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Highly Sensitive Formaldehyde Detection Using Well-Aligned Zinc Oxide Nanosheets Synthesized by Chemical Bath Deposition Technique

School of Chemical Engineering, Chonbuk National University, Jeonju 54896, Korea
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Materials 2019, 12(2), 250; https://doi.org/10.3390/ma12020250
Received: 7 December 2018 / Revised: 3 January 2019 / Accepted: 7 January 2019 / Published: 13 January 2019
(This article belongs to the Section Advanced Nanomaterials and Nanotechnology)
Detection of formaldehyde is very important in terms of life protection, as it can cause serious injury to eyes, skin, mouth and gastrointestinal function if indirectly inhaled. Researchers are therefore putting effort into developing novel and sensitive devices. In this work, we have fabricated an electro-chemical sensor in the form of a field effect transistor (FET) to detect formaldehyde over a wide range (10 nM to 1 mM). For this, ZnO nanosheets (NS) were first synthesized by hydrothermal method with in-situ deposition on cleaned SiO2/Si (100) substrate. The synthesized materials were characterized for morphology and purity and surface area (31.718 m2/g). The developed device was tested for formaldehyde detection at room temperature that resulted in a linear (96%) and reproducible response with concentration, sensitivity value of 0.27 mA/M/cm2 with an error of ±2% and limit of detection (LOD) as 210 nM. View Full-Text
Keywords: ZnO; nanosheet; formaldehyde; chemical sensor; FET; field effect transistor ZnO; nanosheet; formaldehyde; chemical sensor; FET; field effect transistor
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Kim, E.-B.; Seo, H.-K. Highly Sensitive Formaldehyde Detection Using Well-Aligned Zinc Oxide Nanosheets Synthesized by Chemical Bath Deposition Technique. Materials 2019, 12, 250.

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