Thermal Decomposition of Bismuth Oxysulfide from Photoelectric Bi2O2S to Superconducting Bi4O4S3

Zhang, Xian; Liu, Yufeng; Zhang, Ganghua; Wang, Yingqi; Zhang, Hui; Huang, Fuqiang

doi:10.1021/am5092159

Cited by 122 publications

(100 citation statements)

References 35 publications

(63 reference statements)

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“…Our newly developed hydrothermal synthesis efficiently produces nanostructured Bi 2 O 2 S with high phase purity in water. 8 By using alcohol as solvent and excess KOH as mineralizer, a new layered bismuth oxysulfide of Bi 9 O 7.5 S 6 was obtained as well-defined hexagonal plates as shown from the SEM image in Figure 1a. The EDX analysis of selected regions of the sample revealed the presence of Bi, O, and S elements ( Figure S1, Supporting Information), and the average atomic ratio of Bi/S is 3:2 from different crystals.…”

Section: ■ Results and Discussionmentioning

confidence: 97%

“…Therefore, layered bismuth oxysulfides may be fairly chemically stable and hence be more suitable for solar utilization than BiOCl and Bi 2 S 3 . Recently, Bi 2 O 2 S was demonstrated to be an excellent photoelectric material with E g = 1.12 eV, 8 which is in the optimal band-gap region of 1.0−1.8 eV for solar absorber materials. However, Bi 2 O 2 S is an optically indirect-transition material which may be unable to ensure a high absorption coefficient.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The Bi 9 O 7.5 S 6 sample was synthesized via a reported hydrothermal method. 8 In a typical synthesis, 0.01 mol of Bi(NO) 3 · 5H 2 O, 0.01 mol of SC(NH 2 ) 2 , 5 g of KOH, and 10 g of LiOH were dissolved in a 10 mL of a mixed solution of distilled water and alcohol (volume ratio = 1:1) with continuous stirring. Then the precursors were transferred into a 50 mL Teflon-lined stainless steel autoclave to 75% of its filling capacity.…”

Section: ■ Introductionmentioning

confidence: 99%

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Synthesis, Crystal Structure, and Photoelectric Properties of a New Layered Bismuth Oxysulfide

Sha

Zhang

et al. 2015

Inorg. Chem.

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[Bi2O2]-containing tetragonal compounds have received enormous attention due to unique functions including ferroelectricity, photocatalysis, and superconductivity. Here, a new layered compound Bi9O7.5S6 was synthesized via a facile hydrothermal route. The compound, belonging to a new structure type crystallizes in a rhombohedral system with space group R3̅m (a = 4.0685(1) Å, c = 31.029(5) Å, V = 444.8(1) Å(3), Z = 1). The overall crystal structure consists of alternatively packed unique [Bi2O2] and [BiS2] layers along [001] which are combined with each other by van der Waals interaction. The phase purity of the product is confirmed by powder X-ray diffraction. XPS analyses indicate +3 for Bi and -2 for S atoms. The temperature dependence of resistivity ρ(T) indicates that the semiconducting sample follows the mechanisms of variable range hopping (VRH) and adiabatic small polaron hopping (SPH). The direct-transition band gap, Eg = 1.27 eV derived from optical absorption spectrum, falls in the optimal region of solar absorber materials. Accordingly, the photoelectric measurement demonstrates the potential for applications for photovoltaic devices.

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Section: ■ Results and Discussionmentioning

confidence: 97%

Section: ■ Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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Synthesis, Crystal Structure, and Photoelectric Properties of a New Layered Bismuth Oxysulfide

Sha

Zhang

et al. 2015

Inorg. Chem.

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“…These band gaps are smaller than those observed in Bi9O7.5S6 (1.27 eV [4])and Bi2O2S (ca. 1.12 eV or 1.5 eV [2,3]), which may be related to the overlap between the Bi 6p and S 3p as well as the contribution of the Bi 6s and S 3s orbitals. …”

Section: Experimental and Computationalmentioning

confidence: 99%

“…[1] Bi2O2S is an oxysulfide semiconductor with an indirect gap of approximately 1.12 eV or 1.5 eV, and shows potential for application as photocatalysts and in electro-optics. [2,3] Bi9O7.5S6 is a semiconductor with a direct band gap of 1.27 eV. [4] MOBiS2 (M: Bi, La), which can also be described as Bi2OS2 and LaOBiS2, are isostructural layered oxysulfides and have been extensively studied because their superconductivity were triggered by substituting F − for O 2− .…”

Section: Introductionmentioning

confidence: 99%

Structures and optical absorption of Bi2OS2 and LaOBiS2

Miura

Mizuguchi

Takei

et al. 2016

Solid State Communications

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The band gaps of isostructural Bi2OS2 and LaOBiS2 were examined using optical absorption and discussed with the band structures calculated based on the crystal structures determined using synchrotron X-ray diffraction. The Bi 6p and S 3p orbitals in the Bi-S plane were computationally predicted to constitute the bands near the Fermi level. The optical reflectance spectra of Bi2OS2 and LaOBiS2 showed optical band gaps of ~1.0 eV, which were close to the computationally calculated direct band gaps of ~0.8 eV. Our results show that Bi2OS2 and LaOBiS2 are semiconductors containing direct band gaps of 0.8-1.0 eV, and they are suggested to be candidates for optoelectronic materials in the near-infrared region without highly toxic elements.2

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Catalytic Metal Foam by Chemical Melting and Sintering of Liquid Metal Nanoparticles

Allioux

Merhebi

Tang

et al. 2019

Adv Funct Materials

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Metal foams are highly sought-after porous structures for heterogeneous catalysis, which are fabricated by templating, injecting gas, or admixing blowing agents into a metallic melt at high temperatures. They also require additional catalytic material coating. Here, a low-melting-point liquid metal is devised for the single-step formation of catalytic foams in mild aqueous environments. A hybrid catalytic foam fabrication process is presented via simultaneous chemical foaming, melting, and sintering reaction of liquid metal nanoparticles. As a model, nanoparticles of tertiary low-melting-point eutectic alloy of indium, bismuth, and tin (Field's metal) are processed with sodium hydrogen carbonate, an environmentally benign blowing agent. The competing endothermic foaming and exothermic sintering reactions are triggered by an aqueous acidic bath. The overall foaming process occurs at a localized temperature above 200 °C, producing submicron-to micron-sized open-cell pore foams with conductive cores and semiconducting surface decorations. The catalytic properties of the metal foams are explored for a range of applications including photo-electrocatalysis, bacteria electrofiltration, and CO 2 electroconversion. In particular, the Field's metal-based foams show exceptional CO 2 electrochemical conversion performance at low applied voltages. The facile process presented here can be extended to other lowtemperature post transition and transition metal alloys.

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Thermal Decomposition of Bismuth Oxysulfide from Photoelectric Bi₂O₂S to Superconducting Bi₄O₄S₃

Cited by 122 publications

References 35 publications

Synthesis, Crystal Structure, and Photoelectric Properties of a New Layered Bismuth Oxysulfide

Synthesis, Crystal Structure, and Photoelectric Properties of a New Layered Bismuth Oxysulfide

Structures and optical absorption of Bi2OS2 and LaOBiS2

Catalytic Metal Foam by Chemical Melting and Sintering of Liquid Metal Nanoparticles

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