A low band gap iron sulfide hybrid semiconductor with unique 2D [Fe16S20]8− layer and reduced thermal conductivity

Wu, Min; Rhee, Jessica; Emge, Thomas J.; Yao, Hong‐Bin; Cheng, Jen Hau; Thiagarajan, Suraj Joottu; Croft, Mark; Yang, Ronggui; Li, Jing

doi:10.1039/b920118a

Cited by 29 publications

(38 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Note that d-p hybridization can, however, enhance the pre-edge feature intensity by introducing stronger dipole allowed transitions. The tetrahedral Fe-Se environment in K 0.8 Fe 1.6+x Se 2 , and the Fe-S environment in Fe-S-en (en= ethylenediamine) [21], are non-centrosymmetric with d-p hybridization allowed and their pre-edges are both seen to be substantially enhanced in intensity.…”

Section: Resultsmentioning

confidence: 95%

Local structure of the superconductor K0.8Fe1.6+xSe2

et al. 2012

View full text Add to dashboard Cite

The local structure of superconducting single crystals of K 0.8 Fe 1.6+x Se 2 with Tc = 32.6 K was studied by x-ray absorption spectroscopy. Near-edge spectra reveal that the average valence of Fe is 2+. The room temperature structure about the Fe, K and Se sites was examined by iron, selenium and potassium K-edge measurements. The structure about the Se and Fe sites shows a high degree of order in the nearest neighbor Fe-Se bonds. On the other hand, the combined Se and K local structure measurements reveal a very high level of structural disorder in the K layers. Temperature dependent measurements at the Fe sites show that the Fe-Se atomic correlation follows that of the Fe-As correlation in the superconductor LaFeAsO 0.89 F 0.11 -having the same effective Einstein temperature (stiffness). In K 0.8 Fe 1.6+x Se 2 , the nearest neighbor Fe-Fe bonds has a lower Einstein temperature and higher structural disorder than in LaFeAsO 0.89 F 0.11 . The moderate Fe site and high K site structural disorder is consistent with the high normal state resistivity seen in this class of materials. For higher shells, an enhancement of the second nearest neighbor Fe-Fe correlation is found just below Tc possibly due to changes in magnetic or local structural ordering.

show abstract

Section: Resultsmentioning

confidence: 95%

Local structure of the superconductor K0.8Fe1.6+xSe2

et al. 2012

View full text Add to dashboard Cite

show abstract

“…[7,8] Pyrite (FeS 2 ) NWs, nanorib-bons, and nanotubes [9] have also been synthesized in en owing to their chelating properties. [13] We developed a binary mixed solution strategy for the synthesis of [Fe 18 S 25 ](TETAH) 14 (TETAH = protonated triethylenetetramine) NWs by a hydrothermal process using small-molecule amines as crystal growth modifiers. [11,12] The successful incorporation of two distinctly different components into a single-crystal lattice has enabled us to develop a brand new family of semiconductor materials with significantly enhanced properties and unprecedented new phenomena.…”

Section: Introductionmentioning

confidence: 99%

“…[21] Herein, we report the synthesis of Fe 7 S 8 NWs through the thermal decomposition of [Fe 16 S 20 ]/DETA (DETA = diethylenetriamine) hybrid NWs [13] and their intrinsic peroxidase-like activities, which can catalyze the oxidation of substrates, such as 3,3',5,5'-tetramethylbenzidine (TMB), to produce a blue color with H 2 O 2 . [21] Herein, we report the synthesis of Fe 7 S 8 NWs through the thermal decomposition of [Fe 16 S 20 ]/DETA (DETA = diethylenetriamine) hybrid NWs [13] and their intrinsic peroxidase-like activities, which can catalyze the oxidation of substrates, such as 3,3',5,5'-tetramethylbenzidine (TMB), to produce a blue color with H 2 O 2 .…”

Section: Introductionmentioning

confidence: 99%

Intrinsic Peroxidase Catalytic Activity of Fe₇S₈ Nanowires Templated from [Fe₁₆S₂₀]/Diethylenetriamine Hybrid Nanowires

