UV light activation of TiO2 for sensing formaldehyde: How to be sensitive, recovering fast, and humidity less sensitive

Zhang, Shunping; Tao, Lei; Liu, Dong; Zhang, Guozhu; Xie, Changsheng

doi:10.1016/j.snb.2014.06.063

Cited by 79 publications

(49 citation statements)

References 22 publications

(31 reference statements)

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“…The n-type wide-bandgap semiconductor TiO 2 with porous nanostructure has been explored for chemoresistive-type gas sensing materials [10][11][12][13][14][15][16][17][18][19][20]. The highly-ordered TiO 2 nanotube array was reported to detect hydrogen (sometimes in combination with Pd electrodes or Pd surface coating), ammonia and formaldehyde [12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

“…The highly-ordered TiO 2 nanotube array was reported to detect hydrogen (sometimes in combination with Pd electrodes or Pd surface coating), ammonia and formaldehyde [12][13][14][15][16][17][18][19]. Taking the advantage of the unique photocatalytic properties of nanostructured TiO 2 , the TiO 2 based gas sensors could operate well even at room-temperature in the humidity with the assistance of UV irradiation [17][18][19]. It has been recently reported the room-temperature formaldehyde sensors using the porous, nanotube-shaped TiO 2 with UV assistance [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

“…Taking the advantage of the unique photocatalytic properties of nanostructured TiO 2 , the TiO 2 based gas sensors could operate well even at room-temperature in the humidity with the assistance of UV irradiation [17][18][19]. It has been recently reported the room-temperature formaldehyde sensors using the porous, nanotube-shaped TiO 2 with UV assistance [17][18][19]. The sensor showed excellent sensitivity to formaldehyde in the humid air.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

NiO-wrapped mesoporous TiO2 microspheres based selective ammonia sensor at room temperature

Chen

Lin

et al. 2015

Sensors and Actuators B: Chemical

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

NiO-wrapped mesoporous TiO2 microspheres based selective ammonia sensor at room temperature

Chen

Lin

et al. 2015

Sensors and Actuators B: Chemical

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“…There are also other possibilities to enhance the response and increase the sensitivity of semiconductor gas sensors, especially optical excitation, which has been addressed by various groups [27,28]. Especially excitation with quantum energy above the bandgap energy of the semiconductor allows low-temperature operation and/or achieves higher sensitivity.…”

Section: Highly Sensitive Semiconductor Gas Sensor Principlesmentioning

confidence: 99%

“…For VOC monitoring, selective identification of hazardous VOCs down to concentrations of 1 ppb could be demonstrated even in a background of other VOCs of several ppm and against changing humidity using a commercial ceramic MOX sensor at least under lab conditions [14]; similarly, quantification of VOCs at low ppb levels was demonstrated with this approach both for MOS [26] and SiC-FET [15,37] sensors. Further approaches to improve the performance of semiconductor gas sensor systems with dynamic operation are optical excitation [27,28] and impedance spectroscopy [38] often applied to MOX sensors or gate bias cycled operation for GasFETs [39]. These approaches can also be combined to boost the selectivity further [40,41].…”

Section: Highly Selective Sensor Systemsmentioning

confidence: 99%

Highly Sensitive and Selective VOC Sensor Systems Based on Semiconductor Gas Sensors: How to?

et al. 2017

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Abstract:Monitoring of volatile organic compounds (VOCs) is of increasing importance in many application fields such as environmental monitoring, indoor air quality, industrial safety, fire detection, and health applications. The challenges in all of these applications are the wide variety and low concentrations of target molecules combined with the complex matrix containing many inorganic and organic interferents. This paper will give an overview over the application fields and address the requirements, pitfalls, and possible solutions for using low-cost sensor systems for VOC monitoring. The focus lies on highly sensitive metal oxide semiconductor gas sensors, which show very high sensitivity, but normally lack selectivity required for targeting relevant VOC monitoring applications. In addition to providing an overview of methods to increase the selectivity, especially virtual multisensors achieved with dynamic operation, and boost the sensitivity further via novel pro-concentrator concepts, we will also address the requirement for high-performance gas test systems, advanced solutions for operating and read-out electronic, and, finally, a cost-efficient factory and on-site calibration. The various methods will be primarily discussed in the context of requirements for monitoring of indoor air quality, but can equally be applied for environmental monitoring and other fields.

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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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UV light activation of TiO2 for sensing formaldehyde: How to be sensitive, recovering fast, and humidity less sensitive

Cited by 79 publications

References 22 publications

NiO-wrapped mesoporous TiO2 microspheres based selective ammonia sensor at room temperature

NiO-wrapped mesoporous TiO2 microspheres based selective ammonia sensor at room temperature

Highly Sensitive and Selective VOC Sensor Systems Based on Semiconductor Gas Sensors: How to?

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

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