Summary of XPS atomic analysis results. Values presented in the table are atomic percent of the total composition.

	C	O	Si	N	S	Other	C/O
Glass	6.94	60.85	26.22	—	—	5.99	0.111
TESBA	23.79	48.8	22.96	—	—	4.45	0.491
MPTES	44.08	25.91	19.66	—	8.04	2.31	1.701
MAPTES	23.30	51.64	22.80	—	—	2.26	0.451
BTES	20.01	50.01	24.83	—	—	5.16	0.401
DTES	38.88	37.25	19.44	—	—	4.43	1.041
APTES	48.57	22.64	13.19	11.89	—	3.71	2.151