Nb‐Dopant‐Induced Tuning of Optical and Electrical Property of Anatase TiO₂ Nanocrystals

Abstract

For increasing demand of electrochromic smart window, flat panel display synthesis of high quality aliovalent doped wide bandgap semiconductor nanocrystals are gaining interest. In our manuscript we synthesized pure and Nb 5 + doped anatase TiO 2 nanocrystals by colloidal process. On increasing doping percentage size of TiO 2 nanoparticle was found to be decreased. Although pure TiO 2 nanocrystals are terminated with thermodynamically stable {101} facets but Nb 5 + doped TiO 2 was found to be terminated with high energy {103} facet by lowering the surface energy. Successful doping in anatase TiO 2 has been characterized by Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance spectroscopy (EPR) analysis. Aliovalent dopant Nb 5 + generated free carriers in conduction band of TiO 2 . These free electrons results distinct plasmon absorption peak which appeared at wavelength of 1900 nm to 2700 nm. Plasmon peak found to be blue shifted with increase of dopant amount. Broad emission bands correspond to distinct transitions related to intermediate energy levels induced by oxygen vacancy. High colloidaly stable nanocrystals was deposited as crack free transparent conducting oxide thin film where we obtained very low sheet resistance with high optical transparency that leads to good figure of merit of thin film. Temperature driven metalinsulator transition for the lowest resistance film is explained by electron localization origination from random substitution of Nb into TiO 2 nanocrystals.

NaNbO3/ZnO piezocatalyst for non-destructive tooth cleaning and antibacterial activity

“…(Sharma et al, 2022). At the very same moment, the binding energies of 206.55 and 209.32 eV are attributed to Nb 3d 5/2 and Nb 3d 1/2 , which corresponds to the Nb 5+ oxidation state (Saha et al, 2018).…”

“…In the Zn 2p range, the bond energies for Zn 2p 3/2 and Zn 2p 1/2 arise at 1022.26 and 1045.38 eV, respectively, which are compatible with the valence of Zn 2+ ( Sharma et al., 2022 ). At the very same moment, the binding energies of 206.55 and 209.32 eV are attributed to Nb 3d 5/2 and Nb 3d 1/2 , which corresponds to the Nb 5+ oxidation state ( Saha et al., 2018 ). The typical bond energy of 1071.15 eV exhibited by Na 1s, which corresponds to the Na 1+ oxidation state, which is well comparable with published data ( Xu et al., 2011 ).…”

Exploring the catalytic activity of Nb4C3Tx MXene towards the degradation of nitro compounds and organic dyes by in situ decoration of palladium nanoparticles

“…2(c). 41 Another peak corresponding to NbC was found at around 204 eV in the XPS spectrum for Nb 4 C 3 T x and this peak diminishes after the formation of Nb 4 C 3 T x @Pd5 composite. 42…”

Synthesis of Self‐Ordered Tantalum‐Niobium Mixed Oxide Nanotubes and Their Use for Clean Hydrogen Production

“…The XPS spectra of the fabricated Ta−Nb−O NTs are shown in Figure 2b–d. The High resolution spectra of Nb 3d (Figure 2b) exhibit two characteristic peaks at 210.9 and 208.2 eV, which are related to Nb 3d 5/2 and Nb 3d 3/2 , respectively, with a spin‐orbital separation of ∼2.7 eV, confirming the formation of Nb 5+ oxidation state [31–34] . Moreover, the HR‐XPS spectrum of Ta 4 f (Figure 2c), revealing two major doublets located at 28.8 and 27.1 eV, which can be indexed to Ta 4f 5/2 and Ta 4f 7/2 , respectively.…”