Synthesis and H2S-Sensing Properties of MOF-Derived Cu-Doped ZnO Nanocages

• Published in: Nanomaterials (Basel, Switzerland) Vol. 12; no. 15; p. 2579
• Main Authors: Qi, Beiying, Wang, Xinchang, Wang, Xinyue, Cheng, Jipeng, Shang, Yuanyuan
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 27.07.2022; MDPI
• Subjects: Adsorption; Copper; Crystal structure; Cu doping; Doping; Gases; H2S sensing; High resolution electron microscopy; Hydrogen sulfide; Imidazole; Metal oxides; Metal-organic frameworks; MOF-derived ZnO; Morphology; nanocages; Nanomaterials; Scanning electron microscopy; Sensors; Transmission electron microscopy; X-ray diffraction; Zinc oxide; Beijing China; United States > US; China
• ISSN: 2079-4991; 2079-4991
• DOI: 10.3390/nano12152579

Metal–organic framework (MOF)-derived pure ZnO and Cu-doped ZnO nanocages were fabricated by calcining a zeolitic imidazole framework (ZIF-8) and Cu-doped ZIF-8. The morphology and crystal structure of the samples were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HRTEM). It was found that Cu doping did not change the crystal structures and morphologies of MOF-derived ZnO nanocages. The H2S-sensing properties of the sensors based on ZnO and Cu-doped ZnO nanocages were investigated. The results indicated that the H2S-sensing properties of MOF-derived ZnO nanocages were effectively improved by Cu doping, and the optimal doping content was 3 at%. Moreover, 3 at% Cu-doped ZnO nanocages showed the highest response of 4733 for 5 ppm H2S at 200 °C, and the detection limit could be as low as 20 ppb. The gas-sensing mechanism was also discussed.