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Abstract
Volatile organic compounds (VOCs) are among the most abundant air pollutants. Their high concentrations can adversely affect the human body, and therefore, early detection of VOCs is of outmost importance. Among the different VOCs, in this review paper we have focused our attention to the monitoring of acetaldehyde by chemiresistive gas sensors fabricated from nanostructured semiconducting metal oxides. These sensors can not only provide a high sensing signal for detection of acetaldehyde but also high thermal and mechanical stability along with a low price. This review paper is divided into three major sections. First, we will introduce acetaldehyde as an important VOC and the importance of its detection. Then, the fundamentals of chemiresistive gas sensors will be briefly presented, and in the last section, a survey of the literature on acetaldehyde gas sensors will be presented. The working mechanism of acetaldehyde sensors, their structures, and configurations are reviewed. Finally, the future development outlook and potential applications are discussed, giving a complete panoramic view for researchers working and interested in acetaldehyde detection for different purposes in many fundamental and applicative fields.
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Wang C, Hosomi T, Nagashima K, Takahashi T, Zhang G, Kanai M, Zeng H, Mizukami W, Shioya N, Shimoaka T, Tamaoka T, Yoshida H, Takeda S, Yasui T, Baba Y, Aoki Y, Terao J, Hasegawa T, Yanagida T. Rational Method of Monitoring Molecular Transformations on Metal-Oxide Nanowire Surfaces. NANO LETTERS 2019; 19:2443-2449. [PMID: 30888179 DOI: 10.1021/acs.nanolett.8b05180] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Metal-oxide nanowires have demonstrated excellent capability in the electrical detection of various molecules based on their material robustness in liquid and air environments. Although the surface structure of the nanowires essentially determines their interaction with adsorbed molecules, understanding the correlation between an oxide nanowire surface and an adsorbed molecule is still a major challenge. Herein, we propose a rational methodology to obtain this information for low-density molecules adsorbed on metal oxide nanowire surfaces by employing infrared p-polarized multiple-angle incidence resolution spectroscopy and temperature-programmed desorption/gas chromatography-mass spectrometry. As a model system, we studied the surface chemical transformation of an aldehyde (nonanal, a cancer biomarker in breath) on single-crystalline ZnO nanowires. We found that a slight surface reconstruction, induced by the thermal pretreatment, determines the surface chemical reactivity of nonanal. The present results show that the observed surface reaction trend can be interpreted in terms of the density of Zn ions exposed on the nanowire surface and of their corresponding spatial arrangement on the surface, which promotes the reaction between neighboring adsorbed molecules. The proposed methodology will support a better understanding of complex molecular transformations on various nanostructured metal-oxide surfaces.
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Affiliation(s)
- Chen Wang
- Interdisciplinary Graduate School of Engineering Sciences , Kyushu University , 6-1 Kasuga-Koen , Kasuga , Fukuoka 816-8580 , Japan
| | - Takuro Hosomi
- Institute for Materials Chemistry and Engineering, Kyushu University , 6-1 Kasuga-Koen , Kasuga , Fukuoka 816-8580 , Japan
| | - Kazuki Nagashima
- Interdisciplinary Graduate School of Engineering Sciences , Kyushu University , 6-1 Kasuga-Koen , Kasuga , Fukuoka 816-8580 , Japan
- Institute for Materials Chemistry and Engineering, Kyushu University , 6-1 Kasuga-Koen , Kasuga , Fukuoka 816-8580 , Japan
| | - Tsunaki Takahashi
