Flexographically Printed Fluidic Structures in Paper

Olkkonen, Juuso; Lehtinen, Kaisa; Erho, Tomi

doi:10.1021/ac1027066

Cited by 323 publications

(210 citation statements)

References 18 publications

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“…These devices use hydrophobic barriers patterned on hydrophilic paper by photolithography, 7 by printing with PDMS 8 or dissolved polystyrene, 9 or by solid wax applied by a commercial printer 10,11 to create microfluidic channels that guide the transport of fluids into discreet test zones. It is also possible to extend the topology of the microfluidic channels into the third dimension by stacking 12 analyze the image and transmit the results back to the user by text message.…”

Section: Micro-paper-based Analytical Devices (µPads)mentioning

confidence: 99%

Paper-based electroanalytical devices for accessible diagnostic testing

Maxwell

Mazzeo

Whitesides³

2013

MRS Bull.

186

126

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Section: Micro-paper-based Analytical Devices (µPads)mentioning

confidence: 99%

Paper-based electroanalytical devices for accessible diagnostic testing

Maxwell

Mazzeo

Whitesides³

2013

MRS Bull.

186

126

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“…1,2 Recent developments incorporate hydrophobic barriers, 3,4 microfluidic channels 5 and stacking layers for sensing purposes. 6 Among other characteristics, paper is a low cost material, readily available, and is also flexible.…”

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confidence: 99%

A Paper-Based Electrochemical Sensor Using Inkjet-Printed Carbon Nanotube Electrodes

Costa

Song

Tortorich

et al. 2015

ECS J. Solid State Sci. Technol.

107

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This paper presents a fully inkjet-printed electrochemical sensor on paper which consists of carbon nanotube-printed working, reference, and counter electrodes. The proposed technique aims at low-cost and disposable paper-based electrochemical sensors. First, a carbon nanotube (CNT) ink was inkjet-printed directly on paper, forming a conductive network. Additionally, a hydrophobic barrier was patterned on paper to limit the absorption of liquid to the designed area. The inkjet printing method allows for rapid patterning of electrodes on paper, resulting in a simple and effective electrochemical sensor. The sheet resistance of the CNT-printed paper was as low as 1 k / after 33 prints. A potential step voltammetry method was applied to determine the concentration of the analytes, iron ion (Fe 2+ ) and dopamine (DA), with linear ranges of 10 μM-200 μM and 10 μM-100 μM, respectively. The reported approach for a fully inkjet-printed electrochemical sensor is easy and cheap, and it has a potential for simple and rapid paper-based point-of-care diagnostics. Paper-based chemical and biological sensors have become attractive in recent years due to their facile fabrication, simplicity of use, and the ability of paper to easily absorb and retain liquid.1,2 Recent developments incorporate hydrophobic barriers, 3,4 microfluidic channels 5 and stacking layers for sensing purposes. 6 Among other characteristics, paper is a low cost material, readily available, and is also flexible.In order to develop a paper-based sensor, various materials must be patterned on paper for sensing purposes.7 Therefore a quick and easy method to pattern such materials is the subject of great interest. In connection with printed electronics technology, various printing methods exist for patterning conductive materials on thin substrates. 8Among them, inkjet printing has much interest due to many advantages such as automated printing process, mass producibility, and uniform deposition of materials.9 Here, we are interested in utilizing the inkjet printing technology for the development of a paper-based electrochemical sensor.Printing methods have been applied for chemical sensors in a number of ways; however, since further steps were required in order to build a complete device, it is desirable to develop a simpler printing process. For example, inkjet printing was used to print dissolvable materials in order to pattern hydrophobic areas, 10 where it was necessary to dip coat the paper and clean the dissolved material afterwards. In another instance, inkjet printing of metal nanoparticles was performed with an additional sintering step.11 Thus, a simpler one step process to develop a paper-based sensing device is necessary which should be easy and cheap to fabricate.Although paper based analytical devices have been greatly advanced, a simple method of fabrication coupled with reliable detection method is still needed. Our approach targets the fabrication issue by integrating all the fabrication steps into a single method of inkjet printing. This can...

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“…width and length) of the device. The conventional methods used for creating hydrophobic barriers are inkjet printing [17][18][19], wax printing [20,21], flexographic printing [22], photolithography [23], wax dipping [24], plasma treatment [19,25], screenprinting of poly(dimethylsiloxane) (PDMS) [15], lacquer spraying [26] and using a permanent marker [27]. The details of these fabrication methods have been studied comprehensively by several researchers [11,28,29].…”

Section: Fabrication Techniquesmentioning

confidence: 99%