Carbon Nanotubes Filled With Ternary Chalcohalides

Nowak, Marian; Jesionek, Marcin

doi:10.5772/52590

Cited by 3 publications

(2 citation statements)

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“…Chalcohalides are ternary compounds that have lately been re-emerging in the scientific literature. These materials present a combination of interesting electrical and optical properties, which have encouraged their study since 1960 in applications such as sensors, , actuators, radiation detectors, − photodetectors, energy storage devices, etc. − Lately, they have appeared in several reviews as potential candidates as substitutes for lead-based perovskites in photovoltaics. − They are attracting the attention of the scientific community, and the number of studies of these materials in greater detail is increasing. − Bismuth sulfoiodide (BiSI), in particular, has been scarcely studied for technological applications, but results in photovoltaics and ionizing radiation detectors are promising. ,− One of the main attractions of BiSI is that it is made of elements that are nontoxic and relatively abundant, , making their widespread application a more sustainable alternative when comparing it with other semiconductor materials, such as CdTe and CIGS . Moreover, the band structure of BiSI has been observed to have an indirect band gap of 1.57 eV, and it presents electronic characteristics similar to those of lead halide perovskites (which account for their remarkable performance in solar cells), i.e., an ns 2 configuration of the Bi 3+ atom and diffusivity of the band structure .…”

Section: Introductionmentioning

confidence: 99%

Understanding the Crystal Growth of Bismuth Chalcohalide Nanorods through a Self-Sacrificing Template Process: A Comprehensive Study

et al. 2022

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Bismuth-based semiconductors are promising candidates for applications in photocatalysis, photodetection, solar cells, etc. BiSI in particular is attracting attention. It has anisotropic optoelectronic properties and comprises relatively abundant elements. However, the synthesis of this ternary compound presents several challenges. Here, we delve into the underlying chemical processes that lead to the crystal growth of BiSI nanorods and optimize a solution-based synthesis. The mechanism of formation of BiSI nanocrystals is the self-sacrifice of Bi2S3 nanostructures, which also act as templates. The crystallographic similarities between the chalcogenide and the chalcohalide allow for the solid state transformation from one to the other. However, there is also a synergy with the I3 – species formed in the reaction media needed to obtain BiSI. Our method makes use of a green solvent, avoids complicated media, and drastically reduces the reaction time compared to other methods. The obtained nanorods present a band gap of 1.6 eV, in accordance with the reported values. This work presents insight into the chemistry of bismuth-based semiconductors, while introducing an easy, green, and scalable synthesis of a promising material, which could also be applied to similar compounds and other chalcoiodides, such as SbSI. In addition, the optical properties of the BiSI nanorods show their potential in photovoltaic applications.

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Section: Introductionmentioning

confidence: 99%

Understanding the Crystal Growth of Bismuth Chalcohalide Nanorods through a Self-Sacrificing Template Process: A Comprehensive Study

et al. 2022

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“…The obtained hybrid materials usually exhibit novel functional properties with respect to the empty nanotubes and bulk guest species mainly due to atypical low-dimensional structure and specific interaction between the components, such as magnetic, donor-acceptor, etc. [4,[11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Light-Induced Sulfur Transport inside Single-Walled Carbon Nanotubes

et al. 2020

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Filling of single-walled carbon nanotubes (SWCNTs) and extraction of the encapsulated species from their cavities are perspective treatments for tuning the functional properties of SWCNT-based materials. Here, we have investigated sulfur-modified SWCNTs synthesized by the ampoule method. The morphology and chemical states of carbon and sulfur were analyzed by transmission electron microscopy, Raman scattering, thermogravimetric analysis, X-ray photoelectron and near-edge X-ray absorption fine structure spectroscopies. Successful encapsulation of sulfur inside SWCNTs cavities was demonstrated. The peculiarities of interactions of SWCNTs with encapsulated and external sulfur species were analyzed in details. In particular, the donor–acceptor interaction between encapsulated sulfur and host SWCNT is experimentally demonstrated. The sulfur-filled SWCNTs were continuously irradiated in situ with polychromatic photon beam of high intensity. Comparison of X-ray spectra of the samples before and after the treatment revealed sulfur transport from the interior to the surface of SWCNTs bundles, in particular extraction of sulfur from the SWCNT cavity. These results show that the moderate heating of filled nanotubes could be used to de-encapsulate the guest species tuning the local composition, and hence, the functional properties of SWCNT-based materials.

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