Carbon nanoparticles assisted energy transport mechanism in leaves: A thermal lens studyM. S. Swapna, Vimal Raj, H. V. Saritha Devi, P. M. Radhamany and S. SankararamanEur. Phys. J. Plus, 134 8 (2019) 416DOI: https://doi.org/10.1140/epjp/i2019-12780-1