Journal: Sensors and Actuators B: Chemical

Abbreviation

Publisher

Elsevier

Journal Volumes

ISSN

0925-4005

Description

Filters

Reset filters

Search Results

Publications 1 - 10 of 89
  • Carbon dots and fluorescein: The ideal FRET pair for the fabrication of a precise and fully reversible ammonia sensor
    Item type: Journal Article
    Hsu, C.P.; Hejazi, Z.; Armagan, E.; et al. (2017)
    Sensors and Actuators B: Chemical
  • A novel compact intrinsic safety full range Methane microprobe sensor using “trans-world” processing method based on near-infrared spectroscopy
    Item type: Journal Article
    Zhang, Lewen; Pang, Tao; Zhang, Zhirong; et al. (2021)
    Sensors and Actuators B: Chemical
    A novel compact intrinsic safety full range methane (CH4) microprobe sensor based on spectroscopy techniques is proposed for leaking detection in explosion risk environment, such as: nature gas industries, petro-chemical enterprise and coal mines. The developed detection method combines the benefits of calibration-free direct absorption spectroscopy (CF-DAS) and the high sensitivity wavelength modulation spectroscopy (WMS). And the “trans-world” method results are switched according to the selected variation point of the detection concentration, thereby ensuring the possibility of high accuracy of full-range detection. The physical dimension of the sensor is minimized into 4.7 cm (length) and 3.5 cm (diameter), that benefit of the highly integrated circuit board and compact optical design. After proportional integral differential (PID) modulation, the temperature fluctuation range of laser can be limited within -0.02 ∼ +0.02 ℃. The relative detection error is -1.5 %∼0.53 % within the full detection range. And the continuous detection analysis indicates that measurement precision of 89 ppm for CH4. Through the signal-to-noise ratio (SNR) analysis, the minimum detection limit can be obtained as 6.48 ppm m (1σ). Meanwhile, the measurement response time of the microprobe is about 8 s. Compared with other reported results, this probe sensor reveals the further improvement of the probe structures, detectable range and column density. © 2021 Elsevier
  • Dynamic Calibration of QMB Polymer-Coated Sensors by Wiener Kernel Estimation
    Item type: Conference Paper
    Davide, Fabrizio A.M.; Di Natale, Corrado; D'Amico, Arnaldo; et al. (1995)
    Sensors and Actuators B: Chemical
  • Multi-component gas measurement aliasing spectral demodulation method for interference separation in laser absorption spectroscopy
    Item type: Journal Article
    Qianjin, Wang; Sun, Pengshuai; Zhang, Zhirong; et al. (2022)
    Sensors and Actuators B: Chemical
    The interference between overlapping gas absorption lines often occurs in the measurement of multi-component gas mixture with using laser absorption spectroscopy. It has become a “bottleneck” problem in many application areas. Therefore, in this paper, we take the measurement of CH4 and CO gas mixture as an example to develop a dual-gas sensor using tunable diode laser absorption spectroscopy with a novel multi-component gas measurement aliasing spectral demodulation method for interference separation. With the assistance of the above methods, the concentrations of CO and CH4 are inverted by analyzing the severely aliased second harmonic signal (2f) in the coexistence of trace CO and CH4 with high concentration. Experiments have verified that precise measurement results can be obtained, whether it is to measure individual CO or CH4, or to measure the gas mixture. Even in the presence of 1.6 × 104 ppm CH4, the measurement error of 10 ppm CO is no more than 0.9 ppm. And, the response time of this sensor for CO and CH4 detection are both ~17 s. Finally, the repeatability of this sensor is validated by continuous detection analysis, which indicates that measurement precision is 0.10 ppm for 20 ppm CO and 1.02 ppm for 200 ppm CH4, respectively. Therefore, this novel processing method avoids the shortage of low-pressure control without adding any hardware, which is more universal and convenient.
  • Artificial bacterial flagella functionalized with temperature-sensitive liposomes for controlled release
    Item type: Journal Article
    Qiu, Famin; Mhanna, Rami; Zhang, Li; et al. (2014)
