# Lei Wang's research while affiliated with National University of Singapore and other places

## Publications (145)

Article
Two-dimensional (2D) magnetic materials provide an ideal platform for investigating novel magnetism and spin behavior in low-dimensional systems while being restricted by the deficiency of accurate bottom-up synthesis. To overcome this difficulty, a facile and universal flux-assisted growth (FAG) method is proposed to synthesize the multicomponent...
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Developing active single-atom-catalyst (SAC) for alkaline hydrogen evolution reaction (HER) is a promising solution to lower the green hydrogen cost. However, the correlations are not clear between the chemical environments around the active-sites and their desired catalytic activity. Here we study a group of SACs prepared by anchoring platinum ato...
Article
Cation substitutions have the significant impact on suppressing the detrimental defects and associated clusters of CZTSSe thin film solar cells. In our work, trace Ca is used to replace Zn to control the cationic disorder in CZTSSe absorber, improving the performance of CZTSSe solar cells. By tuning the amount of Ca doping, the alloyed Cu2CaxZn1-xS...
Article
Controlling the formation of harmful defects plays an important role in obtaining high efficiency Cu2ZnSn(S,Se)4 (CZTSSe) solar cells. Here, the extra tiny Ce³⁺ is used to reduce the cation disordering of absorber, improving the performance of devices. Based on the ionic liquid-based solution approach, we prepared the different Ce-doped CZTSSe devi...
Preprint
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The extra CO2 that has already been released into the atmosphere has to be removed in order to create a world that is carbon neutral. Technologies have been created to remove carbon dioxide from wet flue gas or even directly from ambient air, however these technologies are not widely deployed yet. New generations of creative CO2 capture sorbents ha...
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The luminescent materials with unique near-infrared (NIR) emission have attracted intensive attentions due to their potential broad applications. As an alternative to current widely used lanthanide ions or Cr3＋ doped phosphors, we develop a new series of KAl11O17:Fe3＋ (KAO:Fe3＋) and RbAl11O17:Fe3＋ (RAO:Fe3＋) NIR luminescent materials, both of which...
Article
Van der Waals (vdW) assembly of two-dimensional materials has long been recognized as a powerful tool for creating unique systems with properties that cannot be found in natural compounds [Nature 499, 419 (2013)]. However, among the variety of vdW heterostructures and their various properties, only a few have revealed metallic and ferroelectric beh...
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The contact splitting hypothesis (CSH) has been proposed for around 20 years, which suggests that the patterned or fibrillar surfaces enable very efficient biological attachment systems (e.g., Geckos’ seta). However, there is still a debate in academic community on the necessity of the CSH in man-made adhesives, since experiments have indicated tha...
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Organic micropollutants are a broad chemical category that includes PAHs, endocrine disruptors, antibiotics (2021), plasticizers, and flame-retardants. These pollutants are a global issue, and their trace amount (ng L-1 to g L-1) carries substantial adverse impacts on the environment and public
Article
Here, rational design electrodes are fabricated by mixing MXene with an aqueous solution of chloroauric acid (HAuCl4). In order to prevent MXene from self-restacking, the groups of -OH on the surface of Ti3C2Tx nanosheets underwent a one-step simultaneous self-reduction from AuCl4-, generating spaces for rapid ion transit. Additionally, by using th...
Article
Designing cost-effective and highly active oxygen reduction reaction (ORR) catalysts is critical for the development of Zn-air batteries (ZABs). Iron-nitrogen-carbon (Fe-N-C) catalysts with single-atom Fe-Nx active sites are considered as one of the most promising alternatives to noble Pt but are hindered by unsatisfactory activity and durability....
Article
It is challenging while critical to develop efficient catalysts that can achieve both high current density and high energy efficiency for electrocatalytic CO2 reduction (CO2R). Herein, we report a strategy of tailoring the surface electronic structure of an Ag catalyst via thiol ligand modification to improve its intrinsic activity, selectivity, an...
Article
In the past two decades, membrane technology has attracted considerable interest as a viable and promising method for water purification. Emerging organic micropollutants (EOMPs) in wastewater have trace, persistent, highly variable quantities and types, develop hazardous intermediates and are diffusible. These primary issues affect EOMPs polluted...
