1. Micro and Nano Innovations Laboratory, Department of Physical Sciences, College of Science, University of the Philippines Baguio, Baguio City 2600, Philippines
2. Department of Physical Sciences, College of Science, University of the Philippines Baguio, Baguio City 2600, Benguet, Philippines
3. Department of Materials Science and Engineering, Mariano Marcos State University, Batac City 2906, Ilocos Norte, Philippines
4. Fullerene Engineering Group, Materials Processing Unit, Advanced Key Technologies Division, National Institute for Materials Science, Sengen, Tsukuba, Ibaraki 305-0047, Japan