Fig. 4From: Plant-based nano-fertilizer prepared from Paulownia Tomentosa: fabrication, characterization, and application on Ocimum basilicumHigh-resolution XPS for NFP, (1) survey spectrum, (2) C 1Â s, (3) O 1Â s, (4) N 1Â s. The NFP were casted on silicon substrateBack to article page