Structure, optical and electronic characteristics of iron-doped cadmium sulfide under nonambient atmosphere

Abstract

Iron-doped nano CdS was prepared in air and underflow of nitrogen applying the thermolysis technique. The impact of air and nitrogen atmosphere on the crystallinity and the different structure parameters of the obtained samples was investigated using X-ray diffraction measurements and applying Rietveld method. Analysis revealed the presence of two phases for CdS; hexagonal wurtzite and cubic zincblende with phase percentages greatly affected with preparation conditions; sample obtained under N 2 is almost pure hexagonal (97%). The particle morphology was investigated by FE-SEM, and the associated EDS spectra manifested elements percentages in accordance with those intended for preparation. The optical bandgap was greatly affected; compared with samples formed in air, it reduced upon doping with Fe as well as upon preparation under N 2 , it decreased from 2.58 eV for pristine CdS to 1.99 eV for Fe-doped CdS under N 2 . The photoluminescence (PL) intensity was also affected by the condition of preparation and iron doping. Pure and Fe-doped CdS samples emitted violet and blue colors. Density function theory (DFT) calculations were performed to explain the reason for the reduction of the optical bandgap upon doping CdS with Fe. The comparison between different electronic characteristics of pure and Fe-doped CdS samples was explored also by DFT calculation.

Type-I CdS/ZnS Core/Shell Quantum Dot-Gold Heterostructural Nanocrystals for Enhanced Photocatalytic Hydrogen Generation

“…An additional broad Bragg diffraction peak at 2θ of around 32.6°–33.0° was observed for all three QD-Au HNC samples, which can be assigned to the (111) crystal plane of the Au crystalline domains. , Only one clear diffraction peak of Au domains (i.e., Au(111)) can be resolved due to their small sizes . The calculated d -spacings of 2.74 Å (QD-Au 1.6 ), 2.73 Å (QD-Au 2.2 ), and 2.71 Å (QD-Au 3.3 ) suggested noticeable Au lattice expansions of 16.1%, 15.7%, and 14.8% for the (111) crystal plane, respectively (Tables S3–S6), as a result of the large lattice mismatch between QD host materials (CdS: a CdS = 5.88 Å; ZnS: a ZnS = 5.41 Å) and Au domain lattices (Au: a Au = 4.08 Å). ,, …”

Effect of Ag/CuS nanoparticles loading to enhance linear/nonlinear spectroscopic and electrical characteristics of PVP/PVA blends for flexible optoelectronics

“…Enhancement of the DC‐electrical conductivity of PVP/PVA blend via doping of ACS nano fillers is one of the main aims of the current work. Electrical conductivity relates mainly to transportation of charges carriers within materials 1,64,65 . The role of ACS content adding in PVP/PVA blend on DC‐electrical conductivity and activation energy has been examined to suggest their possible applications.…”

“…Electrical conductivity relates mainly to transportation of charges carriers within materials. 1,64,65 The role of ACS content adding in PVP/PVA blend on DC-electrical conductivity and activation energy has been examined to suggest their possible applications. The I-V measurements of ACS PNCs were collected via sweeping temperature (T) in the range from 300 to 400 K. The calculated resistivity (ρ ¼ R:A=d) versus T is presented in Figure 11A.…”

Effect of vanadium doping on the structural and optical characteristics of nano ZnCdS

“…Nano semiconductor materials exhibited different properties as compared with their bulk counterpart; therefore, they are applied in many optoelectronic applications [1][2][3][4][5]. Zinc and cadmium sulfides (ZnS and CdS) materials belong to II-VI groups which possess unique characteristics that may apply in many fields [4,5]. ZnS and CdS displayed good adaptability to alter its structural, electronic, magnetic, electric, and optical features [4,5].…”

“…Zinc and cadmium sulfides (ZnS and CdS) materials belong to II-VI groups which possess unique characteristics that may apply in many fields [4,5]. ZnS and CdS displayed good adaptability to alter its structural, electronic, magnetic, electric, and optical features [4,5]. Zn and Cd binary metal sulfides have become a very favorable hydrogen evolution photocatalyst [6].…”