Optical Properties of ZnO Nanoparticles Synthesised from a Polysaccharide and ZnCl₂

Abstract

In this article we study the optical properties of ZnO nanoparticles. This paper describes cost effective, high yield, and a facile synthetic method for the synthesis of ZnO nanoparticles from precursors viz. linear polysaccharide, chitosan, and ZnCl2 by a precipitation method. The synthesized ZnO nanoparticles were characterized by surface area, pore size, and UV-visible measurements. The optical band gap and the Urbach energy were also calculated and the optical band gap energy of the synthesized ZnO nanoparticles was found to be 3.26 eV and the nature of the optical transition has been identified as direct allowed.

Synthesis, Characterisation and Catalytic Studies of Nano Zinc Oxide-Alumina for Displacement Reaction on Carbonyldiimidazole

“…Fig.-2: XRD Spectrum of ZnO-Al 2 O 3 UV-DRS spectrum of ZnO-Al 2 O 3 NP in Fig.-3 reveals the absorbance peak in the range of 350 -380 nm corresponding to the characteristic band of ZnO NP42 . This is also in accordance with the reports available in the literature on the UV spectral characteristics of ZnO NP [43][44][45]. …”

“…This is also in accordance with the reports available in the literature on the UV spectral characteristics of ZnO NP. [43][44][45] Fig. Whereas aluminium doped ZnO NP has been reported to exhibit a blue shift in the UV absorption attributed to the direct transition of electrons in the ZnO nanocrystals.…”

Estimation of Structural and Optical Parameters of (Mg, B) co-doped ZnO Nanoparticles

“…The minimum Urbach energy value was obtained at 1% B concentration. The behavior of Urbach energy is inversely proportional to the crystallite sizes (D) with the Debye-Scherrer and other Williamson-Hall methods as illustrated in Figure 17(b), demonstrating a decrement of the essential disorder [47]. The Urbach energy rises with boron substitution after 1% boron concentration, as shown in Figure 17(a), because of the corresponding variations in the structural disorder as stated by numerous researches for zinc oxide-based films [48][49][50].…”

“…The application of these finite difference methods can also be found in [45][46]. Figure 17(a) and Table 8 [47]. The structural disorder in the Zn0.98-xMg0.02BxO structures fluctuated with increasing concentrations of B in the Zn0.98-xMg0.02BxO structures which might be a sign of the increase in .…”

Effect of zinc oxide quantum dots on the photovoltaic properties of natural dye‐sensitized solar cells

“…The bandgaps of samples Qd-A, Qd-B, Qd-C, and Qd-D were calculated to be 3.45, 3.5, 3.4, and 3.35, respectively, using the Tauc equation ( Figure 10). 65,66 The largest bandgap was obtained for the Qd-B sample due to its particle size and quantum power. The smallest bandgap belonged to the Qd-D sample indicating the coarsening of the particles, resulting in a reduction in quantum power due to the higher concentration of PVP40.…”