Surface reaction mechanism and characteristics of 2-dimensional TiO2 and 0-dimensional Ag nanocomposites specialized for H2S gas sensing at room temperature

Un Yup Lee; Min Young Kim; Kyu Hyoung Lee; Sol Han; Seung Yong Lee; Ali Mirzaei; Sun Woo Choi; Myung Sik Choi; Changhyun Jin; Jeong Yun Hwang

doi:10.1016/j.snr.2025.100290

Surface reaction mechanism and characteristics of 2-dimensional TiO₂ and 0-dimensional Ag nanocomposites specialized for H₂S gas sensing at room temperature

Un Yup Lee
, Min Young Kim
, Kyu Hyoung Lee
, Sol Han
, Seung Yong Lee
, Ali Mirzaei
, Sun Woo Choi
, Myung Sik Choi
, Changhyun Jin
, Jeong Yun Hwang

Yonsei University
Shiraz University of Technology
Kangwon National University

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

8 Scopus citations

Abstract

In this study, we provide the synthesis of pristine TiO₂ nanosheets (NSs) via a simple flux method and their decoration with Ag nanoparticles (NPs) using a hydrothermal method for room-temperature H₂S gas sensing. Gas sensing experiments were conducted at 25 °C, evaluating the response of the Ag NPs-decorated TiO₂ NSs to various gases. Results demonstrated the gas sensor exhibited a superior response to H₂S gas compared to other gases, outperforming the pristine TiO₂ NSs gas sensor. Additionally, its response to H₂S gas surpassed that of the TiO₂ NSs gas sensor, highlighting the promising role of Ag decoration for H₂S gas detection. Sensing behavior in humid atmosphere was also investigated. The improved H₂S gas sensing performance can be attributed to the catalytic effect of Ag, the formation of Ag/TiO₂ heterojunctions, and the large surface area of the TiO₂ NSs. This study introduces a straightforward approach to enhance the gas sensing capabilities of metal oxide NSs.

Original language	English
Article number	100290
Journal	Sensors and Actuators Reports
Volume	9
DOIs	https://doi.org/10.1016/j.snr.2025.100290
State	Published - Jun 2025

Keywords

Ag decoration
Ag/TiO heterojunctions
HS gas sensor
Room temperature
TiO nanosheets

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10.1016/j.snr.2025.100290

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Lee, U. Y., Kim, M. Y., Lee, K. H., Han, S., Lee, S. Y., Mirzaei, A., Choi, S. W., Choi, M. S., Jin, C., & Hwang, J. Y. (2025). Surface reaction mechanism and characteristics of 2-dimensional TiO₂ and 0-dimensional Ag nanocomposites specialized for H₂S gas sensing at room temperature. Sensors and Actuators Reports, 9, Article 100290. https://doi.org/10.1016/j.snr.2025.100290

@article{8b70592855d7411782eeae9491dd099a,

title = "Surface reaction mechanism and characteristics of 2-dimensional TiO2 and 0-dimensional Ag nanocomposites specialized for H2S gas sensing at room temperature",

abstract = "In this study, we provide the synthesis of pristine TiO2 nanosheets (NSs) via a simple flux method and their decoration with Ag nanoparticles (NPs) using a hydrothermal method for room-temperature H2S gas sensing. Gas sensing experiments were conducted at 25 °C, evaluating the response of the Ag NPs-decorated TiO2 NSs to various gases. Results demonstrated the gas sensor exhibited a superior response to H2S gas compared to other gases, outperforming the pristine TiO2 NSs gas sensor. Additionally, its response to H2S gas surpassed that of the TiO2 NSs gas sensor, highlighting the promising role of Ag decoration for H2S gas detection. Sensing behavior in humid atmosphere was also investigated. The improved H2S gas sensing performance can be attributed to the catalytic effect of Ag, the formation of Ag/TiO2 heterojunctions, and the large surface area of the TiO2 NSs. This study introduces a straightforward approach to enhance the gas sensing capabilities of metal oxide NSs.",

