A Bottom-Up Approach toward Fabrication of Ultrathin PbS Sheets

Acharya, Somobrata; Das, Bidisa; Thupakula, Umamahesh; Ariga, Katsuhiko; Sarma, D. D.; Israelachvili, Jacob N.; Golan, Yuval

doi:10.1021/nl303568d

Cited by 94 publications

(82 citation statements)

References 36 publications

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“…In this section, we describe the growth of large structures obtained by assembly of colloidal nanocrystals. [170][171][172] Here we voluntarily discard the "usual" self-assembly of nanocrystals which has been discussed in several reviews [173][174][175] to focus on the self-assembly occurring during the synthesis and leading to an epitaxial connection between the nanocrystals. We in particular focus on lead chalcogenides (IV-VI compounds)…”

Section: Self-assemblymentioning

confidence: 99%

Two-Dimensional Colloidal Nanocrystals

et al. 2016

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Abstract:In this paper, we review recent progresses on colloidal growth of 2D nanocrystals.We identify four main sources of anisotropy which lead to the formation of plate-and sheetlike colloidal nanomaterials. Defect induced anisotropy is a growth method which relies on the presence of topological defects at the nanoscale to induce 2D shapes objects. Such a method is particularly important in the growth of metallic nanoobjects. Another way to induce anisotropy is based on ligand engineering. The availability of some nanocrystal facets can be tuned by selectively covering the surface with ligands of tunable thickness. Cadmium chalcogenides nanoplatelets (NPLs) strongly rely on this method which offers atomic control in the thinner direction, down to a few monolayers. 2D objects can also be obtained by post or in situ self-assembly of nanocrystals. This growth method differs from the previous ones in the sense that the elementary objects are not molecular precursors, and is a common method for lead chalcogenide compounds. Finally, anisotropy may simply rely on the lattice anisotropy itself as it is common for rod-like nanocrystals. Colloidally grown Transition Metal DiChalcogenides (TMDC) in particular result from such process. We also present hybrid syntheses which combine several of the previously described methods and other paths, such as cation exchange, which expand the range of available materials. Finally, we discuss in which sense 2D-objects differ from 0D nanocrystals and review some of their applications in optoelectronics, including lasing and photodetection, and biology.

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Section: Self-assemblymentioning

confidence: 99%

Two-Dimensional Colloidal Nanocrystals

et al. 2016

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“…Metal chalcogenide nanosheets of PbS were realized by collective coalescence of PbS nanowires at an airwater interface with the aid of surface pressure using the LangmuirBlodgett technique (Figure 5c). 129 PbS nanowires were first synthesized using single molecular precursor in trioctylamine surfactants.…”

Section: Chemical Vapor Deposition (Cvd)mentioning

confidence: 99%

Two-Dimensional (2D) Nanomaterials towards Electrochemical Nanoarchitectonics in Energy-Related Applications

Khan

Ghosh

Pradhan

et al. 2017

Bulletin of the Chemical Society of Japan

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includes self-assembled fullerene crystals design from zero-to-higher dimensions, mesoporous fullerene crystals and their conversion into graphitic mesoporous carbons, high surface area nanoporous carbon material design from agro-waste for electrochemical supercapacitors and VOC adsorption. Somobrata AcharyaSomobrata Acharya received his Ph.D. degree from Jadavpur University, India. He is currently Associate Professor in the Centre for Advanced Materials (CAM), Indian Association for the Cultivation of Science (IACS), India. He is carrying out research in interdisciplinary areas probing structure-property relationship and possible applications of semiconductor nanomaterials in the areas of energy generation and consumption. His research area includes heterostructures, 2D nanostructures, superlattices, supramolecular assemblies and their suitable applications. Katsuhiko ArigaKatsuhiko Ariga received his Ph.D. degree from Tokyo Institute of Technology. He is currently the Director of Supermolecules Group and Principal Investigator of World Premier International (WPI) Research Centre for Materials Nanoarchitectonics (MANA), the National Institute for Materials Science (NIMS). His research is oriented to supramolecular chemistry, surface science, and functional nanomaterials (Langmuir-Blodgett film, layer-by-layer assembly, self-organized materials, sensing and drug delivery, molecular recognition, mesoporous material, etc. and he is now trying to combine them into a unified field. AbstractDesigning nanoscale components and units into functional defined systems and materials has recently received attention as a nanoarchitectonics approach. In particular, exploration of nanoarchitectonics in two-dimensions (2D) has made great progress these days. Basically, 2D nanomaterials are a center of interest owing to the large surface areas suitable for a variety of surface active applications. The increasing demands for alternative energy generation have significantly promoted the rational design and fabrication of a variety of 2D nanomaterials since the discovery of graphene. In 2D nanomaterials, the charge carriers are confined along the thickness while being allowed to move along the plane. Owing to the large planar area, 2D nanomaterials are highly sensitive to external stimuli, a characteristic suitable for a variety of surface active applications including electrochemistry. Because of the unique

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“…Moreover, the ultrathin 1D nanostructures with size of 1-2 nm is rarely studied due to the lack of preparation methods for such materials. [7][8][9][10][11][12] In this work, we report a universal method through the construction of inorganic-surfactant mesostructures to synthesize such ultrathin 1D nanostructures, including transition metal oxides and rare earth oxides.…”

Section: Researcher Informationmentioning

confidence: 99%