Theoretical and Computational Analysis of Confinement Regimes in Spherical ZnO, CdS, and CdSe Colloidal Quantum Dots | Chapter 7 | Current Research Progress in Physical Science Vol. 7

Quantum dots (QDs) exhibit unique optical and electronic properties due to quantum confinement effects, making them promising candidates for various applications. This study investigates the confinement regimes of colloidal spherical ZnO, CdS, and CdSe quantum dots through computational simulations and theoretical analysis. Confinement regimes were delimited for each of the quantum dots based on the exciton Bohr radius of carriers of the respective semiconductor. The results delineate size-dependent confinement effects, revealing critical size ranges for strong, intermediate, and weak confinement regimes and their associated energy levels. These findings provide valuable insights into optimising quantum dot performance for applications in optoelectronics, field-effect transistors, and photonic technologies, advancing the understanding of these semiconductor nanostructures.

 

Author (s) Details

 

Harry, S. T.
Department of Physics, Ignatius Ajuru University of Education, Rumuolumeni, Port-Harcourt, Nigeria.

 

Please see the book here:- https://doi.org/10.9734/bpi/crpps/v7/4090

Study of the Optical Properties, Characterization and Synthesis of Cadmium Sulphide Embedded in Polyaniline Matrix | Chapter 1 | Advances and Challenges in Science and Technology Vol. 7

 Nanotechnology, frequently shortened to nanotech, is the use of matter on nuclear, molecular, and supramolecular scales for modern purposes. The earliest, extensive description of nanotechnology referred to the indicated technological aim of precisely maneuvering atoms and molecules for lie of macroscale products, still now refer to as molecular nanotechnology. The synthetic oxidative polymerization of aniline using ammonium peroxodisulphate as an inventor and the presence of cadmium sulphide nanoparticles has been used to found polyaniline-cadmium sulphide nanocomposite. In order to characterize the fabrics' structural, warm, and optical characteristics, TEM, SEM, XRD, TGA, DSC, UV-Vis spectroscopy, and photoluminescence experiments were carried out on the samples. The piece size of nanocomposites display or take public between 6-10 nm. XRD range shows that polyaniline is amorphous, but peaks present in the range of polymer nanocomposites are for cadmium sulphide nanoparticles. TGA and DSC result shows that nanocomposite is more thermally stable. An enhancement in photoluminescence has happened observed in the nanocomposite than that in clean polyaniline.

Author(s) Details:

M. Goswami,
Department of Basic Science & Humanities, Sanaka Educational Trust’s Group of Institutions, Durgapur, Durgapur-713212, West Bengal, India.

S. Layek,
Department of Civil Enginering, Sanaka Educational Trust’s Group of Institutions, Durgapur-713212, West Bengal, India.

R. Ghosh,
CSIR, Central Mechanical Engineering Research Institute, Durgapur-713209, West Bengal, India.

A. K. Meikap,
Department of Physics, National Institute of Technology, Durgapur –713209, West Bengal, India.

Please see the link here: https://stm.bookpi.org/ACST-V7/article/view/12198

Preparation and Electrical Properties of Polyaniline-MWCNT-CdS Nanocomposites | Chapter 11 | Advanced Aspects of Engineering Research Vol. 10

 The chemical oxidative polymerization reaction was used to create a polyaniline-CNT-CdS nanocomposite. Nanocomposites have particle sizes ranging from 2.5 to 4.9 nanometers. Within the temperature range of 77T300K, the dc electrical transport property of Polyaniline-CNT-CdS nanocomposites was investigated. The 3D variable range hopping (VRH) model is used to calculate the dc conductivity. The nanocomposite's I-V characteristics display a nonlinear pattern.

Author (s) Details

Mrinmoy Goswami
Department of Physics, Sanaka Educational Trust’s Group of Institutions, Durgapur, Durgapur-713212, West Bengal, India

Ranajit Ghosh
CSIR, Central Mechanical Engineering Research Institute, Durgapur-09, West Bengal, India

Ajit Kumar Meikap
Department of Physics, National Institute of Technology, Durgapur, Durgapur –71309, West Bengal, India

View Book :- https://stm.bookpi.org/AAER-V10/article/view/760