2026-06-08T09:10:54Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/1311382026-01-29T00:52:34Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Ramos Ramos, Diego J. author Vásquez Villanueva, G. Cristian author Maestre Varea, David author 2025-01-29 The high stability and intrinsic p-type nature of nickel oxide (NiO) make it an interesting material for modern oxide-based technology microdevices. Nowadays, the industry demands more sustainable, highly efficient, and low-energy-consumption synthesis routes as an alternative to conventional methods that commonly involve high temperatures for long times or complex chemical routes. In this work, a fast, low-cost, and energy-saving synthesis based on the Joule heating (JH) process has been employed for the fabrication of micro- and nanocrystalline NiO. The as-grown NiO samples have been investigated as a function of the growth parameters, and special attention has been paid to the differences and similarities between microcrystals grown by JH or vapor-solid (VS) thermal treatments. In particular, Raman spectroscopy reveals that the JH process results in a very reproducible and controllable NiO microcrystalline structure as compared to VS regardless of the fast oxidation process. Cross-sectional analysis of the NiO grown by JH confirms the presence of inner/outer regions with variable microstructure, composition, and physical properties as a function of the different oxidation conditions promoted during the JH process. The mechanisms underlying the JH process have been discussed and compared with those related to the VS method. Ramos-Ramos, D. J.; Vásquez, G. C.; Maestre, D. Micro- and Nanocrystalline NiO Synthesized by Joule Heating and Thermal Oxidation Methods: A Comparative Study. Crystal Growth & Design 2025, 25 (4), 1101–1110. https://doi.org/10.1021/acs.cgd.4c01439. 1528-7505 10.1021/acs.cgd.4c01439 https://hdl.handle.net/20.500.14352/131138 1528-7483 https://doi.org/10.1021/acs.cgd.4c01439?urlappend=%3Fref%3DPDF&jav=VoR&rel=cite-as https://pubs.acs.org/doi/10.1021/acs.cgd.4c01439 Micro-and nanocrystalline NiO synthesized by Joule heating and thermal oxidation methods: a comparative study