Cadmium sulfide quantum dots stabilized by castor oil and ricinoleic acid |
| |
| Institution: | 1. Department of Chemistry, University of Dar Es Salaam, P.O. Box 35061, Dar Es Salaam, Tanzania;2. Department of Chemistry, University of Zululand, Private Bag X1001, Kwa-Dlangezwa 3886, South Africa;1. Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel;2. Institute for Theoretical Physics, University of Leipzig, Vor dem Hospitaltore 1, D-04103 Leipzig, Germany;3. Department of Physics, Harvard University, Cambridge, MA 02138, USA;1. MOE Key Laboratory for Non-Equilibrium Synthesis and Modulation of Condensed Matter, Department of Applied Physics, Science of School, Xi''an Jiaotong University, Xi''an 710049, China;2. School of Physics and Telecommunication Engineering, Shaanxi University of Technology, Hanzhong 723001, China;1. Shahrekord University of medical Sciences, Shahrekord, Iran;2. Faculty of Advanced Sciences and Technologies, University of Isfahan, Isfahan, Iran;3. Mechanical Engineering Group, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran;4. Physics Department, Shiraz University, Shiraz 71454, Iran;1. Department of Dermatology, Heinrich-Heine University, Düsseldorf, Germany;2. Department of Dermatology, Sourasky Medical Center, Tel Aviv, Israel |
| |
| Abstract: | Castor oil and ricinoleic acid (an isolate of castor oil) are environmentally friendly bio-based organic surfactants that have been used as capping agents to prepare nearly spherical cadmium sulfide quantum dots (QDs) at 230, 250 and 280 °C. The prepared quantum dots were characterized by Ultra violet–visible (UV–vis), Photoluminescence (PL), Transmission Electron Microscopy (TEM), High Resolution Transmission Electron Microscopy (HRTEM) and X-ray diffraction (XRD) giving an overall CdS QDs average size of 5.14±0.39 nm. The broad XRD pattern and crystal lattice fringes in the HRTEM images showed a hexagonal phase composition of the CdS QDs. The calculated/estimated average size of the prepared castor oil capped CdS QDs for various techniques were 4.64 nm (TEM), 4.65 nm (EMA), 5.35 nm (UV–vis) and 6.46 nm (XRD). For ricinoleic acid capped CdS QDs, the average sizes were 5.56 nm (TEM), 4.78 nm (EMA), 5.52 nm (UV–vis) and 8.21 nm (XRD). Optical properties of CdS QDs showed a change of band gap energy from its bulk band gap of 2.42–2.82 eV due to quantum size confinement effect for temperature range of 230–280 °C. Similarly, a blue shift was observed in the photoluminescence spectra. Scanning electron microscope (SEM) observations show that the as-synthesized CdS QDs structures are spherical in shape. Fourier transform infra-red (FTIR) studies confirms the formation of castor oil and ricinoleic acid capped CdS QDs. |
| |
| Keywords: | Cadmium sulfide Castor oil Ricinoleic acid Effective mass approximation (EMA) |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
