scholarly journals Structure and Surface Passivation of Ultrathin Cesium Lead-Halide Nanoplatelets Revealed by Multilayer Diffraction

2021 ◽  
Author(s):  
Stefano Toso ◽  
Dmitry Baranov ◽  
Cinzia Giannini ◽  
Liberato Manna
Keyword(s):  
Optical Properties ◽  
Surface Passivation ◽  
Organic Ligands ◽  
X Ray Diffraction ◽  
Bulk Materials ◽  
X Ray ◽  
Natural Tendency ◽  
Halide Perovskite ◽  
Compositional Characterization ◽  
Lead Halide

The research on bidimensional colloidal semiconductors has received a boost from the emergence of ultrathin lead-halide perovskite nanoplatelets. While the optical properties of these materials have been widely investigated, their accurate structural and compositional characterization is still challenging. Here, we exploited the natural tendency of the platelets to stack into highly ordered films, which can be treated as single crystals made of alternating layers of organic ligands and inorganic nanoplatelets, to investigate their structure by Multilayer Diffraction. Using X-ray diffraction alone, this method allowed to refine the structure of ∼12 Å thick Cs-Pb-Br perovskite and ∼25 Å thick Cs-Pb-Cl-I Ruddlesden-Popper nanoplatelets by precisely measuring their thickness, stoichiometry, surface passivation type and coverage, as well as deviations from the crystal structures of the corresponding bulk materials. It is noteworthy that a single, readily available experimental technique, coupled with proper modeling, provides access to such detailed structural and composition information.

Exploring the surface chemistry of cesium lead halide perovskite nanocrystals

Nanoscale ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 986-999 ◽  
Author(s):  
Roberto Grisorio ◽  
Milvia Elena Di Clemente ◽  
Elisabetta Fanizza ◽  
Ignazio Allegretta ◽  
Davide Altamura ◽  
...  
Keyword(s):  
Surface Chemistry ◽  
Surface Passivation ◽  
Organic Ligands ◽  
Perovskite Nanocrystals ◽  
Halide Perovskite ◽  
Lead Halide

The surface passivation by organic ligands of differently composed cesium lead halide perovskite nanocrystals was explored.

Monitoring the Phase Formation of Coevaporated Lead Halide Perovskite Thin Films by in Situ X-ray Diffraction

2014 ◽  
Vol 5 (19) ◽  
pp. 3308-3312 ◽  
Author(s):  
Paul Pistor ◽  
Juliane Borchert ◽  
Wolfgang Fränzel ◽  
René Csuk ◽  
Roland Scheer
Keyword(s):  
Thin Films ◽  
Phase Formation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Halide Perovskite ◽  
Lead Halide

scholarly journals Antisolvent processing of lead halide perovskite thin films studied by in situ X-ray diffraction

2018 ◽  
Vol 6 (39) ◽  
pp. 18865-18870 ◽  
Author(s):  
Karsten Bruening ◽  
Christopher J. Tassone
Keyword(s):  
Thin Films ◽  
X Ray Diffraction ◽  
X Ray ◽  
Halide Perovskite ◽  
Induced Crystallization ◽  
Lead Halide ◽  
Blade Coating

The conversion mechanism from the precursor ink to the perovskite film using antisolvent-induced crystallization has been studied using in situ X-ray diffraction during blade coating and antisolvent deposition.

Synthesis, structural characterization, and properties of three Ag(I) complexes with oxazoline-containing chiral ligands

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Hai-Wei Kuai ◽  
Xiao-Chun Cheng ◽  
Xiao-Hong Zhu
Keyword(s):  
Optical Properties ◽  
Ir Spectroscopy ◽  
Single Crystal ◽  
Structural Characterization ◽  
Nonlinear Optical ◽  
Organic Ligands ◽  
Silver Complexes ◽  
X Ray Diffraction ◽  
X Ray ◽  
Silver Salts

Abstract The two enantiopure chiral organic ligands 2-[(S)-4-isopropyl-2-oxazolyl]quinoline (L1) and 2-[(S)-4-benzyl-2-oxazolyl]quinoline (L2) react with different silver salts to give rise to three new silver complexes [Ag(L1)2](SbF6) (1), [Ag(L1)(CH3CN)](ClO4) (2), and [Ag(L2)(NO3)] (3), which have been characterized by single-crystal X-ray diffraction, IR spectroscopy, elemental and thermogravimetric analyses. Complexes 1–3 all display discrete mononuclear structures. The nonlinear optical properties of 1–3 were investigated.

