Schottky Diode Based on a Single Carbon-Nanotube-ZnO Hybrid Tetrapod for Selective Sensing Applications.

Postica, V., Schütt, F., Adelung, Rainer and Lupan, O. (2017) Schottky Diode Based on a Single Carbon-Nanotube-ZnO Hybrid Tetrapod for Selective Sensing Applications. Advanced Materials Interfaces, 4 (19). p. 1700507. DOI 10.1002/admi.201700507.

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Abstract

In this work, a general strategy to change the selectivity of individual ZnO tetrapod (ZnO‐T)‐Schottky diode‐based devices by hybridization with carbon nanotubes (CNT) is presented. A microscale Schottky diode based on Pt‐nanocontacts to a single ZnO‐T covered/hybridized with CNT, designated as ZnO‐T−CNT, is fabricated and the temperature‐dependent UV and gas sensing properties are investigated. The gas sensing investigations indicate that due to the presence of CNTs on the surface of the ZnO‐T a higher NH3 response (factor of ≈90) at room temperature is observed, compared to H2 gas response (≈14). This effect is attributed to the excellent charge transfer between the CNTs and ZnO‐T as well as NH3 molecule adsorption on the surface of the CNTs, which can efficiently reduce the Schottky barrier height. By increasing the operating temperature up to 150 °C (starting from 50 °C) the NH3 response is considerably reduced, leading to an excellent H2 gas selectivity. In the case of H2 gas, an increase in temperature up to 150 °C shows a considerably increase in gas response of about 140 (≈10 times). Thus, this device offers the possibility to be used for selective detection of NH3 and H2 by only changing the operating temperature. Furthermore, by using the developed strategy/approach other materials can be used for the fabrication of gas sensors with selectivity to other gases.

Document Type: Article
Keywords: ammonia hydrogen sensors Schottky diodes single tetrapod zinc oxide
Research affiliation: Kiel University > Kiel Marine Science
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.1002/admi.201700507
ISSN: 2196-7350
Date Deposited: 12 Dec 2017 13:47
Last Modified: 09 May 2019 10:25
URI: http://oceanrep.geomar.de/id/eprint/40551

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