J. Semicond. > Volume 39 > Issue 1 > Article Number: 013001

Silver nanowire/polymer composite soft conductive film fabricated by large-area compatible coating for flexible pressure sensor array

Sujie Chen , Siying Li , Sai Peng , Yukun Huang , Jiaqing Zhao , Wei Tang and Xiaojun Guo ,

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Abstract: Soft conductive films composed of a silver nanowire (AgNW) network, a neutral-pH PEDOT:PSS over-coating layer and a polydimethylsiloxane (PDMS) elastomer substrate are fabricated by large area compatible coating processes. The neutral-pH PEDOT:PSS layer is shown to be able to significantly improve the conductivity, stretchability and air stability of the conductive films. The soft conductive films are patterned using a simple maskless patterning approach to fabricate an 8 × 8 flexible pressure sensor array. It is shown that such soft conductive films can help to improve the sensitivity and reduce the signal crosstalk over the pressure sensor array.

Key words: pressure sensorwearable electronicssilver nanowirePDMSblade-coatingbar-coating

Abstract: Soft conductive films composed of a silver nanowire (AgNW) network, a neutral-pH PEDOT:PSS over-coating layer and a polydimethylsiloxane (PDMS) elastomer substrate are fabricated by large area compatible coating processes. The neutral-pH PEDOT:PSS layer is shown to be able to significantly improve the conductivity, stretchability and air stability of the conductive films. The soft conductive films are patterned using a simple maskless patterning approach to fabricate an 8 × 8 flexible pressure sensor array. It is shown that such soft conductive films can help to improve the sensitivity and reduce the signal crosstalk over the pressure sensor array.

Key words: pressure sensorwearable electronicssilver nanowirePDMSblade-coatingbar-coating



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Li Y, Samad Y A, Liao K. From cotton to wearable pressure sensor. J Mater Chem A, 2015, 3: 2181

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Chen S, Zhuo B, Guo X. Large area one-step facile processing of picrostructured elastomeric dielectric film for high sensitivity and durable sensing over wide pressure range. ACS Appl Mater Interfaces, 2016, 8: 20364

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Joo Y, Byun J, Seong N, et al. Silver nanowire-embedded PDMS with a multiscale structure for a highly sensitive and robust flexible pressure sensor. Nanoscale, 2015, 7: 6208

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Chen S, Guo X. Improving the sensitivity of elastic capacitive pressure sensors using silver nanowire mesh electrodes. IEEE Nanotechnol, 2015, 14: 619

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Yao S, Zhu Y. Wearable multifunctional sensors using printed stretchable conductors made of silver nanowires. Nanoscale, 2015, 6: 2345

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Kwon D, Lee T I, Shim J, et al. Highly sensitive, flexible, and wearable pressure sensor based on a giant piezocapacitive effect of three-dimensional microporous elastomeric dielectric layer. ACS Appl Mater Interfaces, 2016, 8: 16922

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Tee B C K, Chortos A, Dunn R R, et al. Tunable flexible pressure sensors using microstructured elastomer geometries for intuitive electronics. Adv Funct Mater, 2014, 24: 5427

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Kang S, Lee J, Lee S, et al. Highly sensitive pressure sensor based on bioinspired porous structure for real-time tactile sensing. Adv Electron Mater, 2016, 12: 1600356

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Lee B Y, Kim J, Kim H, et al. Low-cost flexible pressure sensor based on dielectric elastomer film with micro-pores. Sens Actuators A, 2016, 240: 103

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Madaria A R, Kumar A, Ishikawa F N, et al. Uniform, highly conductive, and patterned transparent films of a percolating silver nanowire network on rigid and flexible substrates using a dry transfer technique. Nano Res, 2010, 3: 564

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Vosgueritchian M, Lipomi D J, Bao Z. Highly conductive and transparent PEDOT:PSS films with a fluorosurfactant for stretchable and flexible transparent electrodes. Adv Funct Mater, 2012, 22: 421

