Photostimulated structural changes in yellow arsenic

Rodionov, А. N.; Kalendarev, R.; Eiduss, J.

doi:10.1088/0953-8984/7/29/008

Cited by 10 publications

(8 citation statements)

References 17 publications

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“…This absence suggests that the Raman lasers may induce the conversion of As 4 molecules to the two types of linear chains,a nalogously to the conversion of yellow to gray arsenic triggered by light. [14] Overall, the Raman spectra of empty and As@SWCNT recorded with three different excitation wavelengths are very similar, suggesting weak electronic interactions between SWCNTs and the arsenic filling material. [30] Therefore,t he new arsenic nanostructures are stabilized primarily by the geometry of the cylindrical confinement.…”

Section: Angewandte Chemiementioning

confidence: 83%

“…[13] However,due to its extreme sensitivity to light and X-rays,which trigger the conversion to gray arsenic, no crystallographic data has been collected so far for the bulk material. [14] In addition to the bulk allotropes,clusters in size up to As 5 have been found experimentally. [15] Nanostructures that may exist between these small clusters and the twodimensional sheets of arsenene have so far not been identified.…”

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confidence: 97%

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One‐Dimensional Arsenic Allotropes: Polymerization of Yellow Arsenic Inside Single‐Wall Carbon Nanotubes

et al. 2018

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The pnictogen nanomaterials, including phosphorene and arsenene, display remarkable electronic and chemical properties. Yet, the structural diversity of these main group elements is still poorly explored. Here we fill single-wall carbon nanotubes with elemental arsenic from the vapor phase. Using electron microscopy, we find chains of highly reactive As molecules as well as two new one-dimensional allotropes of arsenic: a single-stranded zig-zag chain and a double-stranded zig-zag ladder. These linear structures are important intermediates between the gas-phase clusters of arsenic and the extended sheets of arsenene. Raman spectroscopy indicates weak electronic interaction between the arsenic and the nanotubes which implies that the formation of the new allotropes is driven primarily by the geometry of the confinement. The relative stabilities of the new arsenic structures are estimated computationally. Band-gap calculations predict that the insulating As chains become semiconducting, once converted to the zig-zag ladder, and form a fully metallic allotrope of arsenic as the zig-zag chain.

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Section: Angewandte Chemiementioning

confidence: 83%

mentioning

confidence: 97%

One‐Dimensional Arsenic Allotropes: Polymerization of Yellow Arsenic Inside Single‐Wall Carbon Nanotubes

et al. 2018

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show abstract

“…This absence suggests that the Raman lasers may induce the conversion of As4 molecules to the two types of linear chains, analogously to the conversion of yellow to gray arsenic triggered by light. [14] Overall, the Raman spectra of empty and As@SWCNT recorded with three different excitation wavelengths are very similar, suggesting weak electronic interactions between SWCNTs and the arsenic filling material. [30] Therefore, the new arsenic nanostructures are stabilized primarily by the geometry of the cylindrical confinement.…”

Section: (D)mentioning

confidence: 83%

“…[13] However, due to its extreme sensitivity to light and X-rays, which trigger the conversion to gray arsenic, no crystallographic data has been collected so far for the bulk material. [14] In addition to the bulk allotropes, clusters in size up to As5 have been found experimentally. [15] Nanostructures that may exist between these small clusters and the two-dimensional sheets of arsenene have so far not been identified.…”

mentioning

confidence: 98%

One‐Dimensional Arsenic Allotropes: Polymerization of Yellow Arsenic Inside Single‐Wall Carbon Nanotubes

et al. 2018

View full text Add to dashboard Cite

The pnictogen nanomaterials, including phosphorene and arsenene, display remarkable electronic and chemical properties. Yet, the structural diversity that these main group elements are capable of is still poorly explored. Here we fill single-wall carbon nanotubes with elemental arsenic from the vapor phase. Using electron microscopy, we find chains of highly reactive As4 molecules as well as two new one-dimensional allotropes of arsenic: a single-stranded zigzag chain and a double-stranded zigzag ladder. These linear structures are important intermediates between the gas-phase clusters of arsenic and the extended sheets of arsenene. Raman spectroscopy indicates weak electronic interaction between the arsenic and the nanotubes which implies that the formation of the new allotropes is driven primarily by the geometry of the confinement. The relative stabilities of the new arsenic structures are estimated computationally. Band-gap calculations predict that the insulating As4 chains become semiconducting, once converted to the zigzag ladder, and form a fully metallic allotrope of arsenic as the zigzag chain.

show abstract

“…27 However, due to its extreme sensitivity towards light and X-rays, which trigger the conversion to gray arsenic, no crystallographic data is available for γ-As. 28 In addition to the bulk allotropes, gas-phase clusters in size up to As5 have been identified experimentally. 29 Arsenene, the arsenic equivalent of phosphorene, displays a large bandgap [30][31] which, combined with a low thermal conductivity, makes it a highly desirable material for thermoelectric applications.…”

Section: Introductionmentioning

confidence: 99%

One-Dimensional Pnictogen Allotropes inside Single-Wall Carbon Nanotubes

et al. 2019

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The discovery of phosphorene, a single layer of black phosphorus, has accelerated the investigation of pnictogen nanomaterials, leading to the recent identification of arsenene and antimonene. These two-dimensional nanomaterials display physical properties superior to graphene for some applications. Recently, single-wall carbon nanotubes (SWCNTs) have been filled with P4 molecules from the melt and As4 molecules from the vapor phase. Confined within SWCNTs, polymerization reactions yielded new one-dimensional pnictogen allotropes. Here, we show using high-resolution electron microscopy that such nanostructures can also be observed upon filling SWCNTs from the vapor phase using red phosphorus as the source material. Using larger diameter SWCNTs, the vapor phase favors the formation of double-stranded phosphorus zigzag ladders observed here for the first time. Overall, however, SWCNTs were generally found to fill more efficiently with liquid phosphorus; substantial decreases in the filling yields were observed for both phosphorus and arsenic filling of narrow SWCNTs using the vapor route. Attempts to extend the pnitogen series, using molten antimony gave very low filling yields. However, the antimony zigzag ladder was observed on two occasions suggesting that this structural motif dominates across the pnictogens. Computational predictions of the encapsulation energies of the various pnictogen nanostructures are consistent with the observed experimental trends and band gap calculations predict that the single-stranded zigzag chains of all investigated pnictogens are fully metallic. Using SWCNTs with diameters greater than 1.5 nm displayed a plethora of complex new phosphorus nanostructures which highlights an exciting new avenue for future work in this area.

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Photostimulated structural changes in yellow arsenic

Cited by 10 publications

References 17 publications

One‐Dimensional Arsenic Allotropes: Polymerization of Yellow Arsenic Inside Single‐Wall Carbon Nanotubes

One‐Dimensional Arsenic Allotropes: Polymerization of Yellow Arsenic Inside Single‐Wall Carbon Nanotubes

One‐Dimensional Arsenic Allotropes: Polymerization of Yellow Arsenic Inside Single‐Wall Carbon Nanotubes

One-Dimensional Pnictogen Allotropes inside Single-Wall Carbon Nanotubes

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