Effect of Sodium Hydroxide Concentration in Synthesizing Zinc Selenide/Graphene Oxide Composite via Microwave-Assisted Hydrothermal Method

Abstract

The effect of NaOH solution on the formation of nanoparticles has been the subject of ongoing debate in selenium-based material research. In this project, the robust correlation between the mechanistic growth of zinc selenide/graphene oxide (ZnSe/GO) composite and the concentration of NaOH are elucidated. The ZnSe/GO composite was synthesized via microwave-assisted hydrothermal method and the concentrations of NaOH are controlled at 2 M, 3 M, 4 M, 5 M and 6 M. The XRD spectra show that the crystal phases of the samples exhibited a 100% purity of ZnSe when the concentration of sodium hydroxide (NaOH) was set at 4 M. The further increase of NaOH concentration leads to the formation of impurities. This result reflects the essential role of hydroxyl ions in modifying the purity state of ZnSe/GO composite. The optical band gap energy of ZnSe/GO composite also decreased from 2.68 eV to 2.64 eV when the concentration of NaOH increased from 2 M to 4 M. Therefore, it can be concluded that the optimum concentration of NaOH used in synthesizing ZnSe/GO composite is 4 M. This project provides an alternative green method in the formation of a high purity ZnSe/GO composite.

Bactericidal Activity of Silver Nanoparticles on Oral Biofilms Related to Patients with and without Periodontal Disease

“…In the synthesis of the larger AgNPs, ammonium hydroxide caused faster reaction kinetics, having a promotion of hydrolysis, favoring the formation of particles of larger size [ 51 ] with more stable sizes [ 50 , 52 ]. As for 5.4 nm AgNP, the addition of sodium hydroxide promoted a sudden temperature gradient that resulted in rapid nucleation, thus inhibiting the growth of the particles [ 53 , 54 ] and limiting the particle agglomeration associated with the electrical charge [ 41 , 55 ]. Despite those reports, some variations might occur during the synthesis process.…”

Surface Reconstruction of La0.5Sr0.5CoO3-δ Ceramic toward High Solar Selectivity for High-Temperature Air-Stable Solar–Thermal Conversion

“…42−44 Solvent in a hydrothermal environment could enhance the solubility of reactants, which was essential for facilitating reaction and crystal growth. 45 Acids, alkaline, and organic solvents were commonly used as solvent in the hydrothermal process. 46 In addition, mineralizers including NaOH, KOH, and NaBF 4 , which played a crucial role in the hydrothermal process, could influence the morphology, size, and crystallinity of the products.…”

Rapid Fabrication of Large-Area Concave Microlens Array on ZnSe

“…It cannot be ruptured under normal mechanical pressure or impact. Due to its excellent chemical and physical properties, ZnSe has been widely used in solar cells, lasers, logic gates, flat panel displays and transistors [ 12 , 13 , 14 , 15 ]. Recently, ZnSe has garnered tremendous interest because of its valuable potential for both basic physical research and applications in micro-nano component construction.…”