Synthesis and gas-sensing characteristics of α-Fe 2 O 3 hollow balls

Chu Manh Hung, Nguyen Duc Hoa, Nguyen Van Duy, Nguyen Van Toan, Dang Thi Thanh Le, Nguyen Van Hieu
2016 Journal of Science: Advanced Materials and Devices  
The synthesis of porous metal-oxide semiconductors for gas-sensing application is attracting increased interest. In this study, a-Fe 2 O 3 hollow balls were synthesized using an inexpensive, scalable, and template-free hydrothermal method. The gas-sensing characteristics of the semiconductors were systematically investigated. Material characterization by XRD, SEM, HRTEM, and EDS reveals that singlephase a-Fe 2 O 3 hollow balls with an average diameter of 1.5 mm were obtained. The hollow balls
more » ... The hollow balls were formed by self assembly of a-Fe 2 O 3 nanoparticles with an average diameter of 100 nm. The hollow structure and nanopores between the nanoparticles resulted in the significantly high response of the a-Fe 2 O 3 hollow 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 NH 3 promising significant application.
doi:10.1016/j.jsamd.2016.03.003 fatcat:6zlyp7dtirhi7elefhdfs5srly