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Mirri F, Ma A W K, Hsu T T, et al. High-performance carbon nanotube transparent conductive films by scalable dip coating. ACS Nano, 2012, 6: 9737

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Wang Y, Tong S W, Xu X F, et al. Interface engineering of layer-by-layer stacked graphene anodes for high-performance organic solar cells. Adv Mater, 2011, 23: 1514

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Yu J S, Kim I, Kim J S, et al. Silver front electrode grids for ITO-free all printed polymer solar cells with embedded and raised topographies, prepared by thermal imprint, f1 exographic and inkjet roll-to-roll processes. Nanoscale, 2012, 4: 6032

[23]

Hu L, Kim H S, Lee J Y, et al. Scalable coating and properties of transparent, flexible, silver nanowire electrodes. ACS Nano, 2010, 4: 2955

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Choi D Y, Kang H W, Sung H J, et al. Annealing-free, flexible silver nanowire-polymer composite electrodes via a continuous two-step spray-coating method. Nanoscale, 2013, 5: 977

[25]

Chen S, Song L, Tao Z, et al. Neutral-pH PEDOT:PSS as the over-coating layer for stable silver nanowire flexible transparent conductive films. Org Electron, 2014, 15: 3654

[26]

Zhuo B, Chen S, Zhao M, et al. High sensitivity flexible capacitive pressure sensor using polydimethylsiloxane elastomer dielectric layer micro-structured by three-dimensional printed mold. IEEE J Electron Devices, 2017, 5: 219

[27]

Chen S, Cui Q, Guo X. Annealing-free solution processed silver nanowire-polymer composite transparent electrodes and flexible device applications. IEEE Nanotechnol, 2014, 14: 36

[1]

Lai Y C, Ye B W, Lu C F, et al. Extraordinarily sensitive and low-voltage operational cloth-based electronic skin for wearable sensing and multifunctional integration uses: a tactile-induced insulating-to-conducting transition. Adv Funct Mater, 2016, 26: 1286

[2]

Lee J, Kwon H, Seo J, et al. Conductive fiber-based ultrasensitive textile pressure sensor for wearable electronics. Adv Mater, 2015, 27: 2433

[3]

Li Y, Samad Y A, Liao K. From cotton to wearable pressure sensor. J Mater Chem A, 2015, 3: 2181

[4]

Chen S, Zhuo B, Guo X. Large area one-step facile processing of picrostructured elastomeric dielectric film for high sensitivity and durable sensing over wide pressure range. ACS Appl Mater Interfaces, 2016, 8: 20364

[5]

Pang C, Lee G Y, Kim T I, et al. A flexible and highly sensitive strain-gauge sensor using reversible interlocking of nanofibres. Nat Mater, 2012, 11: 795

[6]

Joo Y, Byun J, Seong N, et al. Silver nanowire-embedded PDMS with a multiscale structure for a highly sensitive and robust flexible pressure sensor. Nanoscale, 2015, 7: 6208

[7]

Chen S, Guo X. Improving the sensitivity of elastic capacitive pressure sensors using silver nanowire mesh electrodes. IEEE Nanotechnol, 2015, 14: 619

[8]

Yao S, Zhu Y. Wearable multifunctional sensors using printed stretchable conductors made of silver nanowires. Nanoscale, 2015, 6: 2345

[9]

Kwon D, Lee T I, Shim J, et al. Highly sensitive, flexible, and wearable pressure sensor based on a giant piezocapacitive effect of three-dimensional microporous elastomeric dielectric layer. ACS Appl Mater Interfaces, 2016, 8: 16922

[10]

Li T, Luo H, Qin L, et al. Flexible capacitie tactile sensor based on micropatterned dielectric layer. Small, 2016, 12: 5042

[11]

Pang C, Koo J H, Nguyen A, et al. Highly skin-conformal microhairy sensor for pulse signal amplification. Adv Mater, 2015, 27: 634

