Time dependent growth of ZnO nanoflowers with enhanced field emission properties |
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| Affiliation: | 1. Promising Centre for Sensors and Electronic Devices (PCSED), Najran University, P.O.Box-1988, Najran 11001, Saudi Arabia;2. Department of Chemistry, College of Science and Arts, Najran University, P.O. Box-1988, Najran 11001, Saudi Arabia;3. Department of Physics, Faculty of Science, King Khalid University, P.O. Box-9004, Abha 61413, Saudi Arabia;4. Department of Physics, College of Science and Arts, Najran University, P.O. Box-1988, Najran 11001, Saudi Arabia;1. Lebanese German University, Sahel-Alma Campus, Jounieh, P.O.BOX 206, Lebanon;2. Université de Bordeaux, ICMCB-CNRS, Pessac, France;1. Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia;2. Department of Physics, National Sun Yat-sen University, Kaohsiung 80424, Taiwan, ROC;3. Department of Applied Physics, National University of Kaohsiung, Kaohsiung 81148, Taiwan, ROC;4. Siberian Federal University, 660041 Krasnoyarsk, Russia |
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| Abstract: | Herein, we report the facile growth of ZnO nanoflowers composed of nanorods on silicon substrate by non-catalytic thermal evaporation process. The grown nanoflowers were examined in terms of their morphological, structural, optical and field emission properties. The detailed characterizations revealed that the nanoflowers are grown in high density, possessing well-crystallinity and exhibiting wurtzite hexagonal phase. The Raman-scattering spectrum shows a sharp optical-phonon E2 mode at 437 cm?1 which confirmed the wurtzite hexagonal phase for the grown nanoflowers. The room-temperature PL spectrum depict a strong ultraviolet emission at 381 nm, revealed good optical properties for the ZnO nanoflowers. The field emission studies revealed that a turn-on field for the ZnO nanoflowers based field emission device was 4.3 V/μm and the emission current density reached to 0.075 mA/cm2 at an applied electric field of 7.2 V/μm and exhibit no saturation. The field enhancement factor ‘β’ for the fabricated device was estimated from the F-N plot and found to be ~2.75×103. Finally, systematic time-dependent experiments were performed to determine the growth process for the formation of ZnO nanoflowers composed of nanorods. |
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| Keywords: | ZnO Nanoflowers Optical properties Field emission Field enhancement factor |
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