Preparation of Porous In 2 O 3 Powders by Ultrasonic-spray Pyrolysis Employing PMMA Microspheres Synthesized by Emulsion Polymerization and Their Gas-sensing Properties

Content Provider	Semantic Scholar
Author	Hyodo, Takeo Furuno, Shu-Ichi Fujii, Eriko Katsuhide, Matsuo Motokucho, Suguru Kojio, Ken Shimizu, Yasuhiro
Copyright Year	2012
Abstract	The suspension containing polymethylmethacrylate (PMMA) microspheres was synthesized by the emulsion polymerization employing methyl methacrylate monomer, sodium lauryl sulfate as a surfactant and ammonium persulfate as an initiator, and porous In2O3powders(pr-In2O3(M), M: In2O3 source (N: In(NO3)3, Cl: InCl3))were prepared by ultrasonic-spray pyrolysis of In(NO3)3 or InCl3 aqueous solution containing the synthesized PMMA microspheres as a template. The average diameter of the PMMA microspheres, which was measured by dynamic light scattering, was ca. 60.2 nm. The pr-In2O3(N) powder consisted of large microspheres with well-developed spherical mesopores (≤ ca. 30 nm in diameter) and a small number of macropores (ca. 100 nm in diameter) on the spherical surface, while the pr-In2O3(Cl) powder was composed of meso-sized particles (ca. 30 nm in diameter), respectively. On the other hand, the morphology of conventional In2O3 powder (c-In2O3(N)) prepared by ultrasonic-spray pyrolysis of PMMA-free In(NO3)3 aqueous solution as a reference was roughlyspherical with a diameter of ca. 100~700nm and the bulk was relatively dense. The NO2 response of pr-In2O3(M) sensors was much larger than that of a c-In2O3(N) sensor. In addition, the response and recovery speeds of the pr-In2O3(M) sensors were faster than those of the c-In2O3(N) sensor.
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Alternate Webpage(s)	https://www.ama-science.org/proceedings/download/ZGN0ZN==
Language	English
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Resource Type	Article