Graphite on paper as material for sensitive thermoresistive sensors

Dinh, Toan; Phan, Hoang‐Phuong; Dao, Dzung Viet; Woodfield, Peter; Qamar, Afzaal; Nguyen, Nam‐Trung

doi:10.1039/c5tc01650a

Cited by 107 publications

(69 citation statements)

References 31 publications

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“…This can be attributed to the comparability of ionic and electronic polarizabilities of the substrate whose dielectric constant lies in the range of 2.5 to 10 (dielectric constant of paper ∼3 to 4) . In contrast, the graphitic resistive sensors exhibit high sensitivity to temperature . Therefore the graphite on paper capacitive sensor will exhibit stable response in comparison with resistive sensor despite the variation in surrounding temperature.…”

Section: Figuresupporting

confidence: 83%

Pencil‐drawn Paper‐based Non‐invasive and Wearable Capacitive Respiration Sensor

Kanaparthi

2017

Electroanalysis

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This paper describes a fully‐drawn pencil‐on‐paper based low‐cost capacitive sensor for non‐invasive respiration monitoring. The sensor utilizes the hygroscopic character of the paper to measure the breathing rate and pattern. The adsorption and desorption of water molecules on paper during inhalation and exhalation results in variation in its dielectric constant. This change in dielectric constant during respiration reflects the change in capacitance of the sensor. By interfacing the sensor with the microcontroller, the capacitance data was acquired and transferred to a smartphone through Bluetooth communication. Being a low cost, wearable, non‐invasive and disposable sensor, it holds tremendous potential in healthcare technology and can be commercialized into a viable product for easy‐to‐use diagnostic purpose.

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Section: Figuresupporting

confidence: 83%

Pencil‐drawn Paper‐based Non‐invasive and Wearable Capacitive Respiration Sensor

Kanaparthi

2017

Electroanalysis

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“…It is assumed that free carriers are trapped in the boundaries between graphite grains, creating a potential barrier which hinders the motion of carriers between graphite grains. Since the resistance of graphite grains is far smaller than that of the boundaries [17], the resistance of the graphite resistor can be approximated as boundary resistance, which is described as follows [18]: Journal of Sensors where k is the Boltzmann constant, φ is the potential barrier which impedes the motion of carriers between graphite grains, and T is the temperature. It is indicated that the application of the chemical substance increased the potential barrier.…”

Section: Resultsmentioning

confidence: 99%

Pencil-on-Paper Sensor for Water Detection

Zhu

Xia

et al. 2018

Journal of Sensors

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This paper sets out a simple and affordable method for the manufacture of a water sensor involving drawing marks on paper using a flexible pencil. The sensor indicates flexible endurance variations upon exposure to water or a drying surface. It can be employed for the detection of water substances in ethanol. In addition, an experiment suggests the usefulness of the sensor for the sensing of breath. This shows the immense potential applications of the sensor for wearable and also health-inspecting electronic gadgetry.

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“…For instance, the penciling direction is horizontal in the first cycle, vertical in the second cycle, and horizontal again in the third cycle . Employing such approach, SCs, humidity sensors, microfluidic devices, and anemometers have been demonstrated, in which pencil traces mainly acted as passive conductive elements. As is widely known, the dominating fillers in commercial pencils are graphite and clay, and the conductivity of the drawing trace is determined by the graphite content.…”

Section: Approaches To Boost Functionsmentioning

confidence: 99%

Flexible Electronics Based on Micro/Nanostructured Paper

et al. 2018

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Over the past several years, a new surge of interest in paper electronics has arisen due to the numerous merits of simple micro/nanostructured substrates. Herein, the latest advances and principal issues in the design and fabrication of paper-based flexible electronics are highlighted. Following an introduction of the fascinating properties of paper matrixes, the construction of paper substrates from diverse functional materials for flexible electronics and their underlying principles are described. Then, notable progress related to the development of versatile electronic devices is discussed. Finally, future opportunities and the remaining challenges are examined. It is envisioned that more design concepts, working principles, and advanced papermaking techniques will be developed in the near future for the advanced functionalization of paper, paving the way for the mass production and commercial applications of flexible paper-based electronic devices.

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Graphite on paper as material for sensitive thermoresistive sensors

Abstract: We report on the thermoresistive properties of graphite on paper (GOP). A large temperature coefficient of resistance was observed and a highly sensitive GOP-based anemometer was demonstrated, indicating strong feasibility of using the GOP for low-cost thermoresistive sensors.

Cited by 107 publications

References 31 publications

Pencil‐drawn Paper‐based Non‐invasive and Wearable Capacitive Respiration Sensor

Pencil‐drawn Paper‐based Non‐invasive and Wearable Capacitive Respiration Sensor

Pencil-on-Paper Sensor for Water Detection

Flexible Electronics Based on Micro/Nanostructured Paper

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