scispace - formally typeset
Search or ask a question

Answers from top 10 papers

More filters
Papers (10)Insight
Taken together, the current findings on common scenarios (exfoliation, CVD growth, and transfer), while not inclusive of all graphene manufacturing processes, indicate very minimal graphene or particle exposure at facilities manufacturing graphenes with good manufacturing practices.
Our findings demonstrate a step forward to all-graphene transparent and flexible electronics.
We demonstrate that these etch masks have numerous advantages: they can be synthesized simply by heating a copper foil in air, deposited on graphene from a solution, they are inert to oxygen plasma, and can be removed from the substrate by dissolution in mild acids.
While oxidized graphene-containing surfaces are antimicrobial when either basal planes or sharp edges are exposed, graphene-containing surfaces are mainly effective when sharp edges are protruding, except for few studies showing effect due to graphene basal planes when coated over conductive materials.
The results showed that scaffolds coated with graphene are biocompatible and they can support cellular activity.
This work shows that not all graphene materials are beneficial for the detection at lab-on-chip devices.
Importantly, the as-made graphene can be readily dispersed into aqueous solution in the presence of surfactant and thus is compatible with various solution-processing techniques towards graphene-based thin film devices.
Electron-beam induced deposition on graphene might be used to create nanometer-scale doping patterns, diffraction gratings, or etch masks in this novel electronic material.
We show that sputter-coating graphene and graphene-like materials with zinc and dissolving the latter with dilute acid removes one graphene layer and leaves the lower layers intact.
Compared with conventional lithographic fabrication techniques, this new approach uses graphene edges as the templates or masks and offers advantage in technological simplicity and capability of creating small features below 10 nm scale.

Related Questions

What are disposable medical devices?4 answersDisposable medical devices are single-use devices used in medical treatments and procedures. They are designed to be used once and then discarded, reducing the risk of infection and cross-contamination. These devices can include a variety of products such as syringes, catheters, surgical masks, gloves, and wound dressings. They are typically made from materials that are sterile and safe for use on patients. Disposable medical devices play a crucial role in healthcare settings by providing a hygienic and convenient option for medical procedures. They help to maintain a sterile environment and prevent the spread of infectious diseases.
What is the efficacy of disposable face masks in preventing the spread of respiratory viruses?5 answersDisposable face masks have been found to be effective in preventing the spread of respiratory viruses, including COVID-19. Different types of masks have been evaluated, and it has been observed that N95 respirators provide the highest level of protection, especially when used continuously. However, pleated multilayer disposable face masks, which are commonly used by the public, often have poor face-fit, limiting their effectiveness in respiratory protection. Simple modifications to these masks, such as user-moldable full mask periphery wire, integrated earloop tension adjusters, and an inner flange to trap respiratory droplets, have been shown to significantly improve their fit and performance, approaching the efficacy of N95 respirators. It is important to note that the efficacy of face masks depends on factors such as the material, layers, fitting on the face, and user compliance. Overall, disposable face masks, when used correctly, can effectively reduce the transmission of respiratory viruses, but proper fit and adherence to guidelines are crucial for optimal protection.
Are graphene masks dangerous?9 answers
How do you know if your mask has graphene in it?9 answers
How much does a graphene coating cost?10 answers
Is graphene oxide cheap?10 answers

