Preparation and Electrical Properties of Cobalt−Platinum Nanoparticle Monolayers Deposited by the Langmuir−Blodgett Technique

Aleksandrovic, Vesna; Greshnykh, Denis; Randjelovic, Igor; Frömsdorf, Andreas; Kornowski, Andreas; Roth, Stephan V.; Klinke, Christian; Weller, Horst

doi:10.1021/nn800147a

Cited by 131 publications

(159 citation statements)

References 42 publications

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“…For the nanocrystals we chose a cobalt-platinum synthesis under Schlenk conditions which was published by Shevchenko et al [43] and applied in previous experiments [38,41,42]. It produces monodisperse nanocrystals with high chemical stability.…”

Section: Resultsmentioning

confidence: 99%

Metal nanoparticle field-effect transistor

Cai

Michels

Bachmann

et al. 2013

Journal of Applied Physics

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We demonstrate that by means of a local top-gate current oscillations can be observed in extended, monolayered films assembled from monodisperse metal nanocrystals -realizing transistor function. The oscillations in this metal-based system are due to the occurrence of a Coulomb energy gap in the nanocrystals which is tunable via the nanocrystal size. The nanocrystal assembly by the Langmuir-Blodgett method yields homogeneous monolayered films over vast areas. The dielectric oxide layer protects the metal nanocrystal field-effect transistors from oxidation and leads to stable function for months. The transistor function can be reached due to the high monodispersity of the nanocrystals and the high super-crystallinity of the assembled films. Due to the fact that the film consists of only one monolayer of nanocrystals and all nanocrystals are simultaneously in the state of Coulomb blockade the energy levels can be influenced efficiently (limited screening).

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Section: Resultsmentioning

confidence: 99%

Metal nanoparticle field-effect transistor

Cai

Michels

Bachmann

et al. 2013

Journal of Applied Physics

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“…Electrodes and contact pads were defined by electron-beam lithography, thermal evaporation of 2 nm Ti as adhesion layer and 23 nm Au and a final lift-off step. Each of the four synthesized particle types, pure CdSe NPs and the different Pt-decorated ones, were assembled to monolayers by the Langmuir-Blodgett technique using diethylene glycol as sub-phase 30 and finally deposited on top of the Au electrodes as monolayers as shown in Figure 3a and b (for TEM images see Supporting Information). 6 …”

Section: Hybrid Nanoparticle Monolayer Device Preparationmentioning

confidence: 99%

“…The electrode substrates were bathed in ethanol, isopropanol and demineralised water prior to use. After drying, they were mounted onto the workshop made sample holder, as described in reference (30), inserted into the holder of the dipper, and dipped into the sub phase with an optimum deposition angle of 15° between DEG surface and substrate (105° between substrate and sample holder). Several drops of the priory purified NP dispersion were spread out onto the 15 Langmuir-Blodgett sub phase with a microliter glass syringe.…”

Section: Monolayer Depositionmentioning

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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“…In this issue, several articles and features touch on this topic from different points of view. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] In our Conversation, Prof. Ned Seeman discusses structural DNA nanotechnology, a field that he has developed by working out the associations between strands of DNA, exploiting some naturally occurring features and inventing related others. 1 You will see how the creative process outstripped our ability to measure these structures and has led to long incubation times and much frustration along the way.…”

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“…As shown in the work of Prof. Horst Weller and his group, 5 Prof. Seeman, 1 and others in this field, the details of the assembly process have critical impact on the resulting structures and properties. Thus, comparing targeted structures to reality, developing the tools that combine ultrahigh resolution and functional measurements, and your creativity are going to be the keys to this burgeoning field.…”

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Hierarchical Assembly

Weiss¹

2008

ACS Nano

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A mong the most promising yet challenging aspects of nanoscience is the hierarchical assembly of materials. Nature has given us many elegant examples of how this can be done and has shown us the extraordinary results of accomplishing this feat. We are just now decoding snippets of how such biological systems come together and function and co-opting some of these to create what are, by comparison, still primitive assemblies. At the same time, we are developing new methods of and strategies for assembly and are trying to determine the associated rules and scales. This is no simple task, as even measuring the assembled systems is at or beyond the limits of our current abilities.A hallmark of work in this area has been the creativity of those involved, and one has the sense that we are exploring largely uncharted territory. Rarely are we able to get atomic-scale views of the results, which would serve as the best guide to further advances. Instead, we get lower resolution glimpses with available methods or see the results of our work less directly. In this issue, several articles and features touch on this topic from different points of view. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] In our Conversation, Prof. Ned Seeman discusses structural DNA nanotechnology, a field that he has developed by working out the associations between strands of DNA, exploiting some naturally occurring features and inventing related others. 1 You will see how the creative process outstripped our ability to measure these structures and has led to long incubation times and much frustration along the way. The measurements of these systems have become more direct over time, moving from gel electrophoresis, to Fö rster resonance energy transfer (FRET, an optical technique that measures proximity at the few nanometers scale), to atomic force microscopy at present; this has both accelerated the advances and enabled increasing complexity of the DNA and hybrid structures assembled. Prof. Seeman points us toward the next steps in this field as well as new enabling capabilities to come.Such efforts have advanced sufficiently that features and properties can now be designed into these assemblies. Prof. Seeman describes a number of such advances. Also in this issue, Prof. Jørgen Kjems and co-workers have furthered the design tools for and elements of DNA origami (Figure 1), originally developed by Dr. Paul Rothemund. 2,15 Prof. Dmitri Talapin explores competing interaction strengths and driving forces for hierarchical assembly in his Perspective. 3 He points out how these strengths scale differently for nanoparticles than they do for atoms and molecules. The result is that our intuition fails us, and we have to reconsider the interplay between these driving forces for hierarchical assembly. Often, the strengths are sufficiently close that we have not developed a predictive capability. Thus, systematic studies, such as those reported by Chen and O'Brien on binary nanoparticle superlattices, 4 or by Weller and co-workers on the preparation of hig...

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Preparation and Electrical Properties of Cobalt−Platinum Nanoparticle Monolayers Deposited by the Langmuir−Blodgett Technique

Cited by 131 publications

References 42 publications

Metal nanoparticle field-effect transistor

Metal nanoparticle field-effect transistor

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

Hierarchical Assembly

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