Organic Thin-film Transistors for pH Detection

2010 ◽  
Vol 1253 ◽  
Author(s):  
Monia Demelas ◽  
Alessandra Caboni ◽  
Massimo Barbaro ◽  
Annalisa Bonfiglio
Keyword(s):  
Ph Value ◽  
Chemical Species ◽  
Drain Current ◽  
Floating Gate ◽  
Organic Thin Film ◽  
Capacitively Coupled ◽  
Organic Transistor ◽  
Working Principle ◽  
Chemical Solutions ◽  
And Control

AbstractA novel, flexible and ductile organic field-effect transistor (OFET) able to detect pH changes in chemical solutions has been realized and successfully tested. With respect to other organic pH sensors, based on an ISFET-like structure, in our approach the organic transistor is completely separated from the sensing active area and its gate is left floating. The device is biased with a fourth electrode (control-gate) capacitively coupled to the floating-gate. The floating-gate is functionalized by deposition of a layer of thio-amines able to protonize proportionally to the pH value of the solution thus modulating the drain current. The structure does not need an Ag/AgCl counter-electrode since the control-gate is not in contact with the solution. Moreover, the sensing mechanism does not depend on the choice of the dielectric and semiconductor material since the working principle is based on charge separation in the metal induced by the electric field. This structure also simplifies the realization of the fluidics since all the contactable electrodes (drain, source and control-gate) are on the same side of the substrate. A differential measurement approach was adopted in order to get rid of device aging and process-related fluctuations. With the same structure, other chemical species may be detected provided that a proper functionalization procedure is adopted.

Modelling and Simulation Approach for Organic Thin-Film Transistors Using MATLAB Simulation

2015 ◽  
Vol 1107 ◽  
pp. 514-519
Author(s):  
Umar Faruk Shuib ◽  
Khairul Anuar Mohamad ◽  
Afishah Alias ◽  
Tamer A. Tabet ◽  
Bablu K. Gosh ◽  
...  
Keyword(s):  
Thin Film ◽  
Low Cost ◽  
Thin Film Transistor ◽  
Drain Current ◽  
Mobility Model ◽  
Channel Length ◽  
Analytical Models ◽  
Organic Thin Film ◽  
Organic Thin Film Transistor ◽  
Organic Transistor

As organic transistors are preparing to make improvements towards flexible and low cost electronics applications, the analytical models and simulation methods were demanded to predict the optimized performance and circuit design. In this paper, we investigated the analytical model of an organic transistor device and simulate the output and transfer characteristics of the device using MATLAB tools for different channel length (L) of the organic transistor. In the simulation, the Pool-Frenkel mobility model was used to represent the conductive channel of organic transistor. The different channel length has been simulated with the value of 50 μm, 10 μm and 5 μm. This research paper analyses the performance of organic thin film transistor (TFT) for top contact bottom gate device. From the simulation, drain current of organic transistor was increased as the channel length decreased. Other extraction value such sub-threshold and current on/off ratio is 0.41 V and 21.1 respectively. Thus, the simulation provides significant extraction of information about the behaviour of the organic thin film transistor.

The detection of polyamines by an extended gate-type organic transistor functionalized with a carboxylate attached 1,3,4-thiadiazole derivative

2021 ◽  
Author(s):  
Koichiro Asano ◽  
Yui Sasaki ◽  
Qi Zhou ◽  
Riho Mitobe ◽  
Wei Tang ◽  
...  
Keyword(s):  
Thin Film ◽  
Pattern Recognition ◽  
Thin Film Transistor ◽  
Organic Thin Film ◽  
Organic Thin Film Transistor ◽  
Gate Electrode ◽  
Organic Transistor ◽  
Thiadiazole Derivative

We herein report an extended gate-type organic thin-film transistor (OTFT)-based polyamine sensor and its application for pattern recognition. The extended-gate electrode was functionalized with a complex of copper(II) ions and...

