Tidak Diketahui Pusat Pengajian - Tesis

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    Development Of Lab On Printed Circuit Board Based Heavy Metal Detection
    (2023-03)
    Beh, Khi Khim
    Heavy metal contamination in water sources is a significant environmental problem that poses a threat to public health. Electrochemical detection is a promising approach to detecting and quantifying heavy metals in water, due to the high sensitivity and selectivity it provides. However, traditional working electrodes, such as glassy carbon and mercury, are not ideal for detecting heavy metals due to limitations such as low sensitivity and toxicity. To address these limitations, this study aimed to improve the design and fabrication complexity of electro-analytical sensors by implementing a conventional Printed Circuit Board (PCB) fabrication technique. The fabricated sensor has achieved miniaturization of 40% compared to existing electrochemical sensors. According to cyclic voltammetry (CV) measurements, the fabricated sensor can produce a reversible peak reaction with different scan rates between 100 mV/s to 10 mV/s achieving a peak current ratio of 1. The modified Graphene Oxide (GO) of 0.2 mg/ml on the working electrode was explored as a sensing material due to its high sensitivity and selectivity in detecting heavy metals such as lead and cadmium, with an improvement of 45% in the detection of these metals. The optimum conditions for the detection of lead and cadmium were determined with a 10-minute accumulation time, -0.4 v reduction potential, 7-minute reduction time, and pH 4.0 of 0.1 M HCL buffer solution.
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    Publication
    Multiband Cmos Power Amplifierwith Integrated High-Q Compact Inductor For Lora Application
    (2023-05)
    Arvind Singh Rawat
    In the wide development of the Internet of Things (IoT), Machine-to-Machine (M2M), and biomedical applications in research and standardization, the spectrum of sub-GHz has received fresh attention. Long-range (LoRa) devices use the sub-GHz frequency bands to operate. The size of the chip becomes bigger when designed to target low frequencies and it is mainly contributed by the inductors. In this research, a high-performance CMOS power amplifier (PA) with a novel custom shape, high Qfactor compact inductor (HQCI) is fabricated in 130 nm, 6-metal layers CMOS process.
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    Publication
    Piezoelectric Micro Ultrasonic Transducer (Pmut) With Fluidic Backing Layer As A Sensing Mechanism For Short Distance Underwater Microphone Application
    (2022-02)
    Ahmad, Khairul Azman
    Piezoelectric micro ultrasonic transducer (PMUT) is vital for underwater microphone (hydrophone) applications. Hydrophone is generally used for listening or receiving any acoustic signal in underwater. Several studies have documented that PMUT served as underwater hydrophone with low receiving sensitivity and narrow operation bandwidth. The received acoustic signals with low receiving sensitivity are not accurate due to interference by unwanted signal. Acoustic transducers with narrow bandwidth were effected low resolution for underwater acoustic imaging. Narrow bandwidth transducers were captured for certain frequency only and it were difficult to catch acoustic signal at a long range frequency. In imaging, it is important the transducers can receive the signal for a long range of frequencies. The objectives of this study to increase the low receiving sensitivity transducer in the range of 300 kHz to 800 kHz and widen the narrow frequency bandwidth underwater ultrasonic transducer. Subsequently objectives are a PMUT designed using d33 mode piezoelectric structure, flexural membrane and fluidic backing layer.