Novel bismuth tri-iodide nanostructures obtained by the hydrothermal method and electron beam irradiation

Aguiar, I.; Olivera, Álvaro; Mombrú, Maia; Pereira, Heinkel Bentos; Fornaro, L.

doi:10.1016/j.jcrysgro.2016.06.024

Cited by 6 publications

(6 citation statements)

References 22 publications

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“…Studies have also been carried out on bismuth iodide synthesized using physical vapor deposition (typically involving a modified vertical Bridgman method) for X-ray detection and digital imaging. [4][5][6][7] Similar studies have also been carried out for radiation detection using BiI 3 . [8,9] There has also been a significant interest in the exploration of BiI 3 as a photovoltaic material.…”

Section: Introductionmentioning

confidence: 99%

pH‐Dependent Synthesis of Pure‐Phase BiI₃ and BiOI by Electrodeposition**

Kumar

Varma

Jothi³

et al. 2023

ChemistrySelect

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This study reports the electrochemical synthesis of different morphologies of bismuth iodide and bismuth oxyiodide on graphite surfaces from acidic baths containing bismuth nitrate, sodium nitrate, iodine and ethylene glycol by a simple pH control. Linear sweep voltammetry analyses determined the potential window for the reduction of iodine where bismuth ions do not get reduced. The concentration of the iodide ions in the bath is regulated by the applied potential. At pH 0.2 and 0.5, bismuth is predominantly present as free Bi3+ ions, which react with iodide to form bismuth triiodide. On the other hand, even at slightly elevated pH 1.0 and 2.0, bismuth is predominantly complexed by water, nitrates and ethylene glycol. These complexes react with the iodide ions to form bismuth oxyiodide. Pure triiodide phase comprising polygonal platelets is obtained at pH 0.2. Pure oxyiodide phase comprising novel microflower‐like morphology formed from interlinked nano‐disks is obtained at pH 2.0.

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Section: Introductionmentioning

confidence: 99%

pH‐Dependent Synthesis of Pure‐Phase BiI₃ and BiOI by Electrodeposition**

Kumar

Varma

Jothi³

et al. 2023

ChemistrySelect

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“…Wang et al [3] synthesized BiI3 by a hydrothermal protocol and explored their use for room-temperature X-ray detection. Studies have also been carried out on bismuth iodide synthesized using physical vapor deposition (typically involving a modified vertical Bridgman method) for X-ray detection and digital imaging [4][5][6][7]. Similar studies have also been carried out for radiation detection using BiI3 [8], [9].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Synthesis of Bismuth Iodide and Bismuth Oxyiodide

Govindaraju

Varma

Jothi³

et al. 2022

Preprint

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This study reports the electrochemical synthesis of bismuth iodide and bismuth oxyiodide from acidic baths containing bismuth nitrate, sodium nitrate, iodine and ethylene glycol by a simple pH control. Linear sweep voltammetry analyses determined the potential window for the reduction of iodine where bismuth ion does not get reduced. The concentration of the iodide ions in the bath is regulated by the applied potential and the equilibrium that exists between iodine-iodide and nitrate-nitrite pairs. At pH 0.2 and 0.5, bismuth is predominantly present as free Bi3+ ions, which react with iodide to form bismuth triiodide. On the other hand, even at slightly elevated pH 1.0 and 2.0, bismuth is predominantly complexed by water, nitrates and ethylene glycol. These complexes react with the iodide ions to form bismuth oxyiodide. X-ray diffraction confirms that bismuth oxyiodide is predominantly formed at higher pH (1.0 and 2.0), while at lower pH (0.2 and 0.5), bismuth triiodide is formed. Impedance spectra are consistent with the above mechanism. The deposited bismuth oxyiodide films exhibit a cactus-like morphology formed from interlinked nano-disks, while the bismuth iodide films form micron-size platelet crystallites, both with good surface coverage. X-ray photoelectron spectroscopy confirms the formation of pure BiI3 at pH 0.2, while binding energies of Bi 4f state in pure BiOI prepared at pH 2.0 has a slight shift towards higher binding energies. From diffuse reflectance spectroscopy studies, indirect bandgaps of electrochemically synthesized BiI3 and BiOI were found to be 1.72 eV and 1.98 eV, respectively.

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“…A single layer BiI 3 is a sandwich-like structure with Bi 3+ ions establishing six-fold coordination with I − ions. The BiI 3 layers are held together through weak van der Waals forces, allowing BiI 3 crystals to be cleaved readily along the [00 l] direction 17 – 19 . A schematic structural model of BiI 3 unit cell along with the unit cell parameters is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Single Walled BiI3 Nanotubes Encapsulated within Carbon Nanotubes

Ashokkumar

Enyashin

Deepak

2018

Sci Rep

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Inorganic nanotubes are morphological counterparts of carbon nanotubes (CNTs). Yet, only graphene-like BN layer has been readily organized into single walled nanotubes so far. In this study, we present a simple route to obtain inorganic single walled nanotubes - a novel ultrathin morphology for bismuth iodide (BiI3), embedded within CNTs. The synthesis involves the capillary filling of BiI3 into CNT, which acts as a nanotemplate, by annealing the BiI3-CNT mixture above the melting point of BiI3. Aberration corrected scanning/transmission electron microscopy is used in characterizing the novel morphology of BiI3. A critical diameter which enables the formation of BiI3 nanotubes, against BiI3 nanorods is identified. The relative stability of these phases is investigated with the density functional theory calculations. Remarkably, the calculations reveal that the single walled BiI3 nanotubes are semiconductors with a direct band gap, which remain stable even without the host CNTs.

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Novel bismuth tri-iodide nanostructures obtained by the hydrothermal method and electron beam irradiation

Cited by 6 publications

References 22 publications

pH‐Dependent Synthesis of Pure‐Phase BiI₃ and BiOI by Electrodeposition**

pH‐Dependent Synthesis of Pure‐Phase BiI₃ and BiOI by Electrodeposition**

Electrochemical Synthesis of Bismuth Iodide and Bismuth Oxyiodide

Single Walled BiI3 Nanotubes Encapsulated within Carbon Nanotubes

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Novel bismuth tri-iodide nanostructures obtained by the hydrothermal method and electron beam irradiation

Cited by 6 publications

References 22 publications

pH‐Dependent Synthesis of Pure‐Phase BiI3 and BiOI by Electrodeposition**

pH‐Dependent Synthesis of Pure‐Phase BiI3 and BiOI by Electrodeposition**

Electrochemical Synthesis of Bismuth Iodide and Bismuth Oxyiodide

Single Walled BiI3 Nanotubes Encapsulated within Carbon Nanotubes

Contact Info

Product

Resources

About

pH‐Dependent Synthesis of Pure‐Phase BiI₃ and BiOI by Electrodeposition**

pH‐Dependent Synthesis of Pure‐Phase BiI₃ and BiOI by Electrodeposition**