Modulation of Optical Band Gap of 2-Amino Terephthalic Acid Cu-MOFs Doped with Ag&lt;sub&gt;2&lt;/sub&gt;O and rGO

Challa, Malathi; Ambika, M.R.; Usharani, S.R.; Batakurki, Sheetal; Yallur, Basappa C.

doi:10.4028/p-i3rcg6

AMR

2022

DOI: 10.4028/p-i3rcg6

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Modulation of Optical Band Gap of 2-Amino Terephthalic Acid Cu-MOFs Doped with Ag<sub>2</sub>O and rGO

Malathi Challa¹,

M.R. Ambika²,

S.R. Usharani³

et al.

Abstract: The synthesized MOF with copper metal dopant has shown band gap around 1.5 eV which falls in the UV region of electromagnetic spectrum. This MOF with copper turns into nano/MOF composite with addition of Ag2O and rGO to it. The results of band gap of MOF/ Ag2O and MOF/rGO showed 1.904 eV and 1.639 eV respectively. This shift in band gap supports to use them as a UV and near visible light harvest catalyst and also assist in enhancing mechanical, thermal and structural behaviour of compounds. The enhancement of … Show more

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Cited by 3 publications

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Synthesis, Characterization, Optical and Luminescence Properties of Copper Based Metal Organic Frame Works

Pai¹,

Adimule²,

Yallur

et al. 2023

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Herein, we report synthesis of two new copper metal organic frameworks. The organic linkers were terephthalic acid with 6-Dihydroimidazo[2,1-b]thiazole-2-carbaldehyde and terephthalic acid with 3-benzothiazol-2-yl-malonaldehyde used in the copper nano metal organic framework (MOF). Both the Cu-MOF’s were characterized by XRD, UV-vis spectroscopy and FTIR. XRD crystallographic studies revealed the presence of copper metal at 2θ at 18.4°. Tauc plots were simulated to calculate the band gap of both Cu-MOF’s and result indicated the band gap energy of Cu-MOF 1 at 3.31 eV and for Cu-MOF 2 was at 3.57 eV. The UV-Visible absorption studies indicated two bands for Cu-MOF 1 and Cu-MOF 2 at 326 nm. However, the second band in Cu MOF 1 at 509 nm was slightly shifted to higher wavelength at 516 nm in Cu-MOF 2 due to the extension of π-π* transition. The photoluminescent properties of both Cu-MOF’s indicated a strong band at 505 nm. Thus, the optical properties of both the Cu-MOF’s infers that these can be a promising semiconductor material for various electronic applications.

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Synthesis, Characterization, Optical and Luminescence Properties of Copper Based Metal Organic Frame Works

Pai¹,

Adimule²,

Yallur

et al. 2023

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Study of Temperature Effect on the Structure and Optical Properties of RIT- 62 Cu-MOFs

Kamat

Adimule²,

Yallur³

et al. 2023

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Metal organic frameworks are the materials of today’s generation and are widely used for their various physicochemical properties. MOFs are synthesized by various methods such chemical precipitation method, solgel method, hydrothermal method etc. To attain the required optoelectronic properties of MOFs, synthetic methods play a important role. In the present work, the synthesis of Cu-MOFs was carried out at 80 °C and 120 °C. The synthesized Cu-MOFs were labeled as RIT 62-Cu-MOF-1 and RIT 62-Cu-MOF-2. Both the Cu-MOFs were characterized by FTIR, UV-visible spectra. The FESEM of both Cu-MOFs indicated that spherical particles with 120 to 200 nms. of particle size. Tauc’s method was employed to compute the band gap of both Cu-MOFs. RIT 62-Cu-MOF-1 imparted 2.67 eV while RIT 62-Cu-MOF-2 imparted average of 2.06 eV off bandgap. 2.35 eV due to ligand-metal charge transfer observed through UV-visible spectra. Further, optimization of synthetic procedures to enhance the optical properties of Cu-MOFs.

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Synthesis and Optical Properties of Copper Terephthalate Metal Organic Frame Works

Nagalakshmi,

Nandeesh,

Yallur

et al. 2023

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Two new copper-based metal organic frame work (Cu-MOF21 and CU-MOF-22) was synthesized using bromo malonaldehyde and terephthalic an amino terephthalic acid. They synthesized CU-MOFs were characterized by FT-IR, UV-Visible spectroscopy. The XRD diffraction pattern indicated 2 θ at 17.3° and 26.8°. The Tauc’s method was employed to calculate the band gap of Cu-MOFs and was found that Cu-MOFS-21 exhibited 3.14 eV and Cu-MOF-22 with average bandgap energy at 3.61 eV attributed to the ligand-metal charge transfer. The results indicate that both Cu-MOFs can be further modified by suitable dopants to enhance the conductivity and reduce the band gap energy. Keywords: Metal organic frameworks, Copper metal, Bandgap energy, photoluminescence,

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Modulation of Optical Band Gap of 2-Amino Terephthalic Acid Cu-MOFs Doped with Ag<sub>2</sub>O and rGO

Cited by 3 publications

References 64 publications

Synthesis, Characterization, Optical and Luminescence Properties of Copper Based Metal Organic Frame Works

Synthesis, Characterization, Optical and Luminescence Properties of Copper Based Metal Organic Frame Works

Study of Temperature Effect on the Structure and Optical Properties of RIT- 62 Cu-MOFs

Synthesis and Optical Properties of Copper Terephthalate Metal Organic Frame Works

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