Nanoscale electrical properties of cluster-assembled palladium oxide thin films

Cassina, Valeria; Gerosa, Lorenzo; Podestà, Alessandro; Ferrari, Giorgio; Sampietro, Marco; Fiorentini, F.; Mazza, Tommaso; Lenardi, Cristina; Milani, P.

doi:10.1103/physrevb.79.115422

Cited by 15 publications

(12 citation statements)

References 32 publications

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“…We have used the conductive AFM tip as one of the two electrode of a nanoscale capacitor, the other being the conductive n + doped silicon substrate; the thin IL layer plays the role of the dielectric slab in between the capacitor plates. This is the standard configuration of AFM-based nanoscale impedance and electrostatic force spectroscopy, [78][79][80][81][82] ( r = 3.9) or NaCl ( r = 5.3). Since a similar difference between the values of the dielectric constant obtained by the two approaches is observed also in the case of the test measurements carried out on thermal SiO 2 films (see the Supporting Information, Section S6), we attribute this discrepancy to a systematic error in the fit introduced by the subtraction of a strong interference pattern in the electrostatic force curves (additional information can be found in Supporting Information Figure S8, S9).…”

Section: Dielectric Behavior Of Solid-like [Bmim][ntf2] Layersmentioning

confidence: 99%

Surface confinement induces the formation of solid-like insulating ionic liquid nanostructures

Bovio¹,

Milani²,

Podestà

2017

Preprint

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We report on the modification of the electric properties of the imidazolium-based [BMIM][NTf2] ionic liquid upon surface confinement in the sub-monolayer regime. Solid-like insulating nanostructures of [BMIM][NTf2] spontaneously form on a variety of insulating substrates, at odd with the liquid and conductive nature of the same substances in the bulk phase. A systematic spatially resolved investigation by atomic force microscopy of the morphological, mechanical and electrical properties of [BMIM][NTf2] nanostructures showed that this liquid substance rearranges into lamellar nanostructures with a high degree of vertical order and enhanced resistance to mechanical compressive stresses and very intense electric fields, denoting a solid-like character. The morphological and structural reorganization has a profound impact on the electric properties of supported [BMIM][NTf2] islands, which behave like insulator layers with a relative dielectric constant between 3 and 5, comparable to those of conventional ionic solids, and significantly smaller than those measured in the bulk ionic liquid. These results suggest that in the solid-like ordered domains confined either at surfaces or inside the pores of the nanoporous electrodes of photo-electrochemical devices, the ionic mobility and the overall electrical properties can be significantly perturbed with respect to the bulk liquid phase, which would likely influence the<br>performance of the devices.<br>

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Section: Dielectric Behavior Of Solid-like [Bmim][ntf2] Layersmentioning

confidence: 99%

Surface confinement induces the formation of solid-like insulating ionic liquid nanostructures

Bovio¹,

Milani²,

Podestà

2017

Preprint

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“…Given that the topographic features of the substrate play an essential role, the morphology of the cluster assembled ns‐TiO x may favor the interaction of cells with its surface . Therefore, it is of extreme interest to quantitatively characterize the interaction of this new material with proteins, as this is the basis for controlling cell–surface interactions .…”

Section: Supersonic Cluster Beam Depositionmentioning

confidence: 99%

“…Comparing the performances of the coating with those of the most common commercial substrates in protein and antibody microarray assays, this method demonstrated equivalent efficiency. Through a robust statistical evaluation of repeatability in terms of coefficient of variation analysis, they demonstrate that ns‐TiO x can be used as a reliable substrate for biochips in analytical protein microarray application …”

Section: Supersonic Cluster Beam Depositionmentioning

confidence: 99%

“…Given that the topographic features of the substrate play an essential role, the morphology of the cluster assembled ns-TiOx may favor the interaction of cells with its surface. 48 Therefore, it is of extreme interest to quantitatively characterize the interaction of this new material with proteins, as this is the basis for controlling cell-surface interactions. 67 Considering our recent study on nanostructured zirconium oxide, to the best of our knowledge, bottom-up approach of zirconia film synthesis in form of nanoclusters, using PMCS technique is truly novel with defined nanoscale physical and chemical properties.…”

Section: Pmcs-scbd As An Innovative Tool To Produce Ns-tio 2 Filmsmentioning

confidence: 99%

“…Through a robust statistical evaluation of repeatability in terms of coefficient of variation analysis, they demonstrate that ns-TiOx can be used as a reliable substrate for biochips in analytical protein microarray application. 48 Immunocell arrays technology based on antibodynanostructured surface interaction. The knowledge of signaling pathways, which are triggered by physiological and pathological conditions or drug treatment, is essential for the comprehension of the biological events that regulate cellular responses.…”

Section: Pmcs-scbd As An Innovative Tool To Produce Ns-tio 2 Filmsmentioning

confidence: 99%

See 2 more Smart Citations

Biotechnological applications of supersonic cluster beam‐deposited nanostructured thin films: Bottom‐up engineering to optimize cell–protein–surface interactions

Singh

2013

J Biomedical Materials Res

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Technological innovations in biomaterial sciences harness nanoparticle (NP) production, manipulation, and deposition with supreme precision, enabling the development of industrial processes. This review first discusses the basic components of this approach, introducing cluster sources, experimental apparatus, and growth mechanisms for NP formation. The second part of this review provides an overview of how the nanoscale bottom-up engineering can control protein adsorption, which in turn determines the fate of nanostructured coating for prokaryotic and mammalian (primary and stem) cell interactions. In addition, we briefly address the implications of the cluster beam deposition technique for nanostructuration of biocompatible microdevices and its potential as a facile coating method to promote protein-surface interactions for microarray applications in biotechnology.

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Effect of Parasitic Capacitance on Impedance Measurement and Model Extraction

Zhang

Zhu

2010

Electroanalysis

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Impedance spectroscopy has been widely used for the characterization of materials and structures. An impedance model can be employed to extract electrical parameters ascribed to the electrical properties of material interiors, boundaries, and external material/electrode interfaces. In an impedance model, a parasitic capacitance exerts an important effect, and is thus an essential to be added. In this paper, dramatic impact of parasitics on impedance spectra and parameter extraction is investigated using theoretical analyses, simulations, and physical experiments. A complex nonlinear least squares fitting method based on a parasitic model together with an I-V assisted estimation method is proposed for providing more accurate and efficient parameter extraction than previously available solutions. The results also reveal that the low frequency band (below 1 kHz) is not recommended to be used because the impedance measurements are influenced badly by noise. The moderate frequency band (1 kHz -1 MHz) is a recommended range for parameter extraction.

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Nanoscale electrical properties of cluster-assembled palladium oxide thin films

Cited by 15 publications

References 32 publications

Surface confinement induces the formation of solid-like insulating ionic liquid nanostructures

Surface confinement induces the formation of solid-like insulating ionic liquid nanostructures

Biotechnological applications of supersonic cluster beam‐deposited nanostructured thin films: Bottom‐up engineering to optimize cell–protein–surface interactions

Effect of Parasitic Capacitance on Impedance Measurement and Model Extraction

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