See what other people are reading

What is the specific function of membranes in microfluidic systems?
5 answers
Membranes in microfluidic systems serve various crucial functions. They enable separation and enrichment of substances, immobilization and culturing of cells, and fluid control of pumps and valves within the system. Membranes play a pivotal role in enhancing the performance of microfluidic platforms by facilitating sample pre-treatment, mixing, reactions, and especially separation and purification operations. Membranes with tunable microgeometry can be integrated into microfluidic systems to improve stability and functionality, allowing for the realization of complex preparative and analytical tasks. Additionally, membranes can be selectively permeable based on properties like hydrophilicity and hydrophobicity, enabling advanced flow control techniques in centrifugal microfluidic systems. Overall, membranes are essential components that contribute significantly to the efficiency and versatility of microfluidic devices.
How strain is defined in graphene at the atomic level?
5 answers
Strain in graphene at the atomic level refers to the deformation of the lattice structure due to external forces or defects. The atomic-scale response of graphene to strain can be observed through techniques like nanoindentation and transmission electron microscopy, allowing for precise measurements of bond lengths and strain distribution. By creating strain patterns in graphene, researchers can manipulate its properties and study the effects on charge carriers. While previous approaches focused on small strains, new discrete frameworks enable accurate calculations of strain-induced gauge fields even under large strains, providing insights into the mechanical and electrical behavior of strained graphene at the atomic level.
Why is inconel 718 good for additive manufacturing?
5 answers
Inconel 718 is well-suited for additive manufacturing (AM) due to its unique properties and the advancements made in AM processes. AM of Inconel 718 allows for the fabrication of near-net shape components with high shape and size accuracy, overcoming the challenges faced in conventional machining. Additionally, the use of Inconel 718 in AM has been successful in producing robust joints with improved mechanical properties, such as higher tensile strength and hardness, compared to traditional welding methods. Furthermore, the incorporation of Inconel 718 in AM processes, such as laser powder bed fusion (LPBF), has led to the development of innovative approaches like correlating nanomechanical properties with microstructure to enhance part performance and predictability. The material's compatibility with AM technologies and its ability to withstand harsh environments make Inconel 718 a favorable choice for additive manufacturing applications.
What are the potential applications and advantages of graphene-based membranes versus zeolite-based membranes in carbon dioxide separation, and?
4 answers
Graphene-based membranes and zeolite-based membranes each offer unique advantages for carbon dioxide separation, with potential applications that leverage their distinct properties. Graphene-based membranes are celebrated for their high separation potential, attributed to their tunable nanosized channels, high surface area, and porosity, which are crucial for efficient ion and molecule separation. The solvent-ink-jet printing technique described for graphene layers indicates a novel approach to overcoming challenges in scalable manufacturing, showing promising CO2 separation performance with a significant decrease in CO2 composition in permeate. Graphene oxide (GO), in particular, has shown great potential in membrane-based separation, with its incorporation into membranes enhancing permeation and metal ions rejection rates, indicating its versatility beyond gas separation to applications like heavy metals removal from polluted water. On the other hand, zeolite membranes, as compiled in a review, have seen recent advancements that significantly improve selectivities and permeances for CO2 and N2, suggesting reduced energy demand and lower operational costs. However, their commercial deployment requires further studies to assess long-term operation and separation performance in multicomponent systems. Zeolitic imidazolate frameworks (ZIFs), a subset of zeolite membranes, when modified with graphene nanoribbons (GNRs), have shown to rigidify the framework, leading to high H2/CO2 separation performance, indicating their potential application in blue hydrogen production. Comparatively, graphene-based membranes offer broader application potential due to their mechanical properties and tunability, which are advantageous for both gas separation and water treatment. Zeolite membranes, with their improved selectivity and permeance for specific gases, present a cost-effective option for industrial gas separation processes. The integration of graphene or GNRs into zeolite frameworks combines the strengths of both materials, suggesting a synergistic approach for enhancing separation performance.
How do thy make AlON transparent ceramics ?
5 answers
Transparent AlON ceramics are fabricated using various methods. One approach involves selecting robust additives like CaCO3 to suppress the transformation between AlON and Al2O3 + AlN during heating, enabling fast preparation with high transmittance levels. Another method involves direct non-aqueous tape casting of Al2O3/AlN slurry followed by one-step reaction sintering, resulting in high-transmittance AlON ceramic wafers. For MgAlON ceramics, a two-step heating strategy is proposed, involving solid-state reaction of MgAl2O4 and AlON powders via pressureless sintering, leading to highly infrared transparent ceramics with significant transmittance levels. Additionally, a wet-chemical method is utilized to coat sintering aids on AlON powder surfaces, ensuring homogeneous distribution and nano-size sintering aids for improved properties in pressureless sintered AlON.
Why nitrigen doped graohene is better that graphene for gas sensing?
5 answers
