Self-regenerating photocatalytic sensor based on dielectrophoretically assembled TiO2 nanowires for chemical vapor sensing

Wang, Shengqin; Lin, Zi-Xiang; Wang, Wei-Han; Kuo, Chien Lin; Hwang, Kuo Chu; Hong, Chien-Chong

doi:10.1016/j.snb.2013.12.042

Cited by 30 publications

(23 citation statements)

References 29 publications

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“…They thought this might be due to the fact that colloidal TiO 2 nanowires could still contain Ti(OH) m on the surface which would decrease the sensing property because the solution-made TiO 2 nanowires were fabricated in NaOH solution. However, it was also very possible that the effect was attributed to the smaller diameter of the electrospun-made TiO 2 nanowires, i.e., 80 nm, and the diameter of the one made from a hydrolysis approach was 550 nm ( Figure 25 ) [ 60 ].…”

Section: Pure Metal Oxide Materials For Gas Sensingmentioning

confidence: 99%

“… Dynamic response and recovery of sensors based on TiO 2 nanowires towards vapors with a concentration of 100 ppm: ( a ) sensor based on 2 nanowires synthesized by hydrolysis approach and ( b ) sensor based on 3 nanowires synthesized by electrospinning. Reproduced with permission from [ 60 ]. …”

Section: Figurementioning

confidence: 99%

“… Scanning electron microscopy (SEM) images of TiO 2 nanowires made from hydrolysis ( a , b ) and from electrospinning ( c , d ). Reproduced with permission from [ 60 ]. …”

Section: Figurementioning

confidence: 99%

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Light-Activated Metal Oxide Gas Sensors: A Review

Fang

2017

Micromachines

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Conductometric gas sensors facilitated by photons have been investigated for decades. Light illumination may enhance device attributes including operational temperature, sensing sensitivity and selectivity. This paper aims to provide an overview on the progress of light-activated gas sensors, with a specific focus on sensors based on metal oxides. The material systems that have been studied include pure metal oxides, heterostructures of semiconductor-metal oxides and metal-metal oxides, and metal oxides with dopant. Other reported works on the use of different nanostructures such as one-dimensional and porous nanostructures, study of sensing mechanisms and the interplay between various factors are also summarized. Possible directions for further improvement of sensing properties, through optimizing the size of nanomaterials, film thickness, light intensity and wavelength are discussed. Finally, we point out that the main challenge faced by light-activated gas sensors is their low optical response, and we have analyzed the feasibility of using localized surface plasmon resonance to solve this drawback. This article should offer readers some key and instructive insights into the current and future development of light-activated gas sensors.

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Section: Pure Metal Oxide Materials For Gas Sensingmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

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Light-Activated Metal Oxide Gas Sensors: A Review

Fang

2017

Micromachines

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“…Systems for monitoring and detecting gases require the application of sensitive sensors, allowing one to detect and to determine low concentrations of single parts per million (ppm), and even parts per billion (ppb) in the air [ 1 , 2 ]. Gas sensors can also be used in medical diagnostics [ 3 , 4 ], in the chemical and food industry [ 5 , 6 ], and also in other fields [ 7 , 8 , 9 ]. Nitrogen oxides (NO x ) constitute an important group of toxic gases, whose concentrations must be controlled due to their considerable detrimental effects.…”

Section: Introductionmentioning

confidence: 99%

A Study of a QCM Sensor Based on TiO2 Nanostructures for the Detection of NO2 and Explosives Vapours in Air

Procek

Stolarczyk

Pustelny

2015

Sensors

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The paper deals with investigations concerning the construction of sensors based on a quartz crystal microbalance (QCM) containing a TiO2 nanostructures sensor layer. A chemical method of synthesizing these nanostructures is presented. The prepared prototype of the QCM sensing system, as well as the results of tests for detecting low NO2 concentrations in an atmosphere of synthetic air have been described. The constructed NO2 sensors operate at room temperature, which is a great advantage, because resistance sensors based on wide gap semiconductors often require much higher operation temperatures, sometimes as high as 500 °C. The sensors constructed by the authors can be used, among other applications, in medical and chemical diagnostics, and also for the purpose of detecting explosive vapours. Reactions of the sensor to nitroglycerine vapours are presented as an example of its application. The influence of humidity on the operation of the sensor was studied.

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“…Metal oxide sensors have been the subject of intense research for many years because of their potential to produce small, inexpensive sensors capable of not only detecting a range of gases at levels of only a few parts per million, but also distinguishing between these gases in a selective manner. The unifying feature of many of these sensors is their use of a metal oxide such as SnO 2 [1,2], TiO 2 [3,4] or ZnO [5,6], either as a thin polycrystalline film or in the form of nanostructures. Devices range from simple resistive sensors [7][8][9][10][11][12] to more complicated setups which utilise metallic gates [13,14].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the kinetics of surface reactions on a zinc oxide nanosheet-based carbon monoxide sensor using an Eley–Rideal model

Jones

Maffeïs

2015

Sensors and Actuators B: Chemical

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Herein, we experimentally test a mathematical model of the reactions on the surface of a zinc oxide nanosheet-based carbon monoxide sensor. The carbon monoxide is assumed to react with surface oxygen via an Eley-Rideal mechanism, considering only the direct reaction between the two species. We demonstrate that the measured resistance responses of the system are well described by the model, facilitating further analysis of the physical rate constants in the system. By initially considering the system in the absence of any reducing gas, it is shown that various reaction parameters may be precisely estimated. For instance, fitting the model to response curves obtained at different temperatures shows the activation energy of the reaction between oxygen ions and carbon monoxide to be 54 ± 9 kJ mol-1 , whereas the recovery curves yield an estimate of 42 ± 7 kJ mol-1. Similarly, the energy barrier for the formation of oxygen ions is found to equal 72 ± 9 kJ mol-1 from the sensor response and 63 ± 10 kJ mol-1 from the recovery. These estimates are in agreement with values quoted elsewhere in the literature, corroborating the validity of the model. In the absence of surface ions, the energy difference between the Fermi level and the conduction band minimum at the surface is estimated as 590 ± 90 meV.

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Self-regenerating photocatalytic sensor based on dielectrophoretically assembled TiO2 nanowires for chemical vapor sensing

Cited by 30 publications

References 29 publications

Light-Activated Metal Oxide Gas Sensors: A Review

Light-Activated Metal Oxide Gas Sensors: A Review

A Study of a QCM Sensor Based on TiO2 Nanostructures for the Detection of NO2 and Explosives Vapours in Air

Analysis of the kinetics of surface reactions on a zinc oxide nanosheet-based carbon monoxide sensor using an Eley–Rideal model

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