Cetyltrimethylammonium chloride solution

All chemicals were purchased
and used without further purification.
Propan-2-ol (C₃H₈O, ≥99.5%), ethanol
(EtOH, ≥99.8%), methanol (MeOH, ≥99.5%), acetone (C₃H₆O, ≥99.5%), and hydrochloric acid (HCl,
37.0%) were purchased from VWR. Nitric acid (HNO₃, ≥65%),
sodium hydroxide pellets (NaOH, ≥98.0%), sodium borohydride
(NaBH₄, ≥97%), and l(+)-ascorbic acid (AA,
≥99%,) were purchased from Carl Roth. Hydrogen tetrachloroaurate
trihydrate (HAuCl₄·3H₂O, ≥99.9%),
hexadecyltrimethylammonium bromide (CTAB ≥99%), cetyltrimethylammonium
chloride solution (CTAC, 25 wt % in H₂O), hexadecylpyridinium
chloride monohydrate (CPC, 99.0–102.0%), (3-aminopropyl)triethoxysilane, N,N-diisopropylethylamine (DIPEA), and
poly(sodium 4-styrenesulfonate, M_w of
70000 g/mol) were purchased from Sigma-Aldrich. 3-(Triethoxysilyl)propylsuccinic
anhydride, 3-acetoxypropyltrimethoxysilane, n-butyltriethoxysilane, and heptadecafluoro-1,1,2,2-tetrahydrodecyl)triethoxysilane
were purchased from abcr. (α-Thiol, ω-bromo)-terminated
poly(acrylic acid) (PAA-SH, M_w of 8500
g/mol) was purchased from Polymer Source Inc. Mica sheets were obtained
from Micro to Nano with different shapes and a thickness of 0.15 to
0.21 mm and the highest grade V-1 quality. Double-polished Si wafers
(orientation [100] of 5 mm length and 7 mm width) from Siegert Wafer
were used for ellipsometry measurements. Milli-Q water (18.2 MΩ·cm)
was used in all experiments.

Gold(III) chloride trihydrate (≥ 99.9%, HAuCl₄ · 3H₂O), chloroplatinic acid hexahydrate (≥ 37.50% Pt, H₂PtCl₆ · 6H₂O), sodium borohydride (≥ 98.0%, NaBH₄), cetyltrimethylammonium bromide (≥ 98%, CTAB), cetyltrimethylammonium chloride solution (25 wt.% in water, CTAC), L-Ascorbic acid (≥ 99%, AA), sodium hydroxide (NaOH) and dysprosium(III) chloride hexahydrate (≥ 99.9%) were purchased from Sigma-Aldrich (Zwijndrecht, the Netherlands). 90% enriched dysprosium-164 oxide powder (¹⁶⁴Dy₂O₃) was obtained from Oak Ridge National Laboratory (sample number 122502, ORNL, Tennessee, USA). Ethylenediaminetetraacetic acid disodium salt dihydrate (Na₂EDTA · 2H₂O), Diethylenetriamine pentaacetate (DTPA), hydrochloric acid (HCl, 30%, Suprapur®) and nitric acid (HNO₃, 69%, Supelco®) was supplied by Merck. All chemicals were used as received without further purification. MiliQ water was obtained from an in-house MiliQ system (Millipore) and used throughout this study.

(S)-(+)-Camptothecin (CPT ≥ 90%), human holo-Transferrin (Tf, ≥98%), tetraethyl orthosilicate (TEOS, 98%), (3-aminopropyl)triethoxysilane (APTES, ≥98%), cetyltrimethylammonium chloride solution (CTAC, 25 wt.%), ammonium hydroxide solution (acs reagent, 28–30%), and glutaraldehyde solution (GLUT, 25 wt.%), were purchased from Sigma-Aldrich. Ethanol (EtOH, HPLC grade), dimethyl sulfoxide (DMSO, for analysis), and hydrochloric acid (HCl, ACS reagent, fuming, 37%) were obtained from Merck. All other reagents and solvents were of analytical grade. Deionized water (Milli-Q, 18.2 MΩ·cm) was used in all experiments. All materials were used without any further purification.