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Open AccessFeature PaperArticle

Low-Temperature Vapor-Solid Growth of ZnO Nanowhiskers for Electron Field Emission

1
Center for Hybrid Nanostructures (CHyN), Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
2
Institute of Advanced Ceramics, Hamburg University of Technology (TUHH), Denickestraße 15, 21073 Hamburg, Germany
*
Author to whom correspondence should be addressed.
Both authors equally contributed to the work.
Coatings 2019, 9(11), 698; https://doi.org/10.3390/coatings9110698
Received: 23 August 2019 / Revised: 1 October 2019 / Accepted: 22 October 2019 / Published: 25 October 2019
(This article belongs to the Special Issue 1D, 2D and 3D ZnO: Synthesis, Characterization and Applications)
One-dimensional zinc oxide nanostructures have aroused interest from scientists and engineers for electron field emission applications because of their experimentally accessible high aspect ratio in combination with their low work function. A comprehensive study of the vapor-solid growth of zinc oxide (ZnO) nanowhiskers by utilizing zinc acetylacetonate hydrate and oxygen at low temperature (580 °C) is reported herein. The nanowhiskers morphology was investigated by varying different growth parameters, such as temperature, substrate type and position, gas flow, precursor amount, and growth time. According to the obtained parameter dependences, the process was optimized to achieve homogenous crystalline nanowhiskers with high aspect ratios and clearly defined surface facets and tips. We show electron field emission measurements from tailor-made ZnO nanowhiskers grown on n-doped silicon, titanium thin films, and free-standing silicon nitride membranes, revealing field emission turn-on fields significantly lower compared to a perfect flat ZnO thin film. Especially the latter devices—ZnO nanowhiskers on a free-standing membrane—might pave the way into a novel nanomembrane detector unit in proteomics, which can significantly extend the mass range of current time-of-flight mass spectrometers. View Full-Text
Keywords: zinc oxide; vapor-solid growth; nanowhiskers; electron field emission; zinc acetylacetonate hydrate zinc oxide; vapor-solid growth; nanowhiskers; electron field emission; zinc acetylacetonate hydrate
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MDPI and ACS Style

Hedrich, C.; Haugg, S.; Pacarizi, L.; P. Furlan, K.; Blick, R.H.; Zierold, R. Low-Temperature Vapor-Solid Growth of ZnO Nanowhiskers for Electron Field Emission. Coatings 2019, 9, 698.

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