scholarly journals Control method of applied voltage for fabricating micro-pattern using near-field electrohydrodynamic direct-writing technology

AIP Advances ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 115120
Author(s):  
Ting Wu ◽  
Libing Zhang ◽  
Haijun Song
Keyword(s):  
Applied Voltage ◽  
Control Method ◽  
Near Field ◽  
Direct Writing ◽  
Micro Pattern ◽  
Writing Technology

scholarly journals Effect of Process Parameters on Organic Micro Patterns Fabricated on a Flexible Substrate Using the Near-Field Electrohydrodynamic Direct-Writing Method

Micromachines ◽  
2019 ◽  
Vol 10 (5) ◽  
pp. 287 ◽  
Author(s):  
Jianzhou Chen ◽  
Ting Wu ◽  
Libing Zhang ◽  
Peng Li ◽  
Xiaowei Feng ◽  
...  
Keyword(s):  
Process Parameters ◽  
Flow Rate ◽  
Applied Voltage ◽  
Flexible Substrate ◽  
Near Field ◽  
Injection System ◽  
Direct Writing ◽  
Micro Pattern ◽  
Mixed Material ◽  
Micro Patterns

A micro pattern is a key component of various functional devices. In the present study, using the poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) mixed material as the direct-writing solution and photographic paper as the flexible insulating substrate, the organic micro patterns of various shapes, such as the curve of the second-order self-similar structure, the helical curve, and the wave curve, were fabricated on the flexible insulating substrate by using the near-field electrohydrodynamic direct-writing method. The effects of process parameters, such as the applied voltage, direct-writing height, flow rate of the injection system, and moving velocity of the substrate, on the width and the conductivity of the organic micro patterns were studied in the near-field electrohydrodynamic direct-writing process. The results show that the width of an organic micro pattern increases with the increase of the applied voltage of the high-voltage power supplier and the flow rate of the injection system under the condition where the three other process parameters remained constant, respectively, while the width of an organic micro pattern decreases with the increase of the direct-writing height and the moving velocity of the flexible substrate, respectively. The fabricated organic microcircuit patterns of the natural drying in air at room temperature were tested by a thin film thermoelectric tester at a detection temperature. The results show that the conductivity of a fabricated organic micro pattern decreases with the increase of the electric field intensity, while the effect of moving velocity and the flow rate on the conductivity is small under the condition where the three other process parameters remained constant.

scholarly journals Optical Sensitivity of Waveguides Inscribed in Nanoporous Silicate Framework

Nanomaterials ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 123
Author(s):  
Zhong Lijing ◽  
Roman A. Zakoldaev ◽  
Maksim M. Sergeev ◽  
Andrey B. Petrov ◽  
Vadim P. Veiko ◽  
...  
Keyword(s):  
Refractive Index ◽  
Near Field ◽  
Experimental Studies ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Direct Writing ◽  
Sensor Applications ◽  
Refractive Index Contrast ◽  
Optical Sensitivity ◽  
Index Contrast

Laser direct writing technique in glass is a powerful tool for various waveguides’ fabrication that highly develop the element base for designing photonic devices. We apply this technique to fabricate waveguides in porous glass (PG). Nanoporous optical materials for the inscription can elevate the sensing ability of such waveguides to higher standards. The waveguides were fabricated by a single-scan approach with femtosecond laser pulses in the densification mode, which resulted in the formation of a core and cladding. Experimental studies revealed three types of waveguides and quantified the refractive index contrast (up to Δn = 1.2·10−2) accompanied with ~1.2 dB/cm insertion losses. The waveguides demonstrated the sensitivity to small objects captured by the nanoporous framework. We noticed that the deposited ethanol molecules (3 µL) on the PG surface influence the waveguide optical properties indicating the penetration of the molecule to its cladding. Continuous monitoring of the output near field intensity distribution allowed us to determine the response time (6 s) of the waveguide buried at 400 µm below the glass surface. We found that the minimum distinguishable change of the refractive index contrast is 2 × 10−4. The results obtained pave the way to consider the waveguides inscribed into PG as primary transducers for sensor applications.

Direct Writing on Paper Substrate to Prepare Silver Electrode Structures for Flexible Sensors

2021 ◽  
Vol 21 (12) ◽  
pp. 6048-6053
Author(s):  
Qi Wang ◽  
Mingwei Li ◽  
Yao Xie ◽  
Yun Ou ◽  
Weiping Zhou
Keyword(s):  
Low Cost ◽  
Rapid Development ◽  
Silver Electrode ◽  
Silver Nanostructures ◽  
Direct Writing ◽  
Paper Substrate ◽  
Electronic Products ◽  
Glass Substrates ◽  
Different Temperatures ◽  
Writing Technology

With the rapid development of the electronics industry, electronic products based on silicon and glass substrates electronic products will gradually be unable to meet the rising demand. Flexibility, environmental protection, and low costs are important for the development of electronic products. In this study, an efficient and low-cost method for preparing silver electrode structures by direct writing on paper has been demonstrated. Based on this method, a flexible paper-based sensor was prepared. The liquid printing ink used mainly comprises a precursor liquid without pre-prepared nanomaterials. The precursor liquid is transparent with good fluidity. Simple direct writing technology was used to write on the paper substrate using the precursor ink. When the direct-writing paper substrate was subsequently heated, silver nanostructures precipitated from the precursor liquid ink onto the paper substrate. The effect of different temperatures on the formation of the silver nanostructures and the influence of different direct writing processes on the structures were studied. Finally, a paper-based flexible sensor was prepared for finger-bending signal detection. The method is simple to operate and low in cost and can be used for the preparation of environment-friendly paper-based devices.

