In-situ growth of mesoporous In2O3 nanorod arrays on a porous ceramic substrate for ppb-level NO2 detection at room temperature

Shen, Yanbai; Zhong, Xiangxi; Zhang, Jin; Li, Tingting; Zhao, Sikai; Cui, Baoyu; Wei, Dezhou; Zhang, Yunhai; Wei, Kefeng

doi:10.1016/j.apsusc.2019.143873

Cited by 74 publications

(24 citation statements)

References 52 publications

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“…Meanwhile, the response was observed to be affected by UV light intensity. Recently, Shen and co-workers demonstrated that mesoporous In 2 O 3 nanorod arrays could detect NO 2 at a ppb-level concentration at RT without UV illumination, but the sensor showed very poor recovery [ 79 ]. They showed that the recovery could be improved to 32 s by using UV illumination.…”

Section: Photoactivated Metal Oxide Semiconductorsmentioning

confidence: 99%

Room-Temperature Gas Sensors Under Photoactivation: From Metal Oxides to 2D Materials

et al. 2020

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Room-temperature gas sensors have aroused great attention in current gas sensor technology because of deemed demand of cheap, low power consumption and portable sensors for rapidly growing Internet of things applications. As an important approach, light illumination has been exploited for room-temperature operation with improving gas sensor’s attributes including sensitivity, speed and selectivity. This review provides an overview of the utilization of photoactivated nanomaterials in gas sensing field. First, recent advances in gas sensing of some exciting different nanostructures and hybrids of metal oxide semiconductors under light illumination are highlighted. Later, excellent gas sensing performance of emerging two-dimensional materials-based sensors under light illumination is discussed in details with proposed gas sensing mechanism. Originated impressive features from the interaction of photons with sensing materials are elucidated in the context of modulating sensing characteristics. Finally, the review concludes with key and constructive insights into current and future perspectives in the light-activated nanomaterials for optoelectronic gas sensor applications.

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Section: Photoactivated Metal Oxide Semiconductorsmentioning

confidence: 99%

Room-Temperature Gas Sensors Under Photoactivation: From Metal Oxides to 2D Materials

et al. 2020

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“…The widespread use of low-power UV LEDs to activate the sensor sensitivity of semiconductor oxides has led to increased publication activity in this area since the 2010s. To date, numerous studies have been published on the effect of UV radiation on the activation of the sensor sensitivity of semiconductor oxides, such as SnO 2 [ 35 , 36 ], In 2 O 3 [ 37 , 38 , 39 , 40 , 41 , 42 , 43 ], ZnO [ 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 ], WO 3 [ 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 ], and TiO 2 [ 60 , 61 , 62 , 63 , 64 ], of various morphologies. Despite the fact that in some cases the obtained materials demonstrated high sensor sensitivity, many authors noted the low selectivity of materials based on individual binary metal oxides.…”

Section: Activation Of Gas Sensitivity Of Semiconductor Metal Oxides Under Uv Lightmentioning

confidence: 99%

“…Other works suggest more complex processes describing the transformations of NO 2 molecules during chemisorption on semiconductor oxides [ 43 , 81 ]:

…”

Section: Mechanisms Of Light Activated Gas Sensingmentioning

confidence: 99%

Light Activation of Nanocrystalline Metal Oxides for Gas Sensing: Principles, Achievements, Challenges

2021

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The review deals with issues related to the principle of operation of resistive semiconductor gas sensors and the use of light activation instead of thermal heating when detecting gases. Information on the photoelectric and optical properties of nanocrystalline oxides SnO2, ZnO, In2O3, and WO3, which are the most widely used sensitive materials for semiconductor gas sensors, is presented. The activation of the gas sensitivity of semiconductor materials by both UV and visible light is considered. When activated by UV light, the typical approaches for creating materials are (i) the use of individual metal oxides, (ii) chemical modification with nanoparticles of noble metals and their oxides, (iii) and the creation of nanocomposite materials based on metal oxides. In the case of visible light activation, the approaches used to enhance the photo- and gas sensitivity of wide-gap metal oxides are (i) doping; (ii) spectral sensitization using dyes, narrow-gap semiconductor particles, and quantum dots; and (iii) addition of plasmon nanoparticles. Next, approaches to the description of the mechanism of the sensor response of semiconductor sensors under the action of light are considered.

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“…The RT gas sensors, using metal oxide semiconductors, utilize photoactivation, which is a viable alternative to thermal activation, thereby lowering the working temperature. Because various nanostructures have been found to further improve the sensor performance at RT, RT gas sensors with nanostructures that use photonic energy have been developed in many recent studies [ 16 , 17 , 18 , 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

TiO2 Nanorods and Pt Nanoparticles under a UV-LED for an NO2 Gas Sensor at Room Temperature

Noh

Kwon

Park

et al. 2021

Sensors

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Because the oxides of nitrogen (NOx) cause detrimental effects on not only the environment but humans, developing a high-performance NO2 gas sensor is a crucial issue for real-time monitoring. To this end, metal oxide semiconductors have been employed for sensor materials. Because in general, semiconductor-type gas sensors require a high working temperature, photoactivation has emerged as an alternative method for realizing the sensor working at room temperature. In this regard, titanium dioxide (TiO2) is a promising material for its photocatalytic ability with ultraviolet (UV) photonic energy. However, TiO2-based sensors inevitably encounter a problem of recombination of photogenerated electron-hole pairs, which occurs in a short time. To address this challenge, in this study, TiO2 nanorods (NRs) and Pt nanoparticles (NPs) under a UV-LED were used as an NO2 gas sensor to utilize the Schottky barrier formed at the TiO2-Pt junction, thereby capturing the photoactivated electrons by Pt NPs. The separation between the electron-hole pairs might be further enhanced by plasmonic effects. In addition, it is reported that annealing TiO2 NRs can achieve noteworthy improvements in sensing performance. Elucidation of the performance enhancement is suggested with the investigation of the X-ray diffraction patterns, which implies that the crystallinity was improved by the annealing process.

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In-situ growth of mesoporous In2O3 nanorod arrays on a porous ceramic substrate for ppb-level NO2 detection at room temperature

Cited by 74 publications

References 52 publications

Room-Temperature Gas Sensors Under Photoactivation: From Metal Oxides to 2D Materials

Room-Temperature Gas Sensors Under Photoactivation: From Metal Oxides to 2D Materials

Light Activation of Nanocrystalline Metal Oxides for Gas Sensing: Principles, Achievements, Challenges

TiO2 Nanorods and Pt Nanoparticles under a UV-LED for an NO2 Gas Sensor at Room Temperature

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