Enhancement of Optical Parameters for PVA/PEG/Cr2O3 Nanocomposites for Photonics Fields

Enhancement of Optical Parameters for PVA/PEG/Cr2O3 Nanocomposites for Photonics Fields

Musaab Khudhur Mohammed Mohammed Hashim Abbas* Ahmed Hashim Bahaa H. Rabee Majeed Ali Habeeb Noor Hamid

Department of Physics, College of Education for Pure Sciences, University of Babylon, Babylon 51002, Iraq

Medical Physics Department, Al-Mustaqbal University College, Babylon 51001, Iraq

Corresponding Author Email: 
29 April 2022
11 June 2022
31 August 2022
| Citation



In this study, many samples have been synthesized by using solution casting technique with different additive content of Chromium oxide nanoparticle (Cr2O3NPs), poly vinylalcohol (PVA) and polyethylene glycol (PEG). The UV-Vis. spectrophotometer used to record the absorbance spectrum in the range of (200-800) nm. The absorption of UV waves is improved while the transmittance is reduced when Cr2O3 NPs were added to the polymeric system which are useful for a number of applications including low-cost UV protection and solar radiation shield. When Cr2O3 NPs concentrations increased, the optical energy gap for indirect transition (allowed and forbidden) was decreased. Furthermore, all the optical constant has been improved.


Cr2O3, nanocomposites, optical properties, blend, nanoparticles

1. Introduction

Polymer nanocomposites have recently gained popularity due to the unique properties that these materials can achieve. Metal [1-3] and semiconductor [4-6] nanoparticles exhibit extraordinary optical and electrical properties, and polymers are regarded to be a good host material for these nanoparticles. Similarly, Because of their high surface-to-bulk ratio, nanoparticles have a considerable impact on the matrix, producing in some exceptional properties that aren't available formed at one of the pure materials. More research into theto better predict the composite's final properties therefore, the impact of nanoparticles on the properties of a polymer matrix is required [7-9]. Lately, composites of polymer/ceramic filler obtain raised consideration related their attractive electronic and electrical characters, angular acceleration accelerometers, integrated decoupling capacitors, electronic packaging and acoustic emission sensors are several potential fields [10]. PVA is a semi crystalline polymer, offers a wide range of uses owing to the role of the OH collection and hydrogen bonding [11]. Because of its compatibility with the living body, it can also be used as a medical substance [12]. In addition, PVA can selectively absorb metallic ions like as copper, palladium, and mercury. PVA is made up of the chemical formulation (C2H4O)x, which has a density of (1.19-1.31)g/cm3 and a melting temperature of 230℃. Over 200℃, it degrades rapidly [13]. is a form of thermoplastic polymer with a flexibility of C–O–C bonding. It also possesses solubility in organic solvents, hydrophilicity, crystallinity y, and self-lubricating properties. As a result, PEG is one of the most widely used polymers for the creation and growth of a wide range of vital applications [14]. There are several studies on PEG and PVA nanocomposites for various applications like energy storage [15-17], antibacterial [18] and humidity sensors [19-21]. This paper aims to prepare the PVA-PEG-Cr2O3 nanocomposites and investigating its optical properties.

2. Experimental Work

Nanocomposites films of polyvinyl alcohol (PVA)/ polyethylene glycol (PEG) with different contents of chromium oxide (Cr2O3) nanoparticles were prepared by casting process. The PVA/PEG blend was prepared with ratio(70%PVA/30%PEG) by dissolving of 1 gm in distilled water (30 ml). The Cr2O3 NPs were added to the (PVA/PEG) blend with ratios 1%, 2%, and 3%. The optical characteristics of PVA/PEG/Cr2O3 nanocomposites were tested using spectrophotometer (UV-18000A-Shimadzu).

3. Result and Discussion

Figure 1 displays the influence of Cr2O3 NPs on the absorbance of PVA-PEG blend with wavelength range (200-800) nm. Because free electrons absorb incident light, the absorbance of nanocomposite increases as the concentration increases [22]. This result is agreement with previous studied [23, 24]. The high absorbance of nanocomposites at UV region due to the photon energy enough to interact with atoms lead to the high absorbance [25].

The optical transmittance of PVA-PEG-Cr2O3 nanocomposites is shown in Figure 2. The transmittance decreases when the Cr2O3 concentration in the PVA-PEG nanocomposite increasing from 1% to 3%, as shown in this figure.

The absorption coefficient (α)calculated by the equation [26]:

$\alpha=2.303 \frac{A}{t}$             (1)

where, (A) is the absorption and (t) is the specimen thickness.

