Synthesis, Structure and Optical Properties of CdO Nanocrystals Directly Grown on Cd Foil

Abstract

Semiconductor nanocrystals directly grown on the conducting metal can lower the contact resistance and can benefit the electron transfer between the semiconductor and the metal. In the present work, CdO nanocrystals are directly synthesized on the conducting Cd foil through a simple solvothermal method. Cd foil is used as the Cd 2+ source and the substrate. The average size of CdO nanocrystals is ∼23.1 nm by analyzing the XRD data. Moreover the growth mechanism is discussed. A hierarchic structure characterized by the nano rods and nano particles in the top and bottom layers, respectively, can be observed. From the UV-vis absorption analyzed by Tauc's relation, the two different optical band gaps are obtained. The photoluminescence spectrum is obtained and studied.

Recovery of Valuable and Hazardous Metals (Ni, Co, and Cd) from Spent Ni–Cd Batteries Using Polyvinyl Chloride (PVC) in Subcritical Water

“…This result indicated that under the above optimized recycling conditions, the Ni, Co, and Cd metals were efficiently leached into the solution from the waste Ni–Cd powder. Moreover, some new peaks were also found to have appeared in the XRD spectra of the solid residue, which could be attributed to the phase transformations of Ni­(OH) 2 and Cd­(OH) 2 to NiO and CdO or CdCO 2 . , The results of XRD patterns showed that PVC favorably impacted the dissolution of Ni, Co, and Cd from the spent Ni–Cd battery powder in subcritical water and increased the leaching efficiency. To further confirm the effective leaching efficiencies, FE-SEM and EDX analyses were studied.…”

A low-dimensional crystal growth model on an isotropic and quasi-free sustained substrate*

“…Low-dimensional nanocrystals, including nanowires, nanorods, nanobelts, nanoplates, and nanosheets, etc., have triggered numerous fundamental and technological studies for their unique properties in recent decades. [1][2][3] Using them as active components, various types of nanoscale devices have been fabricated, such as photovoltaic, [4] thermoelectric, [5] and electromechanical [6] devices. The controllable growth of the low-dimensional nanocrystals in terms of the morphologies, sizes and microstructures is urgently desired for their practical applications.…”