Size-controlled fabrication of gold nanodome arrays and its application to enzyme electrodes

Ikegami, Masiki; Mie, Yasuhiro; Hirano, Yu; Suzuki, Masaaki; Komatsu, Yasuo

doi:10.1016/j.colsurfa.2011.04.024

Cited by 14 publications

(5 citation statements)

References 24 publications

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“…roughness R q , and dome height h) varied depending on the anodization voltage applied during the preparation process. In line with previous reports, 35,36 and as seen in the line profile insets in Figure 1, the domes had a prolate spheroid shape, whose diameter φ varied from 23 to 230 nm, and a height h calculated using topographic line profiles ranging from 1.8 to 32 nm. Detailed sample characteristics can be found in Table S1 (Supporting Information).…”

Section: Resultssupporting

confidence: 92%

Sustained Frictional Instabilities on Nanodomed Surfaces: Stick–Slip Amplitude Coefficient

et al. 2013

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Understanding the frictional properties of nanostructured surfaces is important due to their increasing application in modern miniaturised devices. In this work, lateral force microscopy was used to study the frictional properties between an AFM nanotip and surfaces bearing well-de ned nanodomes comprising densely packed prolate spheroids, of diameters ranging from tens to hundreds of nanometres. Our results show that the average lateral force varied linearly with applied load, as described by Amontons' rst law of friction, although no direct correlation between the sample topographic * To whom correspondence should be addressed † 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 properties and their measured friction coe cients was identi ed. Furthermore, all the nanodomed textures exhibited pronounced oscillations in the shear traces, similar to the classic stick-slip behaviour, under all the shear velocities and load regimes studied. School of Chemistry, University of BristolThat is, the nanotextured topography led to sustained frictional instabilities, e ectively with no contact frictional sliding. The amplitude of the stick-slip oscillations, σ f , was found to correlate with the topographic properties of the surfaces, and scale linearly with the applied load. In line with the friction coe cient, we de ne the slope of this linear plot as the stick-slip amplitude coe cient (SSAC ). We suggest that such stick-slip behaviours are characteristics of surfaces with nanotextures, and that such local frictional instabilities have important implications to surface damage and wear.We thus propose that the shear characteristics of the nanodomed surfaces can not be fully described by the framework of Amontons' laws of friction, and that additional parameters (e.g. σ f and SSAC) are required, when their friction, lubrication and wear properties are important considerations in related nanodevices.

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Section: Resultssupporting

confidence: 92%

Sustained Frictional Instabilities on Nanodomed Surfaces: Stick–Slip Amplitude Coefficient

et al. 2013

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“…Technologies involving small, sharp gold nanocones are currently of great interest due to their diverse practical applications-ranging from biosensing [2], catalytic surfaces [13], and drug delivery [29] to antireflective coatings [18], surface-enhanced Raman spectroscopy [15], and near-field scanning optical microscopies [10]. The ability to fabricate these structures with precise and accurate dimensions is paramount for the development and amelioration of many of these applications.…”

Section: Introductionmentioning

confidence: 99%

Precise tailoring of evaporated gold nanocones using electron beam lithography and lift-off

et al. 2020

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The ability to fabricate nanocones having precise dimensions is essential for several emerging applications. We demonstrate here a method which can be used to fabricate arrays of gold nanocones with high dimensional precision using lithographic and lift-off means. Electron beam (ebeam) writing of a spin-coated PMMA-based bilayer resist deposited onto silicon wafers is used to form a shadow mask. This mask gradually closes as the deposition of gold (using ebeam evaporation) proceeds-the result is arrays of gold nanocones on the silicon wafer surface after lift-off of the resist. Observations using scanning electron microscopy (SEM) enable a statistical study of the dimensions of 360 gold nanocones-the results demonstrate a high precision of the nanocones dimensions. The fabrication process enables the creation of arrays of nanocones having a base diameter varying from 53.6±2.1 nm to 94.1±2.4 nm, a vertical height ranging from 71.3±4.1 nm to 153.4±3.4 nm, and an apex radius of curvature of ranging from 8.4±1.2 nm to 11.6±1.5 nm. The results are compared with the predictions of a deposition model which considers the evolving shadow masking during the gold deposition to compute the nanocone profile.

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“…Therefore, various electrode materials (carbon [7][8][9], gold [10], metal oxide [11,12], etc. ), electrode structures (nanocomposites [8,13,14], carbon nanofiber [15], etc.)…”

Section: Introductionmentioning

confidence: 99%

Electrochemical microfluidic devices for evaluation of drug metabolism

Shiba

Yoshioka

Kato

et al. 2016

Journal of Electroanalytical Chemistry

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An electrochemical drug metabolizing sensor device was fabricated with a patterned electrode of polycrystalline indium tin oxide (pITO) film and a poly(dimethylsiloxane) (PDMS) thin layer microchannel. The pITO film is known to be suitable as an electrode for detecting direct electron transfer (DET) from cytochrome P450 (CYP) without any surface modification. However, the ITO surface is hydrophilic and this causes the CYP to detach from it, resulting in poor repeatability. This manuscript describes the simultaneous electrochemical measurement of drug metabolizing reactions that is achieved by continuously supplying the pITO electrode surface with a small amount of microsome CYP. To achieve this, the microchannel was evaluated for its flow uniformity and reproducibility, and the shape and dimensions needed for good performance were determined by using a highly uniform nickel mold obtained by employing a polishing process after electroplated mold fabrication. A clearly separated dual flow was established with the microchannel. Using dual pITO working electrodes arranged in parallel (dual flow measurement) and subtraction process, the current from only the drug metabolism reaction was obtained by introducing drugs and microsome CYP at one pITO electrode and introducing only microsome CYP at the other pITO electrode. We also performed a kinetic analysis of the CYP activity in our electrochemical microfluidic device.

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Size-controlled fabrication of gold nanodome arrays and its application to enzyme electrodes

Cited by 14 publications

References 24 publications

Sustained Frictional Instabilities on Nanodomed Surfaces: Stick–Slip Amplitude Coefficient

Sustained Frictional Instabilities on Nanodomed Surfaces: Stick–Slip Amplitude Coefficient

Precise tailoring of evaporated gold nanocones using electron beam lithography and lift-off

Electrochemical microfluidic devices for evaluation of drug metabolism

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