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Pure and Er-doped In2O3 nanotubes were systematically fabricated by using a single nozzle eletrospinning method followed by calcination. The as-synthesized nanotubes were characterized by scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) spectrometry and X-ray powder diffraction (XRD). Compared with pure In2O3 nanotubes, Er-doped In2O3 nanotubes exhibit improved formaldehyde sensing...
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