Professor Yap is interested in the fundamentals of synthesis, characterization, and applications of quantum materials and nanomaterials, including B-C-N nanostructures (carbon, boron nitride, boron carbon-nitride, carbon nitride, boron, etc); Transition metal dichalcogenides (TMDCs); and ZnO. In addition to basic research, his research group is dedicated to creating broader impacts on people, health, the environment, and renewable energy harvesting. Professor Yap has edited multiple books, Material Research Society proceedings volumes, and journal special issues. His group has published a series of book and encyclopedia chapters, as well as more than 150 peer-reviewed articles.