Low-cost, solution processable carbon nanotube supercapacitors and their characterization

Lehtimäki, Suvi; Tuukkanen, Sampo; Pörhönen, Juho; Moilanen, Pasi; Virtanen, Jorma; Honkanen, Mari; Lupo, Donald

doi:10.1007/s00339-014-8547-4

Cited by 35 publications

(27 citation statements)

References 28 publications

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“…Apart from the mesh-induced pattern, the surface of the film is fairly smooth and the fibrous structure is randomly oriented. The density of the CNF film was found to be 1.38 g/cm 3 which is similar to other reports 18 . In comparison, the densities of the PVDF 29 and EMFi 36 sensor materials are 1.78 g/cm 3 and 0.33 g/cm 3 , respectively.…”

Section: Piezoelectric Sensitivity Of Cnf Filmssupporting

confidence: 90%

“…The density of the CNF film was found to be 1.38 g/cm 3 which is similar to other reports 18 . In comparison, the densities of the PVDF 29 and EMFi 36 sensor materials are 1.78 g/cm 3 and 0.33 g/cm 3 , respectively. Since the CNF film has a porous structure, it is reasonable that CNF film density is slightly lower that of the PVDF film.…”

Section: Piezoelectric Sensitivity Of Cnf Filmssupporting

confidence: 90%

“…No traces of defects were found. The density of the CNF film was estimated to be 1.38 g/cm 3 , based on measurement of film dimensions and weight measured in ambient air.…”

Section: Cnf Film Characterizationmentioning

confidence: 99%

“…Processing in aqueous media ensures low cost and high throughput manufacturing of functional devices for electronics 2,3 , sensing 4 and optics 5 . Furthermore, the combination of nanocelluloses with water-processable carbon-based nanomaterials, such as carbon nanotubes or graphene, is beneficial towards flexible and disposable devices, including supercapacitors 6-8 among many others.…”

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confidence: 99%

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Cellulose Nanofibril Film as a Piezoelectric Sensor Material

Rajala

Siponkoski

Sarlin

et al. 2016

ACS Appl. Mater. Interfaces

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Self-standing films (45-μm thick) of native cellulose nanofibrils (CNF) were synthesized and characterized for their piezoelectric response. The surface and the microstructure of the films were evaluated with image-based analysis and scanning electron microscopy (SEM). The measured dielectric properties of the films at 1 kHz and 9.97 GHz indicated a relative permittivity of 3.47 and 3.38 and loss tangent tan  of 0.011 and 0.071, respectively. The films were used as functional sensing layers in piezoelectric sensors with corresponding sensitivities of 4.7 to 6.4 pC/N in ambient conditions. This piezoelectric response is expected to increase remarkably upon film polarization resulting from the alignment of the cellulose crystalline regions in the film. The CNF sensor characteristics were compared with those of polyvinylidene fluoride (PVDF) as reference piezoelectric polymer. Overall, the results suggest that CNF is a suitable precursor material for disposable piezoelectric sensors, actuator or energy generators with potential applications in the fields of electronics, sensors and biomedical diagnostics.

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Section: Piezoelectric Sensitivity Of Cnf Filmssupporting

confidence: 90%

Section: Piezoelectric Sensitivity Of Cnf Filmssupporting

confidence: 90%

“…No traces of defects were found. The density of the CNF film was estimated to be 1.38 g/cm 3 , based on measurement of film dimensions and weight measured in ambient air.…”

Section: Cnf Film Characterizationmentioning

confidence: 99%

mentioning

confidence: 99%

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Cellulose Nanofibril Film as a Piezoelectric Sensor Material

Rajala

Siponkoski

Sarlin

et al. 2016

ACS Appl. Mater. Interfaces

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261

178

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“…In addition, the combination of printing technologies with disposable, non-toxic organic molecular materials offers a route towards green electronics [15]. The nanostructural carbon materials and their composites with polymers are promising solution-processable materials, e.g., for supercapacitor electrodes [16,17].…”

Section: Introductionmentioning

confidence: 99%

Measuring optical anisotropy in poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) films with added graphene

Isoniemi

Tuukkanen

Cameron³

et al. 2015

Organic Electronics

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Measuring optical anisotropy in poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) films with added graphene Isoniemi, Tommi; Tuukkanen, Sampo; Cameron, David C.; Simonen, Janne; Toppari, Jussi Isoniemi, T., Tuukkanen, S., Cameron, D. C., Simonen, J., & Toppari, J. (2015). Measuring optical anisotropy in poly (3,4-ethylene AbstractGraphene is a 2D nanomaterial having a great potential for applications in electronics and optoelectronics. Composites of graphene with conducting polymers have shown high performance in practical devices and their solution-processability enables low-cost and high-throughput mass manufacturing using printing techniques. Here we measure the effect of incorporation of graphene into poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) to the optical anisotropy, absorbance and conductivity of the film. Uniaxial anisotropy in PEDOT:PSS films has been thought to be caused by the spin-coating process used in fabrication. We have characterized spray-and spincoated films using ellipsometry and total internal reflection spectroscopy, the latter especially for films too thick and uneven for ellipsometry, and show that spray-coating, similar to inkjet printing, also produces consistently anisotropic properties even in very thick and uneven films. Possible plasmonic excitations related to graphene are not seen in the films. The optical and electrical anisotropy of graphene/PEDOT:PSS enables routes to high performance devices for electronics, photonics and optoelectronics.

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Printable, Transparent, and Flexible Touch Panels Working in Sunlight and Moist Environments

Vuorinen

Zakrzewski

Rajala

et al. 2014

Adv Funct Materials

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The ongoing revolution of touch‐based user interfaces sets new requirements for touch panel technologies, including the need to operate in a wide range of environments. Such touch panels need to endure moisture and sunlight. Moreover, they often need to be curved or flexible. Thus, there is a need for new technologies suitable, for example, for home appliances used in the kitchen or the bathroom, automotive applications, and e‐paper. In this work, the development of transparent and flexible touch panels for moist environments is reported. A piezoelectric polymer, poly(vinylidene difluoride) (PVDF), is used as a functional substrate material. Transparent electrodes are fabricated on both sides of a PVDF film using a graphene‐based ink and spray coating. The excellent performance of the touch panels is demonstrated in moist and underwater conditions. Also, the transparent device shows very small pyroelectric response to radiative heating in comparison to a non‐transparent device. Solution processable electrode materials in combination with functional substrates allow the low‐cost and high‐throughput manufacturing of touch panels using printing technologies.

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Low-cost, solution processable carbon nanotube supercapacitors and their characterization

Cited by 35 publications

References 28 publications

Cellulose Nanofibril Film as a Piezoelectric Sensor Material

Cellulose Nanofibril Film as a Piezoelectric Sensor Material

Measuring optical anisotropy in poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) films with added graphene

Printable, Transparent, and Flexible Touch Panels Working in Sunlight and Moist Environments

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