Structural and optical characterization of Zn(OH)_2and its composites with graphite oxides

Abstract

The optical properties of zinc (hydr)oxide and its porous composites with 2% and 5% graphite oxide (GO), thus forming ZnGO-2 and ZnGO-5, are investigated using reflectance spectroscopy and two-photon fluorescence (TPF) imaging. The bandgap energies for the Zn(OH)(2), ZnGO-2, and ZnGO-5 samples are determined to be in the range between 2.88 and 3.60 eV. The size of light-emitting regions (~from 4.5 to 45 μm) and pore size (~from 20 to 255 μm) are measured using the TPF imaging technique.

Key role of terminal hydroxyl groups and visible light in the reactive adsorption/catalytic conversion of mustard gas surrogate on zinc (hydr)oxides

“…The E g of ZnSA, ZnRA and ZnO C is 3.22 eV, 3.05 eV and 2.98 eV, respectively. While the E g of ZnRA and ZnO C are in the range of other ZnO materials reported in the literature [25], the ZnSA band gap energy represents a typical value found for zinc (hydr)oxides [26,27]. A wide band gap feature is an advantage of our materials, since this characteristic is beneficial for the development of optical and electronic devices [28].…”

The effects of fabrication temperature on current-voltage characteristics and energy efficiencies of quantum dot sensitized ZnOH-GO hybrid solar cells

“…The morphologies of zinc (hydr)oxide and its composites were previously reported using the images obtained by Two Photon Fluorescence (TPF) Microscopy, Scanning Electron Microscopy (SEM), and Scanning Tunneling Microscopy (STEM). [8][9][10][11] Third, graphite-oxide (GO) was synthesized by oxidation of graphite (Sigma-Aldrich) using Hummers method, detailed elsewhere. 8,12 Fourth, prior to chemical synthesis of ZnOH-GO composites, the structures of the precursor materials were investigated.…”

“…Using this imaging technique, particle size and their distribution were reported earlier. [9][10][11] TPF imaging was performed with the Ultima Multi-Photon-Microscope (Olympus BX-51 of Prairie Tech. Inc., WI, USA).…”

“…Presence of pores in the ZnOH-GO structure at room temperature was previously reported. 9,10 Changes in the texture and chemistry of the samples, due to an increase in fabrication temperature, observed are responsible for better performance of the solar cells. The initial samples of ZnOH-GO exhibit some porosity, especially in the mesoscopic range ($11.94 6 3.21 lm).…”

The role of ammonia hydroxide in the formation of ZnO hexagonal nanodisks using sol–gel technique and their photocatalytic study

“…Islam et al was 2.88 eV. [20] Thus, this emission could be attributed to the presence of ZnAlCO 3 phase or crystal defects such as oxygen vacancies [21À23] in the ZnO hexagonal nanodisks.…”