PC Ooi

PC Ooi
University of Auckland · Department of Mechanical Engineering

PhD in Mechanical Engineering

About

54
Publications
6,328
Reads
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494
Citations
Citations since 2016
38 Research Items
442 Citations
2016201720182019202020212022020406080100
2016201720182019202020212022020406080100
2016201720182019202020212022020406080100
2016201720182019202020212022020406080100
Additional affiliations
April 2014 - February 2015
Fuzhou University
Position
  • PostDoc Position

Publications

Publications (54)
Article
In this work, we demonstrate the fabrication of a transparent and flexible memory device in the simple structure of metal/dielectric/metal (MIM). Here, the MIM structure consists of gold electrode/200 nm Parylene-C/20 nm gold nanoparticles/100 nm Parylene-C/indium-tin-oxide (ITO) coated polyethylene terephthalate (PET). The use of parylene as the d...
Article
We fabricated non-volatile memories from metal–insulator–semiconductor structure to investigate the effects of different metal electrodes and dielectric thickness towards the electrical behaviour of the device. The insulator layer is a nanocomposite layer consists of embedded gold nanoparticles in polymethylsilsesquioxane. The AuNPs have an average...
Article
In this communication the electrical characteristics of poly(methylsilsesquioxane) (PMSSQ) thin films and the possibility of charge storage in the Au nanoparticle embedded PMSSQ film base memory element have been studied. PMSSQ films were sandwiched between Al and Si electrodes to fabricate metal–polymer–semiconductor (MPS) structures. The conducti...
Article
a b s t r a c t An organic–inorganic (hybrid) nanocomposite layer as non-volatile memory (NVM) using sol–gel poly-methylsilsesquioxane (PMSSQ) embedded with gold (Au) nanoparticles has been presented in this article. The NVM is based on a capacitor structure. The Au nanoparticles used in this work were synthesized by chemical reduction method where...
Article
Full-text available
This study describes a novel fabrication technique to grow gold nanoparticles (AuNPs) directly on seeded ZnO sacrificial template/polymethylsilsesquioxanes (PMSSQ)/Si using low-temperature hydrothermal reaction at 80[degree sign]C for 4 h. The effect of non-annealing and various annealing temperatures, 200[degree sign]C, 300[degree sign]C, and 400[...
Chapter
Carbon is the 4th most abundant element in the universe and the foundation of life, despite the various elements on the Earth. Its existence extended from nonliving substances to living objects. The carbon material is a big family with many allotropes, and they possess unique structure, texture, and properties. Most carbon‐based materials are natur...
Chapter
The carbon‐based nanomaterials enhanced the device's performance attributed to their fascinating unique structural dimensions, and in addition to excellent mechanical, electrical, thermal, optical, and chemical properties. Although several promising signs of progress have been accomplished, however, some challenges must be addressed before the comp...
Chapter
Piezoelectric materials possess the property of converting mechanical stimuli into electrical energy. The electroactive phase of the piezoelectric effect can be enhanced by adding nanofillers. In this chapter, the exploration of inorganic piezoelectric materials as energy harvesters is briefly discussed. Then, the focus is steered to organic piezoe...
Chapter
Various low‐dimensional carbon nanostructures with remarkable thermal, electronic, optical, and mechanical properties can be used to fabricate flexible and transparent carbon‐based non‐volatile memory (NVM). Various carbon nanostructures can play the role of a conductive electrode, dielectric, and charge‐trapping site. This chapter will briefly dis...
Article
Full-text available
Intravenous cannulation is experientially traumatic to children. To minimize this, EMLA® is applied on the would-be-cannulated area before IV cannula insertion. However, the time to achieve its maximum efficacy may be affected due to incomplete cutaneous absorption and the duration of application. The latter may be a limiting factor in a busy healt...
Article