keywords = "Ag decoration, Ag/TiO heterojunctions, HS gas sensor, Room temperature, TiO nanosheets",

author = "Lee, \{Un Yup\} and Kim, \{Min Young\} and Lee, \{Kyu Hyoung\} and Sol Han and Lee, \{Seung Yong\} and Ali Mirzaei and Choi, \{Sun Woo\} and Choi, \{Myung Sik\} and Changhyun Jin and Hwang, \{Jeong Yun\}",

note = "Publisher Copyright: {\textcopyright} 2025",

year = "2025",

month = jun,

doi = "10.1016/j.snr.2025.100290",

language = "English",

volume = "9",

journal = "Sensors and Actuators Reports",

issn = "2666-0539",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Surface reaction mechanism and characteristics of 2-dimensional TiO2 and 0-dimensional Ag nanocomposites specialized for H2S gas sensing at room temperature

AU - Lee, Un Yup

AU - Kim, Min Young

AU - Lee, Kyu Hyoung

AU - Han, Sol

AU - Lee, Seung Yong

AU - Mirzaei, Ali

AU - Choi, Sun Woo

AU - Choi, Myung Sik

AU - Jin, Changhyun

AU - Hwang, Jeong Yun

PY - 2025/6

Y1 - 2025/6

N2 - In this study, we provide the synthesis of pristine TiO2 nanosheets (NSs) via a simple flux method and their decoration with Ag nanoparticles (NPs) using a hydrothermal method for room-temperature H2S gas sensing. Gas sensing experiments were conducted at 25 °C, evaluating the response of the Ag NPs-decorated TiO2 NSs to various gases. Results demonstrated the gas sensor exhibited a superior response to H2S gas compared to other gases, outperforming the pristine TiO2 NSs gas sensor. Additionally, its response to H2S gas surpassed that of the TiO2 NSs gas sensor, highlighting the promising role of Ag decoration for H2S gas detection. Sensing behavior in humid atmosphere was also investigated. The improved H2S gas sensing performance can be attributed to the catalytic effect of Ag, the formation of Ag/TiO2 heterojunctions, and the large surface area of the TiO2 NSs. This study introduces a straightforward approach to enhance the gas sensing capabilities of metal oxide NSs.

AB - In this study, we provide the synthesis of pristine TiO2 nanosheets (NSs) via a simple flux method and their decoration with Ag nanoparticles (NPs) using a hydrothermal method for room-temperature H2S gas sensing. Gas sensing experiments were conducted at 25 °C, evaluating the response of the Ag NPs-decorated TiO2 NSs to various gases. Results demonstrated the gas sensor exhibited a superior response to H2S gas compared to other gases, outperforming the pristine TiO2 NSs gas sensor. Additionally, its response to H2S gas surpassed that of the TiO2 NSs gas sensor, highlighting the promising role of Ag decoration for H2S gas detection. Sensing behavior in humid atmosphere was also investigated. The improved H2S gas sensing performance can be attributed to the catalytic effect of Ag, the formation of Ag/TiO2 heterojunctions, and the large surface area of the TiO2 NSs. This study introduces a straightforward approach to enhance the gas sensing capabilities of metal oxide NSs.

KW - Ag decoration

KW - Ag/TiO heterojunctions

KW - HS gas sensor

KW - Room temperature

KW - TiO nanosheets

UR - https://www.scopus.com/pages/publications/85216735970

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DO - 10.1016/j.snr.2025.100290

M3 - Article

AN - SCOPUS:85216735970

SN - 2666-0539

VL - 9

JO - Sensors and Actuators Reports

JF - Sensors and Actuators Reports

M1 - 100290

ER -

Surface reaction mechanism and characteristics of 2-dimensional TiO₂ and 0-dimensional Ag nanocomposites specialized for H₂S gas sensing at room temperature

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