A5040079092- 2D Materials and Applications
- Graphene research and applications
- MXene and MAX Phase Materials
- Chalcogenide Semiconductor Thin Films
- Electronic Packaging and Soldering Technologies
- 3D IC and TSV technologies
- Perovskite Materials and Applications
- Advancements in Battery Materials
- Molecular Junctions and Nanostructures
- Semiconductor materials and devices
- Semiconductor materials and interfaces
- Quantum and electron transport phenomena
- Advancements in Semiconductor Devices and Circuit Design
- Peptidase Inhibition and Analysis
- Nanowire Synthesis and Applications
- Advanced biosensing and bioanalysis techniques
- Cancer Mechanisms and Therapy
- Surface and Thin Film Phenomena
- Carbon Nanotubes in Composites
- RNA Interference and Gene Delivery
- Ferroelectric and Negative Capacitance Devices
- Quantum Dots Synthesis And Properties
- Copper Interconnects and Reliability
- Advanced Thermoelectric Materials and Devices
- Integrated Circuits and Semiconductor Failure Analysis
National University of Singapore
2013-2021
Singapore University of Social Sciences
2021
Massachusetts Institute of Technology
2017-2020
Singapore University of Technology and Design
2017-2018
University of Technology Malaysia
2012
Abstract The performance and reliability of large-area graphene grown by chemical vapor deposition are often limited the presence wrinkles transfer-process-induced polymer residue. Here, we report a transfer approach using paraffin as support layer, whose thermal properties, low reactivity non-covalent affinity to enable wrinkle-reduced clean graphene. paraffin-transferred has smooth morphology high electrical with uniform sheet resistance ~1% deviation over centimeter-scale area. Electronic...
We report an approach to achieve low-resistance contacts MoS2 transistors with the intrinsic performance of channel preserved. Through a dry transfer technique and metal-catalyzed graphene treatment process, nickel-etched-graphene electrodes were fabricated on that yield contact resistance as low 200 ohm-um. The substantial enhancement (~2 orders magnitude) compared pure nickel electrodes, is attributed much smaller work function nickel-graphene together fact presence zigzag edges in treated...
The performance of graphene-based transistors is often limited by the large electrical resistance across metal-graphene contact. We report an approach to achieve ultralow metal contacts graphene transistors. Through a process metal-catalyzed etching in hydrogen, multiple nanosized pits with zigzag edges are created portions under source/drain while channel remains intact. porous pure zigzag-termination form strong chemical bonds deposited nickel metallization without need for further...
Annealing is a postprocessing treatment commonly used to improve metal-graphene contacts with the assumption that resist residues sandwiched at are removed during annealing. Here, we examine this by undertaking systematic study understand mechanisms lead contact enhancement brought about Using soft shadow-mask, fabricated residue-free same dimensions as lithographically defined on graphene flake. Both cases show comparable for nickel-graphene after annealing signifying removal of not main...
We report on the demonstration of photodetectors based large scale two-dimensional molybdenum disulfide (MoS2) transition metal dichalcogenides. Excellent film uniformity and precise control MoS2 thickness down to a monolayer (~0.75nm) were achieved by magnetron sputtering synthesis approach. In particular, integrated with five monolayers exhibit high photoresponsivity 1.8 A/W, an external quantum efficiency exceeding 260%, photodetectivity ~5 x 10(8) Jones for wavelength 850 nm, surpassing...
Lateral heterostructures with planar integrity form the basis of two-dimensional (2D) electronics and optoelectronics. Here we report that, through a two-step chemical vapor deposition (CVD) process, high-quality lateral can be constructed between metallic semiconducting transition metal disulfide (TMD) layers. Instead edge epitaxy, polycrystalline monolayer MoS2 in such junctions was revealed to nucleate from vertices multilayered VS2 crystals, creating one-dimensional ultralow contact...
Abstract Since the discovery of metal nanoparticles (NPs) in 1960s, unknown toxicity, cost and ethical hurdles research humans have hindered translation these NPs to clinical use. In this work, we demonstrate that Pt with protein coronas are generated vivo human blood when a patient is treated cisplatin. These self-assembled form rapidly, accumulate tumors, remain body for an extended period time. Additionally, safe use can act as anti-cancer agents inhibit chemotherapy-resistant tumor...
Controlling the threshold voltage (Vth) of a field-effect transistor is important for realizing robust logic circuits. Here, we report facile approach to achieve bidirectional Vth tuning molybdenum disulfide (MoS2) transistors. By increasing and decreasing amount sulfur vacancies in MoS2 surface, transistors can be left- right-shifted, respectively. Transistors fabricated on perfect flakes are found exhibit two-fold enhancement mobility very positive (18.5 ± 7.5 V). More importantly, our...
