**Author details**

Gregory Thien Soon How1,2, Mohd Arif Mohd Sarjidan1 , Boon Tong Goh1 \*, Boon Kar Yap3,4 and Eyas Mahmoud5

1 Low Dimensional Materials Research Center, Faculty of Science, Department of Physics, Universiti Malaya, Kuala Lumpur, Malaysia

2 Centre for Advanced Devices and Systems, Faculty of Engineering, Multimedia University, Cyberjaya, Selangor, Malaysia

3 Electronic and Communications Department, College of Engineering, Universiti Tenaga Nasional, Kajang, Selangor, Malaysia

4 Institute of Sustainable Energy, Universiti Tenaga Nasional, Kajang, Selangor, Malaysia

5 Department of Chemical and Petroleum Engineering, United Arab Emirates University, Al Ain, United Arab Emirates

\*Address all correspondence to: gohbt@um.edu.my

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