Rhombic ZnO nanosheets modified with Pd nanoparticles for enhanced ethanol sensing performances: An experimental and DFT investigation. (January 2020)

• Record Type: Journal Article
• Authors: Zhang, Yong-Hui; Li, Yu-Liang; Shen, Xin-Ran; Xie, Ke-Fei; Li, Tian-Yu; Zhao, Jiu-Nan; Jia, Qiao-Juan; Gong, Fei-Long; Fang, Shao-Ming
• Is Part Of: Journal of physics and chemistry of solids. Volume 136(2020)
• Publication Date: 2020-01
• Subjects: Rhombic ZnO -- Porous materials -- DFT -- Sensors; Solids -- Periodicals; Solides -- Périodiques; Solids; Periodicals; 530.41
• DOI: 10.1016/j.jpcs.2019.109144
• Languages: English
• ISSNs: 0022-3697

Abstract

Abstract: The rhombic ZnO nanosheets were prepared via a facile and controllable hydrothermal method. The porous Pd@ZnO material was produced by annealing at 400 ° C for 2 h. The Pd@ZnO (0.2 wt%) exhibits 4.3 times higher response (142.2 for ethanol with 200 ppm) than the pure ZnO, and shorter response-recovery time (13 s/9 s). The DFT calculation shows that the rhombic ZnO nanosheets exhibit reduced band gap and high adsorption energy by introducing Pd atom. The enhanced gas sensing properties could be attributed to the superior catalytic capacity of Pd nanoparticles and the tunable band structure of the ZnO nanosheet. Highlights: The rhombic ZnO nanosheets were successfully prepared by a facile hydrothermal method. Pd-loaded ZnO exhibits high gas sensing response, excellent selectivity and ultrashort recovery time. The band gap of ZnO could be effectively tuned by the introducing Pd atom.