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  4. Structural and spectroscopic comparison between polycrystalline, nanocrystalline and quantum dot visible light photo-catalyst Bi 2 WO 6
 
Zitierlink DOI
10.26092/elib/9

Structural and spectroscopic comparison between polycrystalline, nanocrystalline and quantum dot visible light photo-catalyst Bi 2 WO 6

Veröffentlichungsdatum
2017-10
Autoren
Teck, Michael  
Murshed, Mohammad Mangir  
Schowalter, Marco  
Lefeld, Niels  
Grossmann, Henrike K.  
Grieb, Tim  
Hartmann, Thomas  
Robben, Lars  
Rosenauer, Andreas  
Mädler, Lutz  
Gesing, Thorsten M.  
Zusammenfassung
The structural and spectroscopic features of the visible light photocatalyst Bi2WO6 have been studied. Polycrystalline (PC), nanocrystalline (NC) and quantum dot (QD) sized samples were produced using solid state reaction, hydrothermal and flame spray pyrolysis methods, respectively. While the crystal structures of PC and NC Bi2WO6 are well characterized using X-ray powder diffraction data Rietveld refinements, the structural information of the QD are obtained from the complementary pair distribution function analysis and high-resolution transmission electron microscopy. The Raman spectra of the samples are compared with the phonon density of states calculated by DFT. A continuous phenomenological model describes selective optical phonon confinement into the QDs. The type of the electronic bandgaps obtained from the UV-VIS absorbance-spectra have been analyzed using two different methods, and compared with those calculated from the electronic band structures.
Schlagwörter
Bismuth tungstate

; 

X-ray diffraction

; 

Pair distribution function

; 

Ramen

; 

UV-VIS

; 

HRTEM, strain state analysis, GaN, pyramidal defects, InGaN islands, quantum dots

; 

DFT
Institution
Universität Bremen  
Fachbereich
Fachbereich 02: Biologie/Chemie (FB 02)  
Dokumenttyp
Artikel/Aufsatz
Zeitschrift/Sammelwerk
Journal of Solid State Chemistry  
Startseite
82
Endseite
89
Zweitveröffentlichung
Nein
Sprache
Englisch
Dateien
Lade...
Vorschaubild
Name

124_Post.pdf

Description
Postprint
Size

1.2 MB

Format

Adobe PDF

Checksum

(MD5):187cb304449b190cefd44338d49c08b9

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