Micro photoionization detectors

Rezende, Gustavo Coelho; Calvé, Stéphane Le; Brandner, Juergen J.; Newport, David

doi:10.1016/j.snb.2019.01.072

Cited by 39 publications

(25 citation statements)

References 28 publications

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“…Downscaling chemical and biological sensors result not only in ultra-portable devices, but in advantages such as enhanced process performance, higher analysis speed and reduced reagent consumption, significantly lowering fabrication, maintenance, and operational costs (Shakoor et al 2018). Some fields that benefit from these achievements are healthcare monitoring (Boppart and Richards-Kortum 2014; Wessels and Raad 2016;Zi et al 2016;Papageorgiou et al 2017;Sharma et al 2018), organ-on-a-chip (Zhang et al 2015;Si Hadj Mohand et al 2017;Kilic et al 2018), drug screening (Zhang et al 2015), food monitoring (Bhattacharya et al 2017), and environment monitoring (Ricciardi et al 2015a;Calvé et al 2017;Rezende et al 2019;Măriuța et al 2020). Potential applications are countless with a huge impact on the quality of life (Chen et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Miniaturization of fluorescence sensing in optofluidic devices

Măriuța

Colin

Barrot-Lattes

et al. 2020

Microfluid Nanofluid

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Successful development of a micro-total-analysis system (µTAS, lab-on-a-chip) is strictly related to the degree of miniaturization, integration, autonomy, sensitivity, selectivity, and repeatability of its detector. Fluorescence sensing is an optical detection method used for a large variety of biological and chemical assays, and its full integration within lab-on-a-chip devices remains a challenge. Important achievements were reported during the last few years, including improvements of previously reported methodologies, as well as new integration strategies. However, a universal paradigm remains elusive. This review considers achievements in the field of fluorescence sensing miniaturization, starting from off-chip approaches, representing miniaturized versions of their lab counter-parts, continuing gradually with strategies that aim to fully integrate fluorescence detection on-chip, and reporting the results around integration strategies based on optical-fiber-based designs, optical layer integrated designs, CMOS-based fluorescence sensing, and organic electronics. Further successful development in this field would enable the implementation of sensing networks in specific environments that, when coupled to Internet-of-Things (IoT) and artificial intelligence (AI), could provide real-time data collection and, therefore, revolutionize fields like health, environmental, and industrial sensing.

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Section: Introductionmentioning

confidence: 99%

Miniaturization of fluorescence sensing in optofluidic devices

Măriuța

Colin

Barrot-Lattes

et al. 2020

Microfluid Nanofluid

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“…Currently, there is a demand for portable gas analyzers to acquire analytical data in real-time with high sensitivity, low pure gas consumption (i.e., carrier gas), and low power consumption. Typical gas sensing techniques are electrochemical [7], semi-conductor [8], photo-ionization detection (PID) [9,10], piezoelectric [11,12] and optical technique [13,14,15,16]. Each technique has its advantages and limitations, as summarized in Table 1.…”

Section: Introductionmentioning

confidence: 99%

“…Optical gas sensors based on absorption have been shown to provide a sensitive and selective approach with minimal drift, rapid time response, and a low cross-response to other gases [9,14]. The measurement is self-referenced and reliable as the transduction is based on direct measurement of a molecule’s physical property (i.e., absorbance at a specific wavelength).…”

Section: Introductionmentioning

confidence: 99%

Gas Detection Using Portable Deep-UV Absorption Spectrophotometry: A Review

Khan

Newport

Calvé

2019

Sensors

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Several gas molecules of environmental and domestic significance exhibit a strong deep-UV absorption. Therefore, a sensitive and a selective gas detector based on this unique molecular property (i.e., absorption at a specific wavelength) can be developed using deep-UV absorption spectrophotometry. UV absorption spectrometry provides a highly sensitive, reliable, self-referenced, and selective approach for gas sensing. This review article addresses the recent progress in the application of deep-UV absorption for gas sensing owing to its inherent features and tremendous potentials. Applications, advancements, and challenges related to UV emission sources, gas cells, and UV photodetectors are assessed and compared. We present the relevant theoretical aspects and challenges associated with the development of portable sensitive spectrophotometer. Finally, the applications of UV absorption spectrometry for ozone, NO2, SO2, and aromatic organic compounds during the last decades are discussed and compared. A portable UV absorption spectrophotometer can be developed by using LEDs, hollow core waveguides (HCW), and UV photodetectors (i.e., photodiodes). LED provides a portable UV emission source with low power input, low-intensity drifts, low cost, and ease of alignment. It is a quasi-chromatic UV source and covers the absorption band of molecules without optical filters for absorbance measurement of a target analyte. HCWs can be applied as a miniature gas cell for guiding UV radiation for measurement of low gas concentrations. Photodiodes, on the other hand, offer a portable UV photodetector with excellent spectral selectivity with visible rejection, minimal dark current, linearity, and resistance against UV-aging.

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“…Among the existing detectors and techniques to detect VOCs [9], the photoionization detector (PID) is commonly used with a GC and it is suitable for miniaturization [10]. The PID uses ionization of gaseous compounds by light as a working principle to quantify chemicals in the gas samples.…”

Section: Introductionmentioning

confidence: 99%

Micro Milled Microfluidic Photoionization Detector for Volatile Organic Compounds

et al. 2019

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Government regulations and environmental conditions are pushing the development of improved miniaturized gas analyzers for volatile organic compounds. One of the many detectors used for gas analysis is the photoionization detector (PID). This paper presents the design and characterization of a microfluidic photoionization detector (or µPID) fabricated using micro milling and electrical discharge machining techniques. This device has no glue and facilitates easy replacement of components. Two materials and fabrication techniques are proposed to produce a layer on the electrodes to protect from ultraviolet (UV) light and possible signal noise generation. Three different microchannels are tested experimentally and their results are compared. The channel with highest electrode area (31.17 mm²) and higher volume (6.47 µL) produces the highest raw signal and the corresponding estimated detection limit is 0.6 ppm for toluene without any amplification unit.

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Micro photoionization detectors

Cited by 39 publications

References 28 publications

Miniaturization of fluorescence sensing in optofluidic devices

Miniaturization of fluorescence sensing in optofluidic devices

Gas Detection Using Portable Deep-UV Absorption Spectrophotometry: A Review

Micro Milled Microfluidic Photoionization Detector for Volatile Organic Compounds

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