Constructing PbI2 nanoparticles into a multilayer structure using the molecular deposition (MD) method

Gao, Mingyuan; Gao, Manglai; Zhang, Xi; Yang, Yi; Yang, Bai; Shen, Jiacong

doi:10.1039/c39940002777

Cited by 65 publications

(37 citation statements)

References 8 publications

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“…By using rigid ionic platelets for ESA, such as exfoliated montmorillonite, hectorite, graphite oxide, a-Zr(HPO 4 ) 2 , or niobates, interdiffusion and interface waviness of the adsorbed layers can be suppressed 195) to such an extent that Bragg peaks may be found in X-ray studies 119, 121, 150, 270, 277, 311-313, 315, 322-324, 435) . Similarly, Bragg peaks occasionally show up for ESAfilms made with aggregates of bolaamphiphiles 79,105,107,109) , or with nanoparticles if the spacer layer is thick enough to avoid overlap of the layers containing the particles 270,286,293,434) . Still, such reports are exceptional.…”

Section: The Structure Of Polymer Films Made By Esamentioning

confidence: 95%

“…Stable colloidal dispersions of charged silica 44,73,[264][265][266][267][268][269] , metal oxides 11,36,42,68,72,121,150,244,264,265,[270][271][272][273][274][275][276][277][278][279][280] , polyoxometalates 211,274,278,[281][282][283][284] , semiconductor nanoparticles 90,107,183,186,261,[270][271][272][284][285][286][287][288][289][290]…”

Section: Polymers Suited For Esamentioning

confidence: 99%

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Ultrathin polymer coatings by complexation of polyelectrolytes at interfaces: suitable materials, structure and properties

Bertrand

Jonas

Laschewsky³

et al. 2000

Macromol. Rapid Commun.

1,168

1,184

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A bit of historyThe key role of surfaces for many material properties as well as for many biological processes has been recognized now. Therefore, new strategies aim at the tailoring of the material's surface only -or of a thin surface layer, respectively -, while preserving the bulk properties of the underlying support. Particular emphasis has been given to the surface modification by polymers, in an attempt to extend the known versatility of polymer bulk materials to ultrathin films and coatings, and to prepare bulk-surface composite materials. The self-organization of polymers has been increasingly explored for the preparation of well-defined surfaces and interfaces in recent years, extending the use of the established methods of low molar mass compounds (for comparative reviews, see ref. 1-3)). With such techniques, polymer films are formed spontaneously on substrates, due to balanced interactions between substrate, polymer (or its precursor) and medium. Typically, very thin, often monomolecular layers are produced. Repetitive deposition steps provide a precise control over the total thickness of the coatings, in the range from a few angstroms up to the micrometer range. Moreover, the step-by-step procedures allow for a fine structuring in the third dimension. In addition to the preparation of uniform and homogeneous coatings, gratings, gradients or steps of defined height in molecular dimensions can be easily constructed.The most recent of the self-organization techniques is the alternating physisorption of oppositely charged polyelectrolytes, the so-called "layer-by-layer" method or "electrostatic self-assembly" (ESA) [3][4][5][6][7][8][9][10] . Although some early, singular studies of self-assembly by alternating adsorption of oppositely charged polyions are reported [11][12][13] , a practical method for ESA was developed Feature Article: The article presents the state-of-the-art of alternating physisorption of oppositely charged polyelectrolytes, the so-called "layer-by-layer" method or "electrostatic self-assembly" (ESA), for the preparation of thin polymer coatings. In comparison to other, more established self-organization techniques, this recent method is distinguished by its simplicity, versatility, and speed. In particular, the tendency for self-healing is unique. Emphasis is given to the role of the molecular structure of the polyelectrolytes, and to the nature of the support. Also, various parameters for the preparation of multilayer films are highlighted, which are very important due to the kinetic control of the build-up process. The structure of the resulting coatings, their quality and stability, chemical reactions in the films, and potential applications are discussed.Macromol. Rapid Commun. 21, No. 7

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Section: The Structure Of Polymer Films Made By Esamentioning

confidence: 95%

Section: Polymers Suited For Esamentioning

confidence: 99%

Ultrathin polymer coatings by complexation of polyelectrolytes at interfaces: suitable materials, structure and properties

Bertrand

Jonas

Laschewsky³

et al. 2000

Macromol. Rapid Commun.