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High‐energy, stable, and flexible lithium batteries are highly demanded for next‐generation flexible and wearable electronics. Although the cycling stability of flexible lithium‐ion batteries (LIBs) is high, their energy density reaches the bottleneck because of the use of graphite anode. On the other hand, flexible lithium‐metal batteries provide...
Article
We theoretically study the broadband near-field optical spectrum of twisted bilayer graphene (TBG) at various twist angles near the magic angle using two different models. The spectrum at low Fermi energy is characterized by a series of peaks that are almost at the same energies as the peaks in the far-field optical conductivity of TBG. When the Fe...
Article
We cultured post-larval shrimp in four salinity treatment groups (SAL20 (control) = 20 ppt (parts per thousand), SAL10 = 10 ppt, SAL30 = 30 ppt, and SAL40 = 40 ppt) for 20 days (restriction stage) and then transferred them to the control salinity environment (20 ppt) for 20 days (compensation stage). The SAL40 group exhibited an over-compensation g...
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Phase engineering of nanomaterials (PEN) has demonstrated great potentials in the fields of catalysis, electronics, energy storage and conversion, and condensed matter physics. Recently, transition metal dichalcogenides (TMDs) with unconventional metastable phases (e.g., 1T and 1T′) has attracted increasing research interest due to their unique and...
Article
Ga2O3 possesses an ultra-wide bandgap (∼4.9 eV) and an extremely large breakdown field strength (∼8 MV/cm), which promises extraordinary application potential in power electronics and ultraviolet optoelectronics. With the demand for highly durable devices in harsh environments such as in low earth orbit spacecraft, in-depth understanding of the par...
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Acute hepatopancreatic necrosis disease (AHPND) caused by Vibrio parahaemolyticus causing AHPND (VPAHPND) is the most serious disease affecting shrimp farming. The PirAvp and PirBvp toxins of VPAHPND are known virulence factors. However, the corresponding target protein in shrimp that mediates their action has not been identified. By screening yeas...
Article
The redclaw crayfish (Cherax quadricarinatus) is being farmed on an increasing scale in various tropical and subtropical regions. The most distinctive feature of the adult male redclaw crayfish is the red cuticle patch on the lateral cuticle of the chelae. It is an important indicator of the health status, reproduction, and resistance to predators...
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Electrochemical reduction of carbon dioxide (CO2) is substantially researched due to its potential for storing intermittent renewable electricity and simultaneously helping mitigating the pressing CO2 emission concerns. The major challenge of electrochemical CO2 reduction lies on having good controls of this reaction due to its complicated reaction...
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Electrochemical CO2 Reduction In article number 2103900, Lei Wang and Jiayi Chen discuss the catalyst dynamic changes observed during catalysis, based on the recent reports of electrochemical CO2 reduction. Dynamic changes can occur for both the electrocatalyst and the surrounding microenvironment, and they play important roles in controlling the c...
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The Hindu Kush–Karakoram–Himalayan system, named the Third Pole because it is the largest global store of frozen water after the polar regions, provides a reliable water supply to almost 2 billion people. Marked atmospheric warming has changed the balance of this so-called Asian water tower and altered water resources in downstream countries. In th...
Article
In this paper, the electrical and ultraviolet optoelectronic properties of the interdigitated finger geometry β -Ga 2 O 3 photodetector were investigated from the temperature of 40 K to 300 K. Under different light illumination conditions, when the temperature increased from 40 K to 300 K, the maximum current of the β -Ga 2 O 3 photodetector was ob...
Article
The discovery of titanium silicalite-1(TS-1) is a milestone in the development of heterogeneous catalysts for the eco-benign and mild catalytic oxidation process. However, the interpretation of specific Ti location and its role in oxidation is severely hindered due to the limited crystal size of as-synthesized TS-1. Here, a high quality TS-1 (ca. 1...
Article
The bandstructure of a material, playing an important role in its electron transport property, is usually governed by the lattice configuration. Materials with a field-effect tunable band, such as bilayer and rhombohedral trilayer graphene, are more flexible for electronic applications. Here, on dual-gated twisted double bilayer graphene (TDBG) sam...
Article
In this study, limited water exchange was used to simulate small earthen ponds equipped with greenhouses for Penaeus vannamei culture by laying sediment in tanks, and we investigated the effects of treatment with potassium monopersulfate compound (KMPC) in multiple low‐dose (5 g/m3, three times every 2 weeks) and single high‐dose (15 g/m3, once eve...
