Surface electrical resistivity and wettability study of fused silica

Senn, B. C.; Pigram, Paul J.; Liesegang, J.

doi:10.1002/(sici)1096-9918(199909)27:9<835::aid-sia642>3.0.co;2-t

Cited by 13 publications

(8 citation statements)

References 27 publications

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“…[23][24][25] It was shown that protons can be produced electrolytically from water on the SiO 2 surface by replacing water in the ambient by heavy water ͑D 2 O͒ and detecting deuterium gas ͑D 2 ͒ after performing surfaceconductivity measurements. 23 Therefore, we suggest that in the above experiments protons are responsible for the time evolution of the potential profiles.…”

Section: Proton Migration Mechanism For the Bias-stress Effectmentioning

confidence: 99%

Proton migration mechanism for operational instabilities in organic field-effect transistors

et al. 2010

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. (2010). Proton migration mechanism for operational instabilities in organic field-effect transistors. Physical Review B, 82(7), 075322-1/11. [075322]. DOI: 10.1103/PhysRevB.82.075322 DOI:10.1103/PhysRevB.82.075322 Document status and date:Published: 01/01/2010 Document Version:Publisher's PDF, also known as Version of Record (includes final page, issue and volume numbers) Please check the document version of this publication:• A submitted manuscript is the version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal.If the publication is distributed under the terms of Article 25fa of the Dutch Copyright Act, indicated by the "Taverne" license above, please follow below link for the End User Agreement: Organic field-effect transistors exhibit operational instabilities involving a shift of the threshold gate voltage when a gate bias is applied. For a constant gate bias the threshold voltage shifts toward the applied gate bias voltage, an effect known as the bias-stress effect. Here, we report on a detailed experimental and theoretical study of operational instabilities in p-type transistors with silicon-dioxide gate dielectric both for a constant as well as for a dynamic gate bias. We associate the instabilities with a reversible reaction in the organic semiconductor in which holes are converted into protons in the presence of water and a reversible migration of these protons into the gate dielectric. We show how redistribution of charge between holes in the semiconductor and protons in the gate dielectric can consistently explain the experimental observations. Furthermore, we show how a shorter period of application of a gate bias leads to a faster backward shift of the threshold voltage when the gate bias is removed. The proposed mechanism is consistent with the observed acceleration of the bias-stress effect with increasing humidity, increasing temperature, and increasing energy of the highest molecular orbital of the org...

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Section: Proton Migration Mechanism For the Bias-stress Effectmentioning

confidence: 99%

Proton migration mechanism for operational instabilities in organic field-effect transistors

et al. 2010

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“…It is considered to be caused by the inverted surface charge of the PLL coating. The surface of quartz nanopipettes is negatively charged because of the partial dissociation of the surface silanol groups in pH-neutral solution, 18 whereas the PLL layer makes this surface neutralized and further positively charged because of the protonated primary amine groups of the lysine residues. The contribution of surface charge can be experimentally confirmed by changing the solution pH.…”