The absorption coefficient versus photon energy are shown in Figure 3. When the increasing of the Cr2O3NPs concentration, the α increase. The increase of α is due to an increase in light absorption [27]. The nanocomposites are said to have an indirect energy gap if the value of α is less than 104 cm-1. The polymer blend had low α this may be as a result of low crystallinity [28, 29].

Figure 1. Influence of Cr2O3 NPs on the absorbance of PVA-PEG blend

Figure 2. Optical transmittance of PVA-PEG-Cr2O3 nanocomposites

Figure 3. Absorption coefficient of PVA-PEG-Cr2O3 nanocomposites versus photon energy

The energy gap is calculated using the Tauc relation [24]:

$\alpha h v=B\left(h v-E_g\right)^r$              (2)

where, Eg denotes the optical energy gap, r=2 or 3 denotes the allowed or forbidden indirect transition, hν denotes electromagnetic energy, and B is a constant.

By graphing (αhυ)1/2 and (αhυ)1/3 versus hν in Figures 4, 5, the band gap was calculated. The allowed energy gap decreased from 4eVfor the pure PVA-PEG to 3.4 eV for the PVA-PEG- 3% Cr2O3 nanocomposite and 3.2eV for the pure PVA-PEG to 2 eV for the PVA-PEG-3% Cr2O3 nanocomposite for the forbidden energy gap. The energy gap reduces with rise in the Cr2O3 NPs content which is due to the create of localized levels in the band gap [30, 31]. The value of energy gap are shown in Table 1.

Figure 4. (αhυ)1/2 versus hν of PVA-PEG-Cr2O3 nanocomposites

Figure 5. (αhυ)1/3 versus hν of PVA-PEG-Cr2O3 nanocomposites

Table 1. Energy gap values of PVA-PEG-Cr2O3 nanocomposites

Cr2O3 NPs wt.%
















Using the following relation to determine the extinction coefficient (K) [32]:

$K=\alpha \lambda / 4 \pi$                (3)

The extinction coefficient for (PVA-PEG-Cr2O3) nanocomposites is revealed in Figure 6 as a function of wavelength. It is worth noting that K increases as the concentration of Cr2O3NPs increases. This reason attribute to the enhancement of the absorption coefficient when the additive of Cr2O3NPs. This result agreement with the previous studied [33].

Figure 6. Extinction coefficient for (PVA-PEG-Cr2O3) nanocomposites

The refractive index (n) of (PVA-PEG-Cr2O3) nanocomposites was calculated by [34]:

$n=\left(1+R^{1 / 2}\right) /\left(1-R^{1 / 2}\right)$          (4)

The refraction index of (PVA-PEG-Cr2O3) nanocomposites versus of wavelength as shown in Figure 7. As revealed in the numeral, the refractive index tends to increase as the increase of Cr2O3NPsconcentration in the PVA-PEG film. The reason for this is that as the increase of Cr2O3 concentration, the density of the nanocomposites increases as well [35, 36].

Figure 7. Refraction index of (PVA-PEG-Cr2O3) nanocomposites versus wavelength

The following equations were used to calculate the real and imaginary (ε1 and ε2) portions of dielectric constant [37]:

$\varepsilon_1=n^2-k^2$             (5)

$\varepsilon_2=2 n k$          (6)

The variation of (ε1) versus of wavelength is indicated in Figure 8. Because of the low value of K2, the real dielectric constant increases as the concentration of Cr2O3 nanoparticles increases. The change in ε2versus of wavelength is shown in Figure 9. Due to the relationship between α and K, it should be said that ε is dependent on K values that vary with the absorption coefficient. This result is agreement with the previous studied [38].

Figure 8. Variation of (ε1) versus wavelength

Figure 9. Variation of (ε2) versus wavelength

Optical conductivity (σ) was determined using the equation [39]:

$\sigma=\alpha n c / 4 \pi$             (7)

In which c denotes the light speed, n the refractive index, and is the absorption coefficient. Figure 10 shows the optical conductivity of PVA-PEG-Cr2O3 nanocomposites versus of wavelength. (σ) of the PVA-PEG-Cr2O3 nanocomposite increases as the Cr2O3content increases.

Figure 10. Optical conductivity of PVA-PEG-Cr2O3 nanocomposites versus wavelength

4. Conclusion

This paper includes the preparation of (PVA-PEG-Cr2O3) nanocomposites and studying its optical properties. The obtained results indicated that improvement in the optical properties of the (PVA-PEG-Cr2O3) nanocomposite when adding different percentages of Cr2O3NPs. Therefore, the nanocomposite (PVA-PEG-Cr2O3) can be used in different application such as photodetector and low-cost UV protection.


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