Kesan penuaan sesuhu terhadap sifat mikro kekerasan pempaterian Sn-Ag-Cu/CNT/Cu menggunakan pelekukan nano

Kesan penuaan terma terhadap sifat kekerasan sambungan pateri Sn-3.0Ag-0.5Cu (SAC305) yang ditambah dengan partikel karbon tiub nano (CNT) telah dikaji. Sifat kekerasan yang menggambarkan kekuatan sambungan pateri ditentukan melalui pendekatan pelekukan nano. Bahan pateri SAC ditambah dengan 0.03% kandungan berat CNT untuk menghasilkan bahan pes pateri SAC-CNT. Pes pateri yang telah dicetak di atas papan litar bercetak (PCB) berkemasan kuprum (Cu) dikenakan pematerian aliran semula pada suhu puncak 260°C untuk menghasilkan sambungan pateri SAC dan SAC-CNT. Sambungan pateri SAC dan SAC-CNT kemudiannya dikenakan penuaan terma melalui ujian penyimpanan suhu tinggi (HTS) selama 200, 400, 600, 800 dan 1000 j pada suhu tetap iaitu 150°C. Sampel sambungan pateri selepas pematerian dan penuaan terma dianalisis melalui kaedah pelekukan nano untuk menentukan sifat kekerasannya. Untuk analisis mikrostruktur, sampel dipunar dan imej dicerap melalui mikroskop optik. Keputusan menunjukkan nilai kekerasan menurun dengan peningkatan masa penuaan bagi kedua-dua sambungan pateri yang dikaji. Walau bagaimanapun, sambungan pateri SAC-CNT mempunyai kekerasan yang lebih tinggi iaitu sebanyak 10-26% berbanding sambungan pateri SAC. Melalui ujian pelekukan nano, sifat mikro kekerasan bagi sambungan pateri akibat tindakan penuaan terma sesuhu yang bersifat setempat dapat ditentukan. Corak nilai mikro kekerasan yang diperoleh adalah selari dengan corak yang diperoleh menggunakan kaedah ujian kekerasan konvensional

Review of the Common Deposition Methods of Thin-Film Pentacene, Its Derivatives, and Their Performance

Pentacene is a well-known conjugated organic molecule with high mobility and a sensitive photo response. It is widely used in electronic devices, such as in organic thin-film transistors (OTFTs), organic light-emitting diodes (OLEDs), photodetectors, and smart sensors. With the development of flexible and wearable electronics, the deposition of good-quality pentacene films in large-scale organic electronics at the industrial level has drawn more research attention. Several methods are used to deposit pentacene thin films. The thermal evaporation technique is the most frequently used method for depositing thin films, as it has low contamination rates and a well-controlled deposition rate. Solution-processable methods such as spin coating, dip coating, and inkjet printing have also been widely studied because they enable large-scale deposition and low-cost fabrication of devices. This review summarizes the deposition principles and control parameters of each deposition method for pentacene and its derivatives. Each method is discussed in terms of experimentation and theory. Based on film quality and device performance, the review also provides a comparison of each method to provide recommendations for specific device applications

Kesan penuaan sesuhu terhadap sifat mikro kekerasan pempaterian Sn-Ag-Cu/cnt/cu menggunakan pelekukan nano (Effect of isothermal aging on microhardness properties of Sn-Ag-Cu/CNT/Cu using nanoindentation)

Effect of thermal aging towards hardness properties of Sn-3.0Ag-0.5Cu (SAC305) solder joint added with carbon nanotube (CNT) particles was investigated. Hardness properties indicate the strength of solder was determined by nanoindentation approach. SAC solder alloy was added with 0.03% weight percent of CNT to form SAC305-CNT solder paste. Printed solder paste on printed circuit board (PCB) with copper (Cu) surface finish underwent reflow soldering at peak temperature 260°C to form SAC305 and SAC305-CNT solder joint. Then, SAC305 and SAC305-CNT were exposed to thermal aging via high temperature storage test (HTS) at constant temperature 150°C for about 200, 400, 600, 800 and 1000 h. Solder joint samples after reflow and thermal aging were analysed using nanoindentation method to determine hardness properties. For microstructure analysis, samples were etched and images were captured via optical microscope. The results showed microhardness values decrease with increasing of aging time for both investigated solder joints. However, hardness values for SAC305-CNT solder joint was higher (~10-26%) compared to SAC305 solder joint without CNT. From nanoindentation test, localized microhardness properties of solder joint under isothermal aging have been attained. Trend of microhardness values obtained was parallel with the trend gained by using conventional hardness test. © 2019 Penerbit Universiti Kebangsaan Malaysia. All rights reserved

Improvement of gas barrier properties of Polyethylene Terephtalate (PET) by Graphene Nanoplatelets (GNP)

This research is to studies the improvement of gas barrier properties of Polyethylene Terephtalate (PET) by graphene nanoplatelets (GNP). The composite is produced by solvent casting method. The GNP content is varied from 0 wt% to 2 wt%. The optimum tensile properties of PET/GNP nanocomposite is 34.7 MPa and the reduction of gas permeation is about 99% when the PET is mixed with 2 wt% of GNP. The scanning electron microscopy (SEM) revealed that the micropores are induced in PET/GNP nanocomposite. This suggests that PET in conjunction with GNP have the potential for high gas barrier properties in food packaging

Kesan sistematik modifikasi dielektrik dengan asid fosfonik alkil ekalapisan terhadap prestasi transistor filem nipis organik saluran-N

Kajian ini membincangkan tentang kesan panjang rantai karbon pada asid alkil fosfonik ekalapis pengumpulan kendiri terhadap prestasi transistor organik filem nipis saluran-n terbentuk berdasarkan N,N’-ditridekil-3,4,9,10-perilenadikarboximide (PTCDI-C13). Prestasi transistor organik filem nipis tersebut meningkat dengan peningkatan panjang rantai ekalapis pengumpulan kendiri pada dielektrik SiO2. Magnitud mobiliti setinggi 0.3 cm2/Vs dan nisbah arus buka/tutup lebih tinggi daripada 105 telah dicapai. Transistor tersebut adalah calon terbaik untuk menyaingi transistor organik filem nipis pentacene saluran-p untuk menghasilkan litar semikonduktor logam pelengkap teroksida organik (O-CMOS). Prestasi peranti ini tidak bergantung terhadap panjang rantaian alkil apabila diuji di dalam udara ambien

Implementation of capacitance as simultaneous sensing and actuating tool in tapered microelectrode arrays for dielectrophoresis-on-a-chip application

International audienceThis paper aims to present the capacitance characterization of tapered dielectrophoresis (DEP) microelectrodes as micro-electro-mechanical system sensor and actuator device. The application of DEP-on-a-chip (DOC) can be used to evaluate and correlate the capacitive sensing measurement at an actual position and end station of liquid suspended targeted particles by DEP force actuator manipulation.The capability of both, sensing and manipulation was analysed based on capacitance changes corresponding to the particle positioning and stationing of the targeted particles at regions of interest. The mechanisms of DEP sensor and actuator, designed in DOC applications were energized by electric field of tapered DEP microelectrodes. The actual DEP forces behaviour has been also studied via quantitative analysis of capacitance measurement value and its correlation with qualitative analysis of positioning and stationing of targeted particles.The significance of the present work is the ability of using tapered DEP microelectrodes in a closed mode system to simultaneously sense and vary the magnitude of manipulation. The integration of DOC platform for contactless electrical-driven with selective detection and rapid manipulation can provide better efficiency in in situ selective biosensors or bio-detection and rapid bio-manipulation for DOC diagnostic and prognostic devices