Hierarchically Structured Suspended TiO<sub>2</sub> Nanofibers for Use in UV and pH Sensor Devices

Lee, Won Seok; Park, Yang-Seok; Cho, Yoon‐Kyoung

doi:10.1021/am501563v

Cited by 37 publications

(23 citation statements)

References 47 publications

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“…This indicates that the UV light sensor has not only a high response, but also a good reversibility. Compared with other reported UV sensors based on different metal oxide materials in the literature, such as WO3 [29], SnO2 [30], TiO2 [31] and ZnO [32,33], the UV sensors based on porous In2O3 nanoparticles in this study have better sensing performance (i.e., the response) than most UV sensors at room temperature.…”

Section: Structure and Morphology Of Samplesmentioning

confidence: 68%

Ultra-sensitive UV and H2S dual functional sensors based on porous In2O3 nanoparticles operated at room temperature

Yan

Zhang

et al. 2019

Journal of Alloys and Compounds

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2019) Ultra-sensitive UV and H2S dual functional sensors based on porous In2O3 nanoparticles operated at room temperature. Journal of Alloys and Compounds, 770. pp. 721-731. AbstractA dual functional sensor for detecting both UV light and H2S gas was fabricated using the hexagonal phase porous In2O3 nanoparticles, which were prepared using the hydrothermal and calcination process. The porous In2O3 nanoparticles with large surface areas and pore volumes could provide plenty of active sites to produce much active oxygen species, which were beneficial for the UV light and H2S gas sensing reactions, thus resulting in a good sensing performance. At room temperature, the dual functional sensor based on porous In2O3 nanoparticles exhibited ultra-high responses for sensing both UV light (with a wavelength of 365 nm) and H2S gas. As a UV sensor, its response was 12886.0 for a UV power intensity of 1.287 mW/cm 2 and its detection limit was 0.013 mW/cm 2 . As a H2S gas sensor, the sensor exhibited an ultra-high response (26268.5 to 1 ppm H2S) and a very low detection limit (1ppb of H2S), and it also have excellent selectivity, reversibility and stability. 2

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Section: Structure and Morphology Of Samplesmentioning

confidence: 68%

Ultra-sensitive UV and H2S dual functional sensors based on porous In2O3 nanoparticles operated at room temperature

Yan

Zhang

et al. 2019

Journal of Alloys and Compounds

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“…139 The high-concentration H 3 O + in the solution reduces the depletion layer at the surface of n-type TiO 2 nanowires, thus increasing the electrical conductivity of the material. For chemo-resistors, TiO 2 nanowires have been synthesized at the surface of Ti/Carbon nanobers by electrospinning and hydrothermal growth.…”

Section: Isfetmentioning

confidence: 99%

Microfabricated electrochemical pH and free chlorine sensors for water quality monitoring: recent advances and research challenges

et al. 2015

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Continuous, real-time monitoring of the level of pH and free chlorine in drinking water is of great importance to public health. However, it is challenging when conventional analytical instruments, such as bulky pH electrodes and expensive free chlorine meters, are used. These instruments have slow response, are difficult to use, prone to interference from operators, and require frequent maintenance. In contrast, microfabricated electrochemical sensors are cheaper, smaller in size, and highly sensitive.Therefore, these sensors are desirable for online monitoring of pH and free chlorine in water. In this review, we discuss different physical configurations of microfabricated sensors. These configurations include potentiometric electrodes, ion-sensitive field-effect transistors, and chemo-resistors/transistors for electrochemical pH sensing. Also, we identified that micro-amperometric sensors are the dominant ones used for free chlorine sensing. We summarized and compared the structure, operation/sensing mechanism, applicable materials, and performance parameters in terms of sensitivity, sensing range, response time and stability of each type of sensor. We observed that novel sensor structures fabricated by solution processing and operated by smart sensing methodologies may be used for developing pH and free chlorine sensors with high performance and low cost. Finally, we highlighted the importance of the concurrent design of materials, fabrication processes, and electronics for future sensors.

