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FACTS Art of Science 2023
1st Prize: “Atomic whirlpools” in a moiré interface
Submitted by: Xiangbin Cai, Assoc Prof Weibo Gao (Supervisor)
School/Centre: School of Physical and Mathematical Sciences
Model of Equipment: TEM ARM 300F
Description: Atomic-resolution STEM ADF imaging was used to characterize the moiré superlattice formed in the MoS2/WSe2 hetero-bilayer, which was fabricated by mechanically transferring and stacking respective monolayers. Certain atomic registry is energetically favored, thus expanding with local rotation to compensate the lattice mismatch, just like atomic whirlpools! These hexagonally packed sites are key to the charge-filling-dependent interlayer excitons.
2nd Prize: Cross-sectional STEM for WS2 homostructure
Submitted by: Zhou Xin, Assist Prof. Song Peng (Supervisor), Prof. Liu Zheng (Co-supervisor)
School/Centre: MSE
Model of Equipment: TEM ARM 200F
Description: Cross-sectional STEM for WS2 homostructure, by ARM200F at 200 kV. The sample was mechanical exfolicated, prepared and examined by Zhou Xin, from Prof. Liu Zheng and Prof. Song Peng’s group.
3rd Prize: Periodic repetition of crystallographic texture (in red) along {0001} crystallographic plane in polycrystalline aluminium oxide (Al2O3) ceramics in the x and y viewing direction
Submitted by: Rohit Pratyush Behera, Assist Prof Hortense Le Ferrand (Supervisor)
School/Centre: MAE
Model of Equipment: FESEM 7800F
Description: Inverse pole figure mapping of bioinspired Al_2 O_3 polycrystalline grains fabricated using Magnetic assisted slip casting. Such periodic arrangement in crystallographic texture is found in biological animals such as the mantis shrimp, which allows them to exhibit periodic repetition of properties for high energy dissipation and interesting optical and functional applications.
Fatigue crack-arrest by dynamic recrystallization (DRX)
Submitted by: Jayaraj Radhakrishnan, Prof. Upadrasta Ramamurty (Supervisor)
School/Centre: MAE
Model of Equipment: FESEM 7800F
Description: BSE/EBSD was employed to find DRX in the vicinity of lack of fusion pores of IN718 fabricated by laser beam powder bed fusion and subjected to cyclic loading at 600degC. After crack initiation, crack-path deviated around these newly nucleated fine grains (which were otherwise absent before test) and increased fatigue resistance. This could improve the life of turbine blades and delay failure in aeroengines.
The inverse pole figure of Fe-3.5wt%Si@SiO2 nanocomposite fabricated via laser powder bed fusion
Submitted by: Xiaojun Shen, Assist Prof Christopher H.T. Lee (Supervisor)
School/Centre: EEE
Model of Equipment: FESEM 7800F
Description: This image is acquired by an EBSD detector (symmetry, Oxford instrument, UK) equipped on a Field Emission Scanning Electron Microscopy (FESM, JEOL Model 7800, Japan). By adding high resistivity SiO2, Fe-3.5wt%Si@SiO2 was additively manufactured via laser powder bed fusion technique for electric motor application to reduce eddy current loss.
EBSD of helicoidal microstructure under compressive deformation
Submitted by: Crystal Ji, Prof Bartolo (Supervisor)
School/Centre: MAE/SC3DP
Model of Equipment: FESEM 7800F
Description: The sample was made by laser powder bed fusion technique. By modifying the scan strategy, we are able to achieve this gradient material with distinctive microstructure. This image is captured by EBSD, after sample has undergo 30% strain compression.
Hairs on a bee's wing
Submitted by: Quentin Perrin, Prof Ali Miserez (Supervisor)
School/Centre: MSE
Model of Equipment: FESEM 6340F
Description: LEI imaging of a bee's wing. This illustrates the Salvinia effect in nature, keeping a permanent layer of air between the microscopic hair for better hydrophobicity and aerodynamics. Biomimetic applications of this effect reduce drag in cargo ships, reducing fuel consumption. This sustainable solution can therefore avoid conventional polluting coatings.
Akin to a soap sponge on the surface but with filled pores like a layered cake
Submitted by: Nupur Gupta, Prof. Hu Xiao (Supervisor)
School/Centre: MSE
Model of Equipment: FESEM 7600F
Description: The image represents a cross-section of the poly N-isopropyl acrylamide/ poly sodium acrylate semi-IPN hydrogel with a polyamide layer on its surface (https://pubs.acs.org.remotexs.ntu.edu.sg/doi/full/10.1021/acsami.1c16639). The hydrogel sample was lyophilized and sputter coated before observing under FESEM 7600 in SEI mode. The image resembles akin to a soap sponge on the surface, but with filled pores like a layered cake. The material was synthesized by me.
