Table 3.

Apparent overlayer thickness for C_x COOH-SAMs on flat Au and AuNP measured from XPS data acquired in the ‘hybrid’ and electrostatic modes at a nominal photoelectron take-off angle of 0°. The COOH-SAM thicknesses from the literature are also included in the table.⁵⁰

AuNP Diameter [nm]	COOH-SAM Chain Length	dH [Å] (Std. Dev.)	dE [Å] (Std. Dev.)	dL (Å)
	6	18 (5)
14	8	24 (1)
	11	30 (4)
	16	41 (2)	36
25	16	37 (1)
40	16	35 (1)
	6	14 (2)	12 (1)	11
Flat Au	8	16 (1)	13 (1)	13
	11	20 (1)	17 (3)	16
	16	28 (1)	21 (1)	22

d_H = d based on hybrid mode data

d_E = d based on electrostatic mode data

d_L = d based on literature