Tetraethylorthosilicate

4-Hydroxybutyl acrylate (HBA, refractive index n (20^oC): 1.452), poly(ethylene glycol) diacrylate (PEGDA) (average Mn = 250 g·mol⁻¹, n (20^oC): 1.457), ammonia (28 vol%), 2-hydroxy-2-methylpropiophenone (photoinitiator), 1,6-hexanediol diacrylate (HDDA), and benzenesulfonic acid (BZSA, transesterification catalyst) were purchased from Aladdin Co. (Shanghai, China). Tetraethylorthosilicate (TEOS, 99.5%), 2-hydroxyethyl methacrylate (HEMA, 99%, n (20^oC): 1.441), tetrahydrofuran (THF, 99.8%, anhydrous), and ethanol (AR, ≥ 99.8%) were purchased from J&K (Beijing, China) and Aladdin Reagent Co. (Shanghai, China). Ethyl decanoate (98%) was brought from Tansoole (Beijing, China). All reagents and solvents were used without further purification. Ultrapure water (18.25 MΩ·cm, 25 °C) was used. The peacock feathers were purchased from a Taobao store (OPAI diy) and photographed by the author. The image of the peacock were taken by the author at the farm in Chengdu.

QCA (95%) was purchased from Adamas Reagent Co., Ltd., Shanghai, China. Olaquindox (QLA; 99%), and carbadox (CBX; 98.5%) was purchased from Dr. Ehrenstorfer GmbH Co., Ltd., Augsburg, Germany. Mequindox (MEQ; 99.6%) was purchased from the Institute of Veterinary Drug Control, Beijing, China; 3-Methylquinoline-2-carboxylic acid (MQCA; 95%) was purchased from Aladdin Bio-Chem Technology Co., Ltd., Shanghai, China. CdSe/ZnS QDs with 460 nm excitation and 605 nm fluorescence emission were purchased from Jiayuan (Wuhan, China); 1,3,5-triformylphloroglucinol (TP; 99%) was purchased from Strem Chemicals, Inc., Newburyport, MA, USA. P-phenylenediamine (Pa) and mesitylene (99%) were purchased from Shanghai Macklin Biochemical Co., Ltd., Shanghai, China; 3-Aminopropyl triethoxysilane (APTES; 98%), acetic acid (99.5%), Triton X-100 (99.5%), and cyclohexane (99.5%) were purchased from Sinopharm Chemical Reagent Co., Ltd., Beijing, China. Dioxane (99.5%) and tetraethyl orthosilicate (TEOS; 98%) were purchased from J&K Scientific Ltd., Beijing, China. Doubly de-ionized water (DDW; 18.2 MΩ cm⁻¹) was obtained from a Water Pro water purification system (Labconco, Kansas City, MO, USA).