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“…A hierarchical nanostructure of TiO 2 nanowires (TiO 2 NWs) was hydrothermally synthesized onto the TiO 2 /C NFs and utilized as UV and pH sensors. The sensors exhibit a high sensitivity, as well as a stable ohmic contact, owing to the large surface area of the TiO 2 NWs and the carboncarbon contact between the suspended TiO 2 /C NFs and carbon electrodes, as the authors have pointed out 25.…”

Section: Introductionmentioning

confidence: 95%

“…The successful use of this sensor is determined by the pH of the samples in the complex materials, and the results are in agreement with results obtained by a glass electrode. Recently, photoelectrochemical sensors, based on hierarchically structured titanium dioxide (TiO 2 ) nanofibers (NFs), were fabricated using combination of electrospinning, carbon microelectromechanical systems, and hydrothermal reaction 25. A hierarchical nanostructure of TiO 2 nanowires (TiO 2 NWs) was hydrothermally synthesized onto the TiO 2 /C NFs and utilized as UV and pH sensors.…”

Section: Introductionmentioning

confidence: 99%

TiO₂‐modified Carbon Paste Electrode as a Sensor for the Assay of Weak Organic Acids/Bases and Complex Matrix Samples

Simić

Stanić

2015

Electroanalysis

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The construction, general performance characteristics and analytical application of a titanium dioxide–modified carbon paste electrode sensitive to hydrogen ions, based on incorporation of titanium dioxide in a carbon paste matrix, is described. The proposed electrochemical sensor exhibits a linear response in the pH range from 2 to 10, at 25 °C, with a sub‐Nernstian slope. The value of a slope is in a direct correlation with the electrode composition – the optimum content of a titanium dioxide in carbon paste is 30 %. Titanium dioxide‐modified carbon paste electrode shows fast response time and reproducibility, confirmed by different compounds determination in both, individual and complex material, namely, in synthetic and real samples. Besides, the electrode shows high selectivity in the presence of the alkali and the alkaline earth ions as Na+, K+, Ca2+ or Mg2+. The standard deviation of the investigated acids (acetic, oxalic, 5‐sulfosalicylic, p‐toluensulfonic acid, and amino acid‐glycine) and bases (N,N′‐diphenylguanidine and collidine) is less than 1.3 %. The obtained data are compared with those obtained by using a conventional glass pH‐electrode under the same experimental conditions and indicate a high correlation between them.

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Hierarchically Structured Suspended TiO₂ Nanofibers for Use in UV and pH Sensor Devices

Cited by 37 publications

References 47 publications

Ultra-sensitive UV and H2S dual functional sensors based on porous In2O3 nanoparticles operated at room temperature

Ultra-sensitive UV and H2S dual functional sensors based on porous In2O3 nanoparticles operated at room temperature

Microfabricated electrochemical pH and free chlorine sensors for water quality monitoring: recent advances and research challenges

TiO₂‐modified Carbon Paste Electrode as a Sensor for the Assay of Weak Organic Acids/Bases and Complex Matrix Samples

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Hierarchically Structured Suspended TiO2 Nanofibers for Use in UV and pH Sensor Devices

Cited by 37 publications

References 47 publications

Ultra-sensitive UV and H2S dual functional sensors based on porous In2O3 nanoparticles operated at room temperature

Ultra-sensitive UV and H2S dual functional sensors based on porous In2O3 nanoparticles operated at room temperature

Microfabricated electrochemical pH and free chlorine sensors for water quality monitoring: recent advances and research challenges

TiO2‐modified Carbon Paste Electrode as a Sensor for the Assay of Weak Organic Acids/Bases and Complex Matrix Samples

Contact Info

Product

Resources

About

Hierarchically Structured Suspended TiO₂ Nanofibers for Use in UV and pH Sensor Devices

TiO₂‐modified Carbon Paste Electrode as a Sensor for the Assay of Weak Organic Acids/Bases and Complex Matrix Samples