Bandgap Energy of TiO₂/M-Chlorophyll Material (M=Cu²⁺, Fe³⁺)

Yusprianto, Muhammad; Zaharah, Titin Anita; Silalahi, Imelda Hotmarisi

doi:10.14710/jksa.24.4.126-135

Cited by 8 publications

(7 citation statements)

References 25 publications

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“…The most significant reduction in Egap was seen in TiO2/Cu 2+ -Molar Absorptivity, curcumin, then TiO2/Na + -curcumin. Similar observations have been reported for chlorophyll complexes, where the insertion of Cu 2+ -chlorophyll and Fe 3+ -chlorophyll compounds onto the surface of TiO2 causes a decrease in the TiO2 bandgap energy [14,21]. Based on the observational data in this study, it can be seen that the trend of decreasing the bandgap energy of TiO2 seems the same as the light absorption value of the sensitizer molecules in solution in which the material indicates the highest decrease in the Egap value with the highest ability to absorb light, namely Cu 2+ -curcumin.…”

Section: Bandgap Energy Of Tio2/m-curcumin (M= Na + Mg 2+ Cu 2+ )supporting

confidence: 86%

Bandgap Energy of TiO2/M-Curcumin Material (M = Na+, Mg2+, Cu2+)

et al. 2022

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Bandgap energy (Egap) of TiO2/curcumin as well as TiO2/M-curcumin (M = Na+, Mg2+, Cu2+) was determined. The material was prepared on transparent conductive oxide as TiO2 film. Then, the curcumin and curcumin derivatives were adsorbed on TiO2 surface by immersing the film in solution of the compounds. The diffuse reflectance UV-Vis spectra of the materials were recorded and utilized to calculate the Egap using the Tauc plot method. The calculation gave the Egap of TiO2 of 3.27 eV that lowers after being deposited with curcumin and metal-curcumin compounds. The Egap of TiO2/curcumin was 2.82 eV, while TiO2/Na+-curcumin, TiO2/Mg2+-curcumin, and TiO2/Cu2+-curcumin were 2.36, 3.11, and 2.15 eV, respectively. Curcumin metal complexes, i.e., TiO2/Cu2+-curcumin, showed high molar absorptivity and effectively deposited on the TiO2 lowers the bandgap energy of TiO2 compared to free-curcumin on TiO2.

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Section: Bandgap Energy Of Tio2/m-curcumin (M= Na + Mg 2+ Cu 2+ )supporting

confidence: 86%

Bandgap Energy of TiO2/M-Curcumin Material (M = Na+, Mg2+, Cu2+)

et al. 2022

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“…Salah satu syarat zat warna alami dapat digunakan sebagai bahan dasar DSSC adalah harus memiliki nilai celah energi yang lebih kecil dari nilai celah energi semikonduktornya [7]. Nilai celah energi semikonduktor TiO2 berkisar antara 3,2-3,9 eV [8]. Dalam DSSC, energi foton diserap dari sinar matahari yang terdiri dari sekitar 4% cahaya ultraviolet dan 96% cahaya tampak [9], elektron dalam zat warna akan tereksitasi dari keadaan highest occupied molecular orbital (HOMO) ke keadaan lowest unoccupied molecular orbital (LUMO) kemudian elektron akan berpindah ke pita konduksi semikonduktor TiO2 dan kemudian berdifusi ke kaca konduktif/substrat ITO (Indium Tin Oxide) [10].…”

Section: Pendahuluanunclassified

“…Dari Gambar 3 dan 4 didapatkan nilai celah energi optik senyawa antosianin untuk hasil ekstraksi dan ekstraksi-evaporasi selada laut, yaitu masing-masing adalah 2,69 dan 2,54 eV. Tampak bahwa nilai celah energinya lebih kecil dari pada nilai celah energi semikonduktor TiO2, yaitu antara 3,2-3,9 eV [8]. Hal ini menunjukkan bahwa antosianin dari tumbuhan selada laut hasil ekstraksi dan ekstraksi-evaporasi dapat digunakan sebagai bahan zat warna DSSC.…”

Section: Hasil Dan Pembahasanunclassified

Determination of the Optical Band gap Energy from the Extraction and Evaporation of Anthocyanin Compound Sea Lettuce (Ulva Lactuca L.) Using Tauc Plot Method

Santika

Suyanto²,

Trisnawati³

et al. 2024

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The optical energy gap of anthocyanin compounds from sea lettuce extract (Ulva lactuca L.) has been calculated using the Tauc plot method. Sea lettuce plants taken at Sanur Beach Bali. The sea lettuce was dried then mashed and extracted for 24 hours, the last being macerated through three cycles. The extraction results are then evaporated to obtain a thick extract solution. Extracted and evaporated-extraction samples were characterized by UV-Vis in the wavelength range of 200-800 nm. From the characterization results, it was found that the absorption of anthocyanin compounds for the extracted samples was at a wavelength of 268 and 412 nm. Meanwhile, for the extraction-evaporation sample, the absorption is at a wavelength of 286.5 and 408 nm. By using the Tauc plot method, the optical energy gap values ??for the extracted and extraction-evaporated samples were 2.69 and 2.54 eV, respectively. Therefore, anthocyanin compounds from both extracted and evaporation-extracted samples qualify as dye sensitized solar cells (DSSC) for TiO2 semiconductors.

