Prospects of Nanoscience with Nanocrystals

Kovalenko, Maksym V.; Manna, Liberato; Cabot, Andreu; Hens, Zeger; Talapin, Dmitri V.; Kagan, Cherie R.; Klimov, Victor I.; Rogach, Andrey L.; Reiß, Peter; Milliron, Delia J.; Guyot-Sionnnest, Philippe; Konstantatos, Gerasimos; Parak, Wolfgang J.; Hyeon, Taeghwan; Korgel, Brian A.; Murray, Christopher B.; Heiß, Wolfgang

doi:10.1021/nn506223h

Cited by 1,060 publications

(1,127 citation statements)

References 533 publications

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“…The introduction of capping agents adsorbed on surface is to inhibit the further enlarge of the particles. Modifying the surface chemistry of nanoparticles is the first consideration of nanomaterial applications 127. By selecting proper capping to cap the facets, we can deposit other wanted materials on the active edges and corners.…”

Section: Novel Structures and Atypical Edgesmentioning

confidence: 99%

Face the Edges: Catalytic Active Sites of Nanomaterials

Wang

2015

Advanced Science

151

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Edges are special sites in nanomaterials. The atoms residing on the edges have different environments compared to those in other parts of a nanomaterial and, therefore, they may have different properties. Here, recent progress in nanomaterial fields is summarized from the viewpoint of the edges. Typically, edge sites in MoS2 or metals, other than surface atoms, can perform as active centers for catalytic reactions, so the method to enhance performance lies in the optimization of the edge structures. The edges of multicomponent interfaces present even more possibilities to enhance the activities of nanomaterials. Nanoframes and ultrathin nanowires have similarities to conventional edges of nanoparticles, the application of which as catalysts can help to reduce the use of costly materials. Looking beyond this, the edge structures of graphene are also essential for their properties. In short, the edge structure can influence many properties of materials.

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Section: Novel Structures and Atypical Edgesmentioning

confidence: 99%

Face the Edges: Catalytic Active Sites of Nanomaterials

Wang

2015

Advanced Science

151

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“…Besides, the size is so small that the spacing of electronic states is much greater than thermal energy [1,3], and the emission of light results independent of temperature. As a consequence, semiconductor nanocrystals become a flexible choice to develop a broad a e-mail: isaac.suarez@uv.es range of optoelectronic applications where the absorption and emission of light is required [4]. Examples include waveguides [5], microcavities [6], displays [7], LEDs [8], lasers [9], photodetectors [10], solar cells [11] or optical transistors and memories [12].…”

Section: Introductionmentioning

confidence: 99%

Active photonic devices based on colloidal semiconductor nanocrystals and organometallic halide perovskites

Suárez¹

2016

Eur. Phys. J. Appl. Phys.

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Abstract. Semiconductor nanocrystals have arisen as outstanding materials to develop a new generation of optoelectronic devices. Their fabrication under simple and low cost colloidal chemistry methods results in cheap nanostructures able to provide a wide range of optical functionalities. Their attractive optical properties include a high absorption cross section below the band gap, a high quantum yield emission at room temperature, or the capability of tuning the band-gap with the size or the base material. In addition, their solution process nature enables an easy integration on several substrates and photonic structures. As a consequence, these nanoparticles have been extensively proposed to develop several photonic applications, such as detection of light, optical gain, generation of light or sensing. This manuscript reviews the great effort undertaken by the scientific community to construct active photonic devices based on these nanoparticles. The conditions to demonstrate stimulated emission are carefully studied by comparing the dependence of the optical properties of the nanocrystals with their size, shape and composition. In addition, this paper describes the design of different photonic architectures (waveguides and cavities) to enhance the generation of photoluminescence, and hence to reduce the threshold of optical gain. Finally, semiconductor nanocrystals are compared to organometallic halide perovskites, as this novel material has emerged as an alternative to colloidal nanoparticles.

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“…1 Nanoparticle thin-film devices are studied and applied in various contexts, especially with regard to their optoelectronic and electronic properties. 2 The solution processability of nanoparticle building blocks makes them particularly attractive for applications such as photovoltaics, [3][4][5][6] light emitting diodes, [7][8][9] as well as chemical sensing and photodetection.…”

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confidence: 99%

Metal Domain Size Dependent Electrical Transport in Pt-CdSe Hybrid Nanoparticle Monolayers

Meyns¹,

Willing²,

Lehmann³

et al. 2015

ACS Nano

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Thin films prepared of semiconductor nanoparticles are promising for low-cost electronic applications such as transistors and solar cells. One hurdle for their breakthrough is their notoriously low conductivity. To address this, we precisely decorate CdSe nanoparticles with platinum domains of one to three nanometers in diameter by a facile and robust seeded growth method. We demonstrate the transition from semiconductor to metal dominated conduction in monolayered films. By adjusting the platinum content in such solutionprocessable hybrid, oligomeric nanoparticles the dark currents through deposited arrays become tunable while maintaining electronic confinement and photoconductivity.Comprehensive electrical measurements allow determining the reigning charge transport mechanisms.Keywords: Colloidal hybrid nanoparticles, electrical transport, photoconductivity, size effects, Langmuir-Blodgett deposition 2 Continuous progress in the control of nanoparticle (NP) size, composition, and shape has led to unprecedented possibilities in material design targeting applications as diverse as medical therapy and diagnostics and solid state devices. 1 Nanoparticle thin-film devices are studied and applied in various contexts, especially with regard to their optoelectronic and electronic properties. 2 The solution processability of nanoparticle building blocks makes them particularly attractive for applications such as photovoltaics, 3-6 light emitting diodes, 7-9 as well as chemical sensing and photodetection. [10][11][12][13][14] The fundamental electrical properties of single material systems consisting of either semiconductor or metal nanoparticles have been studied especially with respect to quantum-mechanical coupling phenomena, [15][16][17][18][19][20] Coulombblockade behavior, 21,22 transistor characteristics, [23][24][25] and photo conductivity. 20,26,27 Nanoparticles prepared by colloidal chemistry can be arranged into ordered arrays by a variety of methods. Among them are the widely applied spin-coating, self-assembly, 28,29 and the Langmuir-Blodgett technique. 30 In particular, the latter relies on a stabilizing layer of organic surfactants that enables the dispersion and assembly of nanoparticles on a liquid sub-phase. While highly ordered films can be achieved, a big drawback of this method is the creation of spatial and energetic barriers between adjacent nanoparticles by the organic stabilizers. This usually leads to a high resistivity of the arrays. 31 (CZTS) and Au were recently reported to improve the photoresponse and -stability compared to pure CZTS multi-layered photodetectors. 51 Increasing the current in a semiconductor nanoparticle array by deposition of metallic domains seems intuitive. Anyhow, it is less clear how the metal domain size and thus the degree of coupling between the domains influences the dark and especially the photocurrents. In the following, we report on the synthesis of well-defined oligomeric Pt-CdSe HNPs by a simple seeded-growth approach and the effect of Pt domain size ...

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Prospects of Nanoscience with Nanocrystals

Cited by 1,060 publications

References 533 publications

Face the Edges: Catalytic Active Sites of Nanomaterials

Face the Edges: Catalytic Active Sites of Nanomaterials

Active photonic devices based on colloidal semiconductor nanocrystals and organometallic halide perovskites

Metal Domain Size Dependent Electrical Transport in Pt-CdSe Hybrid Nanoparticle Monolayers

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