Structural and optical characterization of potassium doped zinc oxide nanosheets

Athma, P.V.; Johns, N.; Anila, E.I.; Safeera, T.A.

doi:10.1016/j.optmat.2014.10.034

Cited by 9 publications

(2 citation statements)

References 27 publications

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“…The triangles are about 2.5 μm in height. Several authors [ 15 , 17 , 34 ] have shown the appearance of plates with marked angles when doping with potassium, with a clear similarity to our structures. As already mentioned, potassium can occupy different positions within the ZnO lattice.…”

Section: Resultssupporting

confidence: 86%

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Optical Properties of 2D Micro- and Nanostructures of ZnO:K

et al. 2022

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ZnO nano- and microstructures doped with K were grown by the Vapor–Solid method. Wires and needles are the main morphology observed, although some structures in the form of ribbons and triangular plates were also obtained. Besides these, ball-shaped structures which grow around a central wire were also detected. Raman and cathodoluminescence investigations suggest that variations in morphology, crystalline quality and luminescence emissions are related to the different lattice positions that K occupies depending on its concentration in the structures. When the amount is low, K ions mainly incorporate as interstitials (Ki), whereas K occupies substitutional positions of Zn (KZn) when the amount of K is increased. Electron Backscattered Diffraction shows that ribbons and triangular plates are oriented in the (0001) direction, which indicates that the growth of this type of morphologies is related to distortions introduced by the Ki since this position favors the growth in the (0001) plane. In the case of the ball-shaped structures, the compositional analysis and Raman spectra show that they consist of K2SO4. Finally, the capability of the elongated structures to act as waveguides and optical resonators was investigated. Due to the size of the K ion, practically double that of the Zn, and the different positions it can adopt within the ZnO lattice (Ki or KZn), high distortions are introduced that compromise the resonators performance. Despite this, quality factor (Q) and fineness (F) show acceptable values (80 and 10 at 544 nm, respectively), although smaller than those reported for doping with smaller size alkali, such as Li.

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Section: Resultssupporting

confidence: 86%

“…The M sample, as described, presents some asymmetry in the UV band due to weak contributions in the blue range. These contributions are associated with emissions related to V Zn [ 42 ] and K Zn [ 34 ], so a rise in the intensity of these bands is expected by increasing the amount of potassium incorporated [ 3 , 4 , 17 , 43 ].…”

Section: Resultsmentioning

confidence: 99%