1,720,963 research outputs found
Junction design strategies in molecular electronics
Get PDFThe field of molecular electronics ultimately aims to develop electronic devices using single molecules as building blocks. To achieve this goal, a thorough understanding of the structure-property relationships in molecular architectures is crucial. The past few decades have seen an explosive number of studies in this emerging field, establishing a solid foundation for electronic interactions at the nanoscale. Despite this progress, the route to genuinely stable and reproducible devices still faces many challenges. This work contributes to tackling some of these challenges by studying the effects of manipulating components of a nanoscale junction on its electronic transport properties. Scanning tunnelling microscopy techniques are employed to fabricate junctions and measure the current through them.
Firstly, the influence of junction design on electron transport is studied by inserting platinum or ruthenium metal atoms in the molecular bridge. These organometallic wires generally have a higher conductance than their organic counterparts due to a smaller gap between highest occupied and lowest unoccupied molecular orbitals. However, in the thioether induced midgap wires studied here, only the ruthenium wires show an increased conductance. This is a result of a stronger coupling between molecule and metal, and a better distribution of orbitals along the entire junction, which is not the case for the platinum wires.
In the second part, one of the two metal electrodes is replaced by transparent indium tin oxide for future optoelectronic studies and applications. New anchoring groups for binding to this semiconductor electrode are designed and show promising results, including one group that only binds to this indium tin oxide electrode. Moderate rectification is also observed for these metal-molecule-semiconductor junctions.
In the third and last part, three junction designs for studying complex effects in molecular structures are discussed. The first is a three-dimensional metal complex, designed to study supramolecular lateral effects, where the metal does not seem to participate in the transport pathway. The second contains a metallic anchoring group, which does not seem to be suitable for forming junctions using the dynamic scanning tunnelling microscopy break-junction technique. Finally, a molecular wire that is designed for optical switching shows a curious inverse correlation of conductance with applied bias voltage. The results presented here confirm yet again that there is a complex interplay between several key parameters, which together dictate the electrical behaviour of nanoscale junctions
Single-Molecule Conductance Data for a set of organometallic "molecular bundles"
No full textAs in title. Entry contains both raw data acquired and custom software used for its processing to ASCII tables, which can then be analysed and plotted using any graphing software
Transport and thermoelectric properties of ‘wire-like’ organometallic complexes
Get PDFCollection of data corresponding to the conductance measurements for the molecules included in the paper: "Transport and thermoelectric properties of ‘wire-like’ organometallic complexes". You can find in the files the current and the distance which have been used in the measurements. Using Originlab, excel or any other software a scientist working in the field of molecular electronics an reproduce the figures and values showed in the paper
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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