{"id":18938,"date":"2020-07-01T17:20:00","date_gmt":"2020-07-01T14:20:00","guid":{"rendered":"https:\/\/en.buradabiliyorum.com\/new-chemistry-for-ultra-thin-gas-sensors\/"},"modified":"2020-07-01T17:20:00","modified_gmt":"2020-07-01T14:20:00","slug":"new-chemistry-for-ultra-thin-gas-sensors","status":"publish","type":"post","link":"https:\/\/buradabiliyorum.com\/en\/new-chemistry-for-ultra-thin-gas-sensors\/","title":{"rendered":"#New chemistry for ultra-thin gas sensors"},"content":{"rendered":"

“#New chemistry for ultra-thin gas sensors<\/strong>”<\/p>\n

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\n Credit: CC0 Public Domain
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The app<\/a>lication of zinc oxide layers in industry is manifold and ranges from the protection of degradable goods to the detection of toxic nitrogen oxide gas. Such layers can be deposited by atomic layer deposition (ALD) which employs typically chemical compounds, or simply precursors, which ignite immedia<\/a>tely upon contact with air, i.e. are highly pyrophoric. An interdisciplinary research team at Ruhr-Universit\u00e4t Bochum (RUB) has now established a new fabrication process based on a non-pyrophoric zinc precursor that can be processed at temperatures low enough to allow plastics to be coated. The team published their report in the journal Small<\/i>.<\/p>\n

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Depositing ultra-thin layers<\/b><\/p>\n

In order to produce a sensor for nitrogen dioxide (NO2), a thin layer of nanostructured zinc oxide (ZnO) must be applied to a sensor substrate and then integrated into an electrical component. Professor Anjana Devi’s team used ALD to apply ultra-thin ZnO layers on such sensor substrates.
\nIn general<\/a>, ALD processes are used in industry to miniaturize electrical components using ultra-thin layers, some of which are only a few atomic layers thick, while at the same time increasing their efficiency. For that, suitable precursors are required that react at surfaces to form such a thin film. “The chemistry behind ALD processes is therefore essential and has a huge impact on the resulting thin films,” points out Anjana Devi.
\nSafe handling and highest quality<\/b>
\nTo date, industrial manufacturers have been producing ZnO thin films by deploying an extremely reactive, highly pyrophoric zinc precursor via ALD. “The key for the development of a safe alternative ALD process for ZnO at RUB was to develop a new, non-pyrophoric precursor that is safe to handle and is able to deposit ZnO thin films of the highest quality,” explains Lukas Mai, lead author of the study. “The challenge was to find alternative chemistries to replace the pyrophoric compounds that are generally used in the industry for ZnO.”<\/p>\n

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\n Lukas Mai \u2013 he is reflected in a thin film \u2013 and Anjana Devi. Credit: RUB, Marquard
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The unique aspect of the new process is that it can be performed at very low process temperatures, thus facilitating deposition onto plastics. Consequently, the new process can be used not only for the manufacture of gas sensors, but also of gas barrier layers. In the packaging industry, such layers are applied on plastics to protect degradable goods such as food or pharmaceuticals from air.<\/p>\n

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More information:<\/strong>
\n Lukas Mai et al. Zinc Oxide: From Precursor Chemistry to Gas Sensors: Plasma\u2010Enhanced Atomic Layer Deposition Process Engineering for Zinc Oxide Layers from a Nonpyrophoric Zinc Precursor for Gas Barrier and Sensor Applications (Small 22\/2020), Small<\/i> (2020). DOI: 10.1002\/smll.202070122<\/p>\n

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Journal information:<\/strong>
\n Small<\/cite><\/p>\n


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Citation<\/strong>:
\n New chemistry for ultra-thin gas sensors (2020, July 1)
\n retrieved 1 July 2020
\n from https:\/\/phys.org\/news<\/a>\/2020-07-chemistry-ultra-thin-gas-sensors.html<\/p>\n

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
\n part may be reproduced without the written permission. The content is provided for information purposes only.<\/p><\/div>\n<\/p><\/div>\n

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“#New chemistry for ultra-thin gas sensors” Credit: CC0 Public Domain The application of zinc oxide layers in industry is manifold and ranges from the protection of degradable goods to the detection of toxic nitrogen oxide gas. Such layers can be deposited by atomic layer deposition (ALD) which employs typically chemical compounds, or simply precursors, which…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[16],"tags":[22067,30457],"class_list":["post-18938","post","type-post","status-publish","format-standard","hentry","category-sciencee","tag-nanomaterials","tag-new-chemistry-for-ultra-thin-gas-sensors"],"_links":{"self":[{"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/posts\/18938","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/comments?post=18938"}],"version-history":[{"count":0,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/posts\/18938\/revisions"}],"wp:attachment":[{"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/media?parent=18938"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/categories?post=18938"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/tags?post=18938"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}