Nitrogen-doped graphene exhibits enhanced gas-sensing capabilities compared to pristine graphene due to several key factors. Firstly, the introduction of nitrogen into the graphene lattice induces a band gap, which is absent in pristine graphene, thereby improving its electrical conductivity and sensitivity to gas molecules. This modification allows for a more pronounced modulation of electrical conductivity in response to gas adsorption, making nitrogen-doped graphene a superior material for detecting various gases. The doping process also generates defects and increases the surface area, which maximizes the interaction between the surface and gas molecules, further enhancing the gas-sensing performance. Density Functional Theory (DFT) studies have shown that nitrogen-doped graphene sheets exhibit selective binding to different gases, such as carbon monoxide, carbon dioxide, and oxygen, which is crucial for the development of selective gas sensors. The electronic structures of these doped graphene sheets are altered in a way that improves their ability to detect specific gases. Additionally, the presence of nitrogen creates special binding sites that are beneficial for near-surface interaction with gas molecules, significantly changing the electronic characteristics of graphene and its derivatives and expanding its potential use as gas sensors. Experimental research has demonstrated that nitrogen-doped graphene sensors are responsive to low concentrations of gases at room temperature, showcasing higher sensitivity and excellent reproducibility compared to their undoped counterparts. Furthermore, the introduction of nitrogen into graphene has been shown to facilitate stronger chemisorption of gas molecules, such as NO2, leading to higher sensitivity and selectivity towards these gases. The codoping of heteroatoms, including nitrogen, in graphene has been explored to further improve gas sensing properties, indicating that nitrogen doping is a key strategy in enhancing the performance of graphene-based gas sensors. In summary, nitrogen doping enhances the gas-sensing capabilities of graphene by introducing a band gap, generating defects, increasing surface area, and creating specific binding sites for gas molecules, which collectively contribute to improved sensitivity, selectivity, and overall performance of gas sensors.
What is the definition of additive manufacturing (3D printing)?
5 answers
Additive manufacturing, commonly known as 3D printing, is a revolutionary fabrication technique where materials are added layer by layer to create three-dimensional objects. This technology has transformed various industries, enabling mass customization and the production of open-source designs in agriculture, healthcare, automotive, locomotive, and aviation sectors. In the realm of biomedical applications, additive manufacturing has facilitated the design and fabrication of custom biomaterials and devices with intricate structures and adjustable properties, such as implants, prosthetics, and orthotics. Recent advancements have focused on enhancing the quality and functionality of 3D-printed biomaterials through innovative design strategies like library-based design, topology optimization, bio-inspired design, and meta-biomaterials. The Industrial Internet Reference Architecture has also been utilized to describe additive manufacturing systems as part of the Industrial Internet of Things, aiding in structuring business visions related to this technology.
What are the current advancements in the development of piezoresistive pressure sensors based on poly-silicon?
5 answers
Current advancements in piezoresistive pressure sensors based on poly-silicon include the utilization of silicon nanowires (SiNWs) for enhanced sensing capabilities. SiNWs exhibit unique one-dimensional electronic structures, making them ideal for various applications such as biosensors, FETs, and piezoresistive pressure sensors. Additionally, the development of flexible piezoresistive membranes using polymer solutions has shown promising results, with increased sensitivity and gauge factors for piezoresistive sensing applications. Furthermore, the integration of ultra-thin graphene foam (GRF) with polydimethylsiloxane (PDMS) in piezoresistive pressure sensors has demonstrated sensitivity to pressures ranging from 0 to >100kPa, although not yet comparable to current sensors. These advancements highlight the diverse approaches being explored to enhance the performance and applications of poly-silicon-based piezoresistive pressure sensors.
How does chemical vapor growth of graphene work?
5 answers
Chemical vapor deposition (CVD) for graphene growth involves complex gas-phase surface reactions, mass, momentum, and energy transfer processes. Factors like temperature, pressure, and reactor design play crucial roles in optimizing graphene synthesis. Electric fields applied during CVD can significantly impact graphene growth, enabling selective or rapid growth of clean films. Direct CVD of graphene on specific substrates like 3C-SiC can be challenging due to low carbon atom diffusion, necessitating alternative methods like PECVD for successful growth. A modified CVD method utilizing ceramic plates and defect-rich vertical graphene accelerates graphene growth without increasing nucleation density, enabling rapid millimeter-sized graphene grain production in minutes. Overall, CVD processes involve intricate mechanisms combining chemical reactions, transport phenomena, and reactor optimization to achieve efficient graphene synthesis.
Solid state foaming process PCL possible?
4 answers
The solid-state foaming process of Poly(e-caprolactone) (PCL) is indeed feasible and has been extensively studied in various research papers. Studies have shown that utilizing supercritical carbon dioxide (scCO2) as a physical blowing agent enables the successful foaming of PCL. The incorporation of other materials such as Poly (lactic-co-glycolic acid) (PLGA), hydroxyapatite, nanocellulose, carboxymethylcellulose, and graphene oxide has been explored to enhance the properties of the foamed PCL structures. Optimal process parameters have been identified, including pressure, temperature, and time, to achieve structures suitable for biomedical applications. The biocompatibility of the resulting PCL foams has been confirmed, making them suitable for use in artificial scaffolds for cell culture in biomedical engineering.
Solid state foaming process pure PCL possible?
5 answers
Yes, the solid-state foaming process of pure poly(e-caprolactone) (PCL) is feasible. Research has shown that PCL can be foamed using supercritical carbon dioxide (scCO2) as a physical blowing agent, resulting in porous structures with controllable properties. Additionally, studies have explored the use of non-toxic and environmentally friendly blowing agents, such as supercritical mixtures of carbon dioxide (CO2) and ethyl lactate (EL), to foam PCL at relatively low temperatures. Furthermore, investigations into the foaming behavior of PCL with nitrogen as the foaming agent have provided insights into the correlation between foam structure and processing variables, aiding in the design of PCL foams with desired properties. Therefore, the solid-state foaming of pure PCL is not only possible but can also be tailored to achieve specific characteristics for various applications.