A low-cost miniaturized colorimetric sensor with vertically-stacked semi-transparent finger-type organic photo detector for formaldehyde sensing

Lin, Ching Fu; Zan, Hsiao Wen; Lu, Chia Jung; Meng, Hsin Fei; Soppera, Olivier

doi:10.1016/j.orgel.2019.05.037

Cited by 15 publications

(2 citation statements)

References 25 publications

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“…Nevertheless, such instrument is commonly coming with expensive cost which limits its usage. The need to have a low cost system is thus needed for general purpose measurement activities to verify and monitor the surrounding setting, particularly for pH related application [24].…”

Section: Introductionmentioning

confidence: 99%

Development of an optical pH measurement system based on colorimetric effect

Mustafa

Azam

Sulaiman

et al. 2021

IJEECS

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<p>This paper proposed an optical pH measurement system developed to measure the changes of pH levels based on colorimetric reactions with phenol red reagent. The optical sensing was achieved through the implementation of a pair of light emitting diode (LED) and photodiode. The detection mechanism was based on different absorbance of light intensity at pH values of 2.36, 8.32, 9.08 and 12.83. The data processing method was carried out using LabVIEW software and interfaced with NI USB DAQ 6008. The measured voltage showed a good correlation in relation to the pH level with R2 equals to 0.9624. This relationship was used as a calibration curve in the final system testing. The final measurement of pH showed a good agreement between the actual and measured values with an error of less than 5%, thus indicating the reliability of the proposed system.</p>

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Section: Introductionmentioning

confidence: 99%

Development of an optical pH measurement system based on colorimetric effect

Mustafa

Azam

Sulaiman

et al. 2021

IJEECS

View full text Add to dashboard Cite

show abstract

“…While low-cost sensors are available for speciated hydrocarbons such as formaldehyde (HCHO), several weaknesses have prevented them from becoming more widely used. As many hydrocarbon-specific sensors have been developed for indoor use [14][15][16][17], years of research and trial and error will be required to determine which-if any-are suitable for long-term ambient monitoring in outdoor environments. Using a formaldehyde-specific sensor also closes the door to studying other types of hydrocarbons.…”

Section: Introduction 1the Need For Low-cost Speciated Hydrocarbon Datamentioning

confidence: 99%

Applications and Limitations of Quantifying Speciated and Source-Apportioned VOCs with Metal Oxide Sensors

Okorn

Hannigan

2021

Atmosphere

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While low-cost air quality sensor quantification has improved tremendously in recent years, speciated hydrocarbons have received little attention beyond total lumped volatile organic compounds (VOCs) or total non-methane hydrocarbons (TNMHCs). In this work, we attempt to use two broad response metal oxide VOC sensors to quantify a host of speciated hydrocarbons as well as smaller groups of hydrocarbons thought to be emanating from the same source or sources. For sensors deployed near oil and gas facilities, we utilize artificial neural networks (ANNs) to calibrate our low-cost sensor signals to regulatory-grade measurements of benzene, toluene, and formaldehyde. We also use positive matrix factorization (PMF) to group these hydrocarbons along with others by source, such as wet and dry components of oil and gas operations. The two locations studied here had different sets of reference hydrocarbon species measurements available, helping us determine which specific hydrocarbons and VOC mixtures are best suited for this approach. Calibration fits on the upper end reach above R2 values of 0.6 despite the parts per billion (ppb) concentration ranges of each, which are magnitudes below the manufacturer’s prescribed detection limits for the sensors. The sensors generally captured the baseline trends in the data, but failed to quantitatively estimate larger spikes that occurred intermittently. While compounds with high variability were not suited for this method, its success with several of the compounds studied represents a crucial first step in low-cost VOC speciation. This work has important implications in improving our understanding of the links between health and environment, as different hydrocarbons will have varied consequences in the human body and atmosphere.

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Recent Progress in Nanomaterial Enabled Chemical Sensors for Wearable Environmental Monitoring Applications

Mamun

Yuce

2020

Adv Funct Materials

102

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In the present era of the Internet of Things, wearable sensors have been receiving considerable attention owing to their great potential in a plethora of applications. Highly sensitive chemical type wearable sensors that can conformably adhere to the epidermis or textiles for monitoring personal microenvironment have gained incredible interest. Attributable to the large surface area and excellent mechanical, chemical, physical, thermal as well as biocompatible properties, nanomaterials have become a prominent building block to develop wearable sensors. In this review, recent progress in the development of nanomaterial enabled wearable chemical environmental sensors (WCESs) is presented by focusing on the chemistry‐based transduction principles. The developments in sensor structures, selection of materials, and fabrication methods are highlighted. The recent WCESs are summarized by grouping in three major types according to their transduction principles: electrical, photochemical, and electrochemical. In addition, sensors with multimodal sensing capability as well as sensors immobilized in wireless tags are summarized. Finally, issues, challenges, and future perspectives are discussed to develop next‐generation WCESs with long life, biocompatibility, self‐healing, and real‐time communication capabilities.

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A low-cost miniaturized colorimetric sensor with vertically-stacked semi-transparent finger-type organic photo detector for formaldehyde sensing

Cited by 15 publications

References 25 publications

Development of an optical pH measurement system based on colorimetric effect

Development of an optical pH measurement system based on colorimetric effect

Applications and Limitations of Quantifying Speciated and Source-Apportioned VOCs with Metal Oxide Sensors

Recent Progress in Nanomaterial Enabled Chemical Sensors for Wearable Environmental Monitoring Applications

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