scholarly journals Flexible, textronic temperature sensors, based on carbon nanostructures

2014 ◽  
Vol 62 (4) ◽  
pp. 759-763 ◽  
Author(s):  
S. Walczak ◽  
M. Sibiński
Keyword(s):  
Carbon Nanostructures ◽  
Screen Printing ◽  
Large Scale ◽  
Low Cost ◽  
Temperature Sensors ◽  
Wearable Electronics ◽  
Temperature Coefficient Of Resistance ◽  
Electronic Products ◽  
Screen Printing Method ◽  
Consumer Electronic

Abstract The paper presents a comparative analysis of two types of flexible temperature sensors, made of carbon-based nanostructures composites. These sensors were fabricated by a low-cost screen-printing method, which qualifies them to large scale, portable consumer electronic products. Results of examined measurements show the possibility of application for thick film devices, especially dedicated to wearable electronics, also known as a textronics. Apart from general characterisation, the influence of technological processes on specific sensor parameters were examined, particulary the value of the temperature coefficient of resistance (TCR) and its stability during the device bending.

Highly responsive screen-printed asymmetric pressure sensor based on laser-induced graphene

2021 ◽  
Author(s):  
Jiang Zhao ◽  
Jiahao Gui ◽  
Jinsong Luo ◽  
Jing Gao ◽  
Caidong Zheng ◽  
...  
Keyword(s):  
Pressure Sensor ◽  
Screen Printing ◽  
Large Scale ◽  
Low Cost ◽  
Pressure Sensors ◽  
High Sensitivity ◽  
Wearable Electronics ◽  
Integrated Sensor ◽  
Patterned Electrodes ◽  
Screen Printed

Abstract Graphene-based pressure sensors have received extensive attention in wearable devices. However, reliable, low-cost, and large-scale preparation of structurally stable graphene electrodes for flexible pressure sensors is still a challenge. Herein, for the first time, laser-induced graphene (LIG) powder are prepared into screen printing ink, and shape-controllable LIG patterned electrodes can be obtained on various substrates using a facile screen printing process, and a novel asymmetric pressure sensor composed of the resulting screen-printed LIG electrodes has been developed. Benefit from the 3D porous structure of LIG, the as-prepared flexible LIG screen-printed asymmetric pressure sensor has super sensing properties with a high sensitivity of 1.86 kPa−1, low detection limit of about 3.4 Pa, short response time, and long cycle durability. Such excellent sensing performances give our flexible asymmetric LIG screen-printed pressure sensor the ability to realize real-time detection of tiny body physiological movements (such as wrist pulse and pronunciation action). Besides, the integrated sensor array has a multi-touch function. This work could stimulate an appropriate approach to designing shape-controllable LIG screen-printed patterned electrodes on various flexible substrates to adapt the specific needs of fulfilling compatibility and modular integration for potential application prospects in wearable electronics.

scholarly journals Process Design Kit and Design Automation for Flexible Hybrid Electronics

2019 ◽  
Vol 16 (3) ◽  
pp. 117-123
Author(s):  
Tsung-Ching Huang ◽  
Ting Lei ◽  
Leilai Shao ◽  
Sridhar Sivapurapu ◽  
Madhavan Swaminathan ◽  
...  
Keyword(s):  
Process Design ◽  
Design Automation ◽  
High Performance ◽  
Large Scale ◽  
Low Cost ◽  
Thin Film Transistor ◽  
Solution Process ◽  
Oxide Semiconductor ◽  
Wearable Electronics ◽  
Wide Range

Abstract High-performance low-cost flexible hybrid electronics (FHE) are desirable for applications such as internet of things and wearable electronics. Carbon nanotube (CNT) thin-film transistor (TFT) is a promising candidate for high-performance FHE because of its high carrier mobility, superior mechanical flexibility, and material compatibility with low-cost printing and solution processes. Flexible sensors and peripheral CNT-TFT circuits, such as decoders, drivers, and sense amplifiers, can be printed and hybrid-integrated with thinned (<50 μm) silicon chips on soft, thin, and flexible substrates for a wide range of applications, from flexible displays to wearable medical devices. Here, we report (1) a process design kit (PDK) to enable FHE design automation for large-scale FHE circuits and (2) solution process-proven intellectual property blocks for TFT circuits design, including Pseudo-Complementary Metal-Oxide-Semiconductor (Pseudo-CMOS) flexible digital logic and analog amplifiers. The FHE-PDK is fully compatible with popular silicon design tools for design and simulation of hybrid-integrated flexible circuits.