The Application of the Amorphous Metal Transformers in Heavy Oil Electric Heating System

2014 ◽  
Vol 532 ◽  
pp. 191-195 ◽  
Author(s):  
Bao Jiang Sun ◽  
Lei Su ◽  
Chao Zhang
Keyword(s):  
Electric Heating ◽  
Heating System ◽  
Intermediate Frequency ◽  
Amorphous Metal ◽  
Technical Performance ◽  
Alloy Material ◽  
Working Principle ◽  
The Stability ◽  
And Control ◽  
Fast Rise

In order to solve the problem that the big loss of no-load and the fast rise of temperature when employ the conventional silicon steel metal transformer (SSMT) in the electric heating system, we choose the amorphous metal transformer (AMMT). In this paper, firstly, we give a brief introduction of the amorphous alloy material properties and compare the no-load characteristic of the AMMT with the SSMT. Secondly, the structure of intermediate frequency heating system working principle and control strategy are introduced. Finally, extensive experiments were conducted to validate the ideas. The experiments show that the AMMT not only improve the efficiency of transformer, solve the heating problem of transformer, but also improve the stability, security and other technical performance of the system, so it is worth recommending and promoting.

1/f Noise Behavior in Pentacene Organic Thin Film Transistors

1999 ◽  
Vol 598 ◽  
Author(s):  
P. V. Necliudov ◽  
D. J. Gundlach ◽  
T. N. Jackson ◽  
S. L. Rumyantsev ◽  
M. S. Shur
Keyword(s):  
Thin Film ◽  
Conducting Polymers ◽  
Thin Film Transistors ◽  
Low Frequency ◽  
Drain Current ◽  
Frequency Noise ◽  
Organic Thin Film ◽  
Amorphous Si ◽  
Parameter Values ◽  
Device Noise

ABSTRACTWe studied the low frequency noise in top-contact pentacene Thin Film Transistors (TFTs). The relative spectral noise density of the drain current fluctuations SI/I2 had a form of 1/f noise in the measured frequency range 1Hz - 3.5kHz.Our studies of the noise dependencies on the gate-source VGS and drain-source VDS voltages showed that the dependencies differed from those observed for conducting polymers and resembled those reported for crystalline Si n-MOSFETs.To compare the device noise level with those of other devices and materials, we extracted the Hooge parameter α. In order to calculate the total number of carriers we used a model simulating the device DC characteristics, similar to that for amorphous Si TFTs. The extracted Hooge parameter was 0.04. For an organic material this is an extremely small value, which is three orders of magnitude smaller that the Hooge parameter values reported for conducting polymers and only several times higher than the values for amorphous Si TFTs.

scholarly journals Formulation and Evaluation of Sunscreen Cream from Moringa oleifera and Turbinaria conoides

2021 ◽  
Vol 324 ◽  
pp. 05001
Author(s):  
Rini Yanuarti ◽  
Nurfitriyana Nurfitriyana ◽  
Muhammad Zuchryanto ◽  
Ginanjar Pratama ◽  
Aris Munandar ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Moringa Oleifera ◽  
Ph Value ◽  
Brown Seaweed ◽  
Sun Protection ◽  
Protection Factor ◽  
Turbinaria Conoides ◽  
Sun Protection Factor ◽  
And Control ◽  
Good Homogeneity

Research on the combination of natural ingredients from brown seaweed and Moringa, to be used as sunscreen has been nothing. Therefore, the objective of this study was to determine the best formulation from sunscreen evaluation. In this study, the ratio of Moringa oleifera and Turbinaria conoides was 1:1 (cream L), 2:1 (cream M), 1:2 (cream N), and control (no added both of natural ingredients) (cream K). The evaluation of sunscreen cream by Sun Protection Factor (SPF) activity, viscosity, pH, homogeneity, and microbial test. SPF values in this study from cream K, L, M, and N were 0.75±2.31, 17.80±0.97, 9.48±1.41, and 15.97±2.38, respectively. Viscosity values were 22,400 cPs for cream K; 32,400 cPs for cream L; 26,000 cPs for cream M; and 32,800 cPs for cream N. The pH value of sunscreen cream in cream K, L, M, N were 7.30±0.02, 6.51±0.02, 6.38±0.04, and 6.43±0.04, respectively. In all of the treatments of sunscreen cream, microbial tests are absent and have good homogeneity. The ratio of 1:1 (cream L) between M. oleifera and T. conoides has a good synergistic effect to ward off UV B light, therefore cream L is the best sunscreen cream in this study.

scholarly journals Systematic Evaluation of Arduino Open Source for Automation and Control of Chemical Processes

2020 ◽  
Vol 10 (2) ◽  
pp. 2258-2271
Keyword(s):  
Open Source ◽  
Chemical Process ◽  
Ph Value ◽  
Low Cost ◽  
Ph Sensor ◽  
Chemical Processes ◽  
Systematic Evaluation ◽  
Feedback Signal ◽  
Automation And Control ◽  
And Control

