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Hamburger-like alpha-iron oxide (α-Fe2O3) microparticles were fabricated by a simple and low-cost hydrothermal route at 140°C for 16h and subsequently by annealing process. The microparticles showed monodisperse porous structures with the length and the width about 2.7 and 2.2μm, respectively. The sensor based on this unique structure displayed excellent gas-sensing properties to acetone at the optimal...
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