Fabricating optical fiber imaging sensors using inkjet printing technology: A pH sensor proof-of-concept

Carter, J. Chance; Alvis, Rosa Margarita; Brown, Steve B.; Langry, Kevin C.; Wilson, Thomas S.; McBride, Mary T.; Myrick, Michael L.; Cox, W. Royall; Grove, Michael E.; Colston, Bill W.

doi:10.1016/j.bios.2005.06.006

Cited by 58 publications

(28 citation statements)

References 20 publications

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“…In that respect, low-cost devices are highly needed to reduce a huge portion of cost for medical diagnosis and treatment. In order to develop a low cost device, a printing of functional material on a paper substrate has drawn great attention recently [3][4][5]. Admittedly, the device with the paper substrate answers to mankind's question for a low cost and abundant material.…”

Section: Introductionmentioning

confidence: 99%

Disposable paper-based electrochemical sensor utilizing inkjet-printed Polyaniline modified screen-printed carbon electrode for Ascorbic acid detection

Kit‐Anan

Olarnwanich

Sriprachuabwong

et al. 2012

Journal of Electroanalytical Chemistry

118

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Section: Introductionmentioning

confidence: 99%

Disposable paper-based electrochemical sensor utilizing inkjet-printed Polyaniline modified screen-printed carbon electrode for Ascorbic acid detection

Kit‐Anan

Olarnwanich

Sriprachuabwong

et al. 2012

Journal of Electroanalytical Chemistry

118

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“…By employing the most suitable optical detection method sensitivity issues can be addressed. Methods such as charge coupled devices [31], light wave multimeters [19], flat bed scanners [32][33][34] and photodiodes [35][36][37] have been explored previously. While functional, not all are suitable for the applications outlined earlier in terms of practicality, portability and scalability.…”

mentioning

confidence: 99%

A new light emitting diode–light emitting diode portable carbon dioxide gas sensor based on an interchangeable membrane system for industrial applications

Vargas-Sansalvador

Fay

Phelan

et al. 2011

Analytica Chimica Acta

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A new system for CO2 measurement (0-100%) by based on a paired emitter-detector diode arrangement as a colorimetric detection system is described. Two different configurations were tested: configuration 1 (an opposite side configuration) where a secondary inner-filter effect accounts for CO2 sensitivity. This configuration involves the absorption of the phosphorescence emitted from a CO2-insensitive luminophore by an acid-base indicator and configuration 2 wherein the membrane containing the luminophore is removed, simplifying the sensing membrane that now only contains the acid-base indicator. In addition, two different instrumental configurations have been studied, using a paired emitter-detector diode system, consisting of two LEDs wherein one is used as the light source (emitter) and the other is used in reverse bias mode as the light detector. The first configuration uses a green LED as emitter and a red LED as detector, whereas in the second case two identical red LEDs are used as emitter and detector. The system was characterised in terms of sensitivity, dynamic response, reproducibility, stability and temperature influence. We found that configuration 2 presented a better CO2 response in terms of sensitivity.Key words. Carbon dioxide sensor; Gas sensor; Optical sensor; Paired emitter detector-diode sensor; Portable instrumentation. INTRODUCTIONCO2 is an important industrial gas for many different uses that include production of chemicals (e.g. urea ), inert agent for food packaging (to extend the shelf-life of meat, cheese, etc.), beverages, refrigeration systems, welding systems, fire extinguishers, water treatment processes, and many other smaller scale applications [1;2]. In the agro-food industry CO2 is widely used in modified-atmosphere packaging where its task is to inhibit growth of spoilage bacteria [3;4]. For instance, in active packaging technologies a CO2 generating system can be considered as a technique complimentary to oxygen scavenging [5]. High CO2 levels (10-80 %) are desirable for foods such as meat and poultry in order to inhibit surface microbial growth and to extend their life time. The maintenance of CO2 concentration within packages in food [6], as instance using inserted sachets [7;8], must be carefully monitored since CO2 permeability is 3-5 times higher than that of oxygen for most of the plastic films and because CO2 is absorbed by many foods like meat and poultry. Real-time process monitoring is fundamental for effective process control. The rapid development of bioprocess applications together with the agro-food industry have led to an intensive search for new sensors capable of providing real-time information about the state of the processes. Conventional methods for CO2 determination include, among others, infrared spectrometry [9] or electrochemical sensors based on liquid (Severinghaus-type electrodes) or solid electrolytes [10;11]. The most popular sensors used for CO2 gas sensing in biotechnological applications are based on electrochemical measurements that can...

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“…Another common technique, electrohydrodynamic atomization and tip streaming, relies on the application of a high electric field for fluid dispersion. [10][11][12][13][14] Still, there is a wide range of techniques for production of discretely charged droplets for applications including mass spectrometry, [15][16][17][18][19][20][21] drop-on-demand manufacturing of multilayer parts and circuits, 22,23 spray coatings, 24,25 biosensing and other lab-on-a-chip applications, [26][27][28][29] and wet scrubber systems for pollution control, 30 among others. The focus of this work is on mechanically driven atomization, which is coupled to an external electric field for droplet charging.…”

Section: Introductionmentioning

confidence: 99%

Droplet charging regimes for ultrasonic atomization of a liquid electrolyte in an external electric field

2011

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Distinct regimes of droplet charging, determined by the dominant charge transport process, are identified for an ultrasonic droplet ejector using electrohydrodynamic computational simulations, a fundamental scale analysis, and experimental measurements. The regimes of droplet charging are determined by the relative magnitudes of the dimensionless Strouhal and electric Reynolds numbers, which are a function of the process ͑pressure forcing͒, advection, and charge relaxation time scales for charge transport. Optimal ͑net maximum͒ droplet charging has been identified to exist for conditions in which the electric Reynolds number is of the order of the inverse Strouhal number, i.e., the charge relaxation time is on the order of the pressure forcing ͑droplet formation͒ time scale. The conditions necessary for optimal droplet charging have been identified as a function of the dimensionless Debye number ͑i.e., liquid conductivity͒, external electric field ͑magnitude and duration͒, and atomization drive signal ͑frequency and amplitude͒. The specific regime of droplet charging also determines the functional relationship between droplet charge and charging electric field strength. The commonly expected linear relationship between droplet charge and external electric field strength is only found when either the inverse of the Strouhal number is less than the electric Reynolds number, i.e., the charge relaxation is slower than both the advection and external pressure forcing, or in the electrostatic limit, i.e., when charge relaxation is much faster than all other processes. The analysis provides a basic understanding of the dominant physics of droplet charging with implications to many important applications, such as electrospray mass spectrometry, ink jet printing, and drop-on-demand manufacturing.

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Fabricating optical fiber imaging sensors using inkjet printing technology: A pH sensor proof-of-concept

Cited by 58 publications

References 20 publications

Disposable paper-based electrochemical sensor utilizing inkjet-printed Polyaniline modified screen-printed carbon electrode for Ascorbic acid detection

Disposable paper-based electrochemical sensor utilizing inkjet-printed Polyaniline modified screen-printed carbon electrode for Ascorbic acid detection

A new light emitting diode–light emitting diode portable carbon dioxide gas sensor based on an interchangeable membrane system for industrial applications

Droplet charging regimes for ultrasonic atomization of a liquid electrolyte in an external electric field

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