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High acetone-sensing performance of bi-phase a-/g-Fe2O3 submicron flowers grown using an iron plate

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This work introduces a simple process to synthesize directly bi-phase a-/g-Fe2O3 submicron flowers on a Fe foil in NH4OH. The flowers were assembled by using many nanoplates with an estimated thickness of 20e80 nm. The shapes and dimensions of the flowers can be controlled by the treatment time. | Journal of Science Advanced Materials and Devices 6 2021 27e32 Contents lists available at ScienceDirect Journal of Science Advanced Materials and Devices journal homepage www.elsevier.com locate jsamd Original Article High acetone-sensing performance of bi-phase a- g-Fe2O3 submicron flowers grown using an iron plate Vu Xuan Hien a Luong Huu Phuoc a Cao Tien Khoa b Dang Duc Vuong a Nguyen Duc Chien a a School of Engineering Physics Hanoi University of Science and Technology HUST 01 Dai Co Viet Street Hanoi Viet Nam b Department of Physics Thai Nguyen University of Education 20 Luong Ngoc Quyen Street Thainguyen Viet Nam a r t i c l e i n f o a b s t r a c t Article history Iron oxide nanostructures have been studied extensively because of their excellent magnetic optical Received 6 June 2020 electrical and catalytic properties. This work introduces a simple process to synthesize directly bi-phase Received in revised form a- g-Fe2O3 submicron flowers on a Fe foil in NH4OH. The flowers were assembled by using many 8 September 2020 nanoplates with an estimated thickness of 20e80 nm. The shapes and dimensions of the flowers can be Accepted 14 September 2020 controlled by the treatment time. The gas-sensing properties of the a- g-Fe2O3 submicron flowers were Available online 17 September 2020 investigated at different gas concentrations 125e1500 ppm and operating temperatures 200e360 C . The results obtained indicate that the as-synthesized material exhibits an excellent acetone-sensing Keywords Iron oxides characteristic and has the potential for practical applications. Metal 2020 The Authors. Publishing services by Elsevier B.V. on behalf of Vietnam National University Hanoi. Nanoplates This is an open access article under the CC BY license http creativecommons.org licenses by 4.0 . Surface reaction Gas sensors 1. Introduction issue several studies have pre-treated the metal surface in alkaline solutions to modulate the morphology 11 . This method has been Many metal .