Highly sensitive reflection based colorimetric gas sensor to detect CO in realistic fire scenarios

Pannek, Carolin; Vetter, Thomas W.; Oppmann, Maximilian; Weber, C.; Eberhardt, A.; Dold, Martin; Bauersfeld, Marie‐Luise; Henfling, Michael; Trupp, Sabine; Schug, Benedikt; Wöllenstein, Jürgen; Mandel, Karl

doi:10.1016/j.snb.2019.127572

Cited by 15 publications

(12 citation statements)

References 10 publications

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“…Colorimetric sensing can quantify target analytes by detecting color changes associated with chemical reactions between the analytes and the corresponding sensor materials [ 1 , 2 , 3 ], enabling in some cases a remarkable selectivity [ 4 , 5 , 6 ], low cost, and rapid response times [ 1 , 2 , 3 ]. A plethora of colorimetric sensors have been applied to detect environmental pollutants [ 7 , 8 ], toxic agents [ 9 , 10 , 11 ], biomarkers, and pharmaceutical- and food-relevant molecules [ 12 , 13 , 14 ]. Along this line, several reviews have been published [ 15 , 16 , 17 , 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Threshold-Responsive Colorimetric Sensing System for the Continuous Monitoring of Gases

Hota

et al. 2023

Sensors

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Colorimetric sensors are widely used because of their inherent advantages including accuracy, rapid response, ease-of-use, and low costs; however, they usually lack reusability, which precludes the continuous use of a single sensor. We have developed a threshold-responsive colorimetric system that enables repeated analyte measurements by a single colorimetric sensor. The threshold responsive algorithm automatically adjusts the sensor exposure time to the analyte and measurement frequency according to the sensor response. The system registers the colorimetric sensor signal change rate, prevents the colorimetric sensor from reaching saturation, and allows the sensor to fully regenerate before the next measurement is started. The system also addresses issues common to colorimetric sensors, including the response time and range of detection. We demonstrate the benefits and feasibility of this novel system, using colorimetric sensors for ammonia and carbon dioxide gases for continuous monitoring of up to (at least) 60 detection cycles without signs of analytical performance degradation of the sensors.

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Section: Introductionmentioning

confidence: 99%

Threshold-Responsive Colorimetric Sensing System for the Continuous Monitoring of Gases

Hota

et al. 2023

Sensors

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“…2,3 Besides nanoparticulate taggants, 4,5 which have their advantages and shortcomings, one promising alternative are specifically designed additives in the form of supraparticles 6 (i.e., nanostructured, micron-sized particles), which are equipped with information. 4,7−10 Such additives could contain information used for object identification or for an irreversible recording of external influences such as temperature, 11 moisture, 12,13 gases, 14,15 or mechanical stress 16,17 that may have affected the material previously.…”

Section: Introductionmentioning

confidence: 99%

“…Improved traceability of even the smallest subcomponents is only achieved when identifiers are linked with materials rather than being applied on macroscopically attached external labels. Macroscopic barcodes or radio frequency identifiers (RFIDs) thus have to be replaced by miniaturized taggants. , Besides nanoparticulate taggants, , which have their advantages and shortcomings, one promising alternative are specifically designed additives in the form of supraparticles (i.e., nanostructured, micron-sized particles), which are equipped with information. ,− Such additives could contain information used for object identification or for an irreversible recording of external influences such as temperature, moisture, , gases, , or mechanical stress , that may have affected the material previously.…”

Section: Introductionmentioning

confidence: 99%

Optically Sensitive and Magnetically Identifiable Supraparticles as Indicators of Surface Abrasion

et al. 2022

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Identifying and ensuring the integrity of products plays an important role in today's globalized world. Miniaturized information taggants in the packaging surface are therefore required to monitor the product itself instead of applying external labels. Ideally, multiple types of information are stored in such additives. In this work, micrometer-sized core−shell particles (supraparticles) were developed to provide material surfaces with both an identifier and a surface abrasion indication functionality. The core of the supraparticles contains iron oxide nanoparticles that allow identification of the surface with a spectral magnetic code resolved by magnetic particle spectroscopy. The fluorescent silica nanoparticles in the supraparticle shell can be abraded by mechanical stress and resolved by fluorescence spectroscopy. This provides information about the mechanical integrity of the system. The application as surfaces, that contain several types of information in one supraparticle, was demonstrated here by incorporating such bifunctional supraparticles as additives in a surface coating.

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“…Referring to the sensor-signal testing techniques, existing systems usually focus on the singular measurement of individual physical parameters, such as electrical properties [ 8 , 12 , 13 , 14 ], optical properties [ 15 , 16 , 17 , 18 , 19 ], thermal properties [ 20 ], surface acoustic waves (SAW) [ 21 ], and photoacoustic spectra (PAS) [ 22 ]. On the other hand, fewer systems are capable of the simultaneous measurement of multiple signals [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Vacuum Based Gas Sensing Material Characterization System for Precise and Simultaneous Measurement of Optical and Electrical Responses

Wei

Zhao

Wang

et al. 2022

Sensors

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Gas sensing performance characterization systems are essential for the research and development of gas sensing materials and devices. Although existing systems are almost completely automatically operated, the accuracies of gas concentration control and of pressure control and the ability to simultaneously detect different sensor signals still require improvement. In this study, a high-precision gas sensing material characterization system is developed based on vacuum technology, with the objective of enabling the precise and simultaneous measurement of electrical responses. Because of the implementation of vacuum technology, the gas concentration control accuracy is improved more than 1600 times, whereas the pressure of the test ambient condition can be precisely adjusted between vacuum and 1.2 bar. The vacuum-assisted gas-exchanging mechanism also enables the sensor response time to be determined more accurately. The system is capable of performing sensitivity, selectivity, and stability tests and can control the ambient relative humidity in a precise manner. More importantly, the levels of performance of three different optical signal measurement set-ups were investigated and compared in terms of detection range, linearity, noise, and response time, based on which of their scopes of application were proposed. Finally, single-period and cyclical tests were performed to examine the ability of the system to detect optical and electrical responses simultaneously, both at a single wavelength and in a spectral region.

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Highly sensitive reflection based colorimetric gas sensor to detect CO in realistic fire scenarios

Cited by 15 publications

References 10 publications

Threshold-Responsive Colorimetric Sensing System for the Continuous Monitoring of Gases

Threshold-Responsive Colorimetric Sensing System for the Continuous Monitoring of Gases

Optically Sensitive and Magnetically Identifiable Supraparticles as Indicators of Surface Abrasion

Vacuum Based Gas Sensing Material Characterization System for Precise and Simultaneous Measurement of Optical and Electrical Responses

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