Large‐Scale Highly Aligned Nanowire Printing

Lee, Yeongjun; Min, Sung‐Yong; Lee, Tae‐Woo

doi:10.1002/mame.201600507

Cited by 23 publications

(21 citation statements)

References 66 publications

(208 reference statements)

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“…However, when subjected to practical applications, traditional polymer in most of these sensors will be broken, the AgNWs conductive network will then be subsequently destroyed. If the AgNWs were not interconnected, the sensors would not transmit signal any more . Thus, an ideal flexible strain sensor should not only retain high flexibility, but also could be rapidly healed after mechanical damage …”

Section: Introductionmentioning

confidence: 99%

Flexible Sandwich Structural Strain Sensor Based on Silver Nanowires Decorated with Self‐Healing Substrate

Jiang

Wang

et al. 2019

Macro Materials & Eng

196

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Flexible and stretchable conducting composites that can sense stress or strain are needed for several emerging fields including human motion detection and personalized health monitoring. Silver nanowires (AgNWs) have already been used as conductive networks. However, once a traditional polymer is broken, the conductive network is subsequently destroyed. Integrating high pressure sensitivity and repeatable self‐healing capability into flexible strain sensors represents new advances for high performance strain sensing. Herein, superflexible 3D architectures are fabricated by sandwiching a layer of AgNWs decorated self‐healing polymer between two layers of polydimethylsiloxane, which exhibit good stability, self‐healability, and stretchability. For better mechanical properties, the self‐healing polymer is reinforced with carbon fibers (CFs). The sensors based on self‐healing polymer and AgNWs conductive network show high conductivity and excellent ability to repair both mechanical and electrical damage. They can detect different human motions accurately such as bending and recovering of the forearm and shank, the changes of palm, fist, and fingers. The fracture tensile stress of the reinforced self‐healing polymer (9 wt% CFs) is increased to 10.3 MPa with the elongation at break of 8%. The stretch/release responses under static and dynamic loads of the sensor have a high sensitivity, large sensing range, excellent reliability, and remarkable stability.

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Section: Introductionmentioning

confidence: 99%

Flexible Sandwich Structural Strain Sensor Based on Silver Nanowires Decorated with Self‐Healing Substrate

Jiang

Wang

et al. 2019

Macro Materials & Eng

196

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“…Due to the relatively low electrical conductivity of large‐scale graphene and high contact resistance of carbon nanotubes, the applications of these carbon‐based nanomaterials are highly limited. And further on the poor conductivity and instability of conducting polymers, MNEs are a strong candidate due to their superior electrical and optical performance …”

Section: Introductionmentioning

confidence: 99%

High‐Performance, Micrometer Thick/Conformal, Transparent Metal‐Network Electrodes for Flexible and Curved Electronic Devices

Liu

Xiao

Rao

et al. 2018

Adv Materials Technologies

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deposition temperature (≈300 °C) limit their applications in large-area/flexible/ curved optoelectronic devices. Therefore, several candidates, including carbon nanotubes, [4,10] graphene, [11,12] conductive polymers, [13,14] and metal-network electrodes (MNEs) [15,16] were investigated to replace ITO films. Due to the relatively low electrical conductivity of large-scale graphene and high contact resistance of carbon nanotubes, the applications of these carbon-based nanomaterials are highly limited. And further on the poor conductivity and instability of conducting polymers, MNEs are a strong candidate due to their superior electrical and optical performance. [17][18][19] The solution-processed metal nanowires such as Ag NWs [20,21] and Cu NWs [22][23][24] are excellent materials to structure high-property electrodes by a coating process. [25] However, the contact resistance at the nanogap junctions between these nanowires results in much lower conductivity compared to the evaporated metal electrodes. Moreover, the poor adhesion [26] and protrusions [27] limit the applications of these solution-processed electrodes. The continuous metal nanowires could be fabricated by the using of a electrospun nonwoven masks [28][29][30][31][32] before the metal evaporation process and avoids the influence of contact resistance. But the disorderly arrangement of metal nanowires makes the inhomogeneity of film conductivity and results in the inferior quality of electrodes. Screen printing or inkjet printing can construct and arrange metal nanowires networks by using the metal precursor solution [33,34] or metal nanoparticle pastes, [35][36][37] but usually requiring a high temperature annealing (>200 °C) process. The high temperature heavily limits the selection of polymeric/elastomeric substrates. Therefore, in addition to transparency and resistance, low preparation temperature is very important in flexible MNEs.In this work, we reported highly transparent, ultrathin/ curved MNEs fabricated by programmable electrohydrodynamic (EHD) lithography, which directly generates high-resolution pattern of photoresist on ultrathin and curved substrates. The EHD lithography technique is a simple, data-driven, and inexpensive process, avoiding exposure or development process of conventional photolithography. [38] Moreover, it does not require high-temperature heat treatment and complicated transferring, Metal-network electrodes (MNEs) are excellent substitutes to the brittle and expensive indium tin oxide (ITO) films for flexible and transparent electronic devices. For a high transmittance and low resistivity, highly ordered metal wire arrays with suitable gap and width are essential. Here, high-orderly and dimension-controllable ultrathin/conformal MNEs are fabricated on µm thick/curved substrate via programmable electrohydrodynamic (EHD) lithography. By employing EHD direct-writing, large-scale high-resolution photoresist micro/nano-pattern can be digitally printed on ultrathin/curved substrates, as the digital mask in chemical etching ...

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“…Under the stretching of collector speed, an EDW jet can be deposited to print orderly straight lines, which has attracted lots of interests from researchers [ 10 , 11 , 12 , 13 ]. Bu et al [ 14 ] reported the method of mechano-electrospinning (MES) with the help of a mechanical drawing force for high-speed collectors to direct-write oriented nanofiber with high deposition accuracy.…”

Section: Introductionmentioning

confidence: 99%

Electrohydrodynamic Direct-Writing Micropatterns with Assisted Airflow

Jiang

Wang

et al. 2018

Micromachines

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Electrohydrodynamic direct-writing (EDW) is a developing technology for high-resolution printing. How to decrease the line width and improve the deposition accuracy of direct-written patterns has been the key to the promotion for the further application of EDW. In this paper, an airflow-assisted spinneret for electrohydrodynamic direct-writing was designed. An assisted laminar airflow was introduced to the EDW process, which provided an additional stretching and constraining force on the jet to reduce the surrounding interferences and enhance jet stability. The flow field and the electric field around the spinneret were simulated to direct the structure design of the airflow-assisted spinneret. Then, a series of experiments were conducted, and the results verified the spinneret design and demonstrated a stable ejection of jet in the EDW process. With assisted airflow, the uniformity of printed patterns and the deposition position accuracy of a charged jet can be improved. Complex patterns with positioning errors of less than 5% have been printed and characterized, which provide an effective way to promote the integration of micro/nanosystems.

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Large‐Scale Highly Aligned Nanowire Printing

Cited by 23 publications

References 66 publications

Flexible Sandwich Structural Strain Sensor Based on Silver Nanowires Decorated with Self‐Healing Substrate

Flexible Sandwich Structural Strain Sensor Based on Silver Nanowires Decorated with Self‐Healing Substrate

High‐Performance, Micrometer Thick/Conformal, Transparent Metal‐Network Electrodes for Flexible and Curved Electronic Devices

Electrohydrodynamic Direct-Writing Micropatterns with Assisted Airflow

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