scholarly journals A novel low-cost, high-precision sea temperature sensor for coral reef monitoring

2020 ◽  
Vol 96 (1) ◽  
pp. 97-110
Author(s):  
James Hendee ◽  
Natchanon Amornthammarong ◽  
Lewis Gramer ◽  
Andrea Gomez
Keyword(s):  
Coral Reef ◽  
High Precision ◽  
Temperature Sensor ◽  
Large Scale ◽  
Low Cost ◽  
Global Scale ◽  
Temperature Sensors ◽  
Sea Temperature ◽  
Temperature Regimes ◽  
Reef Monitoring

The role of elevated sea temperatures in coral bleaching has been well documented. Many of the sea temperature records utilized for purposes of widespread, multi-species bleaching predictions in recent publications have been acquired through satellite remote sensing. Satellites estimate sea temperatures at only a narrow range of depths near the surface of the ocean and may therefore not adequately represent the true temperatures endured by the world's coral ecosystems. To better characterize sea temperature regimes that coral reef ecosystems experience, as well as better define the individual thresholds for each species that bleaches, in situ sea temperature sensors are required. Commercial sensors are expensive in large quantities, however, reducing the capacity to conduct large- scale research programs to elucidate the range of significant scales of temperature variability. At the National Oceanic and Atmospheric Administration's (NOAA) Atlantic Oceanographic and Meteorological Laboratory (AOML), we designed a low-cost (roughly US$9 in parts) and high- precision sea temperature sensor that uses an Arduino microprocessor board and a high accuracy thermistor. This new temperature sensor autonomously records temperatures onto a memory chip and provides better accuracy (+0.05 °C) than a comparable commercial sensor (+0.2 °C). Moreover, it is not difficult to build; anyone who knows how to solder can build the temperature sensor. In March 2019, students at middle and high schools in Broward County, Florida, built close to 60 temperature sensors. During 2019, these sensors will be deployed by Reef Check, a global-scale coral reef monitoring organization, as well as by other programs to determine worldwide sea temperature regimes through the Opuhala Project (https://www. coral. noaa. gov/opuhala). This paper chronicles results from the initial proof-of-concept deployments for these AOML-designed sensors.

scholarly journals High-Sensitivity Flexible Pressure Sensor-Based 3D CNTs Sponge for Human–Computer Interaction

Polymers ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 3465
Author(s):  
Jianli Cui ◽  
Xueli Nan ◽  
Guirong Shao ◽  
Huixia Sun
Keyword(s):  
Pressure Sensor ◽  
High Performance ◽  
Large Scale ◽  
Low Cost ◽  
Pressure Sensors ◽  
Chemical Vapor ◽  
High Sensitivity ◽  
Wearable Electronics ◽  
Wide Range ◽  
Flexible Pressure Sensors

Researchers are showing an increasing interest in high-performance flexible pressure sensors owing to their potential uses in wearable electronics, bionic skin, and human–machine interactions, etc. However, the vast majority of these flexible pressure sensors require extensive nano-architectural design, which both complicates their manufacturing and is time-consuming. Thus, a low-cost technology which can be applied on a large scale is highly desirable for the manufacture of flexible pressure-sensitive materials that have a high sensitivity over a wide range of pressures. This work is based on the use of a three-dimensional elastic porous carbon nanotubes (CNTs) sponge as the conductive layer to fabricate a novel flexible piezoresistive sensor. The synthesis of a CNTs sponge was achieved by chemical vapor deposition, the basic underlying principle governing the sensing behavior of the CNTs sponge-based pressure sensor and was illustrated by employing in situ scanning electron microscopy. The CNTs sponge-based sensor has a quick response time of ~105 ms, a high sensitivity extending across a broad pressure range (less than 10 kPa for 809 kPa−1) and possesses an outstanding permanence over 4,000 cycles. Furthermore, a 16-pixel wireless sensor system was designed and a series of applications have been demonstrated. Its potential applications in the visualizing pressure distribution and an example of human–machine communication were also demonstrated.

