Flexible Encapsulation: Flexible Lamination Encapsulation (Adv. Mater. 29/2015)

Abstract

A novel flexible‐encapsulation method (Flex Lami‐capsulation), which laminates a simple metal foil/rubbery polymer bilayer on flexible devices, is reported on page 4308 by T.‐W. Lee and co‐workers. Flex Lami‐capsulation can be applied to the roll‐to‐roll process for mass production of flexible electronic devices, and overcomes the drawbacks of conventional rigid glass and thin‐film encapsulation methods.

Advances in Wearable Strain Sensors Based on Electrospun Fibers

“…The use of specially structured collectors, [115][116][117][118][119] post-treatment of primary spun films (e.g., printing, chemical etching [120,121] and photolithography [122,123] ), and the use of near-field electrospinning [124,125] are the three main routes that have been developed to enable the preparation of patterned electrospun fiber mats. Fibers tend to be deposited on collectors with opposite charges, so patterned fiber mats can be obtained using collectororiented traction nanofibers of a specific shape (Figure 3j).…”

Patterned, highly stretchable and conductive nanofibrous PANI/PVDF strain sensors based on electrospinning and in situ polymerization

“…patterned fibrous membranes, is very useful in many fields, such as microelectronic and photonic devices, 6,7 artificial tissue scaffolds and drug delivery systems. [8][9][10][11][12][13][14][15][16][17][18] Furthermore, owing to the random fiber orientation of nonwoven membranes, some features and applications are limited. For example, the sensor made of poly (3,4-ethylenedioxythiophene):poly(styrene sulfonate)-poly(vinyl alcohol) (PEDOT:PSS-PVA) as-spun nanofibrous membranes could only bear a small strain of 1.2%, 19,20 electrospun PVDF nonwoven membranes coated with polypyrrole (PPY) could endure a strain of 2.8%, 21 and electrospun PVDF nonwoven mats coated with PANI could withstand a larger strain up to 14.5%.…”

“…For example, the sensor made of poly (3,4-ethylenedioxythiophene):poly(styrene sulfonate)-poly(vinyl alcohol) (PEDOT:PSS-PVA) as-spun nanofibrous membranes could only bear a small strain of 1.2%, 19,20 electrospun PVDF nonwoven membranes coated with polypyrrole (PPY) could endure a strain of 2.8%, 21 and electrospun PVDF nonwoven mats coated with PANI could withstand a larger strain up to 14.5%. 22 On the other hand, three main methods have been developed to control the pattern of the nanofibrous membrane by changing the configuration 8,9 or surface architectures [13][14][15][16][17][18] of the collectors, post-processing treatment of the as-spun membranes, 10,11 and near-field electrospinning. 12 Among them, using a collector with special architectures 5,[8][9][10][11][12][13][14][15][16][17][18] is the most simple and effective method.…”

“…22 On the other hand, three main methods have been developed to control the pattern of the nanofibrous membrane by changing the configuration 8,9 or surface architectures [13][14][15][16][17][18] of the collectors, post-processing treatment of the as-spun membranes, 10,11 and near-field electrospinning. 12 Among them, using a collector with special architectures 5,[8][9][10][11][12][13][14][15][16][17][18] is the most simple and effective method. Nevertheless, previous studies were mainly focused on two aspects of the patterned membranes.…”

“…One is the formation mechanism of patterned structures via electrospinning, which can be attributed to the redistribution of the static electric field. 17 Another is the biomedical application of patterned nanofibrous membranes, [8][9][10][11][12][13][14][15][16][17][18] because of the similarity in structural geometries between electrospun nanofibrous scaffolds to those of the natural extracellular matrix found in the human body. However, patterned nanofibrous membranes with good electrical and mechanical properties have rarely been reported, which may be used in cutting-edge flexible/stretchable electronics.…”