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Title: Investigations on selenium and copper nanoparticles for biological applications
Researcher: Senthil Kumaran, C K
Guide(s): Agilan, S
Keywords: Biological Applications
Raman spectra
Upload Date: 15-Sep-2014
University: Anna University
Completed Date: n.d.
Abstract: newlineSelenium nanowires and copper dendrite like structured particles newlinehave been prepared by chemical precipitation method Xray diffraction newlineresults show that Se nanowires exhibit hexagonal structure and Cu dendrite newlinelike structure shows facecentered cubic structure The average size of Se newlinenanoparticles lies in the range of 3050 nm The average particle size of Cu newlinenanoparticles was found to be 3698 nm Raman spectra showed a resonance newlinemode at 235 cm for Se and 342 cm 667 cmfor Cu newlineThe surface morphology was studied using scanning electron newlinemicroscope and it shows nanowire structure for Se and dendrite like structure newlinefor Cu respectively Selenium nanowires of several micrometers in length newlinewith diameter ranging from 30 to 50 nm were obtained by annealing at 100 C newlineand 200 C Cactus honeycomb and tubular structures were obtained for Cu newlinenanoparticles annealed at 200C 400C and 600C respectively The nanowire newlineand dendrite like structures of Se and Cu were also confirmed from newlinetransmission electron microscope images The compositional analysis result newlineshows the presence of Se and Cu in the prepared samples The absorption newlinespectra of Se and Cu nanoparticles were redshifted with increase in particle newlinesize with increase in annealing temperature newlineSimulation studies for the prepared selenium and copper newlinenanoparticles are carried out using the abinitio software The densities of newlinestates of the Se nano particles are nearly the same from the LDA and GGA newlinemodel The band gap energy of Se nanoparticle was found to be 168 eV and newline172 eV in LDA and GGA models respectively The effective masses of newlineelectrons and holes of Se nanoparticle is 010004 and 00353 newlineIn case of Cu the valence band and the conduction band in the simulated band newlinestructure are overlapping each other hence the electronic band gap of the face newlinecentred cubic structure is found to be 0 V newlineThe antibacterial effect of asprepared annealed Se 100C and newline200C and Cu 200C 400C and 600C nanoparticles on EColi newlinePseudomonas Bacillus and Staphylococcus bacteria have been analysed newline newline
Pagination: xxiii,186p.
Appears in Departments:Faculty of Science and Humanities

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01_title.pdfAttached File172.51 kBAdobe PDFView/Open
02_certificate.pdf2.78 MBAdobe PDFView/Open
03_abstract.pdf73.14 kBAdobe PDFView/Open
04_acknowledgement.pdf70.82 kBAdobe PDFView/Open
05_contents.pdf191.44 kBAdobe PDFView/Open
06_chapter 1.pdf279.17 kBAdobe PDFView/Open
07-chapter 2.pdf1.44 MBAdobe PDFView/Open
08_chapter 3.pdf2.34 MBAdobe PDFView/Open
09_chapter 4.pdf7.07 MBAdobe PDFView/Open
10_chapter 5.pdf1.61 MBAdobe PDFView/Open
11_chapter 6.pdf172.96 kBAdobe PDFView/Open
12_chapter 7.pdf99.33 kBAdobe PDFView/Open
13_references.pdf204.52 kBAdobe PDFView/Open
14_publications.pdf163.8 kBAdobe PDFView/Open
15_vitae.pdf58.95 kBAdobe PDFView/Open

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