Optimisation of carbon nanotube ink for large-area transparent conducting films fabricated by controllable rod-coating method

Meng, Yan; Xü, Xinsheng; Li, Hu; Wang, Yan; Ding, Er‐Xiong; Zhang, Zechen; Geng, Hong-Zhang

doi:10.1016/j.carbon.2013.12.078

Cited by 42 publications

(41 citation statements)

References 32 publications

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“…To achieve a Meyer rod coating with minimal defects, the viscosity of the fluid should be high enough to resist secondary flows induced by dewetting and surface tension. [25,26] The coacervate suspensions are suitable candidates for these coatings as they remain within the range of viscosity suitable for the Meyer rod technique (300-800 mPa s -1 ). [27] The complex coacervate with 1.0 m NaCl was used for the gas barrier film because its viscosity remains suitable over a wide range of shear rates (0.2-100.0 s −1 ).…”

Section: Resultsmentioning

confidence: 99%

Polyelectrolyte Coacervates Deposited as High Gas Barrier Thin Films

Haile

Sarwar

Henderson

et al. 2016

Macromol. Rapid Commun.

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Multilayer films deposited from water using layer-by-layer (LbL) assembly have shown extraordinarily low oxygen permeability and are of high interest due to their robustness, tailorability, and ease of fabrication. [5][6][7][8][9] Despite all the advantages associated with LbL assembly, the large number of processing steps remains a considerable challenge for commercial use. [10,11] In order to apply films composed of oppositely charged polyelectrolytes to substrates using just one or two deposition steps, solutions containing polyelectrolyte complexes (PECs) can be employed. [12][13][14][15] PECs are formed by the entropy-driven association of oppositely charged polyelectrolytes in water and can exist as stable colloids, flocculants, or metastable coacervates. [16][17][18][19][20] Governed by conditions such as pH and ionic strength, PEC coacervation is marked by a liquid-liquid phase separation, where a polymer rich coacervate phase is in equilibrium with a polymer poor solution phase. PEC coacervates are composed of weakly bound polyelectrolytes, and have viscous liquid-like behavior that can be exploited to quickly apply them as thin films. [18,[21][22][23][24] In the present study, polyelectrolyte coacervates were applied to substrates using Meyer rod coating (a common type of blade coating), [25] in an effort to quickly fabricate thin oxygen barrier films in a single step. The Meyer rod is drawn across a substrate, doctoring off coating fluid, Multilayer coatings consisting of oppositely charged polyelectrolytes have proven to be extraordinarily effective oxygen barriers but require many processing steps to fabricate. In an effort to prepare high oxygen barrier thin films more quickly, a polyelectrolyte complex coacervate composed of polyethylenimine and polyacrylic acid is prepared. The coacervate fluid is applied as a thin film using a rod coating process. With humidity and thermal posttreatment, a 2 µm thin film reduces the oxygen transmission rate of 0.127 mm poly(ethylene terephthalate) by two orders of magnitude, rivalling conventional oxygen barrier technologies. These films are fabricated in ambient conditions using low-cost, water-based solutions, providing a tremendous opportunity for single-step deposition of polymeric high barrier thin films.

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Section: Resultsmentioning

confidence: 99%

Polyelectrolyte Coacervates Deposited as High Gas Barrier Thin Films

Haile

Sarwar

Henderson

et al. 2016

Macromol. Rapid Commun.

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“…A dispersão dos NTCPMs foi feita com auxílio de surfactante dodecilbenzenossulfonato de sódio (SDBS). A solução de SDBS 1% m/m foi feita com água miliQ e solubilizada com auxílio de ultrassom de banho por 10 min (Meng et al, 2014). Após, os NTCPMs foram adicionados na solução de SDBS, e para auxiliar na dispersão foi colocado em ultrassom de ponteira por 36 min com banho de gelo, pulso de 30s/59s e intervalo de 5 min a cada 12 min de funcionamento do equipamento para reduzir ao máximo o aquecimento da dispersão e do equipamento.…”

Section: Dispersão Dos Nanotubos De Carbonounclassified

“…As primeiras tentativas de deposição de FCT de NTC foram feitas por evaporação de solvente (Meitl et al, 2004). Posteriormente, outras técnicas de deposição de filmes começaram a ser estudadas para os NTC, como spin coating, dipcoating (Mirri et al, 2012), rodcoating (Dan et al, 2009) e deposição por spray (Meng et al, 2014;Abdelhalim et al, 2013). Apesar de já registrado na literatura, a deposição por spray para obtenção de filmes de NTCs não foi muito explorada.…”

Section: Introductionunclassified

Filmes finos de nanotubos de carbono de parede múltipla preparados via spray

Rodrigues

Osório

Bergmann

2017

RBES

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Neste estudo foram fabricados filmes finos de nanotubos de carbono de parede múltipla depositados via spray. Os nanotubos de carbono foram sintetizados por decomposição térmica de ferroceno utilizando sílica como substrato. Bandas características dos nanotubos de carbono, D, G e G’, e ausência da Região de Respiração Radial foram observadas por espectroscopia Raman, evidenciando a presença de nanotubos de carbono de parede múltipla. Foi comprovada capacidade ferromagnética do material através de magnetômetro de amostra vibrante. Os nanotubos de carbono foram dispersos em água com auxílio do surfactante dodecilbenzenossulfonato de sódio para aumento da molhabilidade. Os parâmetros de deposição otimizados foram 0,1 mg/mL de nanotubos de carbono, temperatura de 150 °C, distância de 15 cm, pressão entre 1 e 2 bar e tempo de deposição entre 10 e 40 s. Após as deposições a superfície dos filmes foram observadas por microscópio óptico e a transmitância foi verificada por espectroscopia UV-visível. Os resultados indicaram que os filmes são heterogêneos e rugosos, apresentam redução da transmitância com o aumento do tempo de deposição e redução da espessura com o aumento da pressão.

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“…TCFs fabricated using single-walled CNTs (SWCNTs) are widely explored in numerous applications such as electron field emitters [7], supercapacitors [8], thin-film transistors [9], organic photovoltaics [10], and organic light emitting diodes (OLEDs) [11,12]. TCFs have been fabricated using CNTs by various methods, such as vacuum filtration [13,14], spin coating [15], spray coating [16,17], dip coating [18], inkjet printing [19,20], gel coating [21], Mayer rod coating [22,23] and self-assembly methods [24]. Spray coating can easily generate large area films on suitable substrates.…”

Section: Introductionmentioning

confidence: 99%