Section: Contribution Of Surface Charge To the Observed Current Rectimentioning

confidence: 99%

Current Rectification with Poly-l-Lysine-Coated Quartz Nanopipettes

et al. 2006

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Ion current rectification with quartz nanopipette electrodes was investigated through the control of the surface charge. The presence and absence of a positively charged poly-L-lysine (PLL) coating resulted in the rectified current with opposite polarity. The results agreed with the theories developed for current-rectifying conical nanopores, suggesting the similar underlying mechanism among asymmetric nanostructure in general. This surface condition dependence can be used as the fundamental principle of multi-purpose real-time in vivo biosensors. Nanomaterials are being widely exploited by recent technologies because of their extraordinary properties. Although the development of fabrication processes for particular nanostructures poses great challenges by itself, the practical use of these nanomaterials is also of great interest for biology and medicine. 1 Because of their structural diversity, these materials are often categorized and referred to as nanoparticles, 2 nanowires, 3 nanotubes, 4 nanopores, 5 or nanopatterned surfaces. 6 Nanopipettes are among these; a nanopipette is defined as a pipette with a very fine tip that has a nanoscale opening. Nanolithography is one of the typical applications of nanopipettes as a delivery tool of a tiny amount of chemicals. 7,8 Nanopipettes are versatile enough to be used as a tool for sensitive detection in biomedical applications. Optical detection of fluorescently labeled macromolecules such as DNA or proteins with nanopipettes has been reported. 9,10 Fully electrical detection has also been shown with similarly sized nanoparticles, whose flow through the nanopipette opening creates temporal current blockades. 11 The ultimate goal of these efforts, the label-free real-time electrical detection of single molecules, could be achieved eventually by a deeper understanding of the fundamental characteristics of nanopipette electrodes under an external electric field. It not only helps to unveil the dynamics of biological systems but can also have a remarkable impact on drug screening and pathogen detection. Interestingly, although a general understanding of nanopipette electrodes can be based on the understanding of microelectrodes, the unique nanoscale geometry often causes characteristic behavior that requires further focused studies. For example, related studies have examined the physicochemical properties of nanopipettes under varying conditions such as electrolyte concentrations and pH, 12 or polyethylene glycol polymer coatings. 13 Similarly shaped goldplated conical nanopores have been studied in a more detailed manner, involving observations of the role of surface charge in the ionic current. 14 Our target here is the effect of cationic polymer coating on a glass nanopipette surface, providing the basis for functionalized nanopipettes that will be used as sensitive biosensors. By understanding how ions flow through the nanometer-sized opening, how these ions interact with the surface inside and outside the tip, and what happens if the surface is modified by...

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“…Herein, we propose an innovative design strategy, where non‐conductive, carbon‐free SiO 2 (≈6.25 × 10 −15 S cm −1 ) [ 47 ] serves as a host for sulfur. This is unlike current state‐of‐the‐art LSB designs, where highly conductive carbon (0.01–20 S cm −1 at 20 °C) [ 48 ] is exclusively used as a host.…”

Section: Introductionmentioning

confidence: 99%

Revisiting the Role of Conductivity and Polarity of Host Materials for Long‐Life Lithium–Sulfur Battery

Lee

Kang

Hayoung

et al. 2020

Advanced Energy Materials

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Despite their high theoretical energy density and low cost, lithium–sulfur batteries (LSBs) suffer from poor cycle life and low energy efficiency owing to the polysulfides shuttle and the electronic insulating nature of sulfur. Conductivity and polarity are two critical parameters for the search of optimal sulfur host materials. However, their role in immobilizing polysulfides and enhancing redox kinetics for long‐life LSBs are not fully understood. This work has conducted an evaluation on the role of polarity over conductivity by using a polar but nonconductive platelet ordered mesoporous silica (pOMS) and its replica platelet ordered mesoporous carbon (pOMC), which is conductive but nonpolar. It is found that the polar pOMS/S cathode with a sulfur mass fraction of 80 wt% demonstrates outstanding long‐term cycle stability for 2000 cycles even at a high current density of 2C. Furthermore, the pOMS/S cathode with a high sulfur loading of 6.5 mg cm−2 illustrates high areal and volumetric capacities with high capacity retention. Complementary physical and electrochemical probes clearly show that surface polarity and structure are more dominant factors for sulfur utilization efficiency and long‐life, while the conductivity can be compensated by the conductive agent involved as a required electrode material during electrode preparation. The present findings shed new light on the design principles of sulfur hosts towards long‐life and highly efficient LSBs.

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Surface electrical resistivity and wettability study of fused silica

Cited by 13 publications

References 27 publications

Proton migration mechanism for operational instabilities in organic field-effect transistors

Proton migration mechanism for operational instabilities in organic field-effect transistors

Current Rectification with Poly-l-Lysine-Coated Quartz Nanopipettes

Revisiting the Role of Conductivity and Polarity of Host Materials for Long‐Life Lithium–Sulfur Battery

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