Dr. GOH Guo Liang
Nanyang Technological University
Guo Liang’s interest is in additive manufacturing, or 3D printing, for printed electronics, focusing on studying the printing process, the formation of thin-film, assembly of nanomaterials and characterization of electronics devices etc. He is actively involved in inter-disciplinary research and innovations.
He completed his Ph.D. research in Mechanical Engineering, in 2020 from Nanyang Technological University, Singapore. His research focuses on Aligning Carbon nanotubes via Aerosol Jet Printing for Flexible Electronics. His research involves the fabrication of devices such as strain sensor, pH sensor, antenna, and circuits etc.
In 2015, he graduated with a Bachelor's degree in Aerospace Engineering (Honours), also from Nanyang Technological University, Singapore, specializing in Aircraft Reliability & Maintainability and Autonomous Unmanned Aerial Vehicle (UAV).
Directed and On-Demand Alignment of Carbon Nanotube for 3D Printing of Electronics
Carbon nanotubes (CNTs) are one-dimensional nanostructured materials with unique mechanical, optical, and electrical properties which can be potentially exploited for fabricating wide variety of devices. In addition, the biocompatibility of CNTs makes it attractive for wearable and implantable technology applications. Well-aligned CNTs structures show enhanced properties such as superior electron mobility, strain sensitivity, better mechanical property and enhanced performance and reproducibility that are absent in their disordered counterparts, thus allowing more promising applications in various fields. With aligned CNTs, devices can be optimized to exhibit better performance with lesser materials and more miniature designs.
Sessile droplets containing carbon nanotubes: a study of evaporation dynamics and CNT alignment for printed electronics
Carbon nanotubes (CNTs) are 1-dimensional (1D) and flexible nanomaterials with high electric conductivity and a high aspect ratio. These features make CNTs highly suitable materials for the fabrication of flexible electronics. CNTs can also be made into dispersions which can be used as the feedstock material for droplet-based 3D printing technologies, e.g., inkjet printing and aerosol jet printing to fabricate printed electronics. These printing techniques involve several physical processes including deposition of ink droplets on flexible polymeric substrates such as polyimides, evaporation of the solvent and formation of thin films of CNTs, all of which have not been thoroughly investigated. Besides, alignment of the CNTs in the resultant thin films dictates their electrical performance. In this work, we examine the effect of substrate temperature and CNT concentration on the evaporation dynamics and also the alignment in the deposition patterns. Evaporation-driven self-assembly of CNTs and their preferential alignment are observed. Image analysis and Raman spectroscopy are utilised to evaluate the degree of alignment of the CNT network. It is found that the contact line dynamics depends greatly on the CNT concentration. Besides, the substrate temperature plays a significant role in determining the order of the CNTs in the drying deposition pattern. Our findings show the possibility of controlling the film morphology and the degree of alignment of CNTs for printed electronics in the printing process.