Passivated ZnSe nanocrystals prepared by hydrothermal methods and their optical properties

Abstract

Homogeneous ZnSe nanocrystals were prepared via surfactant-assisted hydrothermal method. Surfactants agent CTAB was used to control the particle morphology and the growth rate. The structure, morphology and optical properties of ZnSe nanocrystals have been investigated by XRD, TEM and luminescence spectroscopy. The results indicated that the size of ZnSe nanocrystals ranged from 3.0 nm to 5.0 nm with cubic zinc blende structure. ZnSe nanocrystals coated by CTAB were revealed high dispersibility and distribution under TEM. Compared to the bulk ZnSe, the absorption edges and photoluminescence peaks of ZnSe nanocrystals were blue shifted to higher energies due to the quantum confinement effect. The emission intensity was strengthened after coated CTAB compared to bare sample. This was mainly due to the surface passivation. Meanwhile, we simply explored the formation mechanism of ZnSe nanocrystal in hydrothermal system.

Size-controlled growth of ZnSe nanocrystals for high-performance photocatalytic H2O2 production in pure water

“…6a, the production of H 2 O 2 was the most efficient in the O 2 -saturated suspension, clearly decreased in the air-bubbling suspension, and nearly fully inhibited in the N 2 -bubbling suspension. This behavior agrees well with the previous studies in that the production of H 2 O 2 is consistent with the content of O 2 , 53,[65][66][67] indicating that external O 2 is the main O 2 source for the H 2 O 2 production. The addition of IPA as the sacrificial agent in this experiment shows little influence on the tendency.…”

“…The E g values, especially for ZS4K40, are significantly red-shifted compared with the reported value (2.7 eV). 53,54 The Mott-Schottky plot in Fig. 5b was employed to decide the energy-band structure of the prepared ZnSe nanocrystals.…”

Controlled Synthesis of NiO and Co3O4 Nanoparticles from Different Coordinated Precursors: Impact of Precursor’s Geometry on the Nanoparticles Characteristics

“…This is occurring, as it is known that the optical properties of nanoparticles are highly dependent on their size. Smaller nanoparticles have peaks shifted toward shorter wavelengths (known as blue-shifting) …”

Embedding plasmonic nanoparticles in soft crystals: an approach exploiting CTAB–I structures

“…[18][19][20] It has also been explored as a shape-control agent in syntheses involving semiconductors. 21 More recent studies have emphasized the usage of CTAB mesophases as well as gels for NP synthesis. 22,23 The extension of the utility of CTAB as a convenient substrate for the preparation of nanoparticle-incrystal architectures is thus a signicant advance.…”