Nanocoaxes for optical and electronic devices

Rizal, Binod; Merlo, Juan M.; Burns, Michael J.; Chiles, Thomas C.; Naughton, Michael

doi:10.1039/c4an01447b

Cited by 15 publications

(20 citation statements)

References 117 publications

(220 reference statements)

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“…A seemingly different approach to dealing with the tissue response problem may be to reduce physical dimensions of the device. Interestingly, the evolution of electronics can be characterized, at least in part, with the reduction in feature size of components and devices within integrated circuits (36), and the future progress of neurotechnology may also follow this path. While for electronics, "thinking small" results in improvements in circuit speed and efficiency, for implantable neural interfaces, the result may be a device that can evade the FBR.…”

Section: Introductionmentioning

confidence: 99%

Thinking Small: Progress on Microscale Neurostimulation Technology

Pancrazio

Deku

Ghazavi

et al. 2017

Neuromodulation: Technology at the Neural Interface

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Objectives Neural stimulation is well-accepted as an effective therapy for a wide range of neurological disorders. While the scale of clinical devices is relatively large, translational and pilot clinical applications are underway for microelectrode-based systems. Microelectrodes have the advantage of stimulating a relatively small tissue volume which may improve selectivity of therapeutic stimuli. Current microelectrode technology is associated with chronic tissue response which limits utility of these devices for neural recording and stimulation. One approach for addressing the tissue response problem may be to reduce physical dimensions of the device. “Thinking small” is a trend for the electronics industry, and for implantable neural interfaces, the result may be a device that can evade the foreign body response. Materials and Methods This review paper surveys our current understanding pertaining to the relationship between implant size and tissue response and the state-of-the-art in ultra-small microelectrodes. A comprehensive literature search was performed using PubMed, Web of Science (Clarivate Analytics), and Google Scholar. Results The literature review shows recent efforts to create microelectrodes that are extremely thin appear to reduce or even eliminate the chronic tissue response. With high charge capacity coatings, ultra-microelectrodes fabricated from emerging polymers and amorphous silicon carbide appear promising for neurostimulation applications. Conclusion We envision the emergence of robust and manufacturable ultra-microelectrodes that leverage advanced materials where the small cross-sectional geometry enables compliance within tissue. Nevertheless, future testing under in vivo conditions is particularly important for assessing the stability of thin film devices under chronic stimulation.

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Section: Introductionmentioning

confidence: 99%

Thinking Small: Progress on Microscale Neurostimulation Technology

Pancrazio

Deku

Ghazavi

et al. 2017

Neuromodulation: Technology at the Neural Interface

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“…Silicon oxide nanowires can be coated with various materials, including metals and semiconductors. In this case, they serve as templates for the formation of core‐shell nanowires or nanocoax structures . Such nanostructures find application in lithium‐ion batteries and solar cells, for catalysis, etc.…”

Section: Introductionmentioning

confidence: 99%

Influence of substrate temperature on the morphology of silicon oxide nanowires synthesized using a tin catalyst

Khmel

Баранов

Zamchiy

et al. 2016

Physica Status Solidi (a)

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Silicon oxide nanowires SiOx were synthesized by the gas‐jet electron beam plasma chemical vapor deposition method. The synthesis of nanostructures was carried out on silicon substrates with thin tin film as a catalyst. The evolution in the morphology of the obtained structures was investigated while changing the substrate temperature in the range 200–415 °C. Dense array of aligned nanowire bundles (microropes) is formed at a temperatures of 335 and 415 °C. With decrease in the temperature to 270 and 245 °C arrays of microropes transform into cocoon‐like structures of nanowires. At a temperature 200 °С, array formed almost entirely consisting of cocoon‐like structures. The results of X‐ray energy dispersive spectroscopy (EDS) of the nanowires show that the ratio of oxygen to silicon is on average Si:O = 1:2.4. At the same time, Fourier Transform Infrared spectroscopy (FTIR) analysis of the obtained nanostructures showed that the synthesized nanowires consist of SiOx with x around 2. Moreover, the composition of the structures remains practically unchanged with the variation of the substrate temperature. The IR spectra show bands due to both Si–OH bonds and water molecules. Measurements of contact angles for water showed that the nanowire film surface synthesized in this work is hydrophilic in nature. When structuring involves the oriented growth microropes, the contact angle is about 20–35°. Decreasing of the substrate temperature and formation of cocoon‐like structures leads to a decrease in the contact angle to 4–12°. The photoluminescence (PL) spectra of nanostructures synthesized at the different substrate temperatures consist of a broad band with a maximum around 2.5 eV when using laser at 325 nm as the exciting source. We assume that the composition of the nanowires is close to SiO2, and the excess of oxygen in structures composition is due to the influence of adsorbed water molecules and hydroxyl groups with the formation of Si–OH bonds. Apparently, these bonds define the photoluminescence spectrum.

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“…One‐dimensional nanostructures, such as nanowires, are of interest for both basic research and practical applications, due to their unique properties . In particular, extensive research has been conducted on the use of nanowires to produce solar cells (SCs) of the third generation.…”

Section: Introductionmentioning

confidence: 99%

“…Nanowires of other materials, such as zinc oxide or copper oxide, can also be used for this purpose . In this article, we propose to use nanowires of silicon oxide SiO x ( x ≤ 2).…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of silicon oxide nanowires by the GJ EBP CVD method using different diluent gases

Khmel

Баранов

Зайковский

et al. 2016

Physica Status Solidi (a)

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Nanowires of silicon oxide SiOx (x ≤ 2) were synthesized from a mixture of monosilane and hydrogen (helium, argon) by gas‐jet electron beam plasma chemical vapor deposition (GJ EBP CVD) method with simultaneous supply of oxygen into the vacuum chamber. The synthesis was performed on monocrystalline silicon and glass substrates coated with micron‐sized particles of a tin catalyst. In particular, aligned arrays of nanowire bundles (microropes) were synthesized from a mixture of monosilane and hydrogen (argon). A bundle of amorphous silicon oxide nanowires, each of which is about 15 nm in diameter, grows from a catalyst particle. The growth rate of the microropes is about 25 nm s−1 at a synthesis temperature of 320–330 °C. The morphology of the nanostructures was investigated by transmission and scanning electron microscopy, their composition by X‐ray energy dispersive spectroscopy and optical properties by photoluminescence spectroscopy. The synthesis was carried out using the well‐known vapor–liquid–solid (VLS) mechanism. A model is proposed for the synthesis of the nanostructures by the above method, including the formation of aligned bundles of nanowires (microropes) due to nonuniform heating of the catalyst particle by directed plasma flow. The obtained nanostructures have intense photoluminescence in the visible region of the spectrum at room temperature.

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Nanocoaxes for optical and electronic devices

Cited by 15 publications

References 117 publications

Thinking Small: Progress on Microscale Neurostimulation Technology

Thinking Small: Progress on Microscale Neurostimulation Technology

Influence of substrate temperature on the morphology of silicon oxide nanowires synthesized using a tin catalyst

Synthesis of silicon oxide nanowires by the GJ EBP CVD method using different diluent gases

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