- Institute for Materials Chemistry and Engineering, Kyushu University , 6-1 Kasuga-Koen , Kasuga , Fukuoka 816-8580 , Japan
| | - Guozhu Zhang
- Institute for Materials Chemistry and Engineering, Kyushu University , 6-1 Kasuga-Koen , Kasuga , Fukuoka 816-8580 , Japan
| | - Masaki Kanai
- Institute for Materials Chemistry and Engineering, Kyushu University , 6-1 Kasuga-Koen , Kasuga , Fukuoka 816-8580 , Japan
| | - Hao Zeng
- Institute for Materials Chemistry and Engineering, Kyushu University , 6-1 Kasuga-Koen , Kasuga , Fukuoka 816-8580 , Japan
| | - Wataru Mizukami
- Interdisciplinary Graduate School of Engineering Sciences , Kyushu University , 6-1 Kasuga-Koen , Kasuga , Fukuoka 816-8580 , Japan
| | - Nobutaka Shioya
- Division of Environmental Chemistry , Institute for Chemical Research, Kyoto University , Gokasho, Uji , Kyoto 611-0011 , Japan
| | - Takafumi Shimoaka
- Division of Environmental Chemistry , Institute for Chemical Research, Kyoto University , Gokasho, Uji , Kyoto 611-0011 , Japan
| | - Takehiro Tamaoka
- The Institute of Scientific and Industrial Research, Osaka University , 8-1 Mihogaoka , Ibaraki , Osaka 567-0047 , Japan
| | - Hideto Yoshida
- The Institute of Scientific and Industrial Research, Osaka University , 8-1 Mihogaoka , Ibaraki , Osaka 567-0047 , Japan
| | - Seiji Takeda
- The Institute of Scientific and Industrial Research, Osaka University , 8-1 Mihogaoka , Ibaraki , Osaka 567-0047 , Japan
| | - Takao Yasui
- Department of Biomolecular Engineering, School of Engineering , Nagoya University , Furo-cho, Chikusa-ku, Nagoya 464-8603 , Japan
| | - Yoshinobu Baba
- Department of Biomolecular Engineering, School of Engineering , Nagoya University , Furo-cho, Chikusa-ku, Nagoya 464-8603 , Japan
| | - Yuriko Aoki
- Interdisciplinary Graduate School of Engineering Sciences , Kyushu University , 6-1 Kasuga-Koen , Kasuga , Fukuoka 816-8580 , Japan
| | - Jun Terao
- Department of Basic Science, Graduate School of Arts and Sciences , The University of Tokyo , Meguro-ku, Tokyo 153-8902 , Japan
| | - Takeshi Hasegawa
- Division of Environmental Chemistry , Institute for Chemical Research, Kyoto University , Gokasho, Uji , Kyoto 611-0011 , Japan
| | - Takeshi Yanagida
- Interdisciplinary Graduate School of Engineering Sciences , Kyushu University , 6-1 Kasuga-Koen , Kasuga , Fukuoka 816-8580 , Japan
- Institute for Materials Chemistry and Engineering, Kyushu University , 6-1 Kasuga-Koen , Kasuga , Fukuoka 816-8580 , Japan
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Effect of H2O and O2 on the Adsorption and Degradation of Acetaldehyde on Anatase Surfaces—An In Situ ATR-FTIR Study. Catalysts 2018. [DOI: 10.3390/catal8100417] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The effect of H2O and O2 on the adsorption and degradation of gaseous acetaldehyde on the anatase TiO2 surface has been studied, in the dark and upon UV illumination, at ambient temperatures. The processes occurring at the surface have been elucidated by means of in situ ATR–FTIR (Attenuated Total Reflection—Fourier Transform Infrared) spectroscopy, while gas detectors allowed the analysis of the adducts and products in the gas phase. In the dark and under dry conditions acetaldehyde reacts independently of the atmosphere, upon aldol condensation to crotonaldehyde. However, under humid conditions, this reaction was prevented due to the replacement of the adsorbed acetaldehyde molecules, by water molecules. Upon UV illumination under oxygenic conditions, acetaldehyde was decomposed to acetate and formate. Under an N2 atmosphere, the formation of acetate and formate was observed during the first hour of illumination, until all adsorbed oxygen had been consumed. In the absence of molecular oxygen acetate, methane, and CO2 were detected, the formation of which most likely involved the participation of the bridging O atoms, within the TiO2 lattice.
