Fast microwave‐assisted hydrothermal synthesis of TiNb₂O₇ nanoparticles

Abstract

In this work, a fast method for synthesizing TiNb 2 O 7 nanoparticles was developed by combining colloidal sol-gel and microwave-assisted hydrothermal synthesis. The synthesis conditions and the subsequent thermal treatments were evaluated analyzing their effect on morphological, structural, and photocatalytic properties of the synthesized nanoparticles. The results indicated that the hybrid synthesis requires heating at temperature as low as 180°C for only 10 minutes. Therefore, this process is a feasible alternative method for obtaining nanoparticles with sizes ranging from 10 to 50 nm. Subsequent thermal treatments led to the direct crystallization of the TiNb 2 O 7 in the monoclinic phase, observing a direct correlation between the crystallinity and the photocatalytic activity: the higher the better. K E Y W O R D S microwave-assisted synthesis, nanoparticles, sol-gel, TiNb 2 O 7 How to cite this article: Falk GS, Rodrigues Neto JB, Borlaf M, Gómez SY, Novaes de Oliveira AP, Hotza D. Fast microwave-assisted hydrothermal synthesis of TiNb 2 O 7 nanoparticles. Int J Ceramic Eng Sci.

Microwave‐assisted synthesis and electrochemical characterization of TiNb2O7microspheres as anode materials for lithium‐ion batteries

“…The energy conversion process is considered to enhance the reaction rate of compound formation. Thus, microwave‐assisted synthesis improves the phase purity and crystallinity of TiNb 2 O 7 powders 30,34,36 . The sample is identified to possess the Wadsley–Roth shear structure with C 2/ m space group 36 …”

“…Thus, microwave-assisted synthesis improves the phase purity and crystallinity of TiNb 2 O 7 powders. 30,34,36 The sample is identified to possess the Wadsley-Roth shear structure with C2/m space group.…”

“…In the present context, microwaveassisted synthesis techniques have drawn a lot of interest, especially for the development of nanoparticles. 30,31 However, microwave-assisted solvothermal synthesis for generating TiNb 2 O 7 effortlessly is rarely reported. In this study, a novel microwave-assisted solvothermal method is adopted to develop uniformly distributed spherical particles.…”

“…Therefore, the investigation of an easy and affordable approach to producing TiNb 2 O 7 nanomaterials is very crucial. In the present context, microwave‐assisted synthesis techniques have drawn a lot of interest, especially for the development of nanoparticles 30,31 . However, microwave‐assisted solvothermal synthesis for generating TiNb 2 O 7 effortlessly is rarely reported.…”

Ultrafast reaction‐sintering of grain size‐controlled titanium niobate from TiO2 and Nb2O5

“…Fast firing has recently been applied as a method for TiNb 2 O 7 sintering by Falk et al, 14 using niobium pentachloride and titanium isopropoxide as starting materials with a microwave-assisted hydrothermal treatment for the synthesis, following previous work on microwave-assisted synthesis. 15 However, as presented herein, a versatile solidstate reaction approach to the use of fast-firing to synthesize and sinter TiNb 2 O 7 simultaneously has still not been documented for this and any other oxide.…”