Academic Profile : Faculty

Alfred Tok Iing Yoong.jpg picture
Assoc Prof Alfred Tok Iing Yoong
Associate Professor, School of Materials Science & Engineering
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Associate Professor Alfred Tok leads the Nanomaterials Group that focuses on the Synthesis & Processing of Nanomaterials (rare earth / graphene / functionalized nanoparticles) and Fabrication of Nanostructures (atomic layer deposition, self-assembly etc), for Applications in (1) Clean Energy / Sustainable Earth (2) Defence (3) Molecular Sensors (4) Sports Materials.
1) Synthesis of Nanostructured Materials using Atomic Layer Deposition (ALD)

Atomic layer deposition (ALD) has evolved to be a unique tool for nanotechnology with atomic level control of the depositions, 3D conformity and homogeneity. Film depositions can be realised for complex non-planar topographies for a wide range of applications such as energy conversion and storage, nanoparticle catalysts, nanostructures for drug delivery, gas separations, sensing, and photonic applications. Our group focuses on ALD materials for applications in solar cells, hydrogen generation, batteries and electrochromic smart window applications.

2) Energy Thrust Program

In accordance with the objectives of the Energy Thrust Program of the NRF-CREATE Project, our group is focused on the design and synthesis of highly functional nanomaterials, which enables energy harvesting and conservation. Recently, novel graphene oxide synthesized nanoballs and nanoflowers were synthesized. These exhibit potentials for supercapacitors and energy applications. In general, these activities results in above 50 publications, 17 patent applications and projects discussions with companies regarding commercialization possibilities.

3) Hard & Tough Materials for Ballistic Protection Application

The next generation of military vehicular and soldier system requires light-weight materials with high strength-to-weight ratio. Our research focuses on the synthesis and densification of nanostructured materials & desired composite architecture to significantly raise the ballistic protection capability. The B-C-N-O group of compounds are potential candidates to form novel materials for ballistic protection application as they inherent the unique properties from both boron nitride and boron carbide which are known for their light weight, high hardness, low friction coefficient and high wear resistance. Prof Tok leads a team of collaborators in armour material research ranging from high temperature synthesis of novel superhard materials and consolidation by state-of-the-art Spark Plasma Sintering to advanced characterisation techniques such as depth of penetration test using Two-Stage Light-Gas Gun.

4) Carbon-based Molecular Sensors

Our group develops and studies various carbon-based nanomaterials like graphene, carbon nanotubes, carbon quantum dots etc for improving the sensitivity and selectivity of chemical and biological sensors (lateral flow, stack pad, field effect transistor and surface plasmon resonance). Applications include stroke triaging, athlete performance and doping and food security.

Our group capitalizes on this emergent market and researches on disposable and low-cost sensor suitable for real-time sensing in field conditions. Various sensor technologies developed include stroke, chemical, biomarker tions.

5) Institute for Sports Research

Our group is involved in the Institute for Sports Research, working on the damping property of midsoles which is based on carbon nanotube (CNT). CNT’s high aspect ratios (length/diameter) is particularly desirable for mechanical reinforcement, and it is found that the vertical aligned (VA)CNTs perform well in damping, to dissipate the energy absorbed under compression (Figure 7). Our present job is to tune the damping property of VACNT by adjusting the length, diameter and area density etc. parameters and try to reinforce the polymer with VACNT to fabricate midsole material with better cushion property.
  • Atomic Layer Deposition of High-Entropy Alloy 2D and 3D Coatings for Multifunctional Applications
  • Composite Reporter-Based Lateral Flow Immunoassay For Detection Of Substance Abuse In Athletes
  • Development of Fabric Material to Improve Blood Circulation in the Limbs of the Elderly
  • Negative capacitance transistor for flexible and wearable electronics
  • Project 6 - Novel High Sensitivity Robotic Grips Soft Piezoelectric/Piezoresistive Sensor with 3D-Architecture