Suppression of near band edge emission in specially engineered ZnO twin nanorods

Physical Chemistry Chemical Physics : PCCP
Avanendra SinghPratap K Sahoo

Abstract

We report the synthesis of a unique zinc oxide nanorod structure in which an amorphous ZnO layer is sandwiched between two identical crystalline segments of ZnO. A simple hydrothermal reaction method was used for this purpose, which allowed us to tune the amorphous and crystalline sections of the nanorods via reaction temperature. A systematic study of the morphology and dimensions of the nanorods grown under various conditions was performed using a combination of scanning and transmission electron microscopy. Transmission electron microscopy (TEM) clearly showed an amorphous separation between the two crystalline segments. UV-vis absorption spectroscopy of the twin nanorods (TNRs) showed a redshift in the optical band gap as a function of the growth duration, indicating slightly stressed growth of the crystalline segments. For a longer growth duration, as the amorphous gap starts to get bridged by crystalline growth, redshift in optical band gap becomes constant. This confirms a true mechanical gap between the two crystalline segments of the nanorods. Temperature dependent photoluminescence (PL) spectra of the TNRs showed a variation in free exciton (FX) emission energy, which fitted very well to a model incorporating lattice ...Continue Reading

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May 16, 2014·Chemistry : a European Journal·Monica DistasoWolfgang Peukert
Jan 13, 2015·Physical Chemistry Chemical Physics : PCCP·Avanendra SinghPratap K Sahoo

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Citations

Feb 13, 2019·Beilstein Journal of Nanotechnology·Rekha BaiHarri Lipsanen

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