Yao

Zhu

et al. 2013

ChemPlusChem

View full text Add to dashboard Cite

Iron sulfide compounds are emerging as an important family of functional materials owing to their important properties and their applications in different technical fields. Well‐defined Fe7S8 nanowires templated by thermal decomposition of [Fe16S20]/diethylenetriamine hybrid nanowires under an argon atmosphere are reported. As‐prepared Fe7S8 nanowires show typical Michaelis–Menten kinetics and good affinity to both H2O2 and 3,3′,5,5′‐tetramethylbenzidine. At pH 7.0, the constructed UV/Vis sensor showed a linear range for the detection of H2O2 from 0.5 to 150 μM with a correlation coefficient of 0.9998. The H2O2 sensor based on the Fe7S8 nanowires shows a highly sensitive response and has better stability than horseradish peroxidase when exposed to solutions with different pH values and temperatures. These excellent properties make the as‐prepared Fe7S8 nanowires powerful tools for potential applications as an “artificial peroxidase” in biosensors and biotechnology.

show abstract

“…Introducing transition metal ions into solvothermal reactions involving antimony selenide and organic amines generally results in the formation of anionic selenoantimonates together with a charge‐balancing cationic transition metal complex such as [Fe(en) 3 ] 2 [Sb 2 Se 5 ],10 [Ga(en) 3 ]SbSe 4 ,11 and others 12–19. The organic spacers play an important role in the thermal behavior of these materials and typically reduce their thermal conductivity 20,21…”

Section: Introductionmentioning

confidence: 99%

Layered Hybrid Selenoantimonates with Reduced Thermal Conductivity

Chen

Yao

Thiagarajan

et al. 2012

Zeitschrift anorg allge chemie

Self Cite

View full text Add to dashboard Cite

Four ternary selenoantimonates, Ag2SbSe3(enH) (I), KCu2SbSe3 (II), Cu2SbSe3(pdaH2)0.5 (III), and Cu2SbSe3(bdaH2)0.5 (IV) (en = ethylenediamine, pda = propanediamine, bda = butanediamine) were synthesized by solvothermal reactions using amines as solvents. The structures consist of M/Sb (M = Cu, Ag) intermetallic layers connected by either protonated amines or potassium ions. The optical bandgaps of these compounds were estimated from their optical absorption spectra (Kubelka‐Munk function) with the values ranging from 0.9 to 1.8 eV. Thermal conductivity measurements were carried out on I, III, and IV, as well as on related compounds Cu2SbSe3(en)0.5 and Cu2SbSe3(en). In comparison with the inorganic counterpart compound CuSbSe2, the hybrid structures clearly show significantly reduced thermal conductivity, as a result of incorporation of inorganic‐organic interface. The study demonstrates an effective approach to enhance the thermoelectric efficiency of such material systems.

show abstract

A low band gap iron sulfide hybrid semiconductor with unique 2D [Fe16S20]8− layer and reduced thermal conductivity

Abstract: A low band gap iron sulfide hybrid semiconductor with unique layered structure and unusual iron coordination exhibits significantly reduced thermal conductivity.

Cited by 29 publications

References 34 publications

Local structure of the superconductor K0.8Fe1.6+xSe2

Local structure of the superconductor K0.8Fe1.6+xSe2

Intrinsic Peroxidase Catalytic Activity of Fe₇S₈ Nanowires Templated from [Fe₁₆S₂₀]/Diethylenetriamine Hybrid Nanowires

Layered Hybrid Selenoantimonates with Reduced Thermal Conductivity

Contact Info

Product

Resources

About

A low band gap iron sulfide hybrid semiconductor with unique 2D [Fe16S20]8− layer and reduced thermal conductivity

Abstract: A low band gap iron sulfide hybrid semiconductor with unique layered structure and unusual iron coordination exhibits significantly reduced thermal conductivity.

Cited by 29 publications

References 34 publications

Local structure of the superconductor K0.8Fe1.6+xSe2

Local structure of the superconductor K0.8Fe1.6+xSe2

Intrinsic Peroxidase Catalytic Activity of Fe7S8 Nanowires Templated from [Fe16S20]/Diethylenetriamine Hybrid Nanowires

Layered Hybrid Selenoantimonates with Reduced Thermal Conductivity

Contact Info

Product

Resources

About

Intrinsic Peroxidase Catalytic Activity of Fe₇S₈ Nanowires Templated from [Fe₁₆S₂₀]/Diethylenetriamine Hybrid Nanowires