Highly Conductive Flexible Multi-Walled Carbon Nanotube Sheet Films for Transparent Touch Screen

Jung, Daewoong; Lee, Kyung Hwan; Kim, Dong-Hyun; Burk, D.E.; Overzet, Lawrence; Lee, Gil Sik

doi:10.7567/jjap.52.03bc03

Cited by 40 publications

(25 citation statements)

References 42 publications

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“…However, we note that the brightness decreases slightly with nanotubes in the metal layer while the turn‐on voltage increases. This can be understood in terms of the relatively poor conductivity of MWCNTs (0.5–1 kΩ ◻ −1 ) compared to Al (≈0.3 Ω ◻ −1 ). Quite simply, as more of the Al volume is replaced by the poorer conducting nanotubes, the overall conductivity of the system begins to drop proportionally and there is a potential drop now across the electrode.…”

Section: Resultsmentioning

confidence: 99%

Layered, Nanonetwork Composite Cathodes for Flexible, High‐Efficiency, Organic Light Emitting Devices

Smith

Dun

et al. 2015

Adv Funct Materials

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4397wileyonlinelibrary.com circuit simplicity when interfacing to standard AC power sources. However, as with all ultrathin or organic lighting approaches, a widely sought property of the AC-OEL is fl exibility.The concept of low-cost, fl exible, higheffi ciency light sources based on organic solid-state lighting devices is already well established. [14][15][16][17][18][19] Indeed, both standard organic light emitting diodes (OLEDs) as well as AC-OELs have demonstrated brightness and effi ciency numbers of commercial interest. However, the slow transition from state-of-the-art laboratory research to a modern manufacturing environment should somehow indicate the magnitude of the challenges faced by the technologies to meet with robust utilization in the consumer world. [ 20 ] Two key problems that developers are facing are addressed in this work.The fi rst is how to achieve extremely high-power effi ciencies in lighting devices when internal quantum effi ciencies are already reaching levels approaching 100% (both the spin-symmetric and antisymmetric molecular excitations are fully used for photon emission. [21][22][23][24][25] In any organic EL device, there are many energy loss mechanisms from carrier transport to multiple nonradiative processes that convert singlet and triplet excitations into the ground state. [21][22][23][24] Among these mechanisms, an important problem in OLEDs is direct injection of hot carriers, which form bound electron-hole pairs or excitons after tunneling through energy barriers at multiple interfaces. [26][27][28][29] These hot carriers exceed the energy gap of the emitting material, so the excess energy is wasted thermally, giving rise to a lower power effi ciency. The reduction of the carrier injection barrier by decreasing the difference between adjacent energy levels (highest occupied molecular orbital (HOMO) or lowest unoccupied molecular orbital (LUMO)) is now a common method to optimize the efficiency of OLEDs. [30][31][32][33][34] However, as in the case with most technology demonstrators, what works best in the lab is diffi cult to implement in commercial settings, so placing Li or Ca at the metal interface is undesirable.In the case of capacitively coupled AC-OEL devices, as described here, the large induced polarization currents effectively control the rate and energy of carrier "injection." While power effi ciencies as high as 29.3 lm W −1 at 20 500 cd m −2 have been reported in green phosphorescent AC-OEL devices, it has In this work, the application of an aluminum (Al)/multiwall carbon nanotube (MWCNT)/Al, multilayered electrode to fl exible, high-effi ciency, alternating current driven organic electroluminescent devices (AC-OEL), is reported. The electrode is fabricated by sandwiching a spray-cast nanonetwork fi lm of MWCNTs between two evaporated layers of Al. The resulting composite fi lm facilitates a uniform charge distribution across a robust crack-free electrode under various bending angles. It is demonstrated that these composite electrodes stabilize the power eff...

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Section: Resultsmentioning

confidence: 99%

Layered, Nanonetwork Composite Cathodes for Flexible, High‐Efficiency, Organic Light Emitting Devices

Smith

Dun

et al. 2015

Adv Funct Materials

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“…For steady-state heat conduction, the heat flux is proportional to the temperature gradient along the direction of flow in the material and the thermal conductivity is the proportionality constant. 34,36 The MWCNT sheets were made from numerous individual MWCNTs, of which some MWCNTs in the sheet might be separated and be unable to generate heat (Fig. The electro-heating performance of the CNT sheet (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…33,34 They exhibited stable, reliable, and superior thermal characteristics. Moreover, a simple acid treatment could reduce their sheet resistance (R s ), 36 which means the effective power (V 2 /R) can be increased to generate heat. Moreover, the measured steadystate temperatures were relatively low compared to others 25,35 and should be tested on polymer substrates for flexible applications, such as curved windows.…”

Section: Introductionmentioning

confidence: 99%

Flexible transparent conductive heater using multiwalled carbon nanotube sheet

Jung

Han

Lee

2014

Journal of Vacuum Science &Amp; Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phen

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High strain biocompatible polydimethylsiloxane-based conductive graphene and multiwalled carbon nanotube nanocomposite strain sensors Appl. Phys. Lett. 102, 183511 (2013); 10.1063/1.4804580Graphene wrapped multiwalled carbon nanotubes dispersed nanofluids for heat transfer applications This paper reports highly flexible, transparent, conducting heaters based on multiwalled carbon nanotube (MWCNT) sheets. The MWCNT sheets were spun directly from a well-aligned MWCNT forest. The fabrication of the MWCNT sheet heater was quite simple and suitable for mass production, requiring only a one-step transferring process, in which the MWCNT sheet is drawn onto the target substrates. This study examined the parameters that affect the heat generation of the MWCNT sheet-based heater; input power, surface area, and thermal conductivity of the substrate. In particular, more effort was focused on how to increase the surface area and contact points between the individual MWCNTs; simple acid treatment and added metal nanoparticles increased the heat performance of the heater dramatically. Moreover, the heaters exhibited durability and flexibility against many bending cycles. Therefore, the MWCNT sheet-based heater can be used for versatile applications requiring transparency, conduction, and flexibility.

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“…Smart windows composed of transparent solar cells, electrochromic windows and transparent energy storage devices would produce electricity and visual comfort benefits during the day while output the stored energy to light the building at night. Currently, great efforts have been devoted to develop various transparent electronics components, e. g., displays, transistors, circuits, touch screens . However, the fabrication of transparent energy storage devices is still in the early stages.…”

Section: Introductionmentioning

confidence: 99%

Nano‐Engineered Materials for Transparent Supercapacitors

Wang

Liu

2019

ChemNanoMat

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Transparent supercapacitors are interesting for energy storage and management in future transparent electronics and have become an intriguing research topic at the interface of materials science, energy and electronics research. This minireview presents the recent progress in transparent supercapacitors, particularly the use of nano-engineered materials to construct transparent electrodes. Focusing on the two key features of transparency and capacitance, we analyze the influences of nanostructures on the electrode and device performances, and present the outlook the future perspectives for transparent supercapacitors.[a] J.

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Highly Conductive Flexible Multi-Walled Carbon Nanotube Sheet Films for Transparent Touch Screen

Cited by 40 publications

References 42 publications

Layered, Nanonetwork Composite Cathodes for Flexible, High‐Efficiency, Organic Light Emitting Devices

Layered, Nanonetwork Composite Cathodes for Flexible, High‐Efficiency, Organic Light Emitting Devices

Flexible transparent conductive heater using multiwalled carbon nanotube sheet

Nano‐Engineered Materials for Transparent Supercapacitors

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