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Wafer-scale synthesis of monolayer WS 2 for high-performance flexible photodetectors by enhanced chemical vapor deposition

May 26, 2018 - 3:45am
Abstract Two-dimensional (2D) nanomaterials have recently attracted considerable attention due to their promising applications in next-generation electronics and optoelectronics. In particular, the large-scale synthesis of high-quality 2D materials is an essential requirement for their practical applications. Herein, we demonstrate the wafer-scale synthesis of highly crystalline and homogeneous monolayer WS2 by an enhanced chemical vapor deposition (CVD) approach, in which precise control of the precursor vapor pressure can be effectively achieved in a multi-temperature zone horizontal furnace. In contrast to conventional synthesis methods, the obtained monolayer WS2 has excellent uniformity both in terms of crystallinity and morphology across the entire substrate wafer grown (e.g., 2 inches in diameter), as corroborated by the detailed characterization. When incorporated in typical rigid photodetