scholarly journals Highly conductive carbon-based aqueous inks toward electroluminescent devices, printed capacitive sensors and flexible wearable electronics

RSC Advances ◽  
2019 ◽  
Vol 9 (27) ◽  
pp. 15184-15189 ◽  
Author(s):  
Yu Liao ◽  
Rui Zhang ◽  
Hongxia Wang ◽  
Shuangli Ye ◽  
Yihua Zhou ◽  
...  
Keyword(s):  
Capacitive Sensors ◽  
Wearable Electronics ◽  
Electroluminescent Devices ◽  
Conductive Inks ◽  
Carbon Based

Carbon-based conductive inks are one of the most important materials in the field of printing electronics.

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 Tunable seesaw-like 3D capacitive sensor for force and acceleration sensing

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Jilong Ye ◽  
Fan Zhang ◽  
Zhangming Shen ◽  
Shunze Cao ◽  
Tianqi Jin ◽  
...  
Keyword(s):  
High Performance ◽  
Low Cost ◽  
High Sensitivity ◽  
Capacitive Sensor ◽  
Mechanical Tests ◽  
Structure Design ◽  
Capacitive Sensors ◽  
Wearable Electronics ◽  
Potential Applications ◽  
The Stability

AbstractTo address the resource-competing issue between high sensitivity and wide working range for a stand-alone sensor, development of capacitive sensors with an adjustable gap between two electrodes has been of growing interest. While several approaches have been developed to fabricate tunable capacitive sensors, it remains challenging to achieve, simultaneously, a broad range of tunable sensitivity and working range in a single device. In this work, a 3D capacitive sensor with a seesaw-like shape is designed and fabricated by the controlled compressive buckling assembly, which leverages the mechanically tunable configuration to achieve high-precision force sensing (resolution ~5.22 nN) and unprecedented adjustment range (by ~33 times) of sensitivity. The mechanical tests under different loading conditions demonstrate the stability and reliability of capacitive sensors. Incorporation of an asymmetric seesaw-like structure design in the capacitive sensor allows the acceleration measurement with a tunable sensitivity. These results suggest simple and low-cost routes to high-performance, tunable 3D capacitive sensors, with diverse potential applications in wearable electronics and biomedical devices.

scholarly journals Investigation of Carbon-Based Composites for Elastic Heaters and Effects of Hot Pressing in Thermal Transfer Process on Thermal and Electrical Properties

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7606
Author(s):  
Tomasz Raczyński ◽  
Daniel Janczak ◽  
Jerzy Szałapak ◽  
Piotr Walter ◽  
Małgorzata Jakubowska
Keyword(s):  
Flexible Electronics ◽  
Hot Pressing ◽  
Screen Printing ◽  
Printed Electronics ◽  
Wearable Electronics ◽  
Thermal Transfer ◽  
Wide Range ◽  
Thermal And Electrical Properties ◽  
Carbon Based ◽  
Screen Printed

Wearable electronics are new structures with a wide range of possible applications. This study aims to analyze the effects of hot pressing in thermal transfer of different carbon-based composites as a new application method of screen-printed electronics on textiles. Flexible heaters were screen-printed on polyethylene terephthalate PET foil with composites based on graphene, carbon black, and graphite with different wt.%, measured and then hot pressed to measure and analyze differences. Research showed that the hot pressing process in thermal transfer resulted in decreased electrical resistance, increased power, and higher maximal temperatures. Best results were achieved with composites based on 12 wt.% graphene with sheet resistance lowered by about 40% and increased power by about 110%. This study shows promise for thermal transfer and screen-printing combination as an alternative for creating flexible electronics on textiles.

Electrogenerated chemiluminescence from carbon dots

2011 ◽  
Vol 1284 ◽  
Author(s):  
L. Sun ◽  
T.-H. Teng ◽  
Md. H. Rashid ◽  
M. Krysmann ◽  
P. Dallas ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
Carbon Dots ◽  
Charge Injection ◽  
Interesting Property ◽  
Electrogenerated Chemiluminescence ◽  
Electroluminescent Devices ◽  
Wet Chemistry ◽  
20 Nm ◽  
Carbon Based

ABSTRACTWe report an interesting property of carbon dots: they emit light under charge injection. We synthesized carbon dots in diameter about 20 nm using wet chemistry methods. The photoluminescence quantum efficiency of the carbon dots dissolved in water was about 11%. We observed strong electrogenerated chemiluminescence (ECL) from the sample. This observation of ECL from carbon dots indicates that they could be a good candidate material for carbon-based electroluminescent devices.

All-printed, low-cost, tunable sensing range strain sensors based on Ag nanodendrite conductive inks for wearable electronics

2019 ◽  
Vol 7 (4) ◽  
pp. 809-818 ◽  
Author(s):  
Bin Tian ◽  
Weijing Yao ◽  
Pan Zeng ◽  
Xuan Li ◽  
Huanjun Wang ◽  
...  
Keyword(s):  
Screen Printing ◽  
Low Cost ◽  
Strain Sensors ◽  
Wearable Electronics ◽  
Printing Technology ◽  
Conductive Inks ◽  
Sensing Range ◽  
Screen Printing Technology

Stretchable and wearable strain sensors based on Ag nanodendrites with high stretchability and sensitivity are fabricated by directly screen-printing technology.

scholarly journals Carbon-based supercapacitors for efficient energy storage

2017 ◽  
Vol 4 (3) ◽  
pp. 453-489 ◽  
Author(s):  
Xuli Chen ◽  
Rajib Paul ◽  
Liming Dai
Keyword(s):  
High Performance ◽  
Carbon Nanomaterials ◽  
Electrode Materials ◽  
High Energy ◽  
High Energy Density ◽  
Energy Sources ◽  
Great Promise ◽  
Wearable Electronics ◽  
Efficient Energy ◽  
Carbon Based

AbstractThe advancement of modern electronic devices depends strongly on the highly efficient energy sources possessing high energy density and power density. In this regard, supercapacitors show great promise. Due to the unique hierarchical structure, excellent electrical and mechanical properties, and high specific surface area, carbon nanomaterials (particularly, carbon nanotubes, graphene, mesoporous carbon and their hybrids) have been widely investigated as efficient electrode materials in supercapacitors. This review article summarizes progress in high-performance supercapacitors based on carbon nanomaterials with an emphasis on the design and fabrication of electrode structures and elucidation of charge-storage mechanisms. Recent developments on carbon-based flexible and stretchable supercapacitors for various potential applications, including integrated energy sources, self-powered sensors and wearable electronics, are also discussed.

Hopping conduction on conductive inks for wearable electronics

2013 ◽  
Vol 24 (6) ◽  
pp. 2091-2097 ◽  
Author(s):  
C. P. L. Rubinger ◽  
V. Junqueira ◽  
G. M. Ribeiro ◽  
R. M. Rubinger
Keyword(s):  
Hopping Conduction ◽  
Wearable Electronics ◽  
Conductive Inks

scholarly journals The Development of Highly Flexible Stretch Sensors for a Robotic Hand

Robotics ◽  
2018 ◽  
Vol 7 (3) ◽  
pp. 54 ◽  
Author(s):  
Harish Devaraj ◽  
Tim Giffney ◽  
Adeline Petit ◽  
Mahtab Assadian ◽  
Kean Aw
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Black ◽  
Angular Position ◽  
Gauge Factor ◽  
Robotic Hand ◽  
Wearable Electronics ◽  
Structural Morphology ◽  
Carbon Particles ◽  
Large Stretch ◽  
Carbon Based

Demand for highly compliant mechanical sensors for use in the fields of robotics and wearable electronics has been constantly rising in recent times. Carbon based materials, and especially, carbon nanotubes, have been widely studied as a candidate piezoresistive sensing medium in these devices due to their favorable structural morphology. In this paper three different carbon based materials, namely carbon black, graphene nano-platelets, and multi-walled carbon nanotubes, were utilized as large stretch sensors capable of measuring stretches over 250%. These stretch sensors can be used in robotic hands/arms to determine the angular position of joints. Analysis was also carried out to understand the effect of the morphologies of the carbon particles on the electromechanical response of the sensors. Sensors with gauge factors ranging from one to 1.75 for strain up to 200% were obtained. Among these sensors, the stretch sensors with carbon black/silicone composite were found to have the highest gauge factor while demonstrating acceptable hysteresis in most robotic hand applications. The highly flexible stretch sensors demonstrated in this work show high levels of compliance and conformance making them ideal candidates as sensors for soft robotics.

scholarly journals Cationic Cellulose Nanocrystals-Based Nanocomposite Hydrogels: Achieving 3D Printable Capacitive Sensors with High Transparency and Mechanical Strength

Polymers ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 688
Author(s):  
Po-Cheng Lai ◽  
Sheng-Sheng Yu
Keyword(s):  
3D Printing ◽  
Surface Chemistry ◽  
Mechanical Strength ◽  
Cellulose Nanocrystals ◽  
Soft Materials ◽  
Capacitive Sensors ◽  
Wearable Electronics ◽  
High Transparency ◽  
Physical Network ◽  
Nanocomposite Hydrogels

Hydrogel ionotronics are intriguing soft materials that have been applied in wearable electronics and artificial muscles. These applications often require the hydrogels to be tough, transparent, and 3D printable. Renewable materials like cellulose nanocrystals (CNCs) with tunable surface chemistry provide a means to prepare tough nanocomposite hydrogels. Here, we designed ink for 3D printable sensors with cationic cellulose nanocrystals (CCNCs) and zwitterionic hydrogels. CCNCs were first dispersed in an aqueous solution of monomers to prepare the ink with a reversible physical network. Subsequent photopolymerization and the introduction of Al3+ ion led to strong hydrogels with multiple physical cross-links. When compared to the hydrogels using conventional CNCs, CCNCs formed a stronger physical network in water that greatly reduced the concentration of nanocrystals needed for reinforcing and 3D printing. In addition, the low concentration of nanofillers enhanced the transparency of the hydrogels for wearable electronics. We then assembled the CCNC-reinforced nanocomposite hydrogels with stretchable dielectrics into capacitive sensors for the monitoring of various human activities. 3D printing further enabled a facile design of tactile sensors with enhanced sensitivity. By harnessing the surface chemistry of the nanocrystals, our nanocomposite hydrogels simultaneously achieved good mechanical strength, high transparency, and 3D printability.

SEM Cold Stage Techniques for the Observation of Vegetative and Floral Apices of Oat (Avena sativa L.) Plants

1977 ◽  
Vol 35 ◽  
pp. 590-591
Author(s):  
B. K. Kirchoff ◽  
L.F. Allard ◽  
W.C. Bigelow
Keyword(s):  
Critical Point ◽  
Avena Sativa ◽  
Substantial Improvement ◽  
Fresh Tissue ◽  
Cold Stage ◽  
Critical Point Drying ◽  
Almost All ◽  
Cell Collapse ◽  
Conductive Paint ◽  
Carbon Based

In attempting to use the SEM to investigate the transition from the vegetative to the floral state in oat (Avena sativa L.) it was discovered that the procedures of fixation and critical point drying (CPD), and fresh tissue examination of the specimens gave unsatisfactory results. In most cases, by using these techniques, cells of the tissue were collapsed or otherwise visibly distorted. Figure 1 shows the results of fixation with 4.5% formaldehyde-gluteraldehyde followed by CPD. Almost all cellular detail has been obscured by the resulting shrinkage distortions. The larger cracks seen on the left of the picture may be due to dissection damage, rather than CPD. The results of observation of fresh tissue are seen in Fig. 2. Although there is a substantial improvement over CPD, some cell collapse still occurs.Due to these difficulties, it was decided to experiment with cold stage techniques. The specimens to be observed were dissected out and attached to the sample stub using a carbon based conductive paint in acetone.

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