Study of self-actuated screen-printed PZT-cantilevers

2011 ◽  
Vol 2011 (CICMT) ◽  
pp. 000105-000110
Author(s):  
Riadh LAKHMI ◽  
Christophe CASTILLE ◽  
Hélène DEBEDA ◽  
Mario MAGLIONE ◽  
Claude LUCAT
Keyword(s):  
Screen Printing ◽  
Sintering Temperature ◽  
Sacrificial Layer ◽  
Longitudinal Vibration ◽  
Ferroelectric Ceramics ◽  
Mechanical Pressure ◽  
Bending Mode ◽  
Resonance Frequencies ◽  
Cantilever Structure ◽  
Screen Printed

Usually, resonating cantilevers come from silicon technology and are generally activated with pure bending mode. In this work, we suggest to combine high sensitive cantilever structure with full self-actuated piezoelectric thick-film for high electrical-mechanical coupling. This cantilever is realized through the screen-printing deposition associated with a sacrificial layer. The beam part of the cantilever is composed of a PZT layer between two gold electrodes. Optimum performances of ferroelectric ceramics strongly rely on their composition and microstructure which imply generally the use of mechanical pressure and very high sintering temperature. These conditions are not compatible with the screen-printing process. As already shown with ceramics, addition of eutectic composition Li2CO3-CuO-Bi2O3 or borosilicate glass-frit to PZT powder and application of isostatic pressure, the sintering temperature of cantilevers may be decreased. Screen-printed piezoelectric samples are thus fired at 850°C, 900°C and 950°C. SEM analyses show the densification of the microstructure while increasing the sintering temperature. Electrical and mechanical characterizations are then achieved after poling the self-actuated cantilevers of different dimensions. In addition to the bending mode observed with a vibrometer, we pointed out other resonances related to the piezoelectric properties of the PZT cantilevers. Indeed, the three first orders of “in-plane” 31-longitudinal vibration mode and the first order “out-of-plane” 33-thickness resonance mode are revealed. The resonance frequencies deduced from analytical modeling are linked to the cantilever dimensions and thus confirm the experimental results. The piezoelectric parameters of PZT cantilevers approach those of ceramics. Quality factors of 300 to 400 associated to the unusual 31-longitudinal mode make self-actuated screen-printed PZT cantilevers good candidates for detection in liquid and gaseous media.

BENZENE GAS SENSOR BASED ON SCREEN-PRINTED PZT CANTILEVERS

2011 ◽  
Vol 2011 (CICMT) ◽  
pp. 000111-000116
Author(s):  
Hélène Debéda ◽  
Rosa M. Vázquez ◽  
Riadh Lakhmi ◽  
Francisco J. Arregui ◽  
Claude Lucat ◽  
...  
Keyword(s):  
Screen Printing ◽  
Room Temperature ◽  
Tin Dioxide ◽  
Sacrificial Layer ◽  
Longitudinal Vibration ◽  
Longitudinal Mode ◽  
High Sensitivity ◽  
Layer Technique ◽  
Longitudinal Vibration Mode ◽  
Ppm Level

Benzene gas detections at ppm level are performed at room temperature with a piezoelectric resonant type sensor. For this purpose, self-actuated PZT cantilevers made of multi-layered Au/PZT/Au beam (8×2×0.1 mm3) partially released from an alumina substrate, are fabricated thanks to the association of screen-printing and sacrificial layer technique. Then, PZT cantilevers are functionalized with different organic (polypyrrole and polyaniline) and inorganic (active carbon and tin dioxide) coatings. The high sensitivity (tens of hertz/ppm) is achieved by using the unusual 31's longitudinal vibration mode of the PZT cantilever, unlike classical modes like transversal bending resonating mode. With the second “in-plane” 31-longitudinal mode of the PZT beam, benzene detection at sub-ppm level is expected with the organic and inorganic sensitive coatings. These very interesting results already demonstrate the potentialities of coated PZT cantilevers for gas detection and can be extended to species detection in liquid media.

Enhanced thermoelectric properties of screen-printed Bi0.5Sb1.5Te3 and Bi2Te2.7Se0.3 thick films using a post annealing process with mechanical pressure

2017 ◽  
Vol 5 (33) ◽  
pp. 8559-8565 ◽  
Author(s):  
Hyeongdo Choi ◽  
Sun Jin Kim ◽  
Yongjun Kim ◽  
Ju Hyung We ◽  
Min-Wook Oh ◽  
...  
Keyword(s):  
Thermoelectric Properties ◽  
Screen Printing ◽  
Thick Films ◽  
Annealing Process ◽  
Mechanical Pressure ◽  
Printing Process ◽  
Post Annealing ◽  
P Type ◽  
Screen Printed

We report on a TE device composed of p-type Bi0.5Sb1.5Te3 and n-type Bi2Te2.7Se0.3 TE materials prepared using a screen-printing process.

scholarly journals Chitosan-based enzyme ink for screen-printed bioanodes

RSC Advances ◽  
2021 ◽  
Vol 11 (33) ◽  
pp. 20550-20556
Author(s):  
Isao Shitanda ◽  
Kanako Oda ◽  
Noya Loew ◽  
Hikari Watanabe ◽  
Masayuki Itagaki ◽  
...  
Keyword(s):  
Magnesium Oxide ◽  
Mesoporous Carbon ◽  
Screen Printing ◽  
Printing Process ◽  
One Step ◽  
Screen Printed

Bio-composite inks based on magnesium oxide (MgO)-templated mesoporous carbon (MgOC) and chitosan cross-linked with genipin for one-step screen-printing process.

