A5000746281- Gas Sensing Nanomaterials and Sensors
- Analytical Chemistry and Sensors
- Advanced Chemical Sensor Technologies
- Low-power high-performance VLSI design
- Sensor Technology and Measurement Systems
- VLSI and Analog Circuit Testing
- Electrical and Thermal Properties of Materials
- Advancements in Semiconductor Devices and Circuit Design
- Analog and Mixed-Signal Circuit Design
- Transition Metal Oxide Nanomaterials
- Semiconductor materials and devices
- Embedded Systems and FPGA Design
- Embedded Systems Design Techniques
- Polyamine Metabolism and Applications
- Acoustic Wave Resonator Technologies
- VLSI and FPGA Design Techniques
- Higher Education Learning Practices
- CCD and CMOS Imaging Sensors
- Water Quality Monitoring and Analysis
- Engineering Education and Curriculum Development
- Integrated Circuits and Semiconductor Failure Analysis
- Innovative Educational Techniques
- Electronic Packaging and Soldering Technologies
- Insect Pheromone Research and Control
- Microwave Engineering and Waveguides
Universiti Putra Malaysia
2009-2021
A gas sensor array was developed in a 10 × mm(2) space using Screen Printing and Pulse Laser Ablation Deposition (PLAD) techniques. Heater, electrode, an insulator interlayer were printed the screen printing method on alumina substrate, while tin oxide platinum films, as sensing catalyst layers, deposited electrode at room temperature PLAD method, respectively. To ablate SnO(2) Pt targets, depositions achieved by 1,064 nm Nd-YAG laser, with power of 0.7 J/s, different deposition times 2, 5...
This paper shows a correlation between surface effective porosity due to various sintering regimes and humidity sensitive electrical properties of the perovskite-based bulk type sensors, at room temperature. Furthermore, temperature transduction mechanism thick film sensors was studied in detail through electrochemical impedance spectroscopy (EIS) major transmissive components were detected by fitting Bode diagrams Nyquist complexes equivalent circuits. The microstructural, morphological...
A three-electrode system amperometric biosensor that consisted of screen-printed carbon paste working electrode (SPE), a commercial platinum rod counter vs Ag/AgCl reference was developed for rapid determination histamine in prawns. The designed from entrapping diamine oxidase (DAO) enzyme poly(2-hydroxyethyl methacrylate) (photoHEMA) film prepared via simple and one-step direct photocuring process on (SPE). photoHEMA exhibited water absorption 34.14% after four hours exposure to no leaching...
Microstructural, topology, inner morphology, and gas-sensitivity of mixed xWO(3)(1-x)Y(2)O(3) nanoparticles (x = 1, 0.95, 0.9, 0.85, 0.8) thick-film semiconductor gas sensors were studied. The surface topography morphological properties the powder sensing film characterized with X-ray diffraction (XRD), atomic force microscopy (AFM), transmission electron (TEM), scanning (SEM). Also, sensitivity printed films evaluated in presence methane (CH(4)) butane (C(4)H(10)) at up to 500 °C operating...
Investigation of the effect addition external positive ions on humidity-sensing properties perovskite-based oxides is an interesting topic. Humidity-sensitive barium strontium titanate nanocomposite films have been investigated in range 20–95% relative humidity (RH) at room temperature pure form (Ba0.5,Sr0.5)TiO3 (BST) and doped with 1, 3, 5 mol % magnesium oxide (MgO) nanoparticles. Microstructural characterization nanopowders was performed by X-ray diffraction (XRD), surface area pore size...
Porous (Zr0.5,Sr0.5)TiO3 and MgO (1, 3, 5 mol%) doped ZST nanocomposites have been developed investigated as humidity sensing elements. The surface area analyser FESEM data indicated that the perovskites are contained of macropores grain size about 77 to 87 nm. EFTEM proved reduction particle by addition dopant concentration. While pure shows BET 58 m2/g, samples exhibit 12 m2/g. Sensor with 3 mol% highest sensitivity four orders magnitude change in impedance within range 20% 95% RH.
The influence of Mg2+ doping (3 mol %) on structural and humidity sensing properties (Ba0.5,Sr0.5)TiO3 (BST) perovskite nanocomposite were studied in details. Microstructural revealed the particle size, surface area, average pore volume diminished for doped sample. For MgO BST sensor, film resistance total impedance are changed more than four orders magnitude 20–95% RH range, while sensor shows three change. 3 % sample with maximum hysteresis 6.1 RH% response/recovery time about 30/80 s...
This paper presents the electrical response of Multi-Walled Carbon Nanotube (MWCNT) towards presence gases at room temperature. The preparation MWCNT and experimental setup are also discussed. resistance elements is extracted from current-voltage measurements done results show that there a change in when sensing element exposed to either ammonia or carbon dioxide gas. Fast time recovery have been achieved.
Purpose The purpose of this paper is to describe a capacitive biosensor device consisting an enzyme electrode and simple detector which has been developed for histamine measurement. Design/methodology/approach In analysis, degradation through enzymatic reaction produces signal that monitored using equipped with “astable” multivibrator operation circuit (in capacitor‐resistor circuit). Findings Different frequency (f) readings have obtained glucose, alcohol in different concentration levels,...
This paper shows a correlation between surface effective porosity due to various sintering regimes and humidity sensitive electrical properties of the perovskite-based bulk type sensors. Furthermore, room temperature transduction mechanism thick film sensors was studied in details through electrochemical impedance spectroscopy (EIS) major transmissive components were detected by fitting equivalent circuits. The materials synthesized employing solid state reaction devices fabricated hydraulic...
In this paper an automated control system of thick film resistive heater for gas sensor applications has been designed using low cost technologies. To the desired temperature heater, a programmable voltage with 12 bits resolution applies which can be adjusted to appropriate temperature. The circuit consists ADC, DAC, microcontroller, and current buffer. This compensates dropt across resulted from ambient changes. particular, one microcontroller entire process is first time introduced drive...
A multi-layer thick film array sensor for gas sensing application including heater element, insulator layer, and interdigitated electrodes was designed fabricated on alumina substrate. Tin dioxide platinum nanopowder were used in the pellet form as active catalyst layers, respectively. Pulse laser ablation deposition (PLAD) technique to deposit sensitive layer onto electrode part of each sensor. Microstructural morphological properties surface determined. Sensors exposed wood smoke their...
Asynchronous processors are an attractive research field, since they offer many advantages over synchronous processors. Field-programmable gate arrays (FPGA), one of the dominant media at present for prototyping and implementing digital circuits, is used to construct 8-bit asynchronous RISC processor. The processor employs conceptual framework a Sutherland micropipeline, modular approach design circuits.
PIN diode microwave switch is designed using harmonica and fabricated MA 47110, realized on the microstrip. The called single pole double throw, SPDT, operating at 4 GHz.
The objective of this project is to develop a multiple-detector-system which consists two systems that are toxic gas detector system and breath alcohol detector. A microcontroller PIC 16F84, sensor (TGS822), an analog digital (A/D) TLC 549, LCD alphanumeric display were used. Both mounted on the same PCB board, DPDT switch used for purpose switching either from vice versa. tested using butane cigarette's lighter as well human's it worked satisfactory.