Characterization and antibacterial capabilities of nanocrystalline CdS thin films prepared by chemical bath deposition |
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| Affiliation: | 1. Department of Zoology, Science College, King Saud University, P. O. Box 2455, Riyadh 11451, Saudi Arabia;2. Electron Microscope and Thin Films Department, National Research Center, El- Behooth Street, 12622 Dokki, Cairo, Egypt;3. Physics Department, Faculty of Science, Taif University, 21974 Taif, P.O. Box 888, Saudi Arabia;4. Spectroscopy Department, Physics Division, National Research Center, El Behooth Str., 12622 Dokki, Cairo, Egypt;1. Physics Department, National Research Center, Dokki, Cairo, Egypt;2. Department of Physics, Faculty of Science and Arts, Aljouf University, Aljouf, Saudi Arabia;3. Thin Film Laboratory, Physics Department, Faculty of Education, Ain Shams University, Cairo, Egypt;1. Universidade Estadual Paulista “Júlio de Mesquita Filho” – UNESP, Programa de Pós-Graduação em Ciência e Tecnologia de Materiais, POSMAT, Bauru, SP, Brazil;2. Universidade Federal do Ceará – UFC, Departamento de Física, Fortaleza, CE, Brazil;3. Universidade Estadual Paulista “Júlio de Mesquita Filho” – UNESP, Departamento de Física, Bauru, SP, Brazil;1. State Key Laboratory of Mechanical Transmission, College of Physics, Chongqing University, Chongqing 401331, China;2. Key Laboratory of Optoelectronic Functional Materials of Chongqing, College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing, Chongqing 401331, China;3. Research Center for Materials Interdisciplinary Sciences, Chongqing University of Arts and Sciences, Chongqing 402160, China;1. Department of BIN Fusion Technology, Chonbuk National University, Jeonju 561-756, Republic of Korea;2. Department of Polymer Science and Engineering, Hannam Universtiy, Daejeon 305-811, Republic of Korea;3. Department of Microbiology and Genetics, Medical School, Chonbuk National University, Jeonju 561-180, Republic of Korea;4. Department of Chemistry (Affiliated to Tribhuvan University), Kailali Multiple Campus, Dhangadhi, Kailali, Nepal;5. Department of Organic Materials and Fiber Engineering, Chonbuk National University, Jeonju 561-756, Republic of Korea;6. Department of Chemistry, Inha University, 100 Inharo, Incheon 402-751, Republic of Korea;1. Centre for Research in Nanoscience and Nanotechnology (CRNN), Kolkata, 700098, India;2. Department of Electronic Science, University of Calcutta, Kolkata, 700009, India;3. Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, Innovis, #08-03, 138634, Singapore |
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| Abstract: | Antibacterial capabilities of nanocrystalline cadmium sulfide (CdS) thin films have been developed against Gram-positive and Gram-negative bacteria in dark and sunlight at 60 °C. For this purpose, a strain of Gram-positive Staphylococcus aureus, and two strains of Gram-negative bacteria (Pseudomonas aeruginosa, and Escherichia coli) were used. The nanocrystalline CdS thin films have been prepared using a chemical bath deposition (CBD) method at different thicknesses (50, 80 and 100 nm). The different deposition parameters including the speed of rotation of substrate, temperature of chemical bath, pH of solution and time of the deposition were optimized. The Polyvinylpyrrollidone (PVP) was successfully used as capping agent in order to stop the agglomeration in the CdS thin films. It was found that, CdS thin films have remarkable antibacterial activity in dark and sunlight and it could be applied as antimicrobial agent in medical field. In order to confirm the crystalline structure of CdS thin films, the polycrystalline nature of the deposited CdS thin films with hexagonal structure was obtained. Furthermore, the structural parameters including lattice parameters, cell volume, the space group, average grain size, dislocation density and the strain have been calculated. The topography and surface roughness of the CdS thin films have been studied before and after the bacteriostatic effect using Scanning Electron Microscopy (SEM). Furthermore, the compositions of nanocrystalline CdS thin films have been evaluated using Energy Dispersive X-ray emission (EDX) and a Transmission Electron Microscope (TEM). Based on the optical measurements in the range of 300–2500 nm, the band gap energy of the prepared CdS thin films was found to be 2.4 eV. |
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| Keywords: | CdS nonocrystalline Chemical bath deposition Antibacterial capability Optical properties |
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