Investigating flexible textile-based coils for wireless charging wearable electronics

2019 ◽  
Vol 50 (3) ◽  
pp. 333-345 ◽  
Author(s):  
Danmei Sun ◽  
Meixuan Chen ◽  
Symon Podilchak ◽  
Apostolos Georgiadis ◽  
Qassim S Abdullahi ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electrical Conductivity ◽  
Electromagnetic Field ◽  
Electric Field ◽  
Dimensional Stability ◽  
Screen Printing ◽  
Wearable Electronics ◽  
Wireless Charging ◽  
The Magnetic Field ◽  
Screen Printed

Smart and interactive textiles have been attracted great attention in recent years. This research explored three different techniques and processes in developing textile-based conductive coils that are able to embed in a garment layer. Coils made through embroidery and screen printing have good dimensional stability, although the resistance of screen printed coil is too high due to the low conductivity of the print ink. Laser cut coil provided the best electrical conductivity; however, the disadvantage of this method is that it is very difficult to keep the completed coil to the predetermined shape and dimension. The tested results show that an electromagnetic field has been generated between the textile-based conductive coil and an external coil that is directly powered by electricity. The magnetic field and electric field worked simultaneously to complete the wireless charging process.

Screen-printed graphene-based electrochemical sensors for a microfluidic device

2017 ◽  
Vol 9 (24) ◽  
pp. 3689-3695 ◽  
Author(s):  
C. Karuwan ◽  
A. Wisitsoraat ◽  
P. Chaisuwan ◽  
D. Nacapricha ◽  
A. Tuantranont
Keyword(s):  
Microfluidic Device ◽  
Screen Printing ◽  
Electrochemical Sensors ◽  
Amperometric Detection ◽  
New Method ◽  
Screen Printing Technique ◽  
Printing Technique ◽  
Electrochemical Electrodes ◽  
Screen Printed

This work presents a new method for mass fabrication of a new microfluidic device with integrated graphene-based electrochemical electrodes by the screen printing technique for in-channel amperometric detection.

scholarly journals Photoelectric Properties of Screen-Printed Al-Doped ZnO Films

2012 ◽  
Vol 49 (2) ◽  
pp. 51-56
Author(s):  
A. Ogurcovs ◽  
Vj. Gerbreders ◽  
E. Tamanis ◽  
S. Gerbreders ◽  
G. Liberts
Keyword(s):  
Screen Printing ◽  
Energy Use ◽  
Zno Films ◽  
Photovoltaic Devices ◽  
Photoelectric Properties ◽  
Linear Relationships ◽  
Screen Printing Technique ◽  
Printing Technique ◽  
Doped Zno ◽  
Screen Printed

Photoelectric Properties of Screen-Printed Al-Doped ZnO Films The potential of cheap semiconductor materials in the area of solar energy use is illustrated by the example of zinc oxide (pure and Al-doped in various concentrations). Under investigation was the electric conductivity and photoelectric properties of ZnO thin films. The samples were prepared using screen-printing technique. The results of measurements point to non-linear relationships between Al concentration, photosensitivity and electrical conductivity of thin ZnO films. Optimal Al concentration for practical use of ZnO in photovoltaic devices is found to be ~ 1%. The experimental methods, technologies and results described in the paper could be used for further investigations in this area.

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 Direct Determination of Dynamic Elastic Modulus and Poisson’s Ratio of Timoshenko Rods

Vibration ◽  
2019 ◽  
Vol 2 (1) ◽  
pp. 157-173 ◽  
Author(s):  
Guadalupe Leon ◽  
Hung-Liang Chen
Keyword(s):  
Exact Solution ◽  
Finite Element ◽  
Elastic Constants ◽  
Frequency Ratio ◽  
Poisson’S Ratio ◽  
Direct Determination ◽  
Poisson's Ratio ◽  
Torsional Mode ◽  
Bending Mode ◽  
Resonance Frequencies

In this paper, the exact solution of the Timoshenko circular beam vibration frequency equation under free-free boundary conditions was determined with an accurate shear shape factor. The exact solution was compared with a 3-D finite element calculation using the ABAQUS program, and the difference between the exact solution and the 3-D finite element method (FEM) was within 0.15% for both the transverse and torsional modes. Furthermore, relationships between the resonance frequencies and Poisson’s ratio were proposed that can directly determine the elastic constants. The frequency ratio between the 1st bending mode and the 1st torsional mode, or the frequency ratio between the 1st bending mode and the 2nd bending mode for any rod with a length-to-diameter ratio, L/D ≥ 2 can be directly estimated. The proposed equations were used to verify the elastic constants of a steel rod with less than 0.36% error percentage. The transverse and torsional frequencies of concrete, aluminum, and steel rods were tested. Results show that using the equations proposed in this study, the Young’s modulus and Poisson’s ratio of a rod can be determined from the measured frequency ratio quickly and efficiently.

Nanopaper-based screen-printed electrodes: a hybrid sensing bioplatform for dual opto-electrochemical sensing applications

Nanoscale ◽  
2020 ◽  
Vol 12 (35) ◽  
pp. 18409-18417
Author(s):  
Hadi Eynaki ◽  
Mohammad Ali Kiani ◽  
Hamed Golmohammadi
Keyword(s):  
Physicochemical Properties ◽  
Bacterial Cellulose ◽  
Screen Printing ◽  
Electrochemical Sensing ◽  
Screen Printed Electrode ◽  
Printing Technology ◽  
Sensing Applications ◽  
Cellulose Nanopaper ◽  
Screen Printing Technology ◽  
Screen Printed

Herein, we have developed a nanopaper-based screen-printed electrode as a hybrid opto-electrochemical sensing device by taking advantage of the unrivaled physicochemical properties of bacterial cellulose nanopaper in screen printing technology.

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