Formation of Metal-Organic Decomposition Derived Nanocrystalline Structure Titanium Dioxide by Heat Sintering and Photosintering Methods for Advanced Coating Process, and Its Volatile Organic Compounds’ Gas-Sensing Properties

2020 ◽  
Vol 2 (6) ◽  
pp. 1670-1678 ◽  
Author(s):  
Tohru Sugahara ◽  
Leila Alipour ◽  
Yukiko Hirose ◽  
Yusufu Ekubaru ◽  
Jun-ichi Nakamura ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Gas Sensing ◽  
Nanocrystalline Structure ◽  
Coating Process ◽  
Gas Sensing Properties ◽  
Volatile Organic ◽  
Metal Organic ◽  
Organic Decomposition

FILMS SPIN-COATED WITH GALLIC ACID AND THE DETECTION OF SPUN FILMS AGAINST VOLATILE ORGANIC COMPOUNDS

2019 ◽  
Vol 27 (02) ◽  
pp. 1950106
Author(s):  
SİBEL ŞEN
Keyword(s):  
Thin Films ◽  
Volatile Organic Compounds ◽  
Gallic Acid ◽  
Organic Compounds ◽  
Gas Sensing ◽  
Quartz Substrate ◽  
Methanol Vapor ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Volatile Organic

To determine thin films’ properties of commercially available gallic acid molecule, they were deposited onto a suitable substrate using spin coater. UV–Visible absorption spectroscopy and atomic force microscopy (AFM) were employed for the characterization of the deposited thin films. Characterization results obtained by these two techniques indicated that the gallic acid molecules are suitable for transfer onto a glass or quartz substrate. Gas-sensing properties and thickness of these thin films were elucidated using surface plasmon resonance (SPR). Thickness values of spun thin films were obtained at different spinning speeds. Then, the gas-sensing properties were examined by exposing them to the vapors of four volatile organic compounds (VOCs). It was found that the spun films of this material were selective for methanol vapor yielding rapid response and recovery time and thin films of gallic acid exhibited reversible changes in the optical behavior, which makes them suitable for practical methanol-detection applications.

Volatile Organic Compounds Gas Sensing Properties of ZnO Nanorings

2011 ◽  
Vol 9 (2) ◽  
pp. 845-849 ◽  
Author(s):  
Shao-Lin Zhang ◽  
Bong-Hwan Cho ◽  
Joon-Boo Yu ◽  
Jeong-Ok Lim ◽  
Hyung-Gi Byun ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Gas Sensing ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Volatile Organic

scholarly journals Metal-Organic Frameworks for Advanced Transducers based Gas Sensors: Review and Perspectives

2022 ◽  
Author(s):  
Sanjit Manohar Majhi ◽  
Ashraf Ali ◽  
Prabhakar Rai ◽  
Yaser Greish ◽  
Ahmed Alzamly ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Gas Sensors ◽  
Gas Sensing ◽  
Metal Organic Frameworks ◽  
The Past ◽  
Volatile Organic ◽  
Metal Organic

The development of gas sensing devices to detect environmentally toxic, hazardous, and volatile organic compounds (VOCs) has witnessed a surge of immense interest over the past few decades, motivated mainly...

scholarly journals Volatile Organic Compound Vapour Measurements Using a Localised Surface Plasmon Resonance Optical Fibre Sensor Decorated with a Metal-Organic Framework

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1420
Author(s):  
Chenyang He ◽  
Liangliang Liu ◽  
Sergiy Korposh ◽  
Ricardo Correia ◽  
Stephen P. Morgan
Keyword(s):  
Surface Plasmon Resonance ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Surface Plasmon ◽  
Optical Fibre ◽  
Plasmon Resonance ◽  
Metal Organic Framework ◽  
Volatile Organic ◽  
Metal Organic ◽  
Organic Framework

A tip-based fibreoptic localised surface plasmon resonance (LSPR) sensor is reported for the sensing of volatile organic compounds (VOCs). The sensor is developed by coating the tip of a multi-mode optical fibre with gold nanoparticles (size: 40 nm) via a chemisorption process and further functionalisation with the HKUST-1 metal–organic framework (MOF) via a layer-by-layer process. Sensors coated with different cycles of MOFs (40, 80 and 120) corresponding to different crystallisation processes are reported. There is no measurable response to all tested volatile organic compounds (acetone, ethanol and methanol) in the sensor with 40 coating cycles. However, sensors with 80 and 120 coating cycles show a significant redshift of resonance wavelength (up to ~9 nm) to all tested volatile organic compounds as a result of an increase in the local refractive index induced by VOC capture into the HKUST-1 thin film. Sensors gradually saturate as VOC concentration increases (up to 3.41%, 4.30% and 6.18% in acetone, ethanol and methanol measurement, respectively) and show a fully reversible response when the concentration decreases. The sensor with the thickest film exhibits slightly higher sensitivity than the sensor with a thinner film. The sensitivity of the 120-cycle-coated MOF sensor is 13.7 nm/% (R2 = 0.951) with a limit of detection (LoD) of 0.005% in the measurement of acetone, 15.5 nm/% (R2 = 0.996) with an LoD of 0.003% in the measurement of ethanol and 6.7 nm/% (R2 = 0.998) with an LoD of 0.011% in the measurement of methanol. The response and recovery times were calculated as 9.35 and 3.85 min for acetone; 5.35 and 2.12 min for ethanol; and 2.39 and 1.44 min for methanol. The humidity and temperature crosstalk of 120-cycle-coated MOF was measured as 0.5 ± 0.2 nm and 0.5 ± 0.1 nm in the humidity range of 50–75% relative humidity (RH) and temperature range of 20–25 °C, respectively.

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