Erbium chloride hexahydrate

Unless otherwise stated, all reagents were purchased from commercial suppliers and used without further purification. Yttrium chloride hexahydrate (YCl₃·6H₂O, 99.99%), ytterbium chloride hexahydrate (YbCl₃·6H₂O, 99.98%), erbium chloride hexahydrate (ErCl₃·6H₂O, 99.9%), sodium hydroxide (NaOH, 98%), ammonium fluoride (NH₄F, 99.99%), oleic acid (OA, 90%), 1-octadecene (ODE, 90%), cyclohexane (C₆H₁₂, 99.5%), ethanol (CH₃CH₂OH, ≥99.5%), methanol (CH₃OH, 99.5%), dichloromethane (CH₂Cl₂, 99.8%), toluene (C₆H₅CH₃, 99.8%), dimethylformamide (DMF, 99.8%), 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC), N-hydroxysuccinimide (NHS), [3-(4,5-dimethylthazol-2-yl)-2,5-diphenyltetrazolium bromide] tetrazolium (MTT) and dimethyl sulfoxide (DMSO) were all purchased from Sigma–Aldrich and used as received without further purification. Pierce™ Streptavidin, EZ-Link^® Sulfo-NHS-LC-LC-Biotin, streptavidin-fluorescein isothiocynate (FITC) conjugate, goat anti-mouse IgG (H+L) secondary antibody, FITC conjugate and 2-(4-amidinophenyl)-1H-indole-6-carboxamidine (DAPI) were purchase from Thermo Fisher Scientific. PEG linker PO₄-PEG₅₀₀₀-COOH was synthesized and purchased from JenKem Technology USA Inc. Monoclonal antibody MIL-38 and prostate cancer cell lines DU145 and LNCaP were all provided by Minomic Int. Ltd.

The lanthanides (99.99%), consisting of ytterbium chloride hexahydrate (YbCl₃⋅6H₂O), gadolinium chloride hexahydrate (GdCl₃⋅6H₂O), yttrium chloride hexahydrate (YCl₃⋅6H₂O), and erbium chloride hexahydrate (ErCl₃⋅6H₂O), were obtained from Sigma-Aldrich (St. Louis, MO, USA). 1-octadecene (>90%), methanol (99%), ethanol (99%), cyclohexane (99%), O-phosphorylethanolamine (AEP) (97%), oleic acid (>90%), CHCl₃, HCl, NH₄F, NaOH, MB, and Luria-Bertani (LB) broth were obtained from Alfa Aesar (Shanghai, China). The TIANamp bacterial genomic DNA kit for DNA extraction was obtained from TIANGEN BIOTECH (Beijing, China). The Taq Master Mix was obtained from Vazyme Biotech Co., Ltd. (Nanjing, China). The DNA primers selected for PCR amplification were obtained from Sangon Biotechnology Co., Ltd. (Shanghai, China) and are described in Table S1.