A5041974481- Graphene research and applications
- 2D Materials and Applications
- Thermal properties of materials
- Advanced biosensing and bioanalysis techniques
- Advanced Sensor and Energy Harvesting Materials
- MXene and MAX Phase Materials
- Molecular Junctions and Nanostructures
- Analytical Chemistry and Sensors
- Conducting polymers and applications
- Gas Sensing Nanomaterials and Sensors
- Thermal Radiation and Cooling Technologies
- Heat Transfer and Optimization
- Carbon Nanotubes in Composites
- Quantum and electron transport phenomena
- Electrochemical sensors and biosensors
- Optical measurement and interference techniques
- Perovskite Materials and Applications
- Nanowire Synthesis and Applications
- Tactile and Sensory Interactions
- Quantum Dots Synthesis And Properties
- Iron Metabolism and Disorders
- Electrochemical Analysis and Applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Mechanical and Optical Resonators
- Power Transformer Diagnostics and Insulation
Chinese University of Hong Kong
2020-2025
Qilu Hospital of Shandong University
2023-2025
University of Hong Kong
2013-2024
University of Pennsylvania
2016-2023
Wuyi University
2023
Chinese University of Hong Kong, Shenzhen
2022
CSIR National Physical Laboratory of India
2021
City University of Hong Kong, Shenzhen Research Institute
2021
University of California, Riverside
2021
Zero to Three
2020
Growth of transition metal dichalcogenide (TMD) monolayers is interest due to their unique electrical and optical properties. Films in the 2H 1T phases have been widely studied but some 1T′-TMDs are predicted be large-gap quantum spin Hall insulators, suitable for innovative transistor structures that can switched via a topological phase rather than conventional carrier depletion [Qian et al. Science 2014, 346, 1344−1347]. Here we detail reproducible method chemical vapor deposition...
Ultralow friction can be achieved with 2D materials, particularly graphene and MoS2. The nanotribological properties of these different materials have been measured in previous atomic force microscope (AFM) experiments sequentially, precluding immediate direct comparison their frictional behavior. Here, is characterized at the nanoscale using AFM same tip sliding over graphene, MoS2, a graphene/MoS2 heterostructure single measurement, repeated hundreds times, also slowly varying normal...
All-electronic DNA biosensors based on graphene field-effect transistors (GFETs) offer the prospect of simple and cost-effective diagnostics. For GFET sensors complementary probe DNA, sensitivity is limited by binding affinity target oligonucleotide, in nM range for 20 mer targets. We report a ∼20 000× improvement through use engineered hairpin that allows recycling hybridization chain reaction. This enables detection 21 at sub-fM concentration provides superior specificity against...
Large-area growth of monolayer films the transition metal dichalcogenides is utmost importance in this rapidly advancing research area. The mechanical exfoliation method offers high quality material but it a problematic approach when applied to materials that are not air stable. One important example 1T'-WTe2, which multilayer form reported possess large non saturating magnetoresistance, pressure induced superconductivity, and weak antilocalization effect, electrical data for yet be due its...
Abstract Mixed‐dimensional heterostructures provide additional freedom to construct diverse functional electronic and optoelectronic devices, gaining significant interest. Herein, highly‐aligned pseudo‐1D tellurium is epitaxially grown on 2D monolayer transition metal dichalcogenides (TMDs), including MoSe 2 , MoS WS . A one‐pot chemical vapor deposition (CVD) technique eliminates the normally required transfer steps, thereby producing mixed‐dimensional with an ultraclean interface. The...
Abstract The properties of van der Waals (vdW) materials often vary dramatically with the atomic stacking order between layers, but this can be difficult to control. Trilayer graphene (TLG) stacks in either a semimetallic ABA or semiconducting ABC configuration gate-tunable band gap, latter has only been produced by exfoliation. Here we present chemical vapor deposition approach TLG growth that yields greatly enhanced fraction and size domains. key insight is substrate curvature stabilize...
Vanadium diselenide (VSe2) exhibits versatile electronic and magnetic properties in the trigonal prismatic (H-) octahedral (T-) phases. Compared to metallic T-phase, H-phase with a tunable semiconductor property is predicted be ferrovalley material spontaneous valley polarization. Herein we report an epitaxial growth of monolayer 2D VSe2 on mica substrate via chemical vapor deposition (CVD) method by introducing salt precursor. Our first-principles calculations suggest that large lateral...
Abstract Cough is a common symptom of various respiratory diseases. However, recognizing subject's cough using acoustic imaging can be challenging due to the complexity coughing and vulnerability acquisition external interference. This research aims address these issues by utilizing flexible piezoelectric ionic liquid‐doped poly(L‐lactic acid) (PLLA) sensor gather pressure signals from human surface. 1‐butyl‐3‐methylimidazolium bis (trifluoromethylsulfonyl)imide ([BMIm]TFSI) liquid (IL)...