Article
Selective electroreduction of CO2-derived CO presents an opportunity to produce sustainable fuels and chemicals; however, its performance has been below practical levels. Now, an ordered Cu–Pd bimetallic catalyst has been developed for selective electroreduction of CO to acetate at an industrially relevant activity.
Article
The predictable luminescent material design is always the holy grail for the scientists, especially for transition metal (TM) ions doped phosphors due to their high sensitivity to the crystal environments. In this perspective, driven by the photo spectroscopies data of TM ions from Sc to Zn (from atomic number 21 to 30) in diverse compounds from li...
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The nano-opto-electro-mechanical systems (NOEMS) are a class of hybrid solid devices that hold promises in both classical and quantum manipulations of the interplay between one or more degrees of freedom in optical, electrical and mechanical modes. To date, studies of NOEMS using van der Waals (vdW) heterostructures are very limited, although vdW m...
Article
To mitigate the total ionizing dose (TID) radiation impact, a new structure named double-silicon-on-insulator (DSOI) is introduced in this article. This new structure exhibits potential benefits of reducing the radiation-induced degradation effectively and independently, thanks to the additional electrode, which can be used to control the internal...
Article
Shrimp nursery rearing technology is increasingly being used by aquatic farmers and enterprises. Determining an appropriate density restriction in order to obtain a greater compensatory growth potential is the key to this technology. Based on the industry standards for indoor shrimp farming, three densities for Litopanaeus vannamei nursery rearing...
Article
Lithium–sulfur batteries are recognized as one of the most promising next-generation high-performance energy storage systems. However, obstacles like the irreversible capacity loss hinder its broad application. Herein, we fabricated an interconnected three-dimensional MoS2–MoN heterostructure (3D-MoS2–MoN) via a facile salt-template method, overcom...
Article
Single-atom nickel catalysts hold great promise in the application of electrocatalytic carbon dioxide reduction reaction (CO2RR), but suffer from the sluggish kinetics and serious competitive hydrogen evolution reaction (HER), which restrict their overall catalytic performance. Herein, we report a boron-bridging strategy to manipulate the atomic co...
Article
Regulating heteroatom substituted tetrahedral sites (T sites) within a zeolite crystal significantly influences the zeolite properties. Herein, the as-synthesized MFI zeolite with tailored boron location at various T sites is...
Article
At half-filled Landau level, composite fermions with chiral p-wave pairing will form Moore-Read state which hosts charge-e/4 fractional excitation, this excitation support non-Abelian statistics and have potential to enable topological quantum computation. Due to the SU(4) symmetry of electron and electric-field tunability, bilayer graphene become...
Article
Fe-based single-atom catalysts (SACs) have been recognized as attractive candidates for the oxygen reduction reaction (ORR). However, several limitations such as unsatisfactory intrinsic activity and poor stability hinder their practical applications, motivating further optimization of Fe-SACs which requires precise control of their composition and...
Article
Superconductivity has been a fascinating research field in condensed matter physics since its discovery in 1911. Nowadays, two-dimensional materials exhibit a variety of new physical phenomena, such as Ising superconductivity, topological superconductivity, and unconventional superconductivity. A number of two-dimensional van der Waals crystals giv...
Article
Lobar pneumonia is an inflammatory condition of the lung that mainly affects the lobes of the lungs and the alveoli, and it is usually caused by a bacterial infection. There are many ways to diagnosis this disease. But an early and accurate method for lobar pneumonia diagnosis has an important role in its treatment. Therefore, in this study, a comp...
Article
Electrical and optical properties deterioration of P-GaN films under 150 keV proton irradiation were investigated. Through the Hall measurement method, as the irradiation fluence increasing, the carrier concentration of P-GaN films decreases from 1.23 $\times \,\,10^{{17}}$ to $-8.24\,\,\times \,\,10^{{16}}$ cm <sup xmlns:mml="http://www.w3.org...
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Strong C–C bonds, nanoscale cross-section and low atomic number make single-walled carbon nanotubes (SWCNTs) a potential candidate material for integrated circuits (ICs) applied in outer space. However, very little work combines the simulation calculations with the electrical measurements of SWCNT field-effect transistors (FETs), which limits furth...
