[PDF]    https://doi.org/10.3952/physics.v57i4.3599

Open access article / Atviros prieigos straipsnis

Lith. J. Phys. 57, 207–217 (2017)
HETERO CuOx /ZnO MICRO-/NANOSTRUCTURE: CARBOTHERMAL REDUCTION–VAPOUR PHASE TRANSPORT
Ali Rahmatia,b, F. Rahimi Bayaza,b, A. Lotfianic, and M. Kouhestanid
aDepartment of Physics, Faculty of Science, Vali-e-Asr University of Rafsanjan, 7718897111 Rafsanjan, Iran
bNanostructure Laboratory, Department of Physics, Faculty of Science, Vali-e-Asr University of Rafsanjan, 7718897111 Rafsanjan, Iran
cLaser and Plasma Research Institute, Shahid Beheshti University, P.O. Box 198396-3113, Evin, Tehran, Iran
dPhysics Department, Payame Noor University, P.O. Box 19395-3697, Tehran, Iran
alirahmati1980@gmail.com

Received 10 April 2017; revised 19 May 2017; accepted 15 June 2017

ZnO micro-/nanostructures were synthesized by the carbothermal reduction–chemical vapour transport method. This work is focused on the effect of the substrate temperature and Cu catalyst layer on the shape and geometry of ZnO micro-/nanostructures. The thermally oxidized Cu template affects the structure, chemical identity, optical and photoluminescence properties of the ZnO micro-/nanostructure and results in a CuOx/ZnO heterostructure. SEM studies give a direct evidence of the role of deposition temperature and Cu catalyst in the formation of a stable hemisphere based wire, a comb-like cantilever, a javelin-like tetrapod, a spherical and polyhedral cage of ZnO. XRD and Raman measurements confirm a hexagonal wurtzite structure of the ZnO micro-/nanostructure. The absorption edge of the ZnO/CuOx heterostructure is redshifted in comparison to the pure ZnO structure. PL studies indicate that the UV emission can be suppressed significantly while the green emission is enhanced due to the change in the morphology of ZnO micro-/nanostructures.
Keywords: vapour phase transport growth, CuOx/ZnO heterostructure, carbothermal reduction
PACS: 68.35.–p, 73.40.Kp, 81.16.–c

ĮVAIRIALYTIS CuOx/ZnO MIKRO- ARBA NANODARINYS: KARBOTERMINĖ REDUKCIJA SU GARŲ FAZĖS PERNAŠA
Ali Rahmatia,b, F. Rahimi Bayaza,b, A. Lotfianic, M. Kouhestanid

aRafsandžano Vali-e-Asr universiteto Mokslo fakulteto Fizikos katedra, Rafsandžanas, Iranas
bRafsandžano Vali-e-Asr universiteto Mokslo fakulteto Nanostruktūrų laboratorija, Rafsandžanas, Iranas
cŠahid Behešti universitetas, Evinas, Teheranas, Iranas
dPajam Nur universitetas, Teheranas, Iranas


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