Large-Scale Synthesis and Growth Mechanism of Single-Crystal Se Nanobelts

Abstract

Single-crystal trigonal (t) Se nanobelts have been synthesized on a large scale by reducing SeO 2 with glucose at 160 °C. Electron microscopy images show that the nanobelts are ∼80 nm in diameter, ∼25 nm in thickness, and up to several hundreds of micrometers in length. HRTEM images prove that the nanobelts are single crystals and preferentially grow along the [001] direction. The time-dependent TEM images revealed that the formation and growth of t-Se nanobelts were governed by a solidsolution-solid growth mechanism. The redox reaction directly produced amorphous (R) Se nanoparticles under hydrothermal conditions. t-Se nanobelts were formed by dissolution and recrystallization of the initial R-Se nanoparticles under the functional capping of poly(vinylpyrrolidone) (PVP). The nanobelts obtained exhibit a quantum size effect in optical properties, showing a blue shift of the band gap and direct transitions relative to the values of bulk t-Se.

Biosynthesis and structural characteristics of selenium nanoparticles by Pseudomonas alcaliphila

“…Xie has reported a new approach to synthesize Se nanobelts with a diameter of ca. 80 nm and a length of 5 m on a large scale under room temperatures [11]. Quintana has reported a method to synthesize selenium nanoparticles of 120 nm in size by pulsed laser ablation [12].…”

Synthesis of Monodisperse Selenium Nanospheres and Self-assembled Monolayers Using Poly(vinyl pyrrolidone) as Dual Reductant/colloid Stabilizer

“…A similar trend has been observed in a previous study on Se using a somewhat different synthetic approach. 9 In summary, selenium nanospheres and nanowires were prepared by the reaction of selenious acid with PVP and thus synthesized nanoparticles were stable at room temperature for more than several months. Unlike in the previous studies, no chemical reductant was deployed other than PVP and nanowires could be prepared without a liquid-liquid interface (c.f., Ref.…”

“…6 In previous studies, such materials have been prepared by the chemical reduction of selenious acid by sodium borohydride, 7 ascorbic acid, 3 hydrazine, 6,8 or glucose. 9 However, two studies more pertinent to the present one, report the large-scale synthesis and growth mechanism of single crystal Se nanobelts 9 and the crystallization and shape evolution of single crystal Se nanorods at a liquid-liquid interface. 8 In both studies, PVP was used in addition to a chemical reductant.…”

Synthesis of manganese vanadate nanobelts and their visible light photocatalytic activity for methylene blue

“…[27] In the present hydrothermal solution, PVP molecules are present as the structure-directing agent and the long polymeric chains are selectively adsorbed on the [26À28] The behaviour significantly affects the diffusion rate of various faces and the epitaxial growth of the manganese vanadate nanosheets. The different diffusion rate on the growth surface of the manganese vanadate nanosheets determines the growth rate of various planes and leads to the formation of the manganese vanadate nanobelts.…”