Diabetes mellitus (DM), an ailment caused by unregulated blood sugar levels, can lead to the failure of more than one organ in patients. Currently, blood tests are being conducted in scientific trials to analyse and track blood sugar and ketone levels. In this method, a drop of blood from a pricked finger is placed on a sensitive strip area, which...
Article
The addition of TiO 2 nanoparticles (NPs) to a white-emission conjugated polymer (CP) blend of poly(9,9-dioctylfluorene-2,7-diyl) (PFO) and poly(2-methoxy-5(2-ethylhexyl)−1,4-phenylenevinylene (MEH-PPV) enhanced the optical properties. However, the agglomeration of the nanoparticles restricted enhancement. This drawback was successfully overcome in...
Article
This work demonstrated the effect of the β-chain alignment degree on piezoelectric nanogenerator (PNG) performance. A simple, safe and low-cost fast-centrifugal spinning technique was used to produce self-poled poly(vinylidene fluoride) (PVDF) nanofiber. PNG based on acetone-prepared PVDF fibers, with high β-chain alignment, generated output open-c...
Article
Numbers of energy harvesting studies have reported that using the appropriate electrode materials could enhance the electrical output performance of the energy harvesters. In this work, we fabricated polyvinylidene fluoride (PVDF)-based piezoelectric nanogenerators (PENGs) using the solution-process method. Different combinations of silver nanowire...
Article
Inclusive detection of organic compounds in aqueous solutions is a promising yet challenging approach for photoelectrochemical (PEC) sensors. In this work, the combined factors of crystalline phase change and Ti³⁺ self-doping were introduced to some fabricated anodic TiO2 nanotubes (ATNTs) to improve their efficacy as potential PEC sensors. Several...
Article
Full-text available
A new 2D titanium carbide (Ti3C2), a low dimensional material of the MXene family has attracted remarkable interest in several electronic applications, but its unique structure and novel properties are still less explored in piezoelectric energy harvesters. Herein, a systematic study has been conducted to examine the role of Ti3C2 multilayers when...
Article
Full-text available
The electrochemical biosensor devices based on enzymes for monitoring biochemical substances are still considered attractive. We investigated the immobilization of glucose oxidase (GOx) on a new composite nanomaterial poly(3,4-ethylenedioxythiophene): polystyrene sulfonate (PEDOT:PSS)/titanium carbide,(Ti3C2)/graphene quantum dots(GQD) modified scr...
Article
Full-text available
By applying dual anodization procedures of aluminum (Al) thin film over silicon substrate under controlled anodizing process conditions, a thin anodic alumina (AAO) pattern with hexagonal honeycomb-like arrangement nano-pores and highly-regular aligned arrays was created. Anodizing DC voltage was thought to have an effect on pore size dimensions. W...
Article
In this research work, low atomic number (Z) carbon ions (C⁺) were used to treat titanium oxide nanoparticles (TiO2-NPs) and tune their optical properties. 8 MeV C⁺ were irradiated on TiO2-NPs at different fluences in the ranges of 2.5×1015to1×1016ions/cm2 to separately study their defects production and the effect on the bandgap. The C⁺ ion treate...
Article
Full-text available
We report a practical chemical vapor deposition (CVD) route to produce bilayer graphene on a polycrystalline Ni film from liquid benzene (C6H6) source at a temperature as low as 400 °C in a vertical cold-wall reaction chamber. The low activation energy of C6H6 and the low solubility of carbon in Ni at such a low temperature play a key role in enabl...
Article
Certainly diluted magnetic semiconductor Zn1-xCoxO has been investigated over the years, yet the morphological aspects and the structural influence on the magnetic properties of Co-doped ZnO nanowires still needs a clear understanding. The 1D magnetic nanowires possess exceptional magnetic properties and potential candidate as magnetic devices, bec...
Article
Full-text available
