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Langmuir, 2014, 30 (13), pp 3913–3921 .
Mohammad R. Alenezi *§†, Abdullah S. Alshammari§‡, Talal H. Alzanki †, Peter Jarowski §, Simon John Henley §, and S. Ravi P. Silva *§
§ Nanoelectronics Center, Advanced Technology Institute,University of Surrey, Guildford GU2 7XH, U.K and
† College of Technological Studies, PAAET, P.O. Box 42325, Shuwaikh, Kuwait and
‡ Department of Physics, College of Science, University of Hail, P.O. Box 2440, Hail, KSA.
Abstract
The fabrication of highly functional materials for practical devices requires a deep understanding of the association between morphological and structural properties and applications. A controlled hydrothermal method to produce single crystal ZnO hexagonal nanodisks, nanorings, and nanoroses using a mixed solution of zinc sulfate (ZnSO4) and hexamethylenetetramine (HMTA) without the need of catalysts, substrates, or templates at low temperature (75 °C) is introduced. Metal–semiconductor–metal (MSM) ultraviolet (UV) detectors were fabricated based on individual and multiple single-crystal zinc oxide (ZnO) hexagonal nanodisks. High quality single crystal individual nanodisk devices were fabricated with inkjet-printed silver electrodes. The detectors fabricated show record photoresponsivity (3300 A/W) and external quantum efficiency (1.2 × 104), which we attribute to the absence of grain boundaries in the single crystal ZnO nanodisk and the polarity of its exposed surface.
Copyright © 2014 American Chemical Society.
