Nanosized CdSe Particles Synthesized by an Air Pressure Solution Process Using Ethylene‐Glycol‐Based Solvent

Abstract

Nanosized CdSe particles were synthesized at a temperature of 1151-1751C by a solution method with air pressure condition. Ethylene glycol (EG) was used as the main solvent and sodium selenite and cadmium nitrate-tetrahydrate as inorganic sources. The influence of refluxing temperature and time on growth morphology and crystallization was investigated by transmission electron microscope, high-resolution transmission electron microscope, and X-ray diffraction. The chemical reaction was deducted based on X-ray photoelectron spectra. The optical absorption property was measured by UV-vis. The CdSe nanoparticles synthesized through this EG solvent system was single wurtzite crystallization and had a nanoscale size below 15 nm diameter with a narrow size distribution. The reduction of Se 41 -Se 0 -Se 2À and the disproportionation of Se 0 occurred during the synthetic process and dominated the chemical reaction.

A Green and Air Pressure Solution Synthesis of CuInSe2 Nanocrystals Using 1-methyl-2-Pyrrolidinone as Hot Solvent

“…The peak intensity at 53.7 eV as the deoxidized state of selenium(Se 2− ) was gradually enhanced, indicating the evolution of CuInSe 2 formation. The Se reduction during the reaction process was Se 4+ →Se 0 →Se 2− 44 …”

Sonochemical Synthesis, Characterization and Optical Properties of Tb-Doped CdSe Nanoparticles: Synergistic Effect between Photocatalysis and Sonocatalysis

“…The specimens diffraction peaks are indexed readily to pure characteristic well-crystallized hexagonal CdSe ((No. 08-0549, a = 0.4299 nm, space group P63mc, and c = 0.7010 nm) [ 30 , 31 , 32 ]. There was no peak revealing impurities, which confirmed the effectiveness of the sonochemical route to synthesize the preferred specimens.…”

“…The narrow scan XPS and XPS spectrum of Tb 0.08 Cd 0.92 Se nanoparticles are shown in Figure 5 a–d. The narrow scan spectra of Cd 3d in Figure 5 b shows two peaks centered at 412 and 405 eV, which can be associated with the transition of respectively Cd 3d3/2 and Cd 3d5/2 [ 30 ]. The single peak placed at a binding energy of 54.58 eV is associated with the Se 3d transition (see Figure 5 c) [ 31 ].…”