scholarly journals Low-Cost, Disposable, Flexible and Highly Reproducible Screen Printed SERS Substrates for the Detection of Various Chemicals

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Wei Wu ◽  
Li Liu ◽  
Zhigao Dai ◽  
Juhua Liu ◽  
Shuanglei Yang ◽  
...  
Keyword(s):  
Screen Printing ◽  
Large Scale ◽  
Low Cost ◽  
Large Area ◽  
Sers Substrates ◽  
Sensing Applications ◽  
Relative Standard ◽  
Sers Detection ◽  
On Line ◽  
Liquid Milk

Abstract Ideal SERS substrates for sensing applications should exhibit strong signal enhancement, generate a reproducible and uniform response and should be able to fabricate in large-scale and low-cost. Herein, we demonstrate low-cost, highly sensitive, disposable and reproducible SERS substrates by means of screen printing Ag nanoparticles (NPs) on a plastic PET (Polyethylene terephthalate) substrates. While there are many complex methods for the fabrication of SERS substrates, screen printing is suitable for large-area fabrication and overcomes the uneven radial distribution. Using as-printed Ag substrates as the SERS platform, detection of various commonly known chemicals have been done. The SERS detection limit of Rhodamine 6G (R6G) is higher than the concentration of 1 × 10−10 M. The relative standard deviation (RSD) value for 784 points on the detection of R6G and Malachite green (MG) is less than 20% revealing a homogeneous SERS distribution and high reproducibility. Moreover, melamine (MA) is detected in fresh liquid-milk without additional pretreatment, which may accelerate the application of rapid on-line detection of MA in liquid milk. Our screen printing method highlights the use of large-scale printing strategies for the fabrication of well-defined functional nanostructures with applications well beyond the field of SERS sensing.

scholarly journals Fabrication of Screen Printing-Based AgNWs Flexible Transparent Conductive Film with High Stability

Micromachines ◽  
2020 ◽  
Vol 11 (12) ◽  
pp. 1027
Author(s):  
Jianjun Yang ◽  
Wei Zeng ◽  
Yaxin Li ◽  
Zichuan Yi ◽  
Guofu Zhou
Keyword(s):  
Screen Printing ◽  
High Stability ◽  
Large Scale ◽  
Silver Nanowires ◽  
Low Cost ◽  
Optical Microscope ◽  
Light Transmittance ◽  
Large Area ◽  
Transparent Substrate ◽  
Conductive Thin Films

Flexible transparent conductive thin films (TCFs) prepared from Silver nanowires (AgNWs) have attractive features of low cost, flexibility, and solution-processed, but the usual manufacturing methods could still be hard to be scaled up. In addition, large-scale/large-area fabrication process with industrialized potential is strongly needed. In this paper, the flexible TCFs with high stability are obtained via using screen printing method to print the AgNWs inks on a flexible and transparent substrate. The micro-structure of the AgNWs patterns is investigated by optical microscope and scanning electron microscope. Furthermore, the sheet resistance, light transmittance, and film thickness of the AgNWs patterns prepared under different conditions are characterized to explore the influence of different factors on its optical and electrical properties.

scholarly journals Design and Fabrication of Temperature Sensor for Weather Monitoring System using MEMS Technology

2018 ◽  
Vol 34 (5) ◽  
pp. 2510-2516
Author(s):  
Veeramani P. ◽  
Vimala Juliet A. ◽  
Sam Jebakumar J. ◽  
Jagadish R
Keyword(s):  
Monitoring System ◽  
Temperature Sensor ◽  
Low Cost ◽  
High Sensitivity ◽  
Micro Electro Mechanical System ◽  
Temperature Sensors ◽  
High Melting ◽  
Temperature Coefficient Of Resistance ◽  
Mems Technology ◽  
High Degree

