Nitrogen dioxide sensing using multilayer structure of reduced graphene oxide and α-Fe2O3
Authors:
- Tadeusz Pisarkiewicz,
- Wojciech Maziarz,
- Artur Małolepszy,
- Leszek Stobiński,
- Dagmara Agnieszka Michoń,
- Aleksandra Szkudlarek,
- Marcin Pisarek,
- Jarosław Kanak,
- Artur M. Rydosz
Abstract
Multilayers consisting of graphene oxide (GO) and α-Fe2O3 thin layers were deposited on the ceramic substrates by the spray LbL (layer by layer) coating technique. Graphene oxide was prepared from graphite using the modified Hummers method. Obtained GO flakes reached up to 6 nanometers in thickness and 10 micrometers in lateral size. Iron oxide Fe2O3 was obtained by the wet chemical method from FeCl3 and NH4OH solution. Manufactured samples were deposited as 3 LbL (GO and Fe2O3 layers deposited sequentially) and 6 LbL structures with GO as a bottom layer. Electrical measurements show the decrease of multilayer resistance after the introduction of the oxidizing NO2 gas to the ambient air atmosphere. The concentration of NO2 was changed from 1 ppm to 20 ppm. The samples changed their resistance even at temperatures close to room temperature, however, the sensitivity increased with temperature. Fe2O3 is known as an n-type semiconductor, but the rGO/Fe2O3 hybrid structure behaved similarly to rGO, which is p-type. Both chemisorbed O2 and NO2 act as electron traps decreasing the concentration of electrons and increasing the effective multilayer conductivity. An explanation of the observed variations of multilayer structure resistance also the possibility of heterojunctions formation was taken into account.
- Record ID
- WUTfff1802dfa4b435f9c93e2794445a277
- Author
- Journal series
- Sensors, ISSN 1424-8220, e-ISSN 1424-3210
- Issue year
- 2021
- Vol
- 21
- No
- 3
- Pages
- 1-13
- Publication size in sheets
- 0.60
- Article number
- 1011
- Keywords in English
- graphen oxide, reduced graphene oxide, α-Fe2O3/rGO multilayer, NO2 sensing
- ASJC Classification
- ; ; ;
- DOI
- DOI:10.3390/s21031011 Opening in a new tab
- URL
- https://www.mdpi.com/1424-8220/21/3/1011/htm Opening in a new tab
- Language
- (en) English
- License
- File
-
- File: 1
- Nitrogen dioxide sensing using multilayer structure of reduced graphene oxide and α-Fe2O3, File Pisarkiewicz T. (i in.) - Nitrogen dioxide sensing...pdf / 3 MB
- Pisarkiewicz T. (i in.) - Nitrogen dioxide sensing...pdf
- publication date: 12-02-2021
- Nitrogen dioxide sensing using multilayer structure of reduced graphene oxide and α-Fe2O3, File Pisarkiewicz T. (i in.) - Nitrogen dioxide sensing...pdf / 3 MB
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- Score (nominal)
- 100
- Score source
- journalList
- Score
- = 100.0, 20-05-2022, ArticleFromJournal
- Publication indicators
- = 0; = 4; : 2016 = 1.393; : 2018 (2 years) = 3.031 - 2018 (5 years) =3.302
- Additional fields
- Uwagi: This work was supported by the National Science Centre, Poland NCN UMO2016/23/B/ST7/00894 and National Science Centre, NCN Poland 2017/26/D/ST7/00355.
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- Uniform Resource Identifier
- https://repo.pw.edu.pl/info/article/WUTfff1802dfa4b435f9c93e2794445a277/
- URN
urn:pw-repo:WUTfff1802dfa4b435f9c93e2794445a277
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