Synthesis, Optical, and Magnetic Properties of Graphene Quantum Dots and Iron Oxide Nanocomposites

Figure 4

Experimental magnetization curves of Fe₃O₄ powder (a), GQDs (b), and GQD-Fe₃O₄ NC (c) while (a′), (b′), and (c′) panels correspond to fitting curves using (2). (d, d′) direct comparison and fitting data showing magnetic properties of reference Fe₃O₄ powder data (curve 1), GQD-Fe₃O₄ composite (curve 2, data factorized with factor 40), and pure GQD (curve 3, data factorized with factor 800).

(a)

(a′)

(b)

(b′)

(c)

(c′)

(d)

(d′)