[12]

Boutry C M, Nguyen A, Lawal Q O, et al. A sensitive and biodegradable pressure sensor array for cardiovascular monitoring. Adv Mater, 2015, 27: 6954

[13]

Tee B C K, Chortos A, Dunn R R, et al. Tunable flexible pressure sensors using microstructured elastomer geometries for intuitive electronics. Adv Funct Mater, 2014, 24: 5427

[14]

Madsen F B, Daugaard A E, Hvilsted S, et al. The current state of silicone-based dielectric elastomer transducers. Macromol Rapid Comm, 2016, 37: 378

[15]

Mannsfeld S C B, Tee B C K, Stoltenberg R M, et al. Highly sensitive flexible pressure sensors with microstructured rubber dielectric layers. Nat Mater, 2010, 9: 859

[16]

Kang S, Lee J, Lee S, et al. Highly sensitive pressure sensor based on bioinspired porous structure for real-time tactile sensing. Adv Electron Mater, 2016, 12: 1600356

[17]

Lee B Y, Kim J, Kim H, et al. Low-cost flexible pressure sensor based on dielectric elastomer film with micro-pores. Sens Actuators A, 2016, 240: 103

[18]

Madaria A R, Kumar A, Ishikawa F N, et al. Uniform, highly conductive, and patterned transparent films of a percolating silver nanowire network on rigid and flexible substrates using a dry transfer technique. Nano Res, 2010, 3: 564

[19]

Vosgueritchian M, Lipomi D J, Bao Z. Highly conductive and transparent PEDOT:PSS films with a fluorosurfactant for stretchable and flexible transparent electrodes. Adv Funct Mater, 2012, 22: 421

[20]

Mirri F, Ma A W K, Hsu T T, et al. High-performance carbon nanotube transparent conductive films by scalable dip coating. ACS Nano, 2012, 6: 9737

[21]

Wang Y, Tong S W, Xu X F, et al. Interface engineering of layer-by-layer stacked graphene anodes for high-performance organic solar cells. Adv Mater, 2011, 23: 1514

[22]

Yu J S, Kim I, Kim J S, et al. Silver front electrode grids for ITO-free all printed polymer solar cells with embedded and raised topographies, prepared by thermal imprint, f1 exographic and inkjet roll-to-roll processes. Nanoscale, 2012, 4: 6032

[23]

Hu L, Kim H S, Lee J Y, et al. Scalable coating and properties of transparent, flexible, silver nanowire electrodes. ACS Nano, 2010, 4: 2955

[24]

Choi D Y, Kang H W, Sung H J, et al. Annealing-free, flexible silver nanowire-polymer composite electrodes via a continuous two-step spray-coating method. Nanoscale, 2013, 5: 977

[25]

Chen S, Song L, Tao Z, et al. Neutral-pH PEDOT:PSS as the over-coating layer for stable silver nanowire flexible transparent conductive films. Org Electron, 2014, 15: 3654

[26]

Zhuo B, Chen S, Zhao M, et al. High sensitivity flexible capacitive pressure sensor using polydimethylsiloxane elastomer dielectric layer micro-structured by three-dimensional printed mold. IEEE J Electron Devices, 2017, 5: 219

[27]

Chen S, Cui Q, Guo X. Annealing-free solution processed silver nanowire-polymer composite transparent electrodes and flexible device applications. IEEE Nanotechnol, 2014, 14: 36

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S J Chen, S Y Li, S Peng, Y K Huang, J Q Zhao, W Tang, X J Guo, Silver nanowire/polymer composite soft conductive film fabricated by large-area compatible coating for flexible pressure sensor array[J]. J. Semicond., 2018, 39(1): 013001. doi: 10.1088/1674-4926/39/1/013001.

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Manuscript received: 01 August 2017 Manuscript revised: 07 November 2017 Online: Accepted Manuscript: 27 December 2017 Published: 01 January 2018

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