Quantification of in-contact probe-sample electrostatic forces with dynamic atomic force microscopy

Balke, Nina; Jesse, Stephen; Carmichael, Ben; Okatan, M. Baris; Kravchenko, Ivan I.; Kalinin, Sergei V.; Tselev, Alexander

doi:10.1088/1361-6528/aa5370

Cited by 47 publications

(42 citation statements)

References 76 publications

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“…In field emitter tips experiments, field strengths of 1–3 V/Å are recorded 28 – 30 and it has been proven that intensities of 0.30 V/Å are necessary in order to induce water dissociation 16 – 18 and, in general, to significantly shift the bonding electrons 14 , thus confirming the predictions by some of us 15 , achieved with a very similar computational approach. Very recently, fields within this order of magnitude have been again experimentally detected at the tip proximity 31 . All these evidences strongly suggest the experimental feasibility of the proposed reactions, by exploiting the high field capability of, e .…”

Section: Resultsmentioning

confidence: 88%

Novel electrochemical route to cleaner fuel dimethyl ether

Cassone

Pietrucci

Saija

et al. 2017

Sci Rep

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Methanol, the simplest alcohol, and dimethyl ether, the simplest ether, are central compounds in the search for alternative “green” combustion fuels. In fact, they are generally considered as the cornerstones of the envisaged “Methanol Economy” scenario, as they are able to efficiently produce energy in an environmentally friendly manner. However, despite a massive amount of research in this field, the synthesis of dimethyl ether from liquid methanol has never so far been reported. Here we present a computational study, based on ab initio Molecular Dynamics, which suggests a novel synthesis route to methanol dehydration – leading thus to the dimethyl ether synthesis – through the application of strong electric fields. Besides proving the impressive catalytic effects afforded by the field, our calculations indicate that the obtained dimethyl ether is stable and that it can be progressively accumulated thanks to the peculiar chemical pathways characterising the methanol reaction network under electric field. These results suggest that the experimental synthesis of dimethyl ether from liquid methanol could be achieved, possibly in the proximity of field emitter tips.

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Section: Resultsmentioning

confidence: 88%

Novel electrochemical route to cleaner fuel dimethyl ether

Cassone

Pietrucci

Saija

et al. 2017

Sci Rep

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“…Poglitsch and Weber suggested that the low temperature orthorhombic state of MAPbI 3 has the Pn2a 1 symmetry and can be ferroelectric, [22] but later refinement of the structure showed that the correct point group is cen trosymmetric Pnma [28] which can only be antipolar. [66] The other report [32] was not cleared by referees yet and to us contains many inconsistencies and no clear evidence for fer roelectricity. In the one case [31] ferroelastic domains (as shown in ref.…”

Section: Order and Disordermentioning

confidence: 90%

“…In the one case ferroelastic domains (as shown in ref. ) were interpreted as ferroelectric domains which is likely due to an incomplete interpretation of the response of the atomic force microscopy (AFM) cantilever to electric excitation of the material . The other report was not cleared by referees yet and to us contains many inconsistencies and no clear evidence for ferroelectricity.…”

Section: Order and Disordermentioning

confidence: 99%

Dielectric Response: Answer to Many Questions in the Methylammonium Lead Halide Solar Cell Absorbers

Anusca

Balčiu̅nas

Gemeiner

et al. 2017

Advanced Energy Materials

190

271

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Due to the unprecedented rapid increase of their power conversion efficiency, hybrid organic-inorganic perovskites CH 3 NH 3 PbX 3 (X = I, Br, Cl) can potentially revolutionize the world of solar cells. However, despite tremendous research activity, the origin of the exceptionally large diffusion length of their photogenerated charge carriers, that is, their low recombination rate, remains elusive. Using frequency and temperature-dependent dielectric measurements across the entire frequency spectrum, it is shown that the dielectric constant conserves very high values (>27) for frequencies below 1 THz in all three halides. This efficiently prevents photocarrier trapping and their recombination owing to the strong screening of charged entities. By combining ultrasonic and Raman spectroscopy with dielectric analysis, similarly large contributions to the dielectric constant are attributed to the dipolar disorder of the CH 3 NH 3 + cations as well as lattice dynamics in the gigahertz range yielding dielectric constants of ε stat = 62 for the iodide, 58 for the bromide, and about 45 for the chloride below 1 GHz at room temperature. Disorder continuously reduces for decreasing temperature. Dipole dynamics prevail in the intermediate tetragonal phase. The low-temperature orthorhombic state is antipolar. No indications of ferroelectricity are found.

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“…In particular, nowadays is very well-established by a plethora of experimental, theoretical, and computational works that very intense (i.e., in the order of 0.1 − 1.0 V/Å) electric fields rule the microscopic behavior of matter. In addition, many laboratories have become capable to probe and hence quantify the high reactivity-enhancing properties of intense field strengths generated in proximity of emitter tips 25,27,28 . As an example, the experiment that reported the electrostatic catalysis of a Diels-Alder reaction demonstrated that the typical electric field strengths necessary for such a catalysis are in the order of 0.1 V/Å 25 .…”

Section: Introductionmentioning

confidence: 99%

Catalyst-Free Hydrogen Synthesis from Liquid Ethanol: An ab Initio Molecular Dynamics Study

et al. 2019

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Hydrogen is the simplest, oldest, and most widespread molecule in Nature. Nevertheless, the vast majority of the hydrogen industrial production stems from steam reforming of methane performed at high temperatures or pressures. Albeit other chemical routes to the hydrogen synthesis-involving, e.g., water electrolysis and novel photocatalysts-have recently been explored, no catalyst-free reaction pathways have been identified, seriously limiting the large-scale deployment of hydrogen. Based on state-of-the-art ab initio molecular dynamics simulations, here we present a study revealing a novel synthesis route to hydrogen from neat liquid ethanol, which has been achieved at room temperature and in absence of any catalyst, upon electric field exposure. This result paves the way to the unprecedented catalyst-free experimental synthesis of hydrogen from liquid ethanol by exploiting commonly employed field emitter tips apparatus. 2

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Quantification of in-contact probe-sample electrostatic forces with dynamic atomic force microscopy

Cited by 47 publications

References 76 publications

Novel electrochemical route to cleaner fuel dimethyl ether

Novel electrochemical route to cleaner fuel dimethyl ether

Dielectric Response: Answer to Many Questions in the Methylammonium Lead Halide Solar Cell Absorbers

Catalyst-Free Hydrogen Synthesis from Liquid Ethanol: An ab Initio Molecular Dynamics Study

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