Impact of Radio Frequency Plasma Power on the Structure, Crystallinity, Dislocation Density, and the Energy Band Gap of ZnO Nanostructure

Abstract

The aim of this study is to investigate the effect of radio frequency (RF) plasma power on the morphology, crystal structure, elemental chemical composition, and optical properties of ZnO nanostructure using a direct current magnetron sputtering technique. This study emphasized that the growth rate and surface morphology of the polycrystalline ZnO were enhanced as the radio frequency (RF) plasma power increased. This can be observed by fixing other parameters such as the growth time, substrate temperature, and chamber partial pressure. The RF plasma power alteration from 150 to 300 W can produce uniform nanograin, spheroid, and nanorods. Additionally, the RF plasma power alteration leads to the alteration in the ZnO nanorod diameter from 14 to 202 nm. It was observed that the XRD intensities are increased at higher plasma powers. This, perhaps, can be inferred from the transformation of the granular microcrystals to the needlelike or platelike large crystals, as already examined using SEM images. This also has an impact on the average crystalline size, which increased from 10 to 40 nm on increasing the RF plasma power. Moreover, the increase of the RF plasma power has an obvious impact upon the optical band-gap energy, which was accordingly decreased from 3.26 to 3.22 eV. Finally, the absorption band edge was shifted to a lower-energy region due to the quantum size effect at the nanorange.

Facile Fabrication of UV Photodetectors Using Spin-Coating Flame-Synthesized ZnO Nanoparticles

“…11,13 Due to its nontoxic nature, high chemical and mechanical stability, excellent electrical properties, and relatively economical fabrication cost, ZnO emerges as a promising candidate for the development of cost-effective photodetectors across a diverse range of applications, including wearable and personal-ized UV monitoring devices. 9 Several nanofabrication methods, such as radio frequency magnetron sputtering (RFMS), 14 flame spray pyrolysis (FSP), 11,15,16 chemical vapor deposition (CVD), 17,18 pulsed laser deposition (PLD), 19 hydrothermal (HT), 20,21 and conventional spin coating based on sol−gel system 12,22,23 have been used, demonstrating significant improvement over bulk equivalents. 11 In our previous work, 11,13,24,25 we reported the flame-made ultraporous nanoparticle networks (UNN) as highly performing nanostructures for visible-blind UV photodetectors, demonstrating high photocurrents (hundreds of μA) and low nanoampere dark current under low UVR density of 100 μW• cm −2 and an applied bias of a few volts (1−5 V).…”

“…The direct bandgap structure of ZnO enables a sharp photoresponse contrast between the visible and UV spectra, , facilitating efficient detection of UV light and a high selectivity against the visible spectrum ( R UV / R vis ). , Due to its nontoxic nature, high chemical and mechanical stability, excellent electrical properties, and relatively economical fabrication cost, ZnO emerges as a promising candidate for the development of cost-effective photodetectors across a diverse range of applications, including wearable and personalized UV monitoring devices . Several nanofabrication methods, such as radio frequency magnetron sputtering (RFMS), flame spray pyrolysis (FSP), ,, chemical vapor deposition (CVD), , pulsed laser deposition (PLD), hydrothermal (HT), , and conventional spin coating based on sol–gel system ,, have been used, demonstrating significant improvement over bulk equivalents …”

Investigation of ferromagnetism and dual donor defects in Y-doped ZnO thin films

“…Dislocation density d ( ) is an indicator of defects in the lattice and it may favour the aggregation of native defects in the ZnO lattice [37]. Abdul Rahman et al observed that non-stochiometry in ZnO lattice increases dislocation density [38]. It is also observed that the formation energy for the point defects is reduced due to dislocations in the lattice [39].…”

Green Synthesis of ZnO/CuO Nanocomposites Using Parsley Extract for Potential In Vitro Anticoccidial Application

“…19 Similarly, ZnO NPs have evolved into a very valuable material over time due to their eco-friendly attributes, great stability, low cost, and simple manufacturing methods. 20 Meanwhile, ZnO/CuO NCs serve as a prominent example owing to their antimicrobial activities. 21 It was discovered that Cu-doped ZnO nanorods have higher photocatalytic and antibacterial properties than pure nanostructures.…”

“…CuO NPs have strong electron correlation effects, high heat conductivity, and spin dynamics . Similarly, ZnO NPs have evolved into a very valuable material over time due to their eco-friendly attributes, great stability, low cost, and simple manufacturing methods . Meanwhile, ZnO/CuO NCs serve as a prominent example owing to their antimicrobial activities .…”