Cross-sectional STEM for SnS/WS2 superlattice
Submitted by: Zhou Xin, Assist Prof. Song Peng (Supervisor), Prof. Liu Zheng (Co-supervisor)
School/Centre: MSE
Model of Equipment: TEM ARM 200F
Description: Cross-sectional STEM for SnS/WS2 superlattice, by ARM200F at 200 kV. The sample was prepared and examined by Zhou Xin, from Prof. Liu Zheng and Prof. Song Peng’s group.
Tungsten Selenide Cross-section
Submitted by: Wu Yao, Assoc Prof. Li Shuzhou (Supervisor), Prof. Liu Zheng (Co-supervisor)
School/Centre: MSE
Model of Equipment: TEM ARM 200F
Description: The 2H phase tungsten selenide (WSe2) cross-section was imaged using the aberration-corrected HAADF-STEM. The intralayer abc stacking sequence and interlayer AA' sequence of W and Se atoms could be seen clearly from the image.
Twisted Molybdenum Disulfide
Submitted by: Wu Yao, Assoc Prof. Li Shuzhou (Supervisor), Prof. Liu Zheng (Co-supervisor)
School/Centre: MSE
Model of Equipment: TEM ARM 200F
Description: Bilayer molybdenum disulfide with a twisted angle was imaged using an aberration-corrected HAADF-STEM. Due to interlayer rotation, the material exhibits significant moire superlattices. This moire superlattice has become a hot spot in semiconductor physics, potentially applied in superconductive materials and new electronic devices.
Atomic-resolution aberration-corrected HAADF-STEM image of flame-synthesized TiO2-x under 15 min calcination
Submitted by: Wu Shuyang, Dr Zhang Zhengyang (Supervisor)
School/Centre: School of Chemistry, Chemical Engineering and Biotechnology
Model of Equipment: TEM ARM 200F
Description: Blue TiO2-x with controllable defect content and location is fabricated by the one-step and solvent-free flame synthesis method. The TiO2-x with 15 min calcination time (TiO2-x-15 min) contains multiple types of defects including bulk defects, stepped surface and stacking faults. It shows remarkable photocatalytic activities in H2 generation, CO2 reduction and pollutant degradation.
h0l precession image of imidazolium lead bromide at 220 K revealing a rare 4-fold superstructure combined with threefold twinning
Submitted by: Walter Wong, Assoc Prof Andrew Grimsdale (Supervisor)
School/Centre: MSE
Model of Equipment: XRD Bruker Smart Apex II
Description: Single crystal XRD was carried out on imidazolium lead bromide at 220 K. This h0l precession image shows the presence of satellite peaks revealing a rare 4-fold superstructure. The apparent hexagonal shape is a result of threefold twinning (i.e. 3 domains at 60° apart). Sample were made by myself.
1st Prize: Drug delivery to cells using coacervates
Submitted by: Quentin Perrin, Prof Ali Miserez (Supervisor)
School/Centre: MSE
Model of Equipment: FESEM 7600F
Description: SEI imaging of a liquid droplet being captured by a cell. Sample fixed using paraformaldehyde and prepared by Critical Point Drying. The novel drug delivery platform was developed in NTU in Prof Ali Miserez BBML Laboratory. Cells were prepared in collaboration with Anastasia Shebanova to uncover the cell uptake mechanism.
2nd Prize: SEM image of scientific research of the flying bird
Submitted by: XIU MINGZHEN, Assoc Prof Huang Yizhong (Supervisor), Prof Xu Rong (Co-supervisor)
School/Centre: IGS-ERI@N
Model of Equipment: FESEM 7600F
Description: The sample is spinel FeNi2O4, made using a laser irradiation process, and used in an application as a catalyst in a water-splitting reaction. The FeNi2O4 nanoparticles are growing on the carbon cloth substrate; a large piece is falling off and being captured by FESEM in SEI mode. The owner of the sample is Li Qixiang, an MSE Year 3 student.
3rd Prize: Schwann cell: Wrapping nerves with love"
Submitted by: Archana Gautam, Professor Ng Kee Woei (Supervisor)
School/Centre: MSE
Model of Equipment: Libra 120 kV
Description: The image was captured using a Libra 120kV TEM. A Schwann cell in the dermis of the human skin surrounds myelinated axons of peripheral neurons. Myelin-red; Axons-yellow; Mitochondria-purple; Cytoplasm-green; Collagen bundles-black dots. The skin biopsy was fixed and processed, then embedded in resin. Thin sections measuring 70 nm were cut using a Leica Ultramicrotome and placed on copper grids for imaging.