We investigated theoretically the feasibility of the SiC membrane to be applied to a MEMS capacitive microphone system in the ultrasonic frequency range. The fascinating electromechanical properties of SiC materials as membranes were examined to operate beyond 20 kHz to detect sound waves. The finite element method of real behavior microphone was c...
Article
Full-text available
Room-temperature ferromagnetism in the large and direct bandgap diluted magnetic semiconductor zinc oxide (ZnO) is attributed to the intrinsic defects and p-orbital–p-orbital (p–p) coupling interaction. However, due to oxidation, the ferromagnetism induced by defects is unstable. In the present work, the solution process synthesis route was utilize...
Article
Full-text available
In this study, we demonstrated the fabrication of the concave conic shape microneedle with the aid of COMSOL Multiphysics simulation. The stress and buckling of the microneedle structure were simulated by applying various loads ranging from 50-800 g perpendiculars to the tip in order to predict the occurrence of microneedles structure deformation....
Article
Full-text available
We demonstrated the fabrication of a highly stable non-volatile memory (NVM) device using pulsed radiofrequency (rf) plasma polymerization and a simple solution route. The two-terminal NVM devices were fabricated based on a metal-insulator-metal (MIM) structure consisting of graphene quantum dots (GQDs) embedded in hexamethyldisiloxane (HMDSO) diel...
Article
Piezoelectric nanogenerator (PENG) is an alternative sustainable solution by transforming surrounding mechanical energy into electrical power. In this work, the optically transparent and mechanically flexible PENG devices were fabricated using simple all-solution-processed techniques. The device was constructed using spin- and spray coating methods...
Article
Full-text available
This study demonstrates the feasibility of all-solution-processed mean to fabricate carbon-based non-volatile memory (NVM). The NVM devices were fabricated on polyethylene terephthalate (PET) substrate using spin-coating and spray-coating techniques in the structure of silver nanowires (AgNWs)/graphene oxide (GO)/graphene quantum dots (GQDs)/graphe...
Article
Purpose The purpose of this paper is to propose an alternative approach to improve the performance of microelectromechanical systems (MEMSs) silicon (Si) condenser microphones in terms of operating frequency and sensitivity through the introduction of a secondary material with a contrast of mechanical properties in the corrugated membrane. Design/...
Article
Full-text available
In the interest of the trend towards miniaturization of electronic gadgets, this study demonstrates a high-density data storage device with a very simple three-stacking layer consisting of only one charge trapping layer. A simple solution-processed technique has been used to fabricate the tristable non-volatile memory. The three-stacking layer was...
Article
Full-text available
This work demonstrated a growth of well-aligned NiSi/SiC core-shell nanowires by a one-step process of hot-wire chemical vapor deposition on Ni-coated crystal silicon substrates at different thicknesses. The NiSi nanoparticles (60 to 207 nm) acted as nano-templates to initially inducing the growth of these core-shell nanowires. These core-shell nan...
Article
We demonstrated a simple and scalable fabrication route of nitrogen-doped reduced graphene oxide (N-rGO) photodetector on 8-inch wafer-scale. The N-rGO was prepared through in-situ plasma-treatment in an acetylene-ammonia atmosphere to achieve n-type semiconductor with substantial formation of quaternary-N substituted into the graphene lattice. The...
Article
Full-text available
We fabricated copper oxide nanowires (CuO NWs) ultraviolet (UV) light-assisted hydrogen gas sensor. The fabricated sensor shows promising sensor response behavior towards 100 ppm of H2 at room temperature and elevated temperature at 100 °C when exposed to UV light (3.0 mW/cm2). One hundred-cycle device stability test has been performed, and it is f...
Article
We demonstrated the feasibility of indium-tin-oxide free, solution processable flexible nanogenerator using the nanocomposite mixture consists of polyvinylidene fluoride polymer, barium titanate and graphene quantum dots (GQDs) on the 2.0 cm by 2.5 cm polyethylene terephthalate substrate. Poly (3, 4-ethylenedioxythiophene)-poly (styrenesulfonate) w...
