scholarly journals Wireless and mobile optical chemical sensors and biosensors

2018 ◽  
Vol 37 (4) ◽  
Author(s):  
Petar Kassal ◽  
Ema Horak ◽  
Marija Sigurnjak ◽  
Matthew D. Steinberg ◽  
Ivana Murković Steinberg
Keyword(s):  
Optical Sensors ◽  
Chemical Sensors ◽  
Chemical Sensor ◽  
Current Trend ◽  
Original Research ◽  
Sensor Systems ◽  
Optical Chemical Sensor ◽  
Trade Offs ◽  
Optical Chemical Sensors ◽  
Personal Fitness

Abstract This review explores the current state-of-the-art wireless and mobile optical chemical sensors and biosensors. The review is organised into three sections, each of which investigates a major class of wireless and/or mobile optical chemical sensor: (i) optical sensors integrated with a radio transmitter/transceiver, (ii) wearable optical sensors, and (iii) smartphone camera-based sensors. In each section, the specific challenges and trade-offs surrounding the (bio)chemical sensing mechanism and material architecture, miniaturisation, integration, power requirements, readout, and sensitivity are explored with detailed examples of sensor systems from the literature. The analysis of 77 original research articles published between 2007 and 2017 reveals that healthcare and medicine, environmental monitoring, food quality, and sport and fitness are the target markets for wireless and mobile optical chemical sensor systems. In particular, the current trend for personal fitness tracking is driving research into novel colourimetric wearable sensors with smartphone readout. We conclude that despite the challenges, mobile and wearable optical chemical sensor systems are set to play a major role in the sensor Internet of Things.

scholarly journals Sensing Heavy Metals Using Mesoporous-Based Optical Chemical Sensors

2013 ◽  
Vol 2013 ◽  
pp. 1-13 ◽  
Author(s):  
Špela Korent Urek ◽  
Nina Frančič ◽  
Matejka Turel ◽  
Aleksandra Lobnik
Keyword(s):  
Heavy Metal ◽  
Mesoporous Materials ◽  
Optical Sensors ◽  
Chemical Sensors ◽  
Chemical Sensor ◽  
Limit Of Detection ◽  
Good Alternative ◽  
High Porosity ◽  
Optical Chemical Sensors ◽  
Materials Used

Heavy metal pollution is one of the more serious environmental problems; therefore, there is a constant demand for the development of new analytical tools for its monitoring. An optical chemical sensor represents a good alternative to classical instrumental methods. The mesoporous materials used in optical chemical sensors’ fabrications have properties such as high porosity, exceptional adsorption capacity, tuneable 3D shape, geometry, and morphology, which enable improved limit of detection, response time, and selectivity properties of optical sensors. In this review, we firstly present the properties of mesoporous materials, provide a brief description of sensing mechanisms, and briefly discuss the importance of continuous monitoring. Recent advances in those mesoporous silica-based optical sensors used for heavy metal detection have been reported and their advantages and limitations also discussed. This review covers publications that have appeared since 2008.

scholarly journals Integration and application of optical chemical sensors in microbioreactors

Lab on a Chip ◽  
2017 ◽  
Vol 17 (16) ◽  
pp. 2693-2712 ◽  
Author(s):  
Pia Gruber ◽  
Marco P. C. Marques ◽  
Nicolas Szita ◽  
Torsten Mayr
Keyword(s):  
Carbon Dioxide ◽  
Chemical Sensors ◽  
Chemical Sensor ◽  
Optical Chemical Sensor ◽  
Optical Chemical Sensors

This tutorial review explains the integration of optical chemical sensor formats for the purpose of monitoring oxygen, pH, carbon dioxide, glucose and temperature in microbioreactors.

scholarly journals Commercial Polycarbonate Track-Etched Membranes as Optical Chemical Sensors

Proceedings ◽  
2018 ◽  
Vol 4 (1) ◽  
pp. 27
Author(s):  
Paula Martínez-Pérez ◽  
Jaime García-Rupérez
Keyword(s):  
Refractive Index ◽  
Porous Materials ◽  
Optical Sensors ◽  
Chemical Sensors ◽  
Main Parameter ◽  
Refractive Index Sensing ◽  
Photonic Structures ◽  
New Material ◽  
Optical Chemical Sensors

Refractive index is the main parameter measured by current optical sensors. Among all the photonic structures available for their design, porous materials have become an excellent option, since they provide better sensitivities. In our work, commercially available polycarbonate track-etched membranes were used as porous photonic structures. By means of reflectivity measurements, we demonstrated their capability to detect the presence of ethanol in the medium and showed the possibility of reusing them in several sensing assays. This new material could become an easier-to-obtain and cheaper alternative to current porous materials commonly used in optical sensors for refractive index sensing.

Comparison of two devices for measuring exercise transcutaneous oxygen pressures in patients with claudication

VASA ◽  
2015 ◽  
Vol 44 (5) ◽  
pp. 355-362 ◽  
Author(s):  
Marie Urban ◽  
Alban Fouasson-Chailloux ◽  
Isabelle Signolet ◽  
Christophe Colas Ribas ◽  
Mathieu Feuilloy ◽  
...  
Keyword(s):  
Oxygen Pressure ◽  
Optical Sensors ◽  
Chemical Sensors ◽  
Transcutaneous Oxygen ◽  
Starting Values ◽  
Two Systems ◽  
Transcutaneous Oxygen Pressure ◽  
New Sensors ◽  
Changes Over Time ◽  
Over Time

Abstract. Summary: Background: We aimed at estimating the agreement between the Medicap® (photo-optical) and Radiometer® (electro-chemical) sensors during exercise transcutaneous oxygen pressure (tcpO2) tests. Our hypothesis was that although absolute starting values (tcpO2rest: mean over 2 minutes) might be different, tcpO2-changes over time and the minimal value of the decrease from rest of oxygen pressure (DROPmin) results at exercise shall be concordant between the two systems. Patients and methods: Forty seven patients with arterial claudication (65 + / - 7 years) performed a treadmill test with 5 probes each of the electro-chemical and photo-optical devices simultaneously, one of each system on the chest, on each buttock and on each calf. Results: Seventeen Medicap® probes disconnected during the tests. tcpO2rest and DROPmin values were higher with Medicap® than with Radiometer®, by 13.7 + / - 17.1 mm Hg and 3.4 + / - 11.7 mm Hg, respectively. Despite the differences in absolute starting values, changes over time were similar between the two systems. The concordance between the two systems was approximately 70 % for classification of test results from DROPmin. Conclusions: Photo-optical sensors are promising alternatives to electro-chemical sensors for exercise oximetry, provided that miniaturisation and weight reduction of the new sensors are possible.

Porous silicon microcavities as optical chemical sensors

2000 ◽  
Vol 76 (18) ◽  
pp. 2523-2525 ◽  
Author(s):  
V. Mulloni ◽  
L. Pavesi
Keyword(s):  
Porous Silicon ◽  
Chemical Sensors ◽  
Optical Chemical Sensors
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