Practical room temperature formaldehyde sensing based on a combination of visible-light activation and dipole modification

Liang, Hongping; Guo, Lanpeng; Cao, Nengjie; Hu, Huiyun; Li, Hao; Rooij, N. F. de; Algarni, H.; Wang, Yao; Zhou, Guofu

doi:10.1039/d1ta06346d

Cited by 23 publications

(34 citation statements)

References 74 publications

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“…In addition, an all-around comparison between the sensing performance of the V O -rich ZnO sensor fabricated in this work and other recent reports about HCHO gas sensors 13 , 22 , 39 , 70 , 80 − 86 is summarized in Table 2 . The performance indexes showed by the V O -rich ZnO sensor were considered to be pre-eminent on the whole.…”

Section: Resultsmentioning

confidence: 94%

“…There exist three basic consensuses for the roles played by V O in material behaviors. First, V O , possessing abundant localized electrons, generally acts as an electron donor 59 , 60 , 62 , 65 − 67 , 69 , 70 and manipulates the carrier density (bulk resistance) of semiconductor materials, 59 , 60 , 62 especially for n-type metal oxides. As interfacial defects, the electron-rich nature of oxygen vacancies will facilitate the adsorption of O 2 molecules and increase the content of chemisorbed oxygen species.…”

Section: Introductionmentioning

confidence: 99%

“… 58 , 60 , 69 , 70 Through greatly extending the lifetime of activated carriers, V O favors the charge-transfer efficiency in bulk materials. 58 , 60 , 67 , 69 , 70 Besides, the concomitance of isolated energy levels with V O promotes light absorption. 60 , 62 In conclusion, V O engineering is highly conducive to generating outstanding visible light-catalyzed gas-sensing performance.…”

Section: Introductionmentioning

confidence: 99%

“… 59 , 60 , 62 , 70 Third, V O can trap photoinduced electrons and prompt the separation of photogenerated electron/hole pairs. 58 , 60 , 69 , 70 Through greatly extending the lifetime of activated carriers, V O favors the charge-transfer efficiency in bulk materials. 58 , 60 , 67 , 69 , 70 Besides, the concomitance of isolated energy levels with V O promotes light absorption.…”

Section: Introductionmentioning

confidence: 99%

“…V O has been widely recognized and practically utilized to modulate the electronic and surface properties of metal oxides, − which effectively improves gas-sensing performances of chemiresistor-type sensors. There exist three basic consensuses for the roles played by V O in material behaviors.…”

Section: Introductionmentioning

confidence: 99%

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Visible Light-Induced Room-Temperature Formaldehyde Gas Sensor Based on Porous Three-Dimensional ZnO Nanorod Clusters with Rich Oxygen Vacancies

et al. 2022

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Oxygen vacancy (V O ) is a kind of primary point defect that extensively exists in semiconductor metal oxides (SMOs). Owing to some of its inherent qualities, an artificial manipulation of V O content in one material has evolved into a hot research field, which is deemed to be capable of modulating band structures and surface characteristics of SMOs. Specific to the gas-sensing area, V O engineering of sensing materials has become an effective means in enhancing sensor response and inducing light-enhanced sensing. In this work, a high-efficiency microwave hydrothermal treatment was utilized to prepare a V O -rich ZnO sample without additional reagents. The X-ray photoelectron spectroscopy test revealed a significant increase in V O proportion, which was from 9.21% in commercial ZnO to 36.27% in synthesized V O -rich ZnO possessing three-dimensional and air-permeable microstructures. The subsequent UV–vis–NIR absorption and photoluminescence spectroscopy indicated an extension absorption in the visible region and band gap reduction of V O -rich ZnO. It turned out that the V O -rich ZnO-based sensor exhibited a considerable response of 63% toward 1 ppm HCHO at room temperature (RT, 25 °C) under visible light irradiation. Particularly, the response/recovery time was only 32/20 s for 1 ppm HCHO and further shortened to 10/5 s for 10 ppm HCHO, which was an excellent performance and comparable to most sensors working at high temperatures. The results in this work strongly suggested the availability of V O engineering and also provided a meaningful candidate for researchers to develop high-performance RT sensors detecting volatile organic compounds.

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Section: Resultsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Visible Light-Induced Room-Temperature Formaldehyde Gas Sensor Based on Porous Three-Dimensional ZnO Nanorod Clusters with Rich Oxygen Vacancies

et al. 2022

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A Plant‐inspired Light Transducer for High‐performance Near‐infrared Light Mediated Gas Sensing

Liang

Guo

et al. 2023

Adv Funct Materials

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Constructing near‐infrared light (NIR) light‐enhanced room temperature gas sensors is becoming more promising for practical application. In this study, learning from the structure and photosynthetic process of chlorophyll thylakoid membranes in plants, the first “Thylakoid membrane” structural formaldehyde (HCHO) sensor is constructed by matching the upconversion emission of the lanthanide‐doped upconversion nanoparticles (UCNPs) and the UV–vis adsorption of the as‐prepared nanocomposites. The NIR‐mediated sensor exhibits excellent performances, including ultra‐high response (Ra / Rg = 2.22, 1 ppm), low practical limit of detection (50 ppb), reliable repeatability, high selectivity, and broadband spectral response. The practicality of the NIR‐mediated gas sensor is confirmed through the remote and external stimulation test. A study of sensing mechanism demonstrates that it is the UCNPs‐based light transducer produces more light‐induced oxygen species for gas response in the process of non‐radiative/radiative energy transfer, playing a key role in significantly improving the sensing properties of the sensor. The universality of NIR‐mediated gas sensors based on UCNPs is verified using ZnO, In2O3, and SnO2 systems. This work paves a way for fabricating high‐performance NIR‐mediated gas sensors and will expand the application fields of NIR light.

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ZnO-activated SnO2–TiO2 ternary nanocomposite based highly selective formaldehyde sensor at room temperature

2023

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Practical room temperature formaldehyde sensing based on a combination of visible-light activation and dipole modification

Abstract: Implementing sensitive and fast ppb-level formaldehyde sensing at room temperature is still extremely demanded for practical indoor air quality monitoring. Herein, we developed a visible-light sensitive and dipole modified graphene-based...

Cited by 23 publications

References 74 publications

Visible Light-Induced Room-Temperature Formaldehyde Gas Sensor Based on Porous Three-Dimensional ZnO Nanorod Clusters with Rich Oxygen Vacancies

Visible Light-Induced Room-Temperature Formaldehyde Gas Sensor Based on Porous Three-Dimensional ZnO Nanorod Clusters with Rich Oxygen Vacancies

A Plant‐inspired Light Transducer for High‐performance Near‐infrared Light Mediated Gas Sensing

ZnO-activated SnO2–TiO2 ternary nanocomposite based highly selective formaldehyde sensor at room temperature

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