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Bi-Te nanoplates (NPs) grown by a low pressure vapor transport method have been studied by Raman spectroscopy, atomic force microscopy (AFM), energy-dispersive X-ray spectroscopy (EDS), and Auger electron spectroscopy (AES). We find that the surface of relatively thick (more than tens of nanometers) Bi 2 Te 3 NPs is oxidized in the air and forms a bump under heating...