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A series of novel phosphors such as Ba2Mg(PO4)2: Ag⁺ (BMPO: xAg), Ba2Mg(PO4)2: Sm³⁺ (BMPO: ySm) and Ba2Mg(PO4)2: Ag⁺, Sm³⁺ (BMPO: 1%Ag, ySm) were prepared by solid-state reaction method. Phase structure and luminescent properties of Ba2Mg(PO4)2 were explored. It is shown that, under the excitation of 278 nm DUV light, a broadband emission peak cent...
Article
Low-energy proton irradiation effects on the optical properties and the molecular structure of phenyl-C 61 -butyric acid methyl ester (PCBM) are studied in this work. The PCBM films are irradiated by 100-keV proton beams with fluences of 5 × 10 ¹² p/cm ² , 5 × 10 ¹³ p/cm ² , and 5 × 10 ¹⁴ p/cm ² , respectively. The photoluminescence (PL) peaks of t...
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In this work, neutron irradiation effects on the optical property of multilayer MoS 2 have been investigated in depth. Our results display that the intensity of the photoluminescence (PL) spectra of MoS 2 flakes tends to slightly decrease after exposed to neutron irradiation with low fluence of 4.0 × 10 ⁸ n/cm ² . An unexpected improvement of PL in...
Article
In this paper, the electrical and ultraviolet optoelectronic properties of the interdigitated finger geometry β-Ga2O3 photodetector were investigated before and after 1 MeV electron irradiation. Under the dark condition, the voltage at which the minimum current was located shifted from 0 V to -9.5 V after the electron irradiation. As the fluence in...
Article
The endoplasmic reticulum (ER)-resident transmembrane protein kinase/RNase Ire1 is a conserved sensor of the cellular unfolded protein response and has been implicated in lipid homeostasis, including lipid synthesis and transport, across species. Here we report a novel catabolic role of Ire1 in regulating lipid mobilization in Drosophila. We found...
Article
Channeling carbon dioxide The separation of gas molecules with physisorbents can be challenging because there is often a tradeoff between capacity and selectivity. Zhou et al. report a template-free hydrothermal synthesis of the one-dimensional channel zeolite mordenite, in which some silicon was replaced by iron. Rather than forming a powder that...
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Full-text available
The endoplasmic reticulum (ER)-resident transmembrane protein kinase/RNase Ire1 is a conserved sensor of the cellular unfolded protein response and has been implicated in lipid homeostasis, including lipid synthesis and transport, across species. Here we report a novel catabolic role of Ire1 in regulating lipid mobilization in Drosophila. We found...
Article
Polymer coating post-treatment strategy of the zeolitic imidazolate framework (ZIF) membranes offers a versatile and feasible opportunity to restrict the intrinsic flexibility of ZIF framework and improve their gas separation performance. Herein, two different coating methods (Vacuum-assisted drip coating (VADC) and Static drip coating (SDC)) are u...
Article
Background Great achievements have been made in improving the power conversion efficiencies of solar cells. However, the price of photovoltaic (PV)-generated electricity still cannot compete with that of conventionally generated power. Thus, novel solar cells made from nontoxic, earth-abundant, and chemically stable materials are desirable to decre...
Article
C−N bond formation is crucial for the preparation of synthetic organic nitrogen‐containing heterocyclic compounds. This work provides a facile and highly efficient strategy (ca. ∼92 %) for the synthesis of quinazoline compounds, which involves tandem C−H/N−H bond functionalization using metal‐free conditions without the need for an external oxidant...
Article
Kesterite Cu2Zn1-xCdxSn(S,Se)4 (CZCTSSe) alloy thin films were fabricated by the water-based solution approach. The influence of Cd doping on the morphology, phase structure, element valence states, optical, electrical, and device performance were comprehensively examined. Cd was clearly alloyed into the Cu2ZnSn(S,Se)4 (CZTSSe) absorber layer to fo...
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Despite considerable efforts to prevent lithium (Li) dendrite growth, stable cycling of Li metal anodes with various structures remains extremely difficult due to the direct contact of the liquid electrolyte with Li. Rational design of solid‐electrolyte interphase (SEI) for 3D electrodes is a promising but still challenging strategy for preventing...
Article
We investigate the radiation effects of 1907 MeV Ta ions on the static and dynamic characteristics of 850 nm high-speed vertical cavity surface emitting lasers (VCSELs). The threshold current and slope efficiency are found to be degraded. However, appropriate ion fluence irradiation can improve the modulation bandwidth. The maximum 3dB frequency is...