1,168

1,184

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“…Proposed structure for multilayer alternating PbI2 films prepared using a molecular deposition method. 157 emission varied from red to yellow by changing the size of the nanocrystals. More recently, devices fabricated from single nanocrystals have been proposed such as a single-electron transistor based on CdSe nanocrystals, deposited on a SiO 2 /Si substrate using alkanethiols as circuit wires, Figure 10.…”

Section: -6 2mentioning

confidence: 99%

“…156 Nanostructures can also be prepared by the assembly of preformed nanocrystallites, as in the formation of molecular deposition (MD) films via electrostatic attractions between opposite-charged species. 157 Figure 7 shows a schematic structure obtained by the assembly of anionic PbI 2 nanocrystallites using bipolar pyridinium salt as the cationic species. Self-assembled monolayers have been used to attach CdS nanocrystals to metal substrates via carboxylate or alkanedithiol molecules.…”

Section: Processabilitymentioning

confidence: 99%

Nanocrystalline Semiconductors: Synthesis, Properties, and Perspectives

2001

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The synthesis and study of so-called "nanoparticles", particles with diameters in the range of 1-20 nm, has become a major interdisciplinary area of research over the past 10 years. Semiconductor nanoparticles promise to play a major role in several new technologies. The intense interest in this area derives from their unique chemical and electronic properties, which gives rise to their potential use in the fields of nonlinear optics, luminescence, electronics, catalysis, solar energy conversion, and optoelectronics, as well as other areas. The small dimensions of these particles result in different physical properties from those observed in the corresponding macrocrystalline, "bulk", material. As particle sizes become smaller, the ratio of surface atoms to those in the interior increase, leading to the surface properties playing an important role in the properties of the material. Semiconductor nanoparticles also exhibit a change in their electronic properties relative to that of the bulk material; as the size of the solid becomes smaller, the band gap becomes larger. This allows chemists and material scientists the unique opportunity to change the electronic and chemical properties of a material simply by controlling its particle size. Research has already led to the fabrication of a number of devices. This review aims to highlight recent advances in the synthesis of compound semiconductor nanoparticle materials and their potential use in areas such as catalysis and electronic device fabrication.

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“…Indeed, Early work by Shen and co-workers has shown that electrostatic assembled multilayers featuring PbI 2 particles of 3.8 nm exhibit well-defined XRD patterns. [26] The amplitude of F modulation is also determined by the polarisability of the deposited layers. In the case of Au particles of 1.5 AE 0.4 nm, the amplitude of modulation is significantly smaller than for particles of larger diameter.…”

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confidence: 99%

Modulation of the Work Function in Layer‐by‐Layer Assembly of Metal Nanoparticles and Poly‐L‐lysine on Modified Au Surfaces

et al. 2004

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Constructing PbI2 nanoparticles into a multilayer structure using the molecular deposition (MD) method

Abstract: MD films are adopted as matrices for the assembly of Pblz nanoparticles into a layer structure; UV-VIS and X-ray diffraction results prove that the multilayers formed have a well-defined layer structure.

Cited by 65 publications

References 8 publications

Ultrathin polymer coatings by complexation of polyelectrolytes at interfaces: suitable materials, structure and properties

Ultrathin polymer coatings by complexation of polyelectrolytes at interfaces: suitable materials, structure and properties

Nanocrystalline Semiconductors: Synthesis, Properties, and Perspectives

Modulation of the Work Function in Layer‐by‐Layer Assembly of Metal Nanoparticles and Poly‐L‐lysine on Modified Au Surfaces

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