We have developed a scalable fabrication process for the production of DNA biosensors based on gold nanoparticle-decorated graphene field effect transistors (AuNP-Gr-FETs), where monodisperse AuNPs are created through physical vapor deposition followed by thermal annealing. The FETs in four-probe configuration, using an optimized bilayer photolithography that yields chemically clean devices, as confirmed XPS and AFM, with high carrier mobility (3590 ± 710 cm2/V·s) low unintended doping...
Heterostructures of transition metal dichalcogenides (TMDs) offer the attractive prospect combining distinct physical properties derived from different TMD structures. Here, we report direct chemical vapor deposition in-plane monolayer heterostructures based on 1H-MoS2 and 1T'-MoTe2. The large lattice mismatch between these materials led to intriguing phenomena at their interface. Atomic force microscopy indicated buckling in 1H region. Tip-enhanced Raman spectroscopy showed mode structure...
Bilayer two-dimensional (2D) van der Waals (vdW) materials are attracting increasing attention due to their predicted high quality electronic and optical properties. Here, we demonstrate dense, selective growth of WSe2 bilayer flakes by chemical vapor deposition with the use a 1:10 molar mixture sodium cholate chloride as promoter control local diffusion W-containing species. A large fraction showed 0 (AB) 60° (AA′) twist between two layers, whereas Moiré 15 30° angles were also observed....
Poly-l-lactic acid (PLLA) is a synthetic, biocompatible, biodegradable polymer with good piezoelectric properties. The prepared PLLA films were annealed in the oven at 140 °C for 0 h, 3 12 and 24 respectively. influences of temperature treatment time on optoelectronic properties sensors based them investigated. morphology crystal structure obtained under various post-processing conditions examined by scanning electron microscopy, X-ray diffraction, Raman spectroscopy, ATR-FTIR spectroscopy....
Wearable sweat monitoring represents an attractive opportunity for personalized healthcare and evaluating sports performance. One of the limitations with such monitoring, however, is water layer formation upon cycling ion-selective sensors, leading to degraded sensitivity long-term instability. Our report first use chemical vapor deposition-grown, three-dimensional, graphene-based, gradient porous electrodes minimize formation. The proposed design reduces ion diffusion path within polymeric...
We developed a high-yield synthesis of highly crystalline bilayer graphene (BLG) with two preferential stacking modes using Ni–Cu gradient alloy growth substrate. Previously reported approaches for BLG include flat substrates Cu or uniform alloys and "copper pocket" structures. Use has the advantage being scalable, but mechanism is either "surface limited" (for Cu) carbon precipitation Ni–Cu), which results in multicrystalline grains. For copper pockets, proceeds through back-diffusion...
Biosensors based on graphene field effect transistors (GFETs) decorated with antibody‐functionalized platinum nanoparticles (PtNPs) are developed for the quantitative detection of breast cancer biomarker HER3. High‐quality chemical vapor deposited is prepared and transferred over gold electrodes microfabricated an SiO 2 /Si wafer to yield array 52 GFET devices. The GFETs modified PtNPs obtain a hybrid nanostructure suitable attachment HER3‐specific, genetically engineered thiol‐containing...
The metal-semiconductor interface fabricated by conventional methods often suffers from contamination, degrading transport performance. Herein, we propose a one-pot chemical vapor deposition (CVD) process to create two-dimensional (2D) MoO
High quality vertically aligned carbon nanotube (VACNT) arrays have been synthesized on bulk Al alloy (Al6063) substrates with an electron-beam (E-beam) evaporated Fe catalyst using low pressure chemical vapor deposition (LPCVD). The pretreatment process of the was shown to play a critical role. This studied comprehensively and optimized repeatedly grow high VACNT within wide range thicknesses layer (2–11 nm) acetylene (C2H2) flow rates (100–300 sccm). thermal performance resulting...
The detection and analysis of rare cells in complex media such as blood is increasingly important biomedical research clinical diagnostics. Micro-Hall detectors (μHD) for magnetic have previously demonstrated ultrahigh sensitivity to cells. This originates from the minimal background blood, obviating cumbersome detrimental sample preparation. However, translation this technology applications has been limited by inherently low throughput (<1 mL/h), susceptibility clogging, incompatibility...
This article uses innovative UV-curable acrylate elastomer with AgNWs to develop flexible strain sensors for wrist movement monitoring.
Lyme disease is an infectious caused by the Borrelia burgdorferi bacterium. Early diagnosis of could prevent patients from developing serious side effects such as chronic arthritis and permanent neurological disorders. currently held back a lack reliable tools that are sufficiently sensitive specific to allow early stage detection. Here, we demonstrate all electronic nano-biosensors for multiplexed detection antigens B. at concentrations low 2 pg ml−1. The sensors based on graphene...
Scalable micro graphene Hall sensors (μGHSs) hold tremendous potential for highly sensitive and label-free biomagnetic sensing in physiological solutions. To enhance the performance of these devices, it is crucial to optimize frequency-dependent flicker noise reduce limit detection (LOD), but remains a great challenge due large contact resistance at graphene–metal contact. Here we present surface modification strategy employing persistent carbene on gold electrodes resistivity by factor 25,...