dimethylamine exhibited excellent stability and short response-recovery time, and the response time was 6 s, and the recovery time was 11 s. In the atmosphere of amine, ZnO ：3 % Er displayed outstanding se- lectivity towards dimethylamine. The excellent gas sensing properties of ZnO ：3 % Er were possibly related to Er3＋ with high oxide-storage property on the surface.