Structural investigation of co-evaporated methyl ammonium lead halide perovskite films during growth and thermal decomposition using different PbX2 (X = I, Cl) precursors

2015 ◽  
Vol 3 (39) ◽  
pp. 19842-19849 ◽  
Author(s):  
Juliane Borchert ◽  
Heidi Boht ◽  
Wolfgang Fränzel ◽  
René Csuk ◽  
Roland Scheer ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Structural Analysis ◽  
Structural Investigation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Detailed Structural Analysis ◽  
Halide Perovskite ◽  
Lead Halide

Here we present a detailed structural analysis of methylammonium lead halide (I, Cl) films by in situ X-ray diffraction during their growth and thermal recrystallization up to their decomposition.

scholarly journals Halide-bridged Polymers of d10Metals with Heterocyclic Type Donor Ligands

2014 ◽  
Vol 70 (a1) ◽  
pp. C1025-C1025
Author(s):  
Cara Slabbert ◽  
Melanie Rademeyer
Keyword(s):  
Optical Properties ◽  
Self Assembly ◽  
Bulk Composition ◽  
Organic Ligands ◽  
Donor Ligands ◽  
Metal Halides ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
X Ray ◽  
Wide Range

Molecular self-assembly of organic ligands and inorganic metal halides leads to the formation of layered nano-composite organic-inorganic hybrid materials. The formation of both ionic- and coordination hybrids is possible. Both of these materials have attracted much attention recently in the field of Crystal Engineering [1], due to the retention and combination of desired inherent properties of both constitutional moieties, which then renders these materials multifunctional with a wide range of potential technological applications. Properties attributed to the organic component include structural diversity and optical properties [2], with mechanical hardness, electronic-, magnetic- and optical properties ascribed to the inorganic component. The coordination of an organic amine functionality to a metal halide results in the formation of halide-bridged polymers coordinated to donor ligands, with reported properties including non-linear optic (NLO) behavior, magnetic properties [3] and electronic semi-conduction. Literature confirms the technological importance of these materials and identifies the need for research aiming at a fundamental understanding of factors that control the observed structural trends and to relate chemical composition and topology of these compounds to ultimately enable retrosynthesis from desired property. In this study, a range of different divalent d10metal halides are combined with different aromatic nitrogen-containing organic ligands. The effects of change in metal atom, halide atom, stoichiometry and reaction conditions on the structural trends in the crystal systems are investigated. The molecular self-assembly of the said halide-bridged polymers is initiated by simple synthetic techniques under relatively mild conditions, at the most, hydrothermal reaction conditions. Structural characterisation was done employing single crystal X-ray diffraction, while bulk composition of the samples was investigated using powder X-ray diffraction.

Structural and optical properties of Tin Oxide and Indium doped SnO2 thin films deposited by thermal evaporation technique

2016 ◽  
Vol 12 (3) ◽  
pp. 4394-4399
Author(s):  
Sura Ali Noaman ◽  
Rashid Owaid Kadhim ◽  
Saleem Azara Hussain
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Tin Oxide ◽  
Thermal Evaporation ◽  
Pure Sno2 ◽  
X Ray Diffraction ◽  
Structural And Optical Properties ◽  
X Ray ◽  
Evaporation Technique ◽  
Sno2 Thin Films

Tin Oxide and Indium doped Tin Oxide (SnO2:In) thin films were deposited on glass and Silicon  substrates  by  thermal evaporation technique.  X-ray diffraction pattern of  pure SnO2 and SnO2:In thin films annealed at 650oC and the results showed  that the structure have tetragonal phase with preferred orientation in (110) plane. AFM studies showed an inhibition of grain growth with increase in indium concentration. SEM studies of pure  SnO2 and  Indium doped tin oxide (SnO2:In) ) thin films showed that the films with regular distribution of particles and they have spherical shape.  Optical properties such as  Transmission , optical band-gap have been measured and calculated.