Inceptions for chemical process automation are presented in this study. A chemical process demonstrated by neutralization reaction was designed, built, and tested experimentally towards evaluating automation and control algorithms through the Arduino Mega platform. The main objective parameter in this work was selected to be the product pH value, which was evaluated based on several scenarios that targeted various changes in direct and indirect effects. Two main branched ideas were investigated in this study; the first was dealt with the application of Arduino board in the automation of chemical process; the second was dedicated to studying integration of Arduino board in controlling the targeted pH parameter in the product side. Upon examining different automation scenarios, an algorithm was developed to approach the product quality of specific pH and temperature efficiently. The automation algorithm was further developed by integrating the process dynamics and control concepts towards speeding up the pH set point's reach. To make this happen, the pump's speed was corrected and tuned based on the feedback signal from the pH sensor. Consequently, the setpoint was reached in shorter periods, attaining considerable savings in time (≈ 35%). Based on the study outcomes, it is believed that Arduino open source is a challenging and promising low-cost platform, proved useful for mimicking control and automation of chemical processes.

scholarly journals Simulation of reactive power regulation of DFIG

2021 ◽  
Vol 233 ◽  
pp. 01025
Author(s):  
Yingfeng Zhu ◽  
Xiaosu Xie ◽  
Dong Yang ◽  
Song Gao ◽  
Weichao Zhang ◽  
...  
Keyword(s):  
Wind Farm ◽  
Reactive Power ◽  
Control Method ◽  
Power Regulation ◽  
Working Principle ◽  
Power Limit ◽  
Doubly Fed ◽  
Grid Side ◽  
Grid Side Converter ◽  
And Control

Doubly fed induction generator (DFIG) wind power generation system is widely used in wind farm all over the world. Reactive power can be generated both in grid-side converter and generator-side converter of DFIG. In this paper, working principle and control method of DFIG are introduced, and the reactive power limit of DFIG is derived, finally reactive power regulation is simulated in Simulink.

scholarly journals Graphene Channel Liquid Container Field Effect Transistor as pH Sensor

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Xin Li ◽  
Junjie Shi ◽  
Junchao Pang ◽  
Weihua Liu ◽  
Hongzhong Liu ◽  
...  
Keyword(s):  
Field Effect ◽  
Field Effect Transistor ◽  
Ph Value ◽  
Ph Sensor ◽  
Drain Current ◽  
Fast Response ◽  
Monolayer Graphene ◽  
Ph Sensing ◽  
Order Of Magnitude ◽  
Effect Transistor

Graphene channel liquid container field effect transistor pH sensor with interdigital microtrench for liquid ion testing is presented. Growth morphology and pH sensing property of continuous few-layer graphene (FLG) and quasi-continuous monolayer graphene (MG) channels are compared. The experiment results show that the source-to-drain current of the graphene channel FET has a significant and fast response after adsorption of the measured molecule and ion at the room temperature; at the same time, the FLG response time is less than 4 s. The resolution of MG (0.01) on pH value is one order of magnitude higher than that of FLG (0.1). The reason is that with fewer defects, the MG is more likely to adsorb measured molecule and ion, and the molecules and ions can make the transport property change. The output sensitivities of MG are from 34.5% to 57.4% when the pH value is between 7 and 8, while sensitivity of FLG is 4.75% when thepH=7. The sensor fabrication combines traditional silicon technique and flexible electronic technology and provides an easy way to develop graphene-based electrolyte gas sensor or even biological sensors.

scholarly journals Design of Tracked Model Vehicle Measurement and Control System Based on VeriStand and Simulink

2018 ◽  
Vol 175 ◽  
pp. 03047
Author(s):  
Hao Chang ◽  
Dafang Wang ◽  
Hui Wei ◽  
Qi Zhang ◽  
GuangLi Dong
Keyword(s):  
Control System ◽  
Data Processing ◽  
Vehicle Control ◽  
Logic Model ◽  
Motor Speed ◽  
Control Logic ◽  
Measurement And Control System ◽  
Working Principle ◽  
And Control ◽  
Measurement And Control

This paper presents the composition and working principle of the hardware and software of the measurement and control system based on VeriStand and Simulink for a tracked model vehicle. The hardware of the system is composed of a CompactRIO controller and acquisition cards, torque/speed sensors and a gyroscope. The vehicle control logic model and data processing model are built in Matlab/Simulink. VeriStand is adopted to manage models and interact with people. The system can control motor speed on both sides of the vehicle and collect data such as sprocket torque and speed, vehicle attitude on real-time. At last, we test and verify the system can work successfully.

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