Artificial Intelligence (AI) Robot of Molybdenum Telluride
Submitted by: DENG YA, Prof. Liu Zheng (Supervisor)
School/Centre: MSE
Model of Equipment: FESEM 7600F (TED/EBL)
Description: The Image was taken using by SEM-SEI technique, and the object is NaCl-assisted synthesized MoTe2 flakes. The bright particles in the center area are salt which is widely used for our 2d materials synthesis. This image resembles an Artificial Intelligence (AI) robot, which also indicates the possibility of AI-assisted material synthesis in the future. The sample is prepared and photographed by Deng Ya.
A blooming microscopic world
Submitted by: Ye Kai, Assoc Prof Aravind Dasari (Supervisor)
School/Centre: MSE
Model of Equipment: FESEM 7600F (TED/EBL)
Description: This is a SEI micrograph of the graphite electrode from a lithium-ion battery when exposed to atmospheric conditions. The flower-shape morphology was formed during its decomposition when exposed to moisture and oxygen in air. A beautiful ending for a beautiful material.
The Bamboo Forest
Submitted by: Rodney Chua Yong Sheng, Prof Madhavi Srinivasan (Supervisor)
School/Centre: Energy Research Institute @ NTU
Model of Equipment: FESEM 7600F
Description: This piece of “Bamboo Forest” inspired art is a scanning electron micrograph of a green cathode material deposited onto carbon fibres via the facile hydrothermal method for high-performance energy storage applications.
ZnO Nanoflower Field
Submitted by: Ronn Goei, Assoc. Prof. Alfred Tok (Supervisor)
School/Centre: MSE
Model of Equipment: FESEM 7600F
Description: ZnO nanoflower field - prepared by growing ZnO hydrothermally onto glassy carbon electrode. The ZnO will be used as a piezoelectric sensor materials for soft robotic gripper application.
Fern leaves
Submitted by: Nguyen Linh Lan, Prof. Lam Yeng Ming (Supervisor)
School/Centre: MSE
Model of Equipment: Zeiss Crossbeam X540
Description: Perovskite crystals after being spin coated and annealed on a glass substrate resembling fern leaves. The material was synthesized from one-step spin coating techniques of precursor solution consisting of equimolar MAI and PbI2. The material is expected to have favourable optoelectronic properties for LED application.
When Fall Arrives
Submitted by: Tso Shuen, Prof Alex Yan (Supervisor), Dr. Xu Jian Wei (Co-supervisor)
School/Centre: MSE
Model of Equipment: FESEM 7600F (TED/EBL)
Description: SEI from SEM 7600F was used. This image shows the forest ground when fall arrives. In the middle is antimony sulfide that is used as anode of sodium battery. It resembles as the last two petals fallen from the tree. There is a carbon nanotubes cluster at the upper part of the image as a pinecone. Surrounding graphene flakes resemble as wood chips and rocks with green moss covering their edges. This sample belongs to Zhao Wenqing.
Spider book lungs
Submitted by: Quentin Perrin, Prof Ali Miserez (Supervisor)
School/Centre: MSE
Model of Equipment: FESEM 7600F
Description: SEI imaging of a spider’s lung prepared by Critical Point Drying. Let’s take a break from everyday life and think about how spiders breathe. Each page of the spider “book lungs” is itself a fibrous structure maximizing surface area. This hierarchical structure inspire biomimetic applications for composites or battery electrodes.
Diving into the microverse
Submitted by: Quentin Perrin, Prof Ali Miserez (Supervisor)
School/Centre: MSE
Model of Equipment: FESEM 7600F
Description: SEI imaging of a bird feather. Nature’s hierarchical structures are mesmerizing. Scanning Electron Microscopy enables might be the best technique to observe this beauty through its multiple scales. To dive into the microverse! Its wonders go well beyond these visuals. Biomimicry opens new avenues for engineering high performance hierarchical materials.
Kaleidoscope
Submitted by: Wu Yao, Assoc Prof. Li Shuzhou (Supervisor), Prof. Liu Zheng (Co-supervisor)
School/Centre: MSE
Model of Equipment: TEM ARM 200F
Description: We use the chemical vapor deposition (CVD) method to prepare a non-layered ferric oxide (Fe2O3) material into a two-dimensional structure. The atomic resolution image under ARM200F of this material shows a beautiful pattern with six-fold symmetry, like graphics in a kaleidoscope.
Getting on a camel while horse watches
Submitted by: Pritish Mishra, Assist Prof. Kedar Hippalgaonkar (Supervisor), Prof. Tze Chien Sum (Co-supervisor)
School/Centre: IGP-ERI@N
Model of Equipment: TEM 2100F
Description: HAADF- STEM image taken by JEOL 2100-A of CsPbBr3 Perovskite quantum dots. The material is highly luminescent.