Detection of volatile organic compounds by an interferometric sensor

Martínez-Hipatl, Carlos; Muñoz-Aguirre, Severino; Beltrán-Pérez, G.; Castillo-Mixcóatl, J.; Rosa, Javier Rivera De la

doi:10.1016/j.snb.2010.03.042

Cited by 24 publications

(17 citation statements)

References 13 publications

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“…To estimate the thickness of the adsorbed layer, we assumed a range of refractive indices from 1.33 to 1.4 as the refractive index of adsorbed VOCS. This range of refractive indices represents a variety of organic hydrocarbons [27]. Hence, the reflectance of 4% showed the formation of a 0.85-1 nm adsorbed layer.…”

Section: The Effect Of Adsorption Of Vocs On Spr Reflectancementioning

confidence: 96%

The Effect of Adsorbed Volatile Organic Compounds on an Ultrathin Water Film Measurement

et al. 2020

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Using surface plasmon resonance imaging (SPRi), we have recently shown for the first time the existence of a monolayer water film between droplets during dropwise condensation. This study examines the effect of adsorbed volatile organic compounds (VOCs) on the ultrathin film measurement using SPRi. Further, the work presents the proper surface-treatment process that enables measurements of the ultrathin water layer during high-speed imaging of dropwise condensation at 3000 frame per second. In this study, two methods were applied for cleaning the surface (gold-coated glass)—(1) standard cleaning procedure (SCP) using acetone, isopropyl alcohol, and deionized water and (2) SCP followed by air plasma cleaning. This work discusses the effect of the cleaning procedures on surface roughness, contact angle, and surface chemistry using atomic force microscopy, optical microscopy, and an X-ray photoelectron spectroscope meter. The results showed that SCP before the SPRi is a proper surface-treatment method. The effect of adsorbed VOCs during dropwise condensation on a surface treated with SCP was measured to be 0.0025 (reflectivity unit), which was 70% smaller than the reflectance associated with a monolayer water film. The results of this work confirm a monolayer water film observation during the dropwise condensation, which has been reported before.

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Section: The Effect Of Adsorption Of Vocs On Spr Reflectancementioning

confidence: 96%

The Effect of Adsorbed Volatile Organic Compounds on an Ultrathin Water Film Measurement

et al. 2020

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“…Dielectric films supporting Fabry-Perot (FP) resonances have been widely used for gas and vapour sensing [1][2][3][4][5][6]. Typically such FP based sensors comprise lossless dielectric films with thicknesses on the order of the wavelength of probing light, which enables constructive or destructive interference between waves reflected from different layers.…”

Section: Introductionmentioning

confidence: 99%

“…According to previous studies [4][5][6] for sensing systems made of lossless dielectrics, the presence of target analytes only causes a small change in the real part of refractive index n, whereas it doesn't affect the absorption coefficient κ. In such structures, changes in the sensing signal mainly arise from the modification of thickness of the sensing layers, e.g., sensing layers made of polymers may swell in the presence of specific vapours.…”

Section: Introductionmentioning

confidence: 99%

Resonant absorption in dielectric thin films for humidity sensing

Kumari

Ding

Blaikie

2017

IJNT

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We have designed and fabricated novel humidity sensors based on thin-film systems capable of sustaining optical resonances in subwavelength thick absorbing dielectric coatings on reflecting surfaces, as a result of coupling between molecular absorption and Fabry-Perot resonances. Specifically, our experiments demonstrate that a strong resonance can be observed in the reflection spectrum of a 105 nm thick Rhodamine 6G-doped polyvinyl alcohol (PVA) coating on a silver surface under certain illumination conditions; this resonance shows an excellent spectral and temporal sensitivity to the change of environmental humidity. In addition, we also demonstrate the humidity sensing potential of a 47 nm thick titanium dioxide coating on an aluminium substrate as a more robust system for practical implementation.

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“…Therefore, there is a need of determining real-time personal exposure concentrations. Many works have reported qualitative and quantitative analyses of indoor and outdoor VOC concentrations [6,7,8]. Popular methods such as photo-ionization detection [9] and gas chromatography (GC)-mass spectrometry (MS) [10] have been developed.…”

Section: Introductionmentioning

confidence: 99%

A Novel Wireless Wearable Volatile Organic Compound (VOC) Monitoring Device with Disposable Sensors

Deng

Chen

Xian

et al. 2016

Sensors

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A novel portable wireless volatile organic compound (VOC) monitoring device with disposable sensors is presented. The device is miniaturized, light, easy-to-use, and cost-effective. Different field tests have been carried out to identify the operational, analytical, and functional performance of the device and its sensors. The device was compared to a commercial photo-ionization detector, gas chromatography-mass spectrometry, and carbon monoxide detector. In addition, environmental operational conditions, such as barometric change, temperature change and wind conditions were also tested to evaluate the device performance. The multiple comparisons and tests indicate that the proposed VOC device is adequate to characterize personal exposure in many real-world scenarios and is applicable for personal daily use.

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Detection of volatile organic compounds by an interferometric sensor

Cited by 24 publications

References 13 publications

The Effect of Adsorbed Volatile Organic Compounds on an Ultrathin Water Film Measurement

The Effect of Adsorbed Volatile Organic Compounds on an Ultrathin Water Film Measurement

Resonant absorption in dielectric thin films for humidity sensing

A Novel Wireless Wearable Volatile Organic Compound (VOC) Monitoring Device with Disposable Sensors

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