| Title: | Enhanced chemiresistive sensing performance of well-defined porous CuO-doped ZnO nanobelts toward VOCs |
| Author(s): | Li G; Su Y; Chen XX; Chen L; Li YY; Guo Z; |
| Address: | "Institutes of Physical Science and Information Technology, Anhui University Hefei 230601 People's Republic of China lichen@ahu.edu.cn zhguo@ahu.edu.cn. Key Laboratory of Environmental Optics and Technology, Institute of Intelligent Machines, Chinese Academy of Sciences Hefei 230031 People's Republic of China" |
| ISSN/ISBN: | 2516-0230 (Electronic) 2516-0230 (Linking) |
| Abstract: | "Although the post-doping approach as a typical and effective method has been widely employed to improve the gas sensing performance of nanostructured metal oxides, it easily breaks their porous nanostructures. Herein a facile partial cation-exchange strategy combined with thermal oxidation has been developed to prepare porous CuO-doped ZnO nanobelts. Using ZnSe.0.5N(2)H(4) nanobelts as the precursor template, Cu(2)Se-doped precursor nanobelts were obtained with Zn(2+) cations partially exchanged by Cu(2+) cations. After annealing in air, they are further oxidized into well-defined porous CuO-doped ZnO nanobelts. Through manipulating the amount of exchanged Cu(2+) cations, the CuO-doping concentration can be precisely tuned. Based on the assembly approach and in situ thermal oxidation, a uniform and stable sensing film consisting of porous CuO-doped nanobelts was fabricated. Compared with pristine porous ZnO nanobelts, the as-prepared porous CuO-doped nanobelts with p-type CuO|n-type ZnO heterojunctions exhibited better sensing performance toward volatile organic compounds (VOCs). Especially for 3 at% CuO-doped porous ZnO nanobelts, the relative responses toward 100 ppm of ethanol, acetone and formaldehyde were greatly enhanced more than two, four and ten times, respectively. Due to the porous structure, they also displayed a fast response/recovery time. Finally, this enhanced sensing mechanism was discussed for porous CuO-doped ZnO nanobelts" |
| Notes: | "PubMed-not-MEDLINELi, Gang Su, Yao Chen, Xu-Xiu Chen, Li Li, Yong-Yu Guo, Zheng eng England 2019/08/12 Nanoscale Adv. 2019 Aug 12; 1(10):3900-3908. doi: 10.1039/c9na00163h. eCollection 2019 Oct 9" |
