Please use this identifier to cite or link to this item: http://cris.utm.md/handle/5014/140
Title: The effect of morphology and functionalization on UV detection properties of ZnO networked tetrapods and single nanowires
Authors: POSTICA, Vasile 
PAULOWICZ, Ingo 
LUPAN, Oleg 
SCHÜTT, Fabian 
WOLFF, Niklas 
COJOCARU, Ala 
MISHRA, Y.K. 
KIENLE, Lorenz 
ADELUNG, Rainer 
Keywords: ZnO;nanosensor;Device;photodetector;CNT;Individual nanostructures
Issue Date: Aug-2019
Source: TY - JOUR AU - Postica, Vasile AU - Paulowicz, Ingo AU - Oleg, Lupan AU - Schütt, Fabian AU - Wolff, Niklas AU - Cojocaru, A. AU - Mishra, Yogendra AU - Kienle, Lorenz AU - Adelung, Rainer PY - 2018/11/30 SP - T1 - The effect of morphology and functionalization on UV detection properties of ZnO networked tetrapods and single nanowires VL - Online JO - Vacuum ER -
Journal: VACUUM 
Abstract: 
Rapid detection and fast response of nanoelectronic devices based on semiconducting oxides is nowadays a modern and stringent subject of research. Device performances depend mainly on the morphologies of the metal oxide nanostructures. In the scope of this work, the influence of the structural morphology of three-dimensional (3-D) ZnO nano- and microstructured networks on the room temperature UV detection properties is studied in detail. We show that the formation of multiple potential barriers between the nanostructures, as well as the diameter of the nanostructures, which is in the same order of magnitude as the Debye length, strongly influence the UV sensing properties. Consequently, 3-D ZnO networks consisting of interconnected ultra-long wire-like tips (up to 10 μm) and with small wire diameters of 50–150 nm, demonstrated the highest UV sensing performances (UV response ratio of ∼3100 at 5 V applied bias voltage). Furthermore, we demonstrate the possibility of substantially increasing the UV sensing performances of individual ZnO nanowire (NW) (diameter of ∼50 nm) by surface functionalization with carbon nanotubes (CNTs), showing high response ratio (∼60–50 mW/cm2), as well as fast response (∼1 s) and recovery (∼1 s) times. The obtained results thus provide a platform with respect to the next generation of portable UV radiation detectors based on semiconducting oxide networks.
URI: http://cris.utm.md/handle/5014/140
ISSN: 0042-207X
DOI: 10.1016/j.vacuum.2018.11.046
Appears in Collections:Journal Articles

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