Functional Properties of Donor (Al) and Acceptor (Cu) Codoped High Dielectric Constant ZnO Nanoparticles

Abstract

In this work, we have synthesized donor-acceptor (Al-Cu) codoped ZnO nanoparticles with a doping concentration of 0%, 0.25%, 0.5%, and 0.75% by coprecipitation method. The synthesized samples were then annealed at 350°C and 600°C. All the samples showed wurtzite structure of ZnO with no secondary phase. The increase in doping concentration led to deterioration of crystalline quality, while improved crystallinity was observed at higher annealing temperature. The morphological study of these samples showed good grain-to-grain contact with less isolated pores. These samples were further characterized by impedance spectroscopy for analyzing dielectric properties. The values of the real part of dielectric constant and tangent loss showed decreasing trend with frequency. The appearance of semicircular arcs in the impedance complex plane plots indicates contribution of grains and grain boundaries and presence of different relaxation processes. 0.5% Al and Cu codoped ZnO showed the best dielectric response with a high value of dielectric constant and low tangent loss.

Aloe vera assisted green synthesis of Ag and Cu co-doped ZnO nanoparticles and a comprehensive analysis of their structural, morphological, optical, electrical and antibacterial properties

“…Studies have shown that co-doping ZnO nanoparticles with Mn & Co [ 62 ], Fe & Co [ 63 ], and Ni & Co [ 64 ] exhibit better antimicrobial, photocatalytic, and ferromagnetic properties compared to pure and mono-doped ZnO NPs. Co-doping with Ni & Cu [ 65 ], Y & Cu [ 66 ], and Al & Cu [ 67 ] show higher dielectric constant, ferromagnetism, and better optical properties suitable for optoelectronic device development. On the other hand, co-doping ZnO nanoparticles with Al & Ag [ 68 ], Ni & Ag [ 69 ], and Y & Ag [ 69 ] have been observed to have better electrical, optical, and photocatalytic properties.…”