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J Nanosci Nanotechnol. 2020 Apr 1;20(4):2259-2266. doi: 10.1166/jnn.2020.17369.

Influence of NH₃ Flow Rate on the Ferromagnetic Properties of N-Doped SnO₂ Nanowires.

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Department of Physics, School of Science, Lanzhou University of Technology, 287 Langongping Avenue, Lanzhou, Gansu, 730050, P. R. China.


N-doped SnO₂ nanowires were synthesized via chemical vapor deposition in the presence of NH₃ gas with SnO₂ nanowires as the precursor. All samples exhibited room-temperature ferromagnetism (FM). X-ray diffraction measurement showed that the FM is intrinsic. Results of vibrating sample magnetometry indicated that FM decreased along with increasing NH₃ flow rate. Further analysis by X-ray photoelectron spectroscopy showed that the N atom was substituted at the lattice site of O, and NH₃ was chemisorbed in the surface of samples. The chemisorbed NH₃ was the dominant ingredient and main factor causing the significant decrease in FM. However, the FM of the samples after etching was enhanced due to the doped N atoms.


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