Article
We demonstrated the feasibility to fabricate two-terminal non-volatile-memory (NVM) devices using pulsed radio frequency (rf) plasma polymerization and simple solution route. The two-terminal NVM devices were fabricated based on a metal-insulator-metal structure consisting of graphene quantum dots (GQDs) embedded in hexamethyldisiloxane dielectric...
Article
Tristable switching nonvolatile memory (NVM) devices based on graphene quantum dots (GQDs) sandwiched between multi-stacked poly (methyl methacrylate) (PMMA) layers were fabricated on indium-tin-oxide (ITO)-coated glass substrates by using a solution-processed method. Current-voltage (I-V) curves at 300 K for the silver nanowire/PMMA/GQD/PMMA/GQD/P...
Article
Indium-tin-oxide (ITO) free, nonvolatile memory (NVM) devices based on graphene quantum dots (GQDs) sandwiched between polymethylsilsesquioxane (PMSSQ) layers were fabricated directly on polyethylene terephthalate (PET) substrates by using a solution process technique. Current-voltage (I-V) curves for the silver nanowire/PMSSQ/GQD/PMSSQ/poly(3,4-et...
Article
Nonvolatile memory (NVM) devices based on a metal–insulator–metal structure consisting of CdSe/ZnS quantum dots embedded in polymethylsilsesquioxane dielectric layers were fabricated. The current–voltage (I–V) curves showed a bistable current behavior and the presence of hysteresis. The current–time (I–t) curves showed that the fabricated NVM memor...
Article
Full-text available
Non-volatile memory (NVM) devices using graphene quantum dots (GQDs) as charge trapping sites were fabricated with silver nanowires as top electrodes using solution process. The stacking structure consists of GQDs embedded between polymethylsilsesquioxane layers constructed on transparent flexible substrate. Hysteresis window was observed in the cu...
Article
Full-text available
The direct observation of single crystal graphene growth and its shape evolution is of fundamental importance to the understanding of graphene growth physicochemical mechanisms and the achievement of wafer-scale single crystalline graphene. Here we demonstrate the controlled formation of single crystal graphene with varying shapes, and directly obs...
Article
Full-text available
Please note that terms and conditions apply. Transparent and flexible nonvolatile memory using poly(methylsilsesquioxane) dielectric embedded with cadmium selenide quantum dots Transparent and flexible nonvolatile memory using poly(methylsilsesquioxane) dielectric embedded with cadmium selenide quantum dots In this work, a transparent and flexible...
Article
This work describes the formation of gold nanoparticles (AuNPs) by using the sacrificial template growth hydrothermal method. AuNPs was grown on Aluminum/ polymethylsilsesquioxanes (PMSSQ) /Silicon substrates. Sputtered Al was used as a sacrificial template. The effect of hydrothermal reaction time on AuNPs properties was investigated for 1, 2, 3 a...
Article
This work describes the properties of gold nanoparticles (AuNPs) embedded in polymethylsilsesquioxane (PMSSQ) as an organic dielectric layer. AuNPs were grown on this dielectric layer via the sacrificial hydrothermal process using ZnO seeded template prepared by thermal evaporation. Template prepared by using the thermal evaporation method has adva...
Article
This paper describes a novel fabrication technique to grow gold nanoparticles (AuNPs) by using the sacrificial templated growth hydrothermal reaction approach. The effect of zinc nitrate Zn (NO3)2 concentration in the hydrothermal reaction on the formation of AuNPs was studied by varying the concentration from 0.01 M, 0.05 M, 0.1 M and 0.2 M. The i...
Article
In this work, we demonstrated a simple fabrication route towards an optically transparent and flexible memory device. The device is simple and consists of a metal/insulator/semiconductor structure; namely MIS. The preliminary MIS study with gold nanoparticles embedded between the polymethylsilsesquioxane layers was fabricated on p-Si substrate and...

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Project (1)
Project
Surface Acoustic Wave Biosensor, Pulse R.F. Polymerization