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. 2022 Feb 16;12(9):5557–5570. doi: 10.1039/d1ra05717k

Fig. 3. Mechanical properties of RGO-CPCs. (A) Mechanical properties (elastic modulus, maximum allowable strain, and maximum compressive stress) of RGO-CPCs immediately after fabrication. Elastic modulus and maximum compressive stress of 0.1 and 1% RGO were significantly enhanced and the maximum allowable strain of all RGO-CPCs was increased compared to No RGO. (n = 10, LSD) (B) XPS results. C 1s peaks of 1% RGO representing C–C, C–O, C Created by potrace 1.16, written by Peter Selinger 2001-2019 O, and O Created by potrace 1.16, written by Peter Selinger 2001-2019 C–O bonding increased compared to No RGO. Whereas, an O 1s peak representing O–H bonding decreased, indicating covalent bonding may occurred. (C) Possible mechanism of RGO-CPCs. Covalent bonding between HA, CS, and RGO as well as high mechanical properties of RGO would result in the reinforcement of mechanical properties. XPS: X-ray photoelectron scopy, HA: hydroxyapatite, CS: chitosan.

Fig. 3