TY - JOUR
T1 - An optimal thermal evaporation synthesis of c-axis oriented ZnO nanowires with excellent UV sensing and emission characteristics
AU - Saha, Tridib
AU - Achath Mohanan, Ajay
AU - Swamy, Varghese
AU - Guo, Ningqun
AU - Ramakrishnan, N.
N1 - Funding Information:
The authors thank Advanced Engineering Platform and School of Engineering, Monash University Malaysia. N. Ramakrishnan also acknowledges the Ministry of Higher Education (Malaysia) FRGS grant FRGS/2/2014/SG02/MUSM/03/1 for supporting the work at Monash University Malaysia.
Publisher Copyright:
© 2016 Elsevier Ltd. All rights reserved.
Copyright:
Copyright 2016 Elsevier B.V., All rights reserved.
PY - 2016/5/1
Y1 - 2016/5/1
N2 - Well-aligned (c-axis oriented) ZnO nanowire arrays were successfully synthesized on Si (1 0 0) substrates through an optimized self-seeding thermal evaporation method. An open-ended chemical vapor deposition (CVD) setup was used in the experiment, with argon and purified air as reaction gases. Epitaxial growth of c-axis oriented ZnO nanowires was observed for 5 sccm flow rate of purified air, whereas Zn/Zn suboxide layers and multiple polycrystalline layers of ZnO were obtained for absence and excess of purified air, respectively. Ultraviolet (UV) sensing and emission properties of the as-grown ZnO nanostructures were investigated through the current-voltage (I-V) characteristics of the nanowires under UV (λ = 365 nm) illumination of 8 mW/cm2 and using photoluminescence spectra. Nanowires grown under optimum flow of air emitted four times higher intensity of 380 nm UV light as well as exhibited 34 times higher UV radiation sensitivity compared to that of other nanostructures synthesized in this study.
AB - Well-aligned (c-axis oriented) ZnO nanowire arrays were successfully synthesized on Si (1 0 0) substrates through an optimized self-seeding thermal evaporation method. An open-ended chemical vapor deposition (CVD) setup was used in the experiment, with argon and purified air as reaction gases. Epitaxial growth of c-axis oriented ZnO nanowires was observed for 5 sccm flow rate of purified air, whereas Zn/Zn suboxide layers and multiple polycrystalline layers of ZnO were obtained for absence and excess of purified air, respectively. Ultraviolet (UV) sensing and emission properties of the as-grown ZnO nanostructures were investigated through the current-voltage (I-V) characteristics of the nanowires under UV (λ = 365 nm) illumination of 8 mW/cm2 and using photoluminescence spectra. Nanowires grown under optimum flow of air emitted four times higher intensity of 380 nm UV light as well as exhibited 34 times higher UV radiation sensitivity compared to that of other nanostructures synthesized in this study.
KW - A. Nanostructures
KW - B. Optical properties
KW - B. Vapor deposition
KW - C. X-ray diffraction
KW - D. Electrical properties
UR - http://www.scopus.com/inward/record.url?scp=84955301150&partnerID=8YFLogxK
U2 - 10.1016/j.materresbull.2016.01.034
DO - 10.1016/j.materresbull.2016.01.034
M3 - Article
AN - SCOPUS:84955301150
VL - 77
SP - 147
EP - 154
JO - Materials Research Bulletin
JF - Materials Research Bulletin
SN - 0025-5408
ER -