Core–shell Zn₂GeO₄nanorods and their size-dependent photoluminescence properties

Abstract

Size-tunable crystalline core-crystalline shell Zn2GeO4 nanorods were synthesized via a facile hydrothermal reaction. High purity Zn2GeO4 nanorods were obtained at pH = 7. The length of Zn2GeO4 nanorods (L = 50-100 nm) can be controlled through a one-step process, while micro-sized nanorods with an aspect ratio of the length to the diameter of 10 were yielded in a two-step process. The single crystalline nature of Zn2GeO4 nanorods with a core-shell structure was verified by high resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED) measurements. The Raman study revealed that there is no oxygen defect in Zn2GeO4 nanocrystals, suggesting that photoluminescence emission of Zn2GeO4 can be attributed to the presence of the interstitial Zn defect in Zn2GeO4 nanocrystals. As the diameter of nanorods decreased, the excitation and emission peaks appeared to be redshifted due to the quantum size effect.

Zn2GeO4@C Core–Shell Nanorods as Highly Reversible Anode Materials for Lithium‐Ion Batteries

“…As observed, the absorption ranges of bare Zn 2 GeO 4 nanostructures are located at approximately 530 cm −1 and 700–800 cm −1 (inset image, Figure d), which agrees with a previous report . The peak at 754 cm −1 suggests some oxygen defects in the Zn 2 GeO 4 nanostructures, as reported in Ref.…”

Efficient white-light emission from Zn2GeO4 nanomaterials

“…Concerning the UV emission, a clear shift to higher energies is detected by recording polarized light parallel to the microwire axis. Some authors have indicated that Zn i donors are not essential in the emissions around 480-600 nm [12] . However, they could influence the UV emission.…”

“…Over the past few years, a variety of synthesis routes have been explored for the synthesis of Zn 2 GeO 4 nano/microstructures, including conventional solid-state reaction [5] , vapor growth techniques [11] and aqueous processes [12] . In this work, undoped and Mg doped Zn 2 GeO 4 nano-and microrods have been grown by a catalyst free thermal evaporation method and their luminescence and waveguiding properties have been investigated.…”

The synthesis and fast ethanol sensing properties of core–shell SnO2@ZnO composite nanospheres using carbon spheres as templates

“…23,24 In aqueous solution, CTAB forms a large number of micelles. 23,24 In aqueous solution, CTAB forms a large number of micelles.…”

“…23,24 In aqueous solution, CTAB forms a large number of micelles. 24 Under continuous mixing and hydrothermal conditions, SnO 2 NSs were used as the core and these worm-like micelles broke into short cylindrical micelles. 25 While a solution of 8.2 mM CTAB was obtained in this experiment, worm-like micelles were dominant instead of spherical micelles at a higher concentration of CTAB (c CTAB 4 critical micellar concentration (CMC), CMC E 1 mM).…”