Urchin-like Na-doped zinc oxide nanoneedles for low-concentration and exclusive VOC detections  

作　　者：Yiwen Zhou Yifan Luo Zichen Zheng Kewei Liu Xiaoxi He Kaidi Wu Marc Debliquy Chao Zhang 

机构地区：[1]College of Mechanical Engineering,Yangzhou University,Yangzhou 225127,China [2]Material Science Department,University of Mons,Mons 7000,Belgium

出　　处：《Journal of Advanced Ceramics》2024年第4期507-517,共11页先进陶瓷（英文）

基　　金：the Outstanding Youth Foundation of Jiangsu Province of China(No.BK20211548);the Yangzhou Science and Technology Plan Project(No.YZ2023246);the Qinglan Project of Yangzhou University,and the Research Innovation Plan of Graduate Education Innovation Project in Jiangsu Province(No.KYCX23_3530).

摘　　要：In the early-stage diagnosis of lung cancer,the low-concentration(<5 ppm)volatile organic compounds(VOCs)are extensively identified to be the biomarkers for breath analysis.Herein,the urchin-like sodium(Na)-doped zinc oxide(ZnO)nanoneedles were synthesized through a hydrothermal strategy with the addition of different contents of citric acid.The Na-doped ZnO gas sensor with a 3:1 molar ratio of Na^(+)and citric acid showed outstanding sensing properties with an optimal selectivity to various VOCs(formaldehyde(HCOH),isopropanol,acetone,and ammonia)based on working temperature regulation.Specifically,significantly enhanced sensitivity(21.3@5 ppm)compared with pristine ZnO(~7-fold),low limit of detection(LOD)(298 ppb),robust humidity resistance,and long-term stability of formaldehyde sensing performances were obtained,which can be attributed to the formation of a higher concentration of oxygen vacancies(20.98%)and the active electron transitions.Furthermore,the improved sensing mechanism was demonstrated by the exquisite band structure and introduction of the additional acceptor level,which resulted in the narrowed bandgap of ZnO.

关 键 词：zinc oxide(ZnO) heterovalent ions doping citric acid gas sensor volatile organic compound(VOC)detection lungcancer 

分 类 号：TQ174.1[化学工程—陶瓷工业]