Visible-Light Driven Photocatalytic Degradation of 4-Chlorophenol Using Graphitic Carbon Nitride-Based Nanocomposites by Olufemi Oluseun Akintunde, Linlong Yu, Jinguang Hu, Md Golam Kibria, Gopal Achari

“…The band gaps of the photocatalysts were estimated using the UV-Vis DRS characterization results and Tauc plots. The evaluation of the efficacy of the GCN-based catalysts in degrading 4-CP was conducted with different photoreactors such as a royal blue light-emitting diode (LED), a UV-A LED, LUZCHEM cool white lamps, and a solar simulator. …”
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Rare earth ions (La3+, Nd3+) substituted cobalt–strontium spinel ferrites for photocatalytic degradation of textile dyes by Iram Ahmad, Muhammad Safdar, Nazia Yasmin, Aisha Iftikhar, Ambreen Kalsoom, Sadia Khalid, Zil e Shams, Misbah Mirza

“…The optical band gap values of synthesized spinel ferrites were examined with the help of Tauc plots by using UV-visible absorption. It was determined that the energy bandgap ranged from 2.91 to 2.52 eV. …”
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Direct Hydrothermally Synthesized Novel Z-Scheme Dy³⁺ Doped ZnO/SnS Nanocomposite for Rapid Photocatalytic Degradation of Organic Contaminants by Tejaswi Tanaji Salunkhe, Govinda Dharmana, Thirumala Rao Gurugubelli, Babu Bathula, Kisoo Yoo

“…The XPS spectra confirmed the Zn²⁺, Sn²⁺, S²⁻, O²⁻ and Dy³⁺ oxidation states of the constituent elements along with carbon and nitrogen peaks. The Tauc plots showed a decreasing trend in the optical bandgap, i.e., a redshift due to the loading of Dy³⁺ ions into Sn²⁺ ions. …”
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In-Situ Functionalization of Cotton Fabric by TiO₂: The Influence of Application Routes by Mohammad Mamunur Rashid, Matija Zorc, Barbara Simončič, Ivan Jerman, Brigita Tomšič

“…The treated cotton fabric samples were characterized using scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDS), Fourier transform infrared spectroscopy (FT-IR), and X-ray diffraction spectroscopy (XRD) to determine their surface morphology, chemical composition, and crystal structure, while the optical properties of the synthesized TiO₂ were determined using the absorption method and Tauc plotting. Afterwards, corresponding UV protection properties and photocatalytic self-cleaning activity were evaluated. …”
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Visible light-driven dye degradation by magnetic cobalt-doped zinc oxide/iron oxide photocatalyst by Ceng Yik Chong, Jing Yao Sum, Li Sze Lai, Pey Yi Toh, Zhen Hong Chang

“…Characterization tools such as the scanning electron microscope (SEM), energy dispersive X-ray analysis (EDX), attenuated total reflectance – Fourier-transform infrared spectroscopy (ATR-FTIR), and X-ray diffraction analysis (XRD) were utilized to evaluate the effect of cobalt doping on the physicochemical properties of the developed photocatalyst. Tauc plots indicated that 5 mol % Co–ZnO (Co5–ZnO) had the smallest band gap energy (2.79 eV), resulting in the highest photodegradation of methylene blue (88.72 %), compared to pristine ZnO (74.88 %) with a band gap energy of 3.39 eV. …”
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Synthesis, Phase Transition, and Optical Studies of Ba_2−xSr_xZnWO₆ (x = 1.00, 1.25, 1.50, 1.75, 2.00) Tungsten Double Perovskite Oxides by Yousef A. Alsabah, Mohamad S. AlSalhi, Eltayeb M. Mustafa, Abdelrahman A. Elbadawi, Sandhanasamy Devanesan, Mohamed A. Siddig

“…The band gap energy was investigated in two ways—using the absorption cutoff and Tauc plots—which increased from 3.52 to 3.7 eV with increasing substitution of Ba²⁺ by Sr²⁺. …”
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Optical Characterization of Cesium Lead Bromide Perovskites by Fabio De Matteis, Francesco Vitale, Simone Privitera, Erica Ciotta, Roberto Pizzoferrato, Amanda Generosi, Barbara Paci, Lorenzo Di Mario, Jacopo Stefano Pelli Cresi, Faustino Martelli, Paolo Prosposito

“…All the crystals show an absorption edge around 530 nm; Tauc plots of the absorption returned bandgaps ranging from 2.29 to 2.35 eV characteristic of CsPbBr₃ phase. …”
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A comprehensive study on Co-doped CdS nanostructured films fit for optoelectronic applications by Amira Ben Gouider Trabelsi, Kamlesh V. Chandekar, Fatemah.H. Alkallas, I.M. Ashraf, Jabir Hakami, Mohd. Shkir, Ajeet Kaushik, S. AlFaify

“…. % Co: CdS films, respectively using Tauc's plots. The values of extinction coefficient (k) and refractive index (n) were observed in the range of 0.45–0.69 and 2.72–3.05 for as-prepared thin films. …”
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Structural, optical and gamma radiation shielding properties of Bi₂O3/BaO-B₂O₃-TeO₂ doped CeO₂ glass system by Amat, Azuraida

“…The optical band gap energy, Eg,indirect which was calculated from Tauc’ plots decreases from 3.08 to 2.78 eV and 3.49 to 3.23 with the increased amount of Bi2O3 and BaO, respectively. …”
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