Visible light assisted NO2 sensing at room temperature by CdS nanoflake array

Hua Yao Li; Ji Won Yoon; Chul Soon Lee; Kyeorei Lim; Ji Wook Yoon; Jong Heun Lee

doi:10.1016/j.snb.2017.09.118

Visible light assisted NO₂ sensing at room temperature by CdS nanoflake array

Hua Yao Li, Ji Won Yoon, Chul Soon Lee, Kyeorei Lim, Ji Wook Yoon, Jong Heun Lee

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

78 Citations (Scopus)

Abstract

A Highly ordered CdS nanoflake array was fabricated by CVD, and its gas sensing characteristics were investigated. The sensor exhibited high response (resistance ratio) of 89% to 5 part per million (ppm) nitrogen dioxide (NO₂) under green LED illumination (wavelength 500–540 nm, irradiance 21 W/m²) with excellent selectivity and little interference by humidity. Moreover, the sensor showed promising potential for operating under fluorescent lamp and natural solar light, which can be used for medical diagnosis and indoor/outdoor environment monitoring. This performance is attributed to the low band gap energy (2.4 eV) of CdS and the unique morphology of nanoflake array which can enhance both the light absorption and conductivity.

Original language	English
Pages (from-to)	2963-2970
Number of pages	8
Journal	Sensors and Actuators, B: Chemical
Volume	255
DOIs	https://doi.org/10.1016/j.snb.2017.09.118
Publication status	Published - 2018 Feb

Bibliographical note

Funding Information:
This work was supported by a grant from the National Research Foundation of Korea (NRF), which was funded by the Korean government (Ministry of Education, Science, and Technology (MEST), Grant No. 2016R1A2A1A05005331 ).

Publisher Copyright:
© 2017 Elsevier B.V.

Keywords

Cadmium sulfide
Gas sensor
Nitrogen dioxide
Room temperature
Visible light

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.2017.09.118

Cite this

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title = "Visible light assisted NO2 sensing at room temperature by CdS nanoflake array",

abstract = "A Highly ordered CdS nanoflake array was fabricated by CVD, and its gas sensing characteristics were investigated. The sensor exhibited high response (resistance ratio) of 89% to 5 part per million (ppm) nitrogen dioxide (NO2) under green LED illumination (wavelength 500–540 nm, irradiance 21 W/m2) with excellent selectivity and little interference by humidity. Moreover, the sensor showed promising potential for operating under fluorescent lamp and natural solar light, which can be used for medical diagnosis and indoor/outdoor environment monitoring. This performance is attributed to the low band gap energy (2.4 eV) of CdS and the unique morphology of nanoflake array which can enhance both the light absorption and conductivity.",

keywords = "Cadmium sulfide, Gas sensor, Nitrogen dioxide, Room temperature, Visible light",

author = "Li, {Hua Yao} and Yoon, {Ji Won} and Lee, {Chul Soon} and Kyeorei Lim and Yoon, {Ji Wook} and Lee, {Jong Heun}",

note = "Funding Information: This work was supported by a grant from the National Research Foundation of Korea (NRF), which was funded by the Korean government (Ministry of Education, Science, and Technology (MEST), Grant No. 2016R1A2A1A05005331 ). Publisher Copyright: {\textcopyright} 2017 Elsevier B.V.",

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doi = "10.1016/j.snb.2017.09.118",

language = "English",

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T1 - Visible light assisted NO2 sensing at room temperature by CdS nanoflake array

AU - Li, Hua Yao

AU - Yoon, Ji Won

AU - Lee, Chul Soon

AU - Lim, Kyeorei

AU - Yoon, Ji Wook

AU - Lee, Jong Heun

N1 - Funding Information: This work was supported by a grant from the National Research Foundation of Korea (NRF), which was funded by the Korean government (Ministry of Education, Science, and Technology (MEST), Grant No. 2016R1A2A1A05005331 ). Publisher Copyright: © 2017 Elsevier B.V.

PY - 2018/2

Y1 - 2018/2

N2 - A Highly ordered CdS nanoflake array was fabricated by CVD, and its gas sensing characteristics were investigated. The sensor exhibited high response (resistance ratio) of 89% to 5 part per million (ppm) nitrogen dioxide (NO2) under green LED illumination (wavelength 500–540 nm, irradiance 21 W/m2) with excellent selectivity and little interference by humidity. Moreover, the sensor showed promising potential for operating under fluorescent lamp and natural solar light, which can be used for medical diagnosis and indoor/outdoor environment monitoring. This performance is attributed to the low band gap energy (2.4 eV) of CdS and the unique morphology of nanoflake array which can enhance both the light absorption and conductivity.

AB - A Highly ordered CdS nanoflake array was fabricated by CVD, and its gas sensing characteristics were investigated. The sensor exhibited high response (resistance ratio) of 89% to 5 part per million (ppm) nitrogen dioxide (NO2) under green LED illumination (wavelength 500–540 nm, irradiance 21 W/m2) with excellent selectivity and little interference by humidity. Moreover, the sensor showed promising potential for operating under fluorescent lamp and natural solar light, which can be used for medical diagnosis and indoor/outdoor environment monitoring. This performance is attributed to the low band gap energy (2.4 eV) of CdS and the unique morphology of nanoflake array which can enhance both the light absorption and conductivity.

KW - Cadmium sulfide

KW - Gas sensor

KW - Nitrogen dioxide

KW - Room temperature

KW - Visible light

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