Synthesis of well-defined functional crystals by high temperature gas-phase reactions

Abstract

Over the past decades, there have been many synthesis methods on producing well-defined crystals, due to their enormous application potentials in industrial field. Among them, high temperature gas-phase reactions (HTGR) approach may be one of the most promising processes for fabrication of well-defined crystals with controllable structure, size, shape, and composition. This review is focused on the recent progresses in synthesizing well-defined crystalline TiO 2 dominated with, respectively, {001} facets and {105} facets, one-dimensional ZnO and SnO 2 nanorods/nanowires, MoS 2 nanosheets as well as GaP, InP, and GaAs nanowires via HTGR approach. Although these research works were currently carried out on experimental scale, it is worth to note that the industrial importance of this HTGR approach for design and fabrication of well-defined crystals in the future owing to its advantages of continuous and scalable production with controlled dimensions and low cost.

Crystal shape engineering of anatase TiO2 and its biomedical applications

“…A typical kinetically controlled synthetic method of anatase TiO 2 production is the high-temperature gas-phase reaction approach, in a process that usually occurs in a vaporization chamber under inert and reactant gas flows at high temperature. 58 Ohtani and coworkers (using a specially designed reactor) synthesized anatase TiO 2 dominated by {001} facets via a modified gas-phase method. 59 The vapour of TiCl 4 was liberated by bubbling Ar (200 mL min −1 ) into a TiCl 4 solution at 358 K, mixing it with an O 2 stream (1200 mL min −1 ), and fed into a quartz glass tube heated from the outside by an oxyhydrogen flame burner.…”