scholarly journals Electrical and Mechanical Properties of Ink Printed Composite Electrodes on Plastic Substrates

2018 ◽  
Vol 8 (11) ◽  
pp. 2101 ◽  
Author(s):  
Xinda Wang ◽  
Wei Guo ◽  
Ying Zhu ◽  
Xiaokang Liang ◽  
Fude Wang ◽  
...  
Keyword(s):  
Radio Frequency Identification ◽  
Silver Nanowire ◽  
Wearable Electronics ◽  
Composite Electrodes ◽  
Flexible Displays ◽  
Bending Tests ◽  
Conductive Inks ◽  
Plastic Substrates ◽  
Frequency Identification ◽  
Binder Free

Printed flexible electrodes with conductive inks have attracted much attention in wearable electronics, flexible displays, radio-frequency identification, etc. Conventional conductive inks contain large amount of polymer which would increase the electrical resistivity of as-printed electrodes and require high sintering temperature. Here, composite electrodes without cracks were printed on polyimide substrate using binder-free silver nanoparticle based inks with zero-dimensional (activated carbon), one-dimensional (silver nanowire and carbon nanotube) or two-dimensional (graphene) fillers. The effect of fillers on resistivity and flexibility of printed composite electrodes were evaluated. The graphene filler could reduce the resistivity of electrodes, reaching 1.7 × 10−7 Ω·m after low power laser sintering, while the silver nanowire filler improved their flexibility largely during bending tests. The microstructural changes were examined to understand the nanojoining process and their properties.

scholarly journals Printable Stretchable Silver Ink and Application to Printed RFID Tags for Wearable Electronics

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 3036 ◽  
Author(s):  
Tao Zhong ◽  
Ning Jin ◽  
Wei Yuan ◽  
Chunshan Zhou ◽  
Weibing Gu ◽  
...  
Keyword(s):  
Radio Frequency Identification ◽  
High Performance ◽  
Rfid Tags ◽  
Wearable Electronics ◽  
Rfid Tag ◽  
Silver Ink ◽  
Bulk Silver ◽  
Endurance Tests ◽  
Frequency Identification ◽  
Small Cracks

A printable elastic silver ink has been developed, which was made of silver flakes, dispersant, and a fluorine rubber and could be sintered at a low temperature. The printed elastic conductors showed low resistivity at 21 μΩ·cm, which is about 13.2 times of bulk silver (1.59 μΩ·cm). Their mechanical properties were investigated by bending, stretching, and cyclic endurance tests. It was found that upon stretching the resistance of printed conductors increased due to deformation and small cracks appeared in the conductor, but was almost reversible when the strain was removed, and the recovery of conductivity was found to be time dependent. Radio-frequency identification (RFID) tags were fabricated by screen printing the stretchable silver ink on a stretchable fabric (lycra). High performance of tag was maintained even with 1000 cycles of stretching. As a practical example of wearable electronics, an RFID tag was printed directly onto a T-shirt, which demonstrated its normal working order in a wearing state.

scholarly journals HABITAT: An IoT Solution for Independent Elderly

Sensors ◽  
2019 ◽  
Vol 19 (5) ◽  
pp. 1258 ◽  
Author(s):  
Elena Borelli ◽  
Giacomo Paolini ◽  
Francesco Antoniazzi ◽  
Marina Barbiroli ◽  
Francesca Benassi ◽  
...  
Keyword(s):  
Internet Of Things ◽  
Radio Frequency Identification ◽  
Life Quality ◽  
The Elderly ◽  
System Level ◽  
Smart Devices ◽  
The Internet ◽  
Wearable Electronics ◽  
Frequency Identification ◽  
The Internet Of Things

In this work, a flexible and extensive digital platform for Smart Homes is presented, exploiting the most advanced technologies of the Internet of Things, such as Radio Frequency Identification, wearable electronics, Wireless Sensor Networks, and Artificial Intelligence. Thus, the main novelty of the paper is the system-level description of the platform flexibility allowing the interoperability of different smart devices. This research was developed within the framework of the operative project HABITAT (Home Assistance Based on the Internet of Things for the Autonomy of Everybody), aiming at developing smart devices to support elderly people both in their own houses and in retirement homes, and embedding them in everyday life objects, thus reducing the expenses for healthcare due to the lower need for personal assistance, and providing a better life quality to the elderly users.

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