Size- and Surface-Determined Transformations: From Ultrathin InOOH Nanowires to Uniform c-In₂O₃ Nanocubes and rh-In₂O₃ Nanowires

Abstract

Ultrathin InOOH nanowires with a diameter of approximately 2 nm and a length up to approximately 200 nm have been synthesized by a hydrolysis reaction in a solution system. Their transformations to c-In(2)O(3) nanocrystals and rh-In(2)O(3) nanowires have been investigated. A dissolution-recrystallization (in solution) or size-related decomposition-recrystallization (in air) mechanism is indicated for the former transformation; the size- and surface-determined transformation is proposed for the latter. These results will help to understand and control the phase stability and transformation concerning the nanodimension and surface restrictions, especially for ultrathin nanowires.

Self‐Assembled α‐Fe2O3 Mesocrystals/Graphene Nanohybrid for Enhanced Electrochemical Capacitors

“…The XRD pattern and TEM image of the products reveals the formation of short rod‐like α‐Fe 2 O 3 mesocrystals on graphene sheets with an crystalline domain size of 11 nm estimated by Scherer equation (Figure S7d, SI) and sufficient structural defects indicated by the dotted circles in the single α‐Fe 2 O 3 mesocrystals (Figure f and Figure S2a, b in SI). It can be found that the edges of α‐Fe 2 O 3 iso‐oriented mesocrystals become rounded due to the Ostwald ripening mechanism . Additionally, the coexistence of both FeOOH and α‐Fe 2 O 3 , confirming that the transfer reaction from FeOOH precursor to α‐Fe 2 O 3 was incomplete, was also observed at the reaction time of 12 h. A HRTEM image taken from two adjacent areas in a mesocrystal is presented in Figure S8c in the SI.…”

Monodispersed In2O3 mesoporous nanospheres: One-step facile synthesis and the improved gas-sensing performance

“…The FT-IR spectrum of the synthesized In 2 O 3 mesoporous spheres is shown [ 47,48]. This result reveals that relatively pure sample is obtained with this route.…”

Enhanced photocatalytic hydrogen generation of nano-sized mesoporous InNbO4 crystals synthesized via a polyacrylamide gel route

“…3A), the weak band at 1639 and 2358 cm −1 and broad band at 3445 cm −1 observed in all samples can be assigned to the stretching and bending modes of O-H bands [33,34]. The bands at 442 cm -1 are In-O feature modes [34][35], and the bands at 535, 602, and 785 cm -1 are Nb-O feature modes [35,36]. It is noticeable that there are no bands in the spectra assigned to the organic compounds, revealing that organic additives were completely burned off under the temperature of 600 °C, which was further confirming by TG/DSC analysis as shown in Fig.…”