Taeño González, MaríaMaestre Varea, DavidRamírez Castellanos, JulioLi, ShaohuiLee, Pooi SeeCremades Rodríguez, Ana Isabel2023-06-172023-06-172021-022079-499110.3390/nano11020444https://hdl.handle.net/20.500.14352/7992© 2021 by the authors.Licensee MDPI This research was funded by FEDER/M-ERA.Net Cofund projects: RTI2018-097195-B-I00 and PCIN-2017-106.Achieving nanostructures with high surface area is one of the most challenging tasks as this metric usually plays a key role in technological applications, such as energy storage, gas sensing or photocatalysis, fields in which NiO is gaining increasing attention recently. Furthermore, the advent of modern NiO-based devices can take advantage of a deeper knowledge of the doping process in NiO, and the fabrication of p-n heterojunctions. By controlling experimental conditions such as dopant concentration, reaction time, temperature or pH, NiO morphology and doping mechanisms can be modulated. In this work, undoped and Sn doped nanoparticles and NiO/SnO_2 nanostructures with high surface areas were obtained as a result of Sn incorporation. We demonstrate that Sn incorporation leads to the formation of nanosticks morphology, not previously observed for undoped NiO, promoting p-n heterostructures. Consequently, a surface area value around 340 m^2/g was obtained for NiO nanoparticles with 4.7 at.% of Sn, which is nearly nine times higher than that of undoped NiO. The presence of Sn with different oxidation states and variable Ni^(3+)/Ni^(2+) ratio as a function of the Sn content were also verified by XPS, suggesting a combination of two charge compensation mechanisms (electronic and ionic) for the substitution of Ni^(2+) by Sn^(4+). These results make Sn doped NiO nanostructures a potential candidate for a high number of technological applications, in which implementations can be achieved in the form of NiO-SnO_2 p-n heterostructures.engAtribución 3.0 Españahttps://creativecommons.org/licenses/by/3.0/es/journal articlehttp://dx.doi.org/10.3390/nano11020444https://www.mdpi.com/2079-4991/11/2/444open access538.9Nickel oxideNanoparticlesNanosticksHigh surface areaDoping mechanismsFísica de materialesFísica del estado sólido2211 Física del Estado Sólido