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“…Telah dilaporkan juga reaksi antara klorofil dengan ion logam besi(III) dan tembaga(II) yang menghasilkan produk yang dideposisikan pada permukaan TiO2. Sensitasi film TiO2 dengan senyawa besi(III)-klorofil atau tembaga (II)-klorofil dapat menurunkan energi celah pita dari 3,02 eV menjadi 2,80 -2,90 eV sehingga memperlebar absorpsi cahaya ke arah energi yang lebih kecil [3] .…”

Section: Pendahuluanunclassified

“…Energi vibrasi yang berkaitan dengan gugus fungsi O-H dan gugus hidrokarbon C-H alkana tidak mengalami pergeseran yang signikfikan. Pergeseran yang kecil diamati pada gugus fungsi C=O ester yang meningkat dari 1721 cm -1 menjadi 1724 cm -1 yang diduga akibat masuknya ion logam seng(II) dalam klorofil [3] . Puncak yang terkait dengan gugus C=C aromatik mengalami penurunan dari 1451 cm -1 menjadi 1447 cm -1 mengindikasikan terjadinya penurunan energi ikatan pada ikatan C=C yang mungkin disebabkan oleh koordinasi antara atom N dengan ion Zn 2+ .…”

Section: Sintesis Dan Karakterisasi Senyawa Kompleks Zn(ii)-klorofilunclassified

ENERGI CELAH-PITA MATERIAL TiO2/KOMPLEKS LOGAM-KLOROFIL (M=Zn2+, Co2+) DARI DAUN SINGKONG (Manihot esculenta crant) (BANDGAP ENERGY OF MATERIAL OF TiO2/METAL-CHLOROPHYLL COMPLEX (M= Zn2+, Co2+) FROM CASSAVA LEAVES (Manihot esculenta crant))

Sulaiman

Silalahi²,

Shofiyani³

et al. 2022

indonesian

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Synthesis and characterization of TiO2 films sensitized with chlorophyll and metal-chlorophyll complex (M=Zn2+, Co2+) were carried out. Chlorophyll isolated from cassava leaves shows absorption peaks on the UV-Vis spectra in the Soret band area (415 nm) and Q band area (665 nm). The metal-chlorophyll complex was prepared from the reaction of the isolated chlorophyll and ZnCl2 (for Zn2+-chlorophyll); CoCl2.6H2O (for Co2+-chlorophyll) under reflux condition at 65 ºC with a mole ratio of 1:1. The UV-Vis spectra of the isolated products showed a hypsochromic shift to 410 nm and 660 nm for Zn2+-chlorophyll whereas the spectrum of the Co2+-chlorophyll product demonstrated the shifts to 403 nm and 661 nm. These hypsochromic shifts are proposed to be a metal-to-ligand charge transfer (MLCT) transition as a result of chlorophyll metalation. The FTIR spectra of chlorophyll and metal-chlorophyll complexes have a similar pattern despite changes in the absorption of vibrational energy in several functional groups. The absorption of the C=N group shifted from 1372 cm-1 to 1368 cm-1 for both of the complexes, the C=C group of aromatic shifted from 1451 cm-1 to 1447 cm-1 (Zn2+-chlorophyll) and from 1451 cm-1 to 1445 cm-1 (Co2+-chlorophyll), and the C=O group of ketones shifted from 1627 cm-1 to 1645 cm-1 (Zn2+-chlorophyll) and from 1627 cm-1 to 1646 cm-1 (Co2+-chlorophyll). The shift pattern of the absorption peaks on the FTIR spectra indicates the coordination of metal ions towards the N atom in the pyrrole ring in the porphyrin structure of the chlorophyll. When the isolated chlorophyll as well as the chlorphyll complexes was sensitized on the surface of TiO2, variation of bandgap energy was observed. The calculation using the Tauc Plot method resulted in the bandgap energy of films of TiO2 at 3.20 eV, TiO2/chlorophyll at 2.97 eV, TiO2/Zn2+-chlorophyll at 2.87 eV, and TiO2/Co2+-chlorophyll at 2.90 eV

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Bandgap Energy of TiO₂/M-Chlorophyll Material (M=Cu²⁺, Fe³⁺)

Cited by 8 publications

References 25 publications

Bandgap Energy of TiO2/M-Curcumin Material (M = Na+, Mg2+, Cu2+)

Bandgap Energy of TiO2/M-Curcumin Material (M = Na+, Mg2+, Cu2+)

Determination of the Optical Band gap Energy from the Extraction and Evaporation of Anthocyanin Compound Sea Lettuce (Ulva Lactuca L.) Using Tauc Plot Method

ENERGI CELAH-PITA MATERIAL TiO2/KOMPLEKS LOGAM-KLOROFIL (M=Zn2+, Co2+) DARI DAUN SINGKONG (Manihot esculenta crant) (BANDGAP ENERGY OF MATERIAL OF TiO2/METAL-CHLOROPHYLL COMPLEX (M= Zn2+, Co2+) FROM CASSAVA LEAVES (Manihot esculenta crant))

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