High-Quality Luminescent Tellurium Nanowires of Several Nanometers in Diameter and High Aspect Ratio Synthesized by a Poly (Vinyl Pyrrolidone)-Assisted Hydrothermal Process

Abstract

Large-scale selective synthesis of uniform single crystalline tellurium nanowires with a diameter of 4-9 nm, and microbelts with a width of 250-800 nm and tens of micrometers in length, can be realized by a poly (vinyl pyrrolidone) (PVP)-assisted hydrothermal process. The formation of tellurium nanowires and nanobelts in the presence of PVP is strongly dependent on the reaction conditions such as temperature, the amount of PVP, and reaction time. The results demonstrated that the keys for selective synthesis of Te nanobelts and nanowires are to modulate the growth rates of (100), (101), and (110) planes in the presence of PVP and to precisely control the reaction kinetics. High-quality luminescent ultrathin t-Te nanowires with a diameter of 4-9 nm display strong luminescent emission in the blue-violet region. This approach provides a facile route for the production of high-quality tellurium nanostructures with an interesting optical property. Furthermore, the synthesized ultrathin nanowires with deep blue color and nanobelts in gray color by this approach can be well dispersed in water or ethanol, making it possible for further engineering of their surfaces to prepare other hybrid core-shell nanostructures.

Carbonaceous Nanofiber Membranes for Selective Filtration and Separation of Nanoparticles

“…[ 25 ] The well-defi ned Te@C nanocables were obtained by the so-called hydrothermal carbonization (HTC) process from Te nanowires and glucose. [ 26 , 27 ] Removal of the Te cores by chemical etching in a 5% H 2 O 2 solution resulted in the formation of pure ultralong CNFs with uniform diameter (see the Supporting Information (SI) for details).…”

Synthesis and Characterization of High-Purity Bismuth Nanowires via Seed-Assisted Growth Approach

“…To prevent the nanowires from aggregating, the surfactant PVP was used to chemically adsorb onto the surfaces of bismuth nanowires by O-Bi bonding. 23 Many reports 18,24,25 have indicated that PVP had the functions of controlling the growth rates of different crystalline faces and assisting in fabricating the nanowires. However, our work indicates that both nanoparticles and nanowires had been synchronously formed in the assistance of PVP in the lack of bismuth seeds.…”

Cytotoxic Potentials of Tellurium Nanowires in BALB/3T3 Fibroblast Cells

“…These values are close to the reported values for Te nanowires. [20][21][22] The first peak at 270 nm is assumed to result from the allowed transition from the valence band to the conduction band and the second peak at 630 nm can be assigned to a forbidden direct transition. 23 We conducted time-dependent observation of absorption spectra of Te nanowires suspended in the DMEM medium alone and the DMEM growth medium separately.…”