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Sun Z, Kong L, Ding X, Du C, Zhao X, Chen J, Fu H, Yang X, Cheng T. The effects of acetaldehyde, glyoxal and acetic acid on the heterogeneous reaction of nitrogen dioxide on gamma-alumina. Phys Chem Chem Phys 2016; 18:9367-76. [PMID: 26745767 DOI: 10.1039/c5cp05632b] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Heterogeneous reactions of nitrogen oxides on the surface of aluminium oxide result in the formation of adsorbed nitrite and nitrate. However, little is known about the effects of other species on these heterogeneous reactions and their products. In this study, diffuse reflectance infrared spectroscopy (DRIFTS) was used to analyze the process of the heterogeneous reaction of NO2 on the surface of aluminium oxide particles in the presence of pre-adsorbed organic species (acetaldehyde, glyoxal and acetic acid) at 298 K and reveal the influence of these organic species on the formation of adsorbed nitrite and nitrate. It was found that the pre-adsorption of organic species (acetaldehyde, glyoxal and acetic acid) on γ-Al2O3 could suppress the formation of nitrate to different extents. Under the same experimental conditions, the suppression of the formation of nitrate by the pre-adsorption of acetic acid is much stronger than that by pre-adsorption of acetaldehyde and glyoxal, indicating that the influence of acetic acid on the heterogeneous reaction of NO2 is different from that of acetaldehyde and glyoxal. Surface nitrite is formed and identified to be an intermediate product. For the heterogeneous reaction of NO2 on the surface of γ-Al2O3 with and without the pre-adsorption of acetaldehyde and glyoxal, it is firstly formed and then gradually disappears as the reaction proceeds, but for the reaction with the pre-adsorption of acetic acid, it is the final main product besides nitrate. This indicates that the pre-adsorption of acetic acid would promote the formation of nitrite, while the others would not change the trend of the formation of nitrite. The possible influence mechanisms of the pre-adsorption of acetaldehyde, glyoxal and acetic acid on the heterogeneous conversion of NO2 on γ-Al2O3 are proposed and atmospheric implications based on these results are discussed.
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Affiliation(s)
- Zhenyu Sun
- Shanghai Key Laboratory of Atmospheric Particle Pollution, Prevention, Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, China.
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Saha S, Rajput L, Joseph S, Mishra MK, Ganguly S, Desiraju GR. IR spectroscopy as a probe for C–H⋯X hydrogen bonded supramolecular synthons. CrystEngComm 2015. [DOI: 10.1039/c4ce02034k] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
We describe a five step IR spectroscopic method that identifies supramolecular synthons in weak hydrogen bonded dimer assemblies, bifurcated systems, and π-electron mediated synthons.
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Affiliation(s)
- Subhankar Saha
- Solid State and Structural Chemistry Unit
- Indian Institute of Science
- Bangalore 560 012, India
| | - Lalit Rajput
- Solid State and Structural Chemistry Unit
- Indian Institute of Science
- Bangalore 560 012, India
| | - Sumy Joseph
- Solid State and Structural Chemistry Unit
- Indian Institute of Science
- Bangalore 560 012, India
| | - Manish Kumar Mishra
- Solid State and Structural Chemistry Unit
- Indian Institute of Science
- Bangalore 560 012, India
| | - Somnath Ganguly
- Solid State and Structural Chemistry Unit
- Indian Institute of Science
- Bangalore 560 012, India
| | - Gautam R. Desiraju
- Solid State and Structural Chemistry Unit
- Indian Institute of Science
- Bangalore 560 012, India
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Effect of the Amount of Water in the Synthesis of B-TiO2: Orange II Photodegradation. ACTA ACUST UNITED AC 2014. [DOI: 10.1155/2014/721216] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A series of boron-doped TiO2 photocatalysts (2% B-TiO2) with different water/alkoxide molar ratio were synthesized by conventional sol-gel method. The prepared samples were characterized by BET measurement, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIRS), and diffuse-reflectance UV-vis. The phase anatase was present, but unexpectedly a small amount of rutile phase was formed with low and excess water in the synthesis. Additionally it has been observed that the increase in the molar ratio of water significantly increases the values of band gap energy and the specific surface area. Results showed that degradation of Orange II azo dye increases with surface area, particle size, boron, and water content in photocatalysis. The boron species were introduced in the tricoordinated form.
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