scholarly journals Application of Molecular Vapour Deposited Al2O3 for Graphene-Based Biosensor Passivation and Improvements in Graphene Device Homogeneity

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 2121
Author(s):  
Muhammad Munem Ali ◽  
Jacob John Mitchell ◽  
Gregory Burwell ◽  
Klaudia Rejnhard ◽  
Cerys Anne Jenkins ◽  
...  
Keyword(s):  
Vapour Deposition ◽  
Point Of Care ◽  
Device Performance ◽  
Graphene Surface ◽  
Wafer Scale ◽  
Passivation Film ◽  
Transfer Processes ◽  
Sensor Device ◽  
Graphene Devices ◽  
Deposition Technology

Graphene-based point-of-care (PoC) and chemical sensors can be fabricated using photolithographic processes at wafer-scale. However, these approaches are known to leave polymer residues on the graphene surface, which are difficult to remove completely. In addition, graphene growth and transfer processes can introduce defects into the graphene layer. Both defects and resist contamination can affect the homogeneity of graphene-based PoC sensors, leading to inconsistent device performance and unreliable sensing. Sensor reliability is also affected by the harsh chemical environments used for chemical functionalisation of graphene PoC sensors, which can degrade parts of the sensor device. Therefore, a reliable, wafer-scale method of passivation, which isolates the graphene from the rest of the device, protecting the less robust device features from any aggressive chemicals, must be devised. This work covers the application of molecular vapour deposition technology to create a dielectric passivation film that protects graphene-based biosensing devices from harsh chemicals. We utilise a previously reported “healing effect” of Al2O3 on graphene to reduce photoresist residue from the graphene surface and reduce the prevalence of graphene defects to improve graphene device homogeneity. The improvement in device consistency allows for more reliable, homogeneous graphene devices, that can be fabricated at wafer-scale for sensing and biosensing applications.

Techniques for the Dry Transfer of Epitaxial Graphene onto Arbitrary Substrates

2010 ◽  
Vol 645-648 ◽  
pp. 633-636 ◽  
Author(s):  
Joshua D. Caldwell ◽  
Travis J. Anderson ◽  
Karl D. Hobart ◽  
James C. Culbertson ◽  
Glenn G. Jernigan ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Epitaxial Graphene ◽  
Large Area ◽  
Wafer Scale ◽  
Transfer Processes ◽  
Thermal Release ◽  
Graphene Films ◽  
High Carrier ◽  
The Impact

Epitaxial graphene (EG) grown on the carbon-face of SiC has been shown to exhibit high carrier mobilities, in comparison to other growth techniques amenable to wafer-scale graphene fabrication. The transfer of large area (>mm2) graphene films to substrates amenable for specific applications is desirable. We demonstrate the dry transfer of EG from the C-face of 4H-SiC onto SiO2, GaN and Al2O3 substrates via two approaches using either 1) thermal release tape or 2) a spin-on, chemically-etchable dielectric. We will report on the impact that these transfer processes has upon the electrical properties of the transferred EG films.

Formation and Optical Properties of Polycyclic Aromatic Cluster in Nanocrystalline Diamond Film

2011 ◽  
Vol 687 ◽  
pp. 647-650
Author(s):  
Nan Chun Wu ◽  
Yi Ben Xia ◽  
Lin Jun Wang
Keyword(s):  
Optical Properties ◽  
Diamond Film ◽  
Vapour Deposition ◽  
Chemical Vapour ◽  
Nanocrystalline Diamond ◽  
Polycyclic Aromatic ◽  
Aromatic Clusters ◽  
Aromatic Cluster ◽  
Photoluminescence Emission Spectrum ◽  
Deposition Technology

With electron assisted chemical vapour deposition technology, some nanocrystalline diamond films have been deposited, which precipitate polycyclic aromatic clusters in the film matrix. Optical properties of the films have been characterized. The results of characteristics show that Raman and photoluminescence spectrum of the films conform to identity of pyrene except for diamond peaks; photoluminescence emission spectrum of the films show stronger emission peaks at 385nm and 470nm. Our results show that purer polycyclic aromatic clusters of four fused sixfold ring, which are the same as pyrene in structure, can form in the nanocrystalline diamond film matrix by bombarding the films with electrons.

