Synthesis and gas-sensing characteristics of x -Fe2O3 hollow balls

Title: Synthesis and gas-sensing characteristics of x -Fe2O3 hollow balls
Authors: Nguyen, Duc Hoa
Chu, Manh Hung,
Nguyen, Van Toan
Dang, Thi Thanh Le
Nguyen, Van Duy
Nguyen, Van Hieu
Keywords: a-Fe2O3hollow balls;Hydrothermal;Gas sensors
Issue Date: 2016
Publisher: ĐHQGHN
URI: http://repository.vnu.edu.vn/handle/VNU_123/58330
The synthesis of porous metal-oxide semiconductors for gas-sensing application is attracting increased interest. In this study, a-Fe2O3 hollow balls were synthesized using an inexpensive, scalable, and template-free hydrothermal method. The gas-sensing characteristics of the semiconductors were sys-tematically investigated. Material characterization by XRD, SEM, HRTEM, and EDS reveals that single-phasea-Fe2O3hollow balls with an average diameter of 1.5 um were obtained. The hollow balls were formed by self assembly of a-Fe2O3 nanoparticles with an average diameter of 100 nm. The hollow structure and nanopores between the nanoparticles resulted in the significantly high response of thea-Fe2O3hollow balls to ethanol at working temperatures ranging from 250 C to 450 C. The sensor also showed good selectivity over other gases, such as CO and NH3 promising significant application

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