In this paper, Micro Electro Mechanical System (MEMS) based temperature sensor is designed and fabricated for weather monitoring system at troposphere level. In this design we have used meander shape, because it is easy to vary the length. We have optimized the length in this design. Due to certain advantages like low cost, easily available, high melting and boiling point, molybdenum material is used for fabrication of this design. The four meander type temperature sensors are designed with various dimensions of sizes in 6.7mm×4mm, 9.5mm×4mm, 5.2mm×4mm, 6.5mm×4mm. The Temperature Coefficient of Resistance (TCR) values for four various sensors mentioned above are 3.4 ×10-4 C-1, 3.7×10-4 C-1, 7.0×10-4 C-1, 7.5×10-4 C-1. For radiosonde applications the sensor must have high sensitivity, high degree of accuracy, good linearity and with better TCR values. The experimental results are better for dimension 6.7mm ×4mm for all characteristics mentioned above. The practical results are compared with the theoretical values.

A simple paper-based analytical device using UV resin screen-printing for the determination of ammonium in soil

2020 ◽  
Vol 12 (38) ◽  
pp. 4649-4656
Author(s):  
Thinikan Thongkam ◽  
Ratana Rungsirisakun ◽  
Khuanjit Hemavibool
Keyword(s):  
Screen Printing ◽  
Low Cost ◽  
Screen Printing Method ◽  
Soil P ◽  
Uv Resin ◽  
Printing Method ◽  
Analytical Device

A convenient and low cost paper-based analytical device (PAD) was developed using an inexpensive UV resin with a screen-printing method for measuring ammonium in soil.

The application of carbon black and printing ink technology in molded interconnect devices

2014 ◽  
Vol 34 (5) ◽  
pp. 395-403 ◽  
Author(s):  
Ren-Hao Liu ◽  
Wen-Bin Young
Keyword(s):  
Electrical Conductivity ◽  
Carbon Black ◽  
Iron Powder ◽  
Screen Printing ◽  
Low Cost ◽  
Screen Printing Method ◽  
Printing Ink ◽  
Molded Interconnect Devices ◽  
Silver Composite ◽  
Printing Method

Abstract In this article, the processing of molded interconnect devices (MIDs) was studied via in-mold decoration (IMD) molding technology. A screen printing process using carbon black and printing ink was proposed in the study. For comparison, various conductivity materials such as copper powder, iron powder, carbon black and silver composite were studied with the screen printing method. The results show that there is no electrical conductivity for the ink containing copper or iron powder up to 90% concentration. The low cost carbon black with printing ink was shown to be successful for the IMD process.

scholarly journals Large-Scale Synthesis of Semiconducting Cu(In,Ga)Se2 Nanoparticles for Screen Printing Application

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1148
Author(s):  
Bruna F. Gonçalves ◽  
Alec P. LaGrow ◽  
Sergey Pyrlin ◽  
Bryan Owens-Baird ◽  
Gabriela Botelho ◽  
...  
Keyword(s):  
Thin Film ◽  
Screen Printing ◽  
Large Scale ◽  
Near Infrared ◽  
Low Cost ◽  
Thin Film Deposition ◽  
Hexagonal Structure ◽  
Film Deposition ◽  
Large Scale Synthesis ◽  
Deposition Processes

During the last few decades, the interest over chalcopyrite and related photovoltaics has been growing due the outstanding structural and electrical properties of the thin-film Cu(In,Ga)Se2 photoabsorber. More recently, thin film deposition through solution processing has gained increasing attention from the industry, due to the potential low-cost and high-throughput production. To this end, the elimination of the selenization procedure in the synthesis of Cu(In,Ga)Se2 nanoparticles with following dispersion into ink formulations for printing/coating deposition processes are of high relevance. However, most of the reported syntheses procedures give access to tetragonal chalcopyrite Cu(In,Ga)Se2 nanoparticles, whereas methods to obtain other structures are scarce. Herein, we report a large-scale synthesis of high-quality Cu(In,Ga)Se2 nanoparticles with wurtzite hexagonal structure, with sizes of 10–70 nm, wide absorption in visible to near-infrared regions, and [Cu]/[In + Ga] ≈ 0.8 and [Ga]/[Ga + In] ≈ 0.3 metal ratios. The inclusion of the synthesized NPs into a water-based ink formulation for screen printing deposition results in thin films with homogenous thickness of ≈4.5 µm, paving the way towards environmentally friendly roll-to-roll production of photovoltaic systems.

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