Zn2+ doped ormosil–phosphotungstate hybrid films with enhanced photochromic response

摘要: Owing to the wide use of photochromic materials in UV sensors and dosimeters, considerable efforts have been made increase UV-response sensitivity existing classes materials. In this study, we report a simple sol–gel route for preparation highly transparent films based on ormosil–phosphotungstate hybrid The effect addition Zn2+ ions response these possible mechanism involved is discussed. Compared undoped samples, Zn2+-doped increases by 59–237 % depending concentration added sol formulation. No structural or electronic change phosphotungstate dye was observed vibrational spectroscopy spectroscopy, though micro X-ray fluorescence (μ-XRF) analysis showed that preparations leads an amount (HPW) incorporated dip-coated films. Furthermore, TEM nano-energy-dispersive formation nano-agglomerates consisting Zn HPW samples. K-edge absorption near edge structure also confirmed salt Hx[Zn(OH2)6] 2−xPW12O40. It suggested Zn-phosphotungstate get trapped into ormosil network during leading increased anions films, accordance with results from μ-XRF analysis. Raman Keggin preserved FTIR spectra matrix part samples are identical before after UV-irradiation, which suggests process does not involve oxidation organic functionalities. These promising candidates design practical UV-sensing devices dosimeters.