New Coordination Compounds of Fe(III) with Organic Ligands

2009 ◽  
Vol 59 (12) ◽  
Author(s):  
Mihaela Flondor ◽  
Ioan Rosca ◽  
Doina Sibiescu ◽  
Mihaela-Aurelia Vizitiu ◽  
Daniel-Mircea Sutiman ◽  
...  
Keyword(s):  
Chemical Analysis ◽  
Complex Compounds ◽  
Organic Ligands ◽  
X Ray Diffraction ◽  
X Ray ◽  
Elemental Chemical Analysis ◽  
Structural Formulae ◽  
Paramagnetic Properties

In this paper the synthesis and the study of some complex compounds of Fe(III) with ligands derived from: 2-(4-chloro-phenylsulfanyl)-1-(2-hydroxy-3,5-diiodo-phenyl)-ethanone (HL1), 1-(3,5-dibromo-2-hydroxy-phenyl)-2-phenylsulfanyl-ethanone(HL2), and 2-(4-chloro-phenylsulfanyl)-1-(3,5-dibromo-2-hydroxy-phenyl)-ethanone (HL3) is presented. The characterization of these complexes is based on method as: the elemental chemical analysis, IR and ESR spectroscopy, M�ssbauer, the thermogravimetric analysis and X-ray diffraction. Study of the IR and chemical analysis has evidenced that the precipitates form are a complexes and the combination ratio of M:L is 1:2. The central atoms of Fe(III) presented paramagnetic properties and a octaedric hybridization. Starting from this precipitation reactions, a method for the gravimetric determination of Fe(III) with this organic ligands has been possible. Based on the experimental data on literature indications, the structural formulae of the complex compounds are assigned.

scholarly journals Study on the Electrical, Structural, Chemical and Optical Properties of PVD Ta(N) Films Deposited with Different N2 Flow Rates

Coatings ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 937
Author(s):  
Yingying Hu ◽  
Md Rasadujjaman ◽  
Yanrong Wang ◽  
Jing Zhang ◽  
Jiang Yan ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Photoelectron Spectroscopy ◽  
Crystal Size ◽  
Silicon Substrates ◽  
X Ray Diffraction ◽  
Dc Magnetron Sputtering ◽  
Flow Rates ◽  
X Ray ◽  
N2 Flow Rate

By reactive DC magnetron sputtering from a pure Ta target onto silicon substrates, Ta(N) films were prepared with different N2 flow rates of 0, 12, 17, 25, 38, and 58 sccm. The effects of N2 flow rate on the electrical properties, crystal structure, elemental composition, and optical properties of Ta(N) were studied. These properties were characterized by the four-probe method, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and spectroscopic ellipsometry (SE). Results show that the deposition rate decreases with an increase of N2 flows. Furthermore, as resistivity increases, the crystal size decreases, the crystal structure transitions from β-Ta to TaN(111), and finally becomes the N-rich phase Ta3N5(130, 040). Studying the optical properties, it is found that there are differences in the refractive index (n) and extinction coefficient (k) of Ta(N) with different thicknesses and different N2 flow rates, depending on the crystal size and crystal phase structure.

scholarly journals Leaching of Chalcopyrite under Bacteria–Mineral Contact/Noncontact Leaching Model

Minerals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 230
Author(s):  
Pengcheng Ma ◽  
Hongying Yang ◽  
Zuochun Luan ◽  
Qifei Sun ◽  
Auwalu Ali ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Surface Passivation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Leaching Process ◽  
Copper Leaching ◽  
Hydrolysis Of ◽  
Leaching Efficiency ◽  
Leaching Models ◽  
Scanning Electron

Bacteria–mineral contact and noncontact leaching models coexist in the bioleaching process. In the present paper, dialysis bags were used to study the bioleaching process by separating the bacteria from the mineral, and the reasons for chalcopyrite surface passivation were discussed. The results show that the copper leaching efficiency of the bacteria–mineral contact model was higher than that of the bacteria–mineral noncontact model. Scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier-transform infrared (FTIR) were used to discover that the leaching process led to the formation of a sulfur film to inhibit the diffusion of reactive ions. In addition, the deposited jarosite on chalcopyrite surface was crystallized by the hydrolysis of the excess Fe3+ ions. The depositions passivated the chalcopyrite leaching process. The crystallized jarosite in the bacteria EPS layer belonged to bacteria–mineral contact leaching system, while that in the sulfur films belonged to the bacteria–mineral noncontact system.

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