Synthesis and enhanced gas sensing properties of flower-like ZnO/α-Fe2O3 core-shell nanorods. Issue 8 (1st June 2017)

• Record Type: Journal Article
• Authors: Zhang, Bowen; Fu, Wuyou; Meng, Xianwei; Ruan, A.; Su, Pengyu; Yang, Haibin
• Is Part Of: Ceramics international. Volume 43:Issue 8(2017)
• Page Start: 5934
• Page End: 5940
• Publication Date: 2017-06-01
• Subjects: Flower-like morphology -- Core-shell structure -- ZnO/α-Fe2O3 -- Gas sensors; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2017.01.101
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: This paper reports a facile two-step synthesis route for the preparation of flower-like ZnO/α-Fe2 O3 nanorods (NRs). Flower-like ZnO NRs with the average diameter about 810 nm and length about 4.5 µm were firstly synthesized via a chemical solution method, and then ZnO NRs was coated with a continuous α-Fe2 O3 layer to form ZnO/α-Fe2 O3 core-shell structure through an ionic-layer adsorption and reaction method. The gas-sensing results show that the ZnO/α-Fe2 O3 NRs exhibit excellent sensitivity, selectivity, and response-recovery capacity to ethanol vapor at a low optimum temperature of 240 °C. In particular, compared with pure ZnO NRs and α-Fe2 O3 nanoparticles (NPs), the ZnO/α-Fe2 O3 NRs show an obvious improvement in gas sensing properties. The substantial improvement of sensing properties may be attributed to the unique microstructure and heterojunction formed between ZnO and α-Fe2 O3 .