Complementary switching in single Nb3O7(OH) nanowires

Abstract

Single nanowires and networks are considered as promising candidates for miniaturized memristive devices for brain-inspired systems. Moreover, single crystalline nanostructures are useful model systems to gain a deeper understanding in the involved switching mechanism of the investigated material. Here, we report on hydrothermally grown single crystalline Nb3O7(OH) nanowires showing a complementary resistive switching (CRS) behavior. The CRS characteristics can be related to an oxygen vacancy migration at the electrode/metal hydroxide interface. Therefore, an oxygen plasma treatment is used to reduce the oxygen vacancy content, resulting in a total reduction of the device conductivity. Furthermore, temporal resolved current–voltage measurements demonstrate the dependence of the destructive readout process of the resistance states on the voltage amplitude and polarity.

Oxygen-Vacancy-Mediated Large Binding Energy Exciton Dissociation in Nb3O7(OH) Nanorods with High Electron Mobility for CO2 Photoreduction

“…As well as the Nb 2 O 5 polymorphs, Nb 3 O 7 (OH) has also attracted attention as another class of niobium-containing compounds in the past decade. Typical hydrothermal synthesis strategies were applied, yielding many different well-controllable morphologies of Nb 3 O 7 (OH) nanostructures without using a template. − These Nb 3 O 7 (OH) nanostructures/superstructures, namely, large surface area, band gap of 3.2 eV, high chemical stability, and photochemical activity, render them attractive for photochemical and photophysical devices. For instance, a synthesized Nb 3 O 7 (OH) nanorod film, directly used as a photoanode for dye-sensitized solar cells (DSSCs), demonstrated an overall light conversion efficiency of 6.77%, which is the highest efficiency among all the reported DSSCs assembled with niobium oxide-based photoanodes .…”

“…Moreover, the three-dimensional (3D) hierarchical Nb 3 O 7 (OH) nanostructures demonstrated enhanced photocatalytic activity for the degradation of Rhodamine B and exhibited favorable recyclability . Additionally, it was discovered for the first time that Nb 3 O 7 (OH) single nanowires exhibit complementary resistive switching behavior directly related to the migration and redistribution of oxygen vacancies . While most research has focused on the applications of Nb 3 O 7 (OH), such as DSSCs and catalysis, the understanding of its crystal structure and optical and electronic properties, which significantly affect its applications, remains limited.…”

In-Depth Investigation of the Mechanism of Dehydration-Induced Phase Transformation from Nb3O7(OH) to H-Nb2O5: A Theoretical and Experimental Approach

“…8−17 Moreover, a complementary resistive switching behavior of the hydrothermally grown single crystalline Nb 3 O 7 (OH) nanowires was reported for the first time, which was related to an oxygen vacancy migration at its electrode/metal hydroxide interface. 8 Traditionally, the Nb 3 O 7 (OH) nanostructures/3D superstructures were prepared hydrothermally by treating niobium-(V) chloride in hydrochloric acid at 473−483 K. 8−17 A novel Nb 3 O 7 (OH) porous structure was also prepared by a facile one-pot hydrothermal method, employing a K 2 Nb 2 O 6 hollow sphere precursor. 18 723 K, while preserving the morphology and high surface area.…”

“…Triniobium hydroxide heptaoxide, Nb 3 O 7 (OH), the special crystalline hydroxide oxides of niobium, has aroused great attention owing to its potential applications in sensors, photocatalysis, solar cells, and so forth. − Moreover, a complementary resistive switching behavior of the hydrothermally grown single crystalline Nb 3 O 7 (OH) nanowires was reported for the first time, which was related to an oxygen vacancy migration at its electrode/metal hydroxide interface . Traditionally, the Nb 3 O 7 (OH) nanostructures/3D superstructures were prepared hydrothermally by treating niobium­(V) chloride in hydrochloric acid at 473–483 K. − A novel Nb 3 O 7 (OH) porous structure was also prepared by a facile one-pot hydrothermal method, employing a K 2 Nb 2 O 6 hollow sphere precursor .…”

“…Triniobium hydroxide heptaoxide, Nb 3 O 7 (OH), the special crystalline hydroxide oxides of niobium, has aroused great attention owing to its potential applications in sensors, photocatalysis, solar cells, and so forth. − Moreover, a complementary resistive switching behavior of the hydrothermally grown single crystalline Nb 3 O 7 (OH) nanowires was reported for the first time, which was related to an oxygen vacancy migration at its electrode/metal hydroxide interface . Traditionally, the Nb 3 O 7 (OH) nanostructures/3D superstructures were prepared hydrothermally by treating niobium­(V) chloride in hydrochloric acid at 473–483 K. − A novel Nb 3 O 7 (OH) porous structure was also prepared by a facile one-pot hydrothermal method, employing a K 2 Nb 2 O 6 hollow sphere precursor . Interestingly, the Nb 3 O 7 (OH) nanostructures/3D superstructures can be transformed into monoclinic H-Nb 2 O 5 via the dehydration process at a low temperature of 723 K, while preserving the morphology and high surface area. ,, The heat-induced phase transformation of Nb 3 O 7 (OH) was further explored at the atomic scale under different atmospheric conditions, revealing that oxygen had a much stronger effect on the phase transformation to yield unusual crystal phases in situ .…”