Article
•Mg-bearing MTW silicalite zeolite, MgSi-ZSM-12, was straightforwardly synthesized by involving an unusual acidic pre-gelation system and engaged as the task-specific support for loading the Au nanoparticles (NPs). The resulting Au/MgSi-ZSM-12 catalyst showed stably excellent activity for the oxidation of HMF into FDCA in the presence of atmospheri...
Article
The green-emitting phosphor SrSi2O2N2: Eu²⁺, along with the cyan-emitting phosphor BaSi2O2N2: Eu²⁺, is a key component for phosphors used to package natural sunlight full-spectrum LED devices. Thereby, the synthesis of high-efficiency and thermal-stability luminous SrSi2O2N2: Eu²⁺ with an economic approach is very important for the development of L...
Article
The effects of proton irradiation on the electrical and optical properties of hybrid perovskite photodetectors have been investigated in this paper. Our results reveal that no significant changes in the photoelectric properties of the perovskite photodetectors are observed when the proton fluence accumulates to 1×1012 p/cm2. However, with further i...
Article
Polo-like kinase 1 (PLK1) is an essential cell-cycle regulator that is frequently overexpressed in various human cancers. To determine whether Plk1 overexpression drives tumorigenesis, we established transgenic mouse lines that ubiquitously express increased levels of Plk1. High Plk1 levels were a driving force for different types of spontaneous tu...
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Background Lung adenocarcinoma (LADC) is a major subtype of non-small cell lung cancer and has one of the highest mortality rates. An increasing number of long non-coding RNAs (LncRNAs) were reported to be associated with the occurrence and progression of LADC. Thus, it is necessary and reasonable to find new prognostic biomarkers for LADC among Ln...
Article
The use of nanoscale lasers in new space technologies can enable a variety of applications. Metal lead halide perovskites have emerged and been verified to possess many unique properties for optoelectronic applications, which are key elements for the space mission system. However, the basic knowledge of radiation damage of perovskite materials and...
Article
Recently, phosphors like lanthanide-ion-doped chloroapatite M5(PO4)3Cl (M = Ca, Sr, Ba) are successfully captured intensive investigations due to their potential applications in UV-LED and solid-state lasers devices. However, how to improve its luminescent efficiency or explore its potential applications are still a challenge so far. It is largely...
Article
Regarding the high stability of Ag3PO4 and CdWO4, their valence band and conduction band energy levels match each other, a novel p-n type Ag3PO4/CdWO4 heterojunction photocatalyst was synthesized by conventional hydrothermal strategy, and analyzed by PXRD, SEM TEM and XPS, respectively. The corresponding results suggested that the nanorods of CdWO4...
Article
Pursuing of the capabilities of predicting the luminescent properties of 3d ions doped phosphors before performing experimental exploitation is always a focus of experimental investigation, which is still suspended so far. As a tentative step in this work, we developed a simple relationship to predict the emission peak of Mn²⁺ only based on its thr...
Article
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To meet the industrial needs for SSZ-13, variable sizes of SSZ-13 with different Si/Al ratios were firstly obtained by conventional hydrothermal synthesis using the seed method. Using a set of characterizations, like X-ray fluorescence (XRF), X-ray diffraction (XRD), and scanning electron microscopy (SEM), the physicochemical structure and size dis...
Preprint
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Lung adenocarcinoma (LADC) is a major subtype of non-small cell lung cancer (NSCLC) and has one of the highest mortality rates. An increasing number of long non-coding RNAs (lncRNAs) were reported to be associated with the occurrence and progression of LADC. In order to find potential biomarkers for LADC therapies among lncRNAs, 2431 differentially...
Preprint
Full-text available
Background: Lung adenocarcinoma (LADC) is a major subtype of non-small cell lung cancer (NSCLC) and has one of the highest mortality rates. An increasing number of long non-coding RNAs (LncRNAs) were reported to be associated with the occurrence and progression of LADC. Thus, tt is necessary and reasonable to find new prognostic biomarkers for LADC...
Preprint
Full-text available
Background: Lung adenocarcinoma (LADC) is a major subtype of non-small cell lung cancer (NSCLC) and has one of the highest mortality rates. An increasing number of long non-coding RNAs (LncRNAs) were reported to be associated with the occurrence and progression of LADC. Thus, tt is necessary and reasonable to find new prognostic biomarkers for LADC...