Development of single-layer positive resist process for electron beam direct writing technology

1995 ◽  
Vol 78 (8) ◽  
pp. 81-91 ◽  
Author(s):  
Hidenori Yamaguchi ◽  
Toshio Sakamizu ◽  
Fumio Murai ◽  
Hiroshi Shiraishi ◽  
Hajime Hayakawa ◽  
...  
Keyword(s):  
Electron Beam ◽  
Single Layer ◽  
Direct Writing ◽  
Writing Technology ◽  
Positive Resist

scholarly journals Processing variables of direct-write, near-field electrospinning impact size and morphology of gelatin fibers

2020 ◽  
Author(s):  
Zachary G. Davis ◽  
Aasim F. Hussain ◽  
Matthew B. Fisher
Keyword(s):  
Acetic Acid ◽  
Acid Concentration ◽  
Near Field ◽  
Fiber Formation ◽  
Direct Write ◽  
Acetic Acid Concentration ◽  
Direct Writing ◽  
Fiber Morphology ◽  
Gelatin Concentration ◽  
The Impact

AbstractSeveral biofabrication methods are being investigated to produce scaffolds that can replicate the structure of the extracellular matrix. Direct-write, near-field electrospinning of polymer solutions and melts is one such method which combines fine fiber formation with computer-guided control. Research with such systems has focused primarily on synthetic polymers. To better understand the behavior of biopolymers used for direct-writing, this project investigated changes in fiber morphology, size, and variability caused by varying gelatin and acetic acid concentration, as well as, process parameters such as needle gauge and height, stage speed, and interfiber spacing. Increasing gelatin concentration at a constant acetic acid concentration improved fiber morphology from large, planar structures to small, linear fibers with a median of 2.3 µm. Further varying the acetic acid concentration at a constant gelatin concentration did not alter fiber morphology and diameter throughout the range tested. Varying needle gauge and height further improved the median fiber diameter to below 2 µm and variability of the first and third quartiles to within +/-1 µm of the median for the optimal solution combination of gelatin and acetic acid concentrations. Additional adjustment of stage speed did not impact the fiber morphology or diameter. Repeatable interfiber spacings down to 250 µm were shown to be capable with the system. In summary, this study illustrates the optimization of processing parameters for direct-writing of gelatin to produce fibers on the scale of collagen fibers. This system is thus capable of replicating the fibrous structure of musculoskeletal tissues with biologically relevant materials which will provide a durable platform for the analysis of single cell-fiber interactions to help better understand the impact scaffold materials and dimensions have on cell behavior.

Submicrometer Electron-Beam Direct Writing Technology for 1-Mbit DRAM Fabrication

1985 ◽  
Vol 20 (1) ◽  
pp. 88-93 ◽  
Author(s):  
T. Matsuda ◽  
K. Miyoshi ◽  
R. Yamaguchi ◽  
S. Moriya ◽  
T. Hosoya ◽  
...  
Keyword(s):  
Electron Beam ◽  
Direct Writing ◽  
Writing Technology

Polarization improvement of CsPbClBr2 quantum dot film by laser direct writing technology

2021 ◽  
Vol 46 (4) ◽  
pp. 777
Author(s):  
Teng Ma ◽  
Yi Wei ◽  
Jinning Hu ◽  
Jun Chen ◽  
Weili Shen ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Direct Writing ◽  
Laser Direct Writing ◽  
Writing Technology

Laser direct writing technology for printing mesh on convex surface

2016 ◽  
Vol 45 (1) ◽  
pp. 0120002
Author(s):  
胡内彬 Hu Neibin ◽  
白 剑 Bai Jian ◽  
墨洪磊 Mo Honglei ◽  
朱蓓蓓 Zhu Beibei ◽  
兰 洁 Lan Jie ◽  
...  
Keyword(s):  
Convex Surface ◽  
Direct Writing ◽  
Laser Direct Writing ◽  
Writing Technology

scholarly journals An Overshoot-Constrained Fast Setpoint Control for Nanopositioning Systems with Switched Controllers

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
Zhizheng Wu ◽  
Tengfei Yue ◽  
Xinxiang Jiang ◽  
Ning Cao ◽  
Feng Li ◽  
...  
Keyword(s):  
Pid Controller ◽  
Closed Loop ◽  
Control Method ◽  
Near Field ◽  
Experimental System ◽  
Matrix Inequalities ◽  
Closed Loop System ◽  
Synthesis Algorithm ◽  
Key Technology ◽  
Near Field Optics

Nanopositioning control as the key technology has been applied in many fields such as near-field optics, biomedical engineering, and nanomanipulation, where it is required to possess high positioning accuracy, reliability, and speed. In this paper, a switched PID controller-based fast setpoint control method is proposed for nanopositioning systems. In order to improve the setpoint speed of the nanopositioning system without a large overshoot, a switched controller consisting of the approach mode and smooth mode is synthesized. The overshoot constraint of the resulting switched closed-loop system is investigated within a set of bilinear matrix inequalities, based on which the search of the controller parameters can be further processed by solving the properly formulated synthesis algorithm. The proposed control method is evaluated in a nanopositioning experimental system driven by a PZT actuator, and the experimental results demonstrate the effectiveness of the switched PID controller for the fast setpoint approaching operation.

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