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Table 2 Surface atomic composition of magnetite nanoparticles as determined by high resolution XPS, at a take off angle of 45°

From: Grafting of Poly(methyl methacrylate) Brushes from Magnetite Nanoparticles Using a Phosphonic Acid Based Initiator by Ambient Temperature Atom Transfer Radical Polymerization (ATATRP)

Element Magnetite Magnetite with a monolayer of a ATRP initiator Magnetite with a monolayer PMMA
C1s 61.3 40.6 63.5
O1s 34.2 43.5 32.0
P2p 1.3 0.8
Fe2p 4.3 13.7 2.0
Br3d 0.9 0.4