Impact of Ag on the Limit of Detection towards NH3-Sensing in Spray-Coated WO3 Thin-Films

Anusha; Aninamol Ani; P. Poornesh; Albin Antony; Igor V. Shchetinin; K. K. Nagaraja; Saikat Chattopadhyay; K. B. Vinayakumar

doi:10.3390/s22052033

Impact of Ag on the Limit of Detection towards NH₃-Sensing in Spray-Coated WO₃ Thin-Films

Anusha
, Aninamol Ani
, P. Poornesh^*
, Albin Antony
, Bhaghyesh
, Igor V. Shchetinin
, K. K. Nagaraja
, Saikat Chattopadhyay
, K. B. Vinayakumar

^*Corresponding author for this work

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

16 Citations (Scopus)

Abstract

Ag-doped WO₃ (Ag–WO₃) films were deposited on a soda-lime glass substrate via a facile spray pyrolysis technique. The surface roughness of the films varied between 0.6 nm and 4.3 nm, as verified by the Atomic Force Microscopy (AFM) studies. Ammonia (NH₃)-sensing measurements of the films were performed for various concentrations at an optimum sensor working temperature of 200^◦C. Enrichment of oxygen vacancies confirmed by X-ray Photoelectron Spectroscopy (XPS) in 1% Ag–WO₃ enhanced the sensor response from 1.06 to 3.29, approximately 3 times higher than that of undoped WO₃. Limit of detection (LOD) up to 500 ppb is achieved for 1% Ag–WO₃, substantiating the role of Ag in improving sensor performance.

Original language	English
Article number	2033
Journal	Sensors
Volume	22
Issue number	5
DOIs	https://doi.org/10.3390/s22052033
Publication status	Published - 05-03-2022

All Science Journal Classification (ASJC) codes

Analytical Chemistry
Information Systems
Atomic and Molecular Physics, and Optics
Biochemistry
Instrumentation
Electrical and Electronic Engineering

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@article{320ea6eb024546b89165384b2e9d96d4,

title = "Impact of Ag on the Limit of Detection towards NH3-Sensing in Spray-Coated WO3 Thin-Films",

abstract = "Ag-doped WO3 (Ag–WO3) films were deposited on a soda-lime glass substrate via a facile spray pyrolysis technique. The surface roughness of the films varied between 0.6 nm and 4.3 nm, as verified by the Atomic Force Microscopy (AFM) studies. Ammonia (NH3)-sensing measurements of the films were performed for various concentrations at an optimum sensor working temperature of 200◦C. Enrichment of oxygen vacancies confirmed by X-ray Photoelectron Spectroscopy (XPS) in 1\% Ag–WO3 enhanced the sensor response from 1.06 to 3.29, approximately 3 times higher than that of undoped WO3. Limit of detection (LOD) up to 500 ppb is achieved for 1\% Ag–WO3, substantiating the role of Ag in improving sensor performance.",

author = "Anusha and Aninamol Ani and P. Poornesh and Albin Antony and Bhaghyesh and Shchetinin, \{Igor V.\} and Nagaraja, \{K. K.\} and Saikat Chattopadhyay and Vinayakumar, \{K. B.\}",

note = "Funding Information: Acknowledgments: Poornesh P acknowledges Manipal Academy of Higher Education, Manipal for funding the research project through Intramural Funding (Grant no.: MAHE/DREG/PhD/IMF/2019). Anusha acknowledges the Indian Nano electronics User Program (INUP), supported by the Ministry of Human Resource Development (MHRD), Govt. of India, located at the Indian Institute of Science, Bengaluru for providing the facilities to carry out a part of the work. Publisher Copyright: {\textcopyright} 2022 by the authors. Licensee MDPI, Basel, Switzerland.",

year = "2022",

month = mar,

day = "5",

doi = "10.3390/s22052033",

language = "English",

volume = "22",

journal = "Sensors",

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T1 - Impact of Ag on the Limit of Detection towards NH3-Sensing in Spray-Coated WO3 Thin-Films

AU - Anusha,

AU - Ani, Aninamol

AU - Poornesh, P.

AU - Antony, Albin

AU - Bhaghyesh,

AU - Shchetinin, Igor V.

AU - Nagaraja, K. K.

AU - Chattopadhyay, Saikat

AU - Vinayakumar, K. B.

N1 - Funding Information: Acknowledgments: Poornesh P acknowledges Manipal Academy of Higher Education, Manipal for funding the research project through Intramural Funding (Grant no.: MAHE/DREG/PhD/IMF/2019). Anusha acknowledges the Indian Nano electronics User Program (INUP), supported by the Ministry of Human Resource Development (MHRD), Govt. of India, located at the Indian Institute of Science, Bengaluru for providing the facilities to carry out a part of the work. Publisher Copyright: © 2022 by the authors. Licensee MDPI, Basel, Switzerland.

PY - 2022/3/5

Y1 - 2022/3/5

N2 - Ag-doped WO3 (Ag–WO3) films were deposited on a soda-lime glass substrate via a facile spray pyrolysis technique. The surface roughness of the films varied between 0.6 nm and 4.3 nm, as verified by the Atomic Force Microscopy (AFM) studies. Ammonia (NH3)-sensing measurements of the films were performed for various concentrations at an optimum sensor working temperature of 200◦C. Enrichment of oxygen vacancies confirmed by X-ray Photoelectron Spectroscopy (XPS) in 1% Ag–WO3 enhanced the sensor response from 1.06 to 3.29, approximately 3 times higher than that of undoped WO3. Limit of detection (LOD) up to 500 ppb is achieved for 1% Ag–WO3, substantiating the role of Ag in improving sensor performance.

AB - Ag-doped WO3 (Ag–WO3) films were deposited on a soda-lime glass substrate via a facile spray pyrolysis technique. The surface roughness of the films varied between 0.6 nm and 4.3 nm, as verified by the Atomic Force Microscopy (AFM) studies. Ammonia (NH3)-sensing measurements of the films were performed for various concentrations at an optimum sensor working temperature of 200◦C. Enrichment of oxygen vacancies confirmed by X-ray Photoelectron Spectroscopy (XPS) in 1% Ag–WO3 enhanced the sensor response from 1.06 to 3.29, approximately 3 times higher than that of undoped WO3. Limit of detection (LOD) up to 500 ppb is achieved for 1% Ag–WO3, substantiating the role of Ag in improving sensor performance.

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DO - 10.3390/s22052033

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AN - SCOPUS:85125898503

SN - 1424-8220

VL - 22

JO - Sensors

JF - Sensors

IS - 5

M1 - 2033

ER -

Impact of Ag on the Limit of Detection towards NH₃-Sensing in Spray-Coated WO₃ Thin-Films

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