Characteristics of point defects on the room temperature ferromagnetic and highly NO2 selectivity gas sensing of p-type Mn3O4 nanorods

Ioannis Kortidis; Hendrik C. Swart; Suprakas Sinha Ray; David E. Motaung

doi:10.1016/j.snb.2019.01.007

Characteristics of point defects on the room temperature ferromagnetic and highly NO₂ selectivity gas sensing of p-type Mn₃O₄ nanorods

Ioannis Kortidis, Hendrik C. Swart, Suprakas Sinha Ray, David E. Motaung

Chemical Sciences

Research output: Contribution to journal › Article › peer-review

88 Citations (Scopus)

Abstract

This study investigates the room temperature (RT) gas-sensing and ferromagnetic behavior of p-type materials based on a comparison of NiO, Mn₃O₄, and CuO nanostructures prepared using a hydrothermal method. The Mn₃O₄ nanorods based sensor exhibited high sensitivity and responses to 40 ppm NO₂ and a selectivity to NO₂ over the interference of CO, NH₃, CH₄, C₆H₆, C₇H₈ and C₃H₆O gases at 23 °C. The observed response and selectivity to 40 ppm NO₂ are ascribed to the vastly gas accessibility induced by ample porosity, high surface area and point defects of Mn₃O₄. This is justified by a clear correlation of point defects with the ferromagnetic and gas-sensing properties. The linear behavior observed for the response versus gas concentration (adj R² = 0.98519), signified that the Mn₃O₄-based sensor is suitable for NO₂ detection at 23 °C. A model of the gas-sensing mechanism and the influence of point defects were presented to further illustrate the sensing performance.

Original language	English
Pages (from-to)	92-107
Number of pages	16
Journal	Sensors and Actuators B: Chemical
Volume	285
DOIs	https://doi.org/10.1016/j.snb.2019.01.007
Publication status	Published - 15 Apr 2019

Keywords

Ferromagnetism
Gas sensing
MnO
p-type materials

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Instrumentation
Condensed Matter Physics
Surfaces, Coatings and Films
Metals and Alloys
Electrical and Electronic Engineering
Materials Chemistry

Access to Document

10.1016/j.snb.2019.01.007

Cite this

@article{6140174198664639a22515695b6d9667,

title = "Characteristics of point defects on the room temperature ferromagnetic and highly NO2 selectivity gas sensing of p-type Mn3O4 nanorods",

abstract = "This study investigates the room temperature (RT) gas-sensing and ferromagnetic behavior of p-type materials based on a comparison of NiO, Mn3O4, and CuO nanostructures prepared using a hydrothermal method. The Mn3O4 nanorods based sensor exhibited high sensitivity and responses to 40 ppm NO2 and a selectivity to NO2 over the interference of CO, NH3, CH4, C6H6, C7H8 and C3H6O gases at 23 °C. The observed response and selectivity to 40 ppm NO2 are ascribed to the vastly gas accessibility induced by ample porosity, high surface area and point defects of Mn3O4. This is justified by a clear correlation of point defects with the ferromagnetic and gas-sensing properties. The linear behavior observed for the response versus gas concentration (adj R2 = 0.98519), signified that the Mn3O4-based sensor is suitable for NO2 detection at 23 °C. A model of the gas-sensing mechanism and the influence of point defects were presented to further illustrate the sensing performance.",

keywords = "Ferromagnetism, Gas sensing, MnO, p-type materials",

author = "Ioannis Kortidis and Swart, {Hendrik C.} and Ray, {Suprakas Sinha} and Motaung, {David E.}",

note = "Publisher Copyright: {\textcopyright} 2019 Elsevier B.V.",

year = "2019",

month = apr,

day = "15",

doi = "10.1016/j.snb.2019.01.007",

language = "English",

volume = "285",

pages = "92--107",

journal = "Sensors and Actuators B: Chemical",

issn = "0925-4005",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Characteristics of point defects on the room temperature ferromagnetic and highly NO2 selectivity gas sensing of p-type Mn3O4 nanorods

AU - Kortidis, Ioannis

AU - Swart, Hendrik C.

AU - Ray, Suprakas Sinha

AU - Motaung, David E.

PY - 2019/4/15

Y1 - 2019/4/15

N2 - This study investigates the room temperature (RT) gas-sensing and ferromagnetic behavior of p-type materials based on a comparison of NiO, Mn3O4, and CuO nanostructures prepared using a hydrothermal method. The Mn3O4 nanorods based sensor exhibited high sensitivity and responses to 40 ppm NO2 and a selectivity to NO2 over the interference of CO, NH3, CH4, C6H6, C7H8 and C3H6O gases at 23 °C. The observed response and selectivity to 40 ppm NO2 are ascribed to the vastly gas accessibility induced by ample porosity, high surface area and point defects of Mn3O4. This is justified by a clear correlation of point defects with the ferromagnetic and gas-sensing properties. The linear behavior observed for the response versus gas concentration (adj R2 = 0.98519), signified that the Mn3O4-based sensor is suitable for NO2 detection at 23 °C. A model of the gas-sensing mechanism and the influence of point defects were presented to further illustrate the sensing performance.

AB - This study investigates the room temperature (RT) gas-sensing and ferromagnetic behavior of p-type materials based on a comparison of NiO, Mn3O4, and CuO nanostructures prepared using a hydrothermal method. The Mn3O4 nanorods based sensor exhibited high sensitivity and responses to 40 ppm NO2 and a selectivity to NO2 over the interference of CO, NH3, CH4, C6H6, C7H8 and C3H6O gases at 23 °C. The observed response and selectivity to 40 ppm NO2 are ascribed to the vastly gas accessibility induced by ample porosity, high surface area and point defects of Mn3O4. This is justified by a clear correlation of point defects with the ferromagnetic and gas-sensing properties. The linear behavior observed for the response versus gas concentration (adj R2 = 0.98519), signified that the Mn3O4-based sensor is suitable for NO2 detection at 23 °C. A model of the gas-sensing mechanism and the influence of point defects were presented to further illustrate the sensing performance.

KW - Ferromagnetism

KW - Gas sensing

KW - MnO

KW - p-type materials

UR - http://www.scopus.com/inward/record.url?scp=85059849219&partnerID=8YFLogxK

U2 - 10.1016/j.snb.2019.01.007

DO - 10.1016/j.snb.2019.01.007

M3 - Article

AN - SCOPUS:85059849219

SN - 0925-4005

VL - 285

SP - 92

EP - 107

JO - Sensors and Actuators B: Chemical

JF - Sensors and Actuators B: Chemical

ER -