The urgently growing demand for lowering the power consumption and increasing performance in electronic optoelectronic systems has been driving scientific community to explore new materials device architectures. In light of this, 2-D including graphene, hexagonal boron nitride, transition metal dichalcogenides have potential revolutionize our semiconductor industry by scaling devices down atomic level. These benefit from several unique properties, endowed their nature, such as surface free...
The reliability of lead-free Cu bonding technology is often limited by high temperature and perpetual growth intermetallic compounds between Sn solder substrate. Here, we report a low-bonding-temperature highly reliable strategy with the use graphene as an interlayer. By integrating nanoscale graphene/Cu composite on substrate prior to thermocompression bonding, observe macroscale phenomenon where Sn–Cu joints can be fabricated at low 150 °C. During process, features are replicated in...
Aerobic glycolysis enables cancer cells to rapidly take up nutrients (e.g., nucleotides, amino acids, and lipids) incorporate them into the biomass needed produce a new cell. In contrast existing chemotherapy/radiotherapy strategies, inhibiting aerobic limit adenosine 5′-triphosphate (ATP) yield is highly efficient approach for suppressing tumor cell proliferation. However, most, if not all, current inhibitors of cause significant adverse effects because their nonspecific delivery...
To date, the chemical vapor deposition (CVD) approach has been widely used for growth of transition metal dichalcogenides (TMDs). However, reported CVD methods to synthesize TMDs cannot be grow more than one type TMDs. This work reports a promising technique concurrently multiple monolayer disulfides once. The optoelectrical characterization and high‐resolution transmission electron microscopy show high quality crystals, and, importantly, there is no mixing between different precursors...
Drug resistance of paclitaxel (TAX), the first-line chemotherapy drug for breast cancer, was reported to develop in 90% patients with especially metastatic cancer. Investigating mechanism TAX cancer cells and developing strategy improving its therapeutic efficiency are crucial cure. We here report an elegant nanoparticle (NP)-based technique that realizes efficient treatment TAX. Using lentiviral vector-mediated gene knockdown, we first demonstrated closely correlated metadherin (MTDH)...
Semimetallic-layered transition-metal dichalcogenides, such as TiS2, can serve a platform material for exploring novel physics modulated by dimensionality, well developing versatile applications in electronics and thermoelectrics. However, controlled synthesis of ultrathin TiS2 dry-chemistry way has yet to be realized because the high oxophilicity active Ti precursors. Here, we report ambient pressure chemical vapor deposition (CVD) method grow large-size, highly crystalline two-dimensional...
Large-area hexagonal boron nitride (h-BN) can be grown on polycrystalline metallic substrates via chemical vapor deposition (CVD), but the impact of local inhomogeneities electrical properties h-BN and their effect in electronic devices is unknown. Conductive atomic force microscopy (CAFM) probe station characterization show that tunneling current across stack fluctuates up to 3 orders magnitude from one substrate (Pt) grain another. Interestingly, variability within same very low, which may...
Synthesis and characterization of high-quality single-crystal tungsten diselenide (WSe2) films on a highly insulating substrate is presented. We demonstrate for the first time that presence gold (Au) nanoparticles in basal plane WSe2 film can enhance its Raman scattering intensity. The experimentally observed enhancement ratio signal correlates well with simulated electric field intensity using both three-dimensional electromagnetic software theoretical calculation considering layered medium...
Edge contact geometries are thought to yield ultralow resistances in most non-ferromagnetic metal-graphene interfaces owing their large coupling strengths. Here, we examine the resistance of edge- versus surface-contacted ferromagnetic (i.e. nickel- and cobalt-graphene interfaces) using both single-layer few-layer graphene. Good qualitative agreement is obtained between theory experiment. In particular, experiment, observe that edge-contacted much lower than ones, for all devices studied...
Selective occlusion of tumor vasculature has proven to be an effective strategy for cancer therapy. Among vascular coagulation agents, the extracellular domain coagulation-inducing protein tissue factor, truncated factor (tTF), is most widely used. Since exhibits no activity and rapidly cleared in circulation, free tTF cannot used treatment on its own but must combined with other moieties. We here developed a novel, tumor-specific delivery system through coupling DNA aptamer, AS1411, which...
No characterization method is available to quickly perform quality inspection of 2D materials produced on an industrial scale. This hinders the adoption for product manufacturing in many industries. Here, we report artificial-intelligence-assisted Raman analysis probe centimeter-large graphene samples a non-destructive manner. Chemical vapor deposition devised this work such that two types were obtained: layer-plus-islands and layer-by-layer films, at centimeter scales. Using these samples,...