scholarly journals Модификация атомной и электронной структуры поверхности полупроводников А-=SUP=-III-=/SUP=-В-=SUP=-V-=/SUP=- на границе с растворами электролитов О б з ор

2020 ◽  
Vol 54 (7) ◽  
pp. 587
Author(s):  
М.В. Лебедев
Keyword(s):  
Electronic Structure ◽  
Electrolyte Solutions ◽  
Semiconductor Nanostructures ◽  
Semiconductor Surface ◽  
Device Performance ◽  
Transfer Processes ◽  
The Relationship ◽  
Theoretical Results ◽  
Atomic And Electronic Structure ◽  
Modification Of The Surface

Recent experimental and theoretical results on modification of the surface atomic and electronic structure of various III–V semiconductor with electrolyte solutions are reviewed. The relationship between the chemical and charge transfer processes that proceed at the semiconductor/electrolyte interfaces and accompanying modification of the semiconductor surface atomic and electronic structure is revealed. Advances in the application of electrolyte solutions for modification of the semiconductor nanostructures and device performance are discussed.

scholarly journals A wafer-scale Bernal-stacked bilayer graphene film obtained on a dilute Cu (0.61 at% Ni) foil using atmospheric pressure chemical vapour deposition

RSC Advances ◽  
2016 ◽  
Vol 6 (34) ◽  
pp. 28370-28378 ◽  
Author(s):  
M. J. Madito ◽  
N. Manyala ◽  
A. Bello ◽  
J. K. Dangbegnon ◽  
T. M. Masikhwa ◽  
...  
Keyword(s):  
Chemical Vapour Deposition ◽  
Atmospheric Pressure ◽  
Vapour Deposition ◽  
Graphene Film ◽  
Chemical Vapour ◽  
Bilayer Graphene ◽  
Wafer Scale ◽  
Pressure Chemical

A wafer-scale (scale of an entire foil) AB-stacked bilayer graphene film obtained on a dilute Cu(Ni) foil using AP-CVD.

scholarly journals Tongue Rehabilitation Device for Dysphagic Patients

Sensors ◽  
2019 ◽  
Vol 19 (21) ◽  
pp. 4657 ◽  
Author(s):  
Mario Milazzo ◽  
Andrea Panepinto ◽  
Angelo Maria Sabatini ◽  
Serena Danti
Keyword(s):  
Mechanical Model ◽  
Ball Bearing ◽  
Point Of Care ◽  
Angular Displacement ◽  
Force Sensor ◽  
Pressure Force ◽  
Sensor Device ◽  
Speech Therapist ◽  
Angular Displacements ◽  
Dysphagic Patients

Dysphagia refers to difficulty in swallowing often associated with syndromic disorders. In dysphagic patients’ rehabilitation, tongue motility is usually treated and monitored via simple exercises, in which the tongue is pushed against a depressor held by the speech therapist in different directions. In this study, we developed and tested a simple pressure/force sensor device, named “Tonic Tongue (ToTo)”, intended to support training and monitoring tasks for the rehabilitation of tongue musculature. It consists of a metallic frame holding a ball bearing support equipped with a sterile disposable depressor, whose angular displacements are counterbalanced by extensional springs. The conversion from angular displacement to force is managed using a simple mechanical model of ToTo operation. Since the force exerted by the tongue in various directions can be estimated, quantitative assessment of the outcome of a given training program is possible. A first prototype of ToTo was tested on 26 healthy adults, who were trained for one month. After the treatment, we observed a statistically significant improvement with a force up to 2.2 N (median value) in all tested directions of pushing, except in the downward direction, in which the improvement was slightly higher than 5 N (median value). ToTo promises to be an innovative and reliable device that can be used for the rehabilitation of dysphagic patients. Moreover, since it is a self-standing device, it could be used as a point-of-care solution for in-home rehabilitation management of dysphasia.

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