    Sensors and Actuators B: Chemical
  • A composed neural net for the recognition of gas mixtures
    Item type: Conference Paper
    Di Natale, Corrado; Davide, Fabrizio A.M.; D'Amico, Arnaldo; et al. (1995)
    Sensors and Actuators B: Chemical
  • A portable and smartphone-based plasmonic system for on-site measurement of airborne redox-active compounds by light-initiated redox reaction
    Item type: Journal Article
    Yu, Ranxue; Qiu, Guangyu; Zhao, Yi-Bo; et al. (2022)
    Sensors and Actuators B: Chemical
    The determination of airborne redox-active compounds (ARC) is essential for monitoring adverse environmental changes and understanding the potential impact on human health. With the exception of relying on the common total organic carbon (TOC) analyzer and dithiothreitol (DTT) assay, there is currently no easy-to-use method for quantitative assessment. Herein, a compatible and easy-to-use colorimetric sensing strategy was developed for on-site ARC quantification. This approach integrated a plasmonic sensing system, where the ARC-induced gold nanoparticles (AuNPs) reduction, localized surface plasmon resonance (LSPR), and the light-mediated photochemistry collaborated to achieve a limit of detection (LOD) at 0.026 μg∙mm-2 on the filters. Distinguished from the abovementioned methods, the ARC content can be directly determined by in-situ monitoring the colorimetric reaction on the sampling quartz filters (QF) without additional sample pre-treatment. Apart from utilizing the standard benchtop photodetector (e.g., UV-VIS spectrophotometer), the colorimetric images of AuNP@QF samples could also be imaged by a smartphone camera in a sealed box and analyzed through a smartphone-based application to read the RGB (Red, Green, Blue) values for ARC quantification. The good correlation between the results using the spectrophotometer and smartphone validate the applicability of the AuNP sensor. The smartphone-based method was then deployed to test real-world aerosols collected from Zurich, Bern and Rigi and the results of ARC exhibited a positive correlation with that of PM10. With the advantages of low-cost, easy-operation and no need for pre-treatment, this smartphone-based plasmonic system holds great potential for rapid and portable ARC detection and corresponding air quality assessment.
  • Application of neural-network systems to the dynamic response of polymer-based sensor arrays
    Item type: Conference Paper
    Schweizer-Berberich, Markus; Göppert, Josef; Hierlemann, Andreas; et al. (1995)
    Sensors and Actuators B: Chemical
  • Highly selective surface acoustic wave e-nose implemented by laser direct writing
    Item type: Journal Article
    Benetti, Massimiliano; Cannatà, Domenico; Verona, Enrico; et al. (2019)
    Sensors and Actuators B: Chemical
  • Colorimetric immunodetection of bacteria enriched on membranes within a compact multichannel filtration device
    Item type: Journal Article
    Tang, Jiukai; Meng, Yingchao; Bezinge, Léonard; et al. (2022)
    Sensors and Actuators B: Chemical
    Colorimetric immunoassay is a widely used method for pathogen detection. The conventional implementation of immunoassays in 96-well plates often encounters difficulties for samples with low concentrations. In this study, the detection performance has been improved using a cellulose acetate membrane for target enrichment and immunodetection. For this end, a compact multichannel filtration device was fabricated using a 3D printer for sample loading. Background effects of the membrane were greatly minimized after pretreatment with a sodium hydroxide solution to significantly reduce non-specific binding. The colorimetric result of the immunodetection of Escherichia coli strain K12 (E.coli K12) was recorded and quantitatively analyzed with a smartphone camera. A limit of detection was calculated as 40 cfu (colony forming unit)/ml, two orders of magnitude more sensitive than that obtained on 96-well plates with standard protocol. The developed approach features an integrated sample enrichment scheme, reduced reagents consumption, multiple channels for parallel processing and no reliance on advanced laboratory instruments, thereby providing potential for a low-cost and easy-to-use immunodetection system.
Publications 1 - 10 of 89