Supporting information for Tuning NIR photoabsorption of CuWO4-x nanodots with oxygen vacancies for CT imaging guided photothermal therapy of tumors

Copper (II) Chloride Dihydrate (CuCl2·2H2O), sodium tungstate dehydrate (Na2WO4·2H2O) and, trisodium citrate were purchased from Sinopharm Chemical Reagent Co., Ltd (China). Acetone and ammonia solution (NH3·H2O) were obtained from Shanghai Lingfeng Chemical Reagent Co., Ltd. 1.2 Characterization Transmission electron microscopy (TEM) was used to detect the size and morphologies of CuWO4-x nanomaterials. UV-vis-NIR absorption spectrum were recorded by Shimadzu UV-3600. Bruker D4 was used to record the data of X-ray diffraction measurements (XRD). ICP-AES (Prodigy; USA) was used to measure the concentration of CuWO4-x dispersion. Meanwhile, the photothermal ability of CuWO4-x