Band Gap Tuning and Room-Temperature Photoluminescence of a Physically Self-Assembled Cu₂O Nanocolumn Array

Abstract

The morphology modification of nanostructured materials is of great interest due to controllable and unusual inherent properties in such materials. In this work, growth and morphology evolution of a well-separated Cu2O nanocolumn array is explored by tuning deposition angle and substrate rotation speed in oblique angle deposition (OAD). X-ray diffraction and photoluminescence measurements reveal that crystal quality and optical properties crucially depend on the morphology of the nanostructures. An intense room-temperature photoluminescence (RTPL) signal at 525 nm indicates that the Cu2O nanocolumn arrays exhibit strong green luminescence. The morphology-dependent band gap tuning makes this approach of great potential for nanoscale optoelectronic applications.

Template free mild hydrothermal synthesis of core–shell Cu2O(Cu)@CuO visible light photocatalysts for N-acetyl-para-aminophenol degradation

“…The enhanced photocatalytic performance was further evidenced by the charge separation and recombination properties. Photo luminance spectra (excitation @380, and 572nm) and the emission were recorded 420, 572 nm and 616 nm of synthesised photocatalyst (Fig.7a-b), confirmed the recombination properties, the slower radiative recombination presence of Cu species may accelerate the valency and conduction band positions, and trap electrons from the photoexcited electron-hole pairs for higher photocatalytic activity [42][43][44] . holes (h vb + ).…”

Efficient Degradation of Endocrine Disruptors Using 1D and 3D Copper (I) Oxide Nanostructures

“…Mostly different nano‐ composite materials like rGO‐ Ag nanoparticle, Ag–AgCl/ZnFe 2 O 4 magnetic nanocomposite, Ag@helical chiral TiO 2 nanofibers has been used for the degradation of different endrocrine disruptors. However our aim was to use a single component as photocatalyst as recent research shows fascinating results with respect to synthesis, band gap tuning, field electron emission,, thermal energy conversion, energy storage,, catalyst,, hydrophobic surfaces,, gas adsorbant etc. Some specific examples of photocatalytic removal of E1 and EE2 are given in Table .…”

“…In this regard, Cu 2 O, an intrinsically p ‐ type semiconductor appears as a very fascinating simple oxide material to researchers due to its low band gap of 2.2 eV which makes it a visible light active photocatalyst, easy availability, non‐ toxicity, low cost as well as the ease in tuning the morphology and different crystal orientation. However, photocatalytic degradation ability of Cu 2 O towards endocrine disrupting compounds has remained unexplored till date.…”

Effect of angle deposition γ on the structural, optical and electrical properties of copper oxide zigzag (+γ, −γ) nanostructures elaborated by glancing angle deposition

“…We believe that the combined effect of deposition angle and the coexistence of copper oxide phases leads to the (4) blue shift of the absorption edge. I. Mukherjee et al [41] found a similar result for physically selfassembled Cu 2 O nano-column array grown by oblique angle sputter deposition. They explained that the blue shift in nano-columnar structures with high anisotropic crystal orientation could be discussed in terms of the light of Burstein-Moss effect since the loss of charge carriers due to trapping at grain boundaries is expected to be minimized in such structures.…”