Hybrid Colloidal Heterostructures of Anisotropic Semiconductor Nanocrystals Decorated with Noble Metals: Synthesis and Function

Vaneski, Aleksandar; Susha, Andrei S.; Rodrı́guez-Fernández, Jessica; Berr, Maximilian J.; Jäckel, Frank; Feldmann, Jochen; Rogach, Andrey L.

doi:10.1002/adfm.201002444

Cited by 124 publications

(114 citation statements)

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“…19,[38][39][40][41][42] Colloidal oligomeric hybrid nanoparticles (HNPs) offer the possibility to tailor material combinations for advanced applications in the fields of photocatalysis and (opto-)electronics. 43,44 A number of studies have demonstrated the excellent photo-catalytic properties of metal-semiconductor HNPs in liquid solution, which are based on an efficient separation of photogenerated charge carriers. 45 The electrons move towards the metallic part of the HNPs from where they can be 3 transferred to reducible species in the solution.…”

mentioning

confidence: 99%

“…Pt-semiconductor combinations belong to the most powerful photocatalysts. 44 Despite the plentitude of photocatalytic studies and the often applied description of HNPs as promising candidates for optoelectronic applications, only few studies have investigated their electrical characteristics in solid-state devices in detail. Depending on the combination of materials, the characteristics of HNP thin films vary significantly.…”

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confidence: 99%

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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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confidence: 99%

mentioning

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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“…H ybrid nanostructures have become an important class of nanomaterials that can allow integration of distinct components (denoted as 'subunits') with different functionalities and have facilitated unique synergistic coupling effects [1][2][3][4][5] . As compared with concentric core-shell configuration whose surface chemistry is merely determined by the outermost shell component and is uniform 6,7 , non-centrosymmetric arrangement of functional subunits in a hybrid nanostructure (denoted as 'nc-HN') can lead to new topological properties because each subunit can provide surface functional moieties with asymmetric synergistic coupling.…”

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confidence: 99%

Hierarchical synthesis of non-centrosymmetric hybrid nanostructures and enabled plasmon-driven photocatalysis

et al. 2014

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Non-centrosymmetric nanostructures consisting of multiple functional subunits represents an emerging class of hybrid nanostructures that can possess dramatic difference in property and functionality from concentric core-shell configuration. Here we develop a general synthetic method to achieve hierarchical control of high-order non-centrosymmetric hybrid nanostructures. The key is to employ a common intermedium for sequential conversion to all distinct predesigned subunits under similar growth condition, thus facilitating manifold control of a hybrid nanostructure. This advancement leads to an optimally designed plasmonmediated photocatalytic nanostructure with 14.8-fold enhancement of photocatalytic efficiency as compared with conventional photocatalysts. Mechanistic study involving theoretical modelling and ultrafast time-resolved optical measurement uncovers a hot plasmonic electron-driven photocatalysis mechanism with an identified electron transfer pathway. This study may represent an important step towards high-level control of artificial nanostructures with new horizons for fundamental and technological applications.

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“…Among them, i) heterodimers made of spherical domains [29,33,[38][39][40][41][42][43][44], ii) dumbbell-like HYNCs based on the selective growth of domains on one or both tips of a nanorods (NRs) [31,32,34,[45][46][47][48], and iii) other structures such as branched or pyramidal-shaped NCs decorated with several domains [45,49,50]. In all of these cases, the increased and often new functionality coming from the synergetic combination of parent properties allows to expand the already wide applicability of NCs [28,51,52]. HYNCs in which spherical, rod or branched sections are connected in a controlled morphology present promises for a number of potential uses ranging from nanoelectronics to biomedical, photovoltaic and catalytic applications [52][53][54].…”

Section: Hybrid Nanostructuresmentioning

confidence: 99%

Exploring New Synthetic Strategies for the Production of Advanced Complex Inorganic Nanocrystals

Bastús

González

Esteve

et al. 2014

Zeitschrift Für Physikalische Chemie

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Abstract:The design of new protocols for the colloidal synthesis of complex nanocrystals (NCs) with advanced functionalities, comprising both hybrid and hollow structures, and the study of their fundamental properties is of paramount importance for the development of a new generation of nanostructured materials. The possibility of tailoring the dimensional regime of NCs, along with its composition and structure, represents a landmark achievement in the control of their unique physico-chemical properties. These properties, alongside with the ability to cheaply produce high quality NCs in fairly large amounts by wetchemistry techniques, leads to their potential applicability from materials science to nanomedicine. Within this context, this review is focused on describing a successful framework for designing synthetic strategies for the production of advanced complex NCs, integrating the development of new synthetic methods with its structural characterization, monitoring of their properties, and study of its reactivity. As a result, it is expected to provide new routes to produce robust and easy-to-process NCs in a wide range of sizes, shapes and configurations that can be explored to achieve the combination of all degrees of control, aiming to produce a complete and diverse library of material combinations that will expand its applicability in a wide diversity of fields.

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Hybrid Colloidal Heterostructures of Anisotropic Semiconductor Nanocrystals Decorated with Noble Metals: Synthesis and Function

Cited by 124 publications

References 73 publications

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

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

Hierarchical synthesis of non-centrosymmetric hybrid nanostructures and enabled plasmon-driven photocatalysis

Exploring New Synthetic Strategies for the Production of Advanced Complex Inorganic Nanocrystals

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