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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 ballsdoi:10.1016/j.jsamd.2016.03.003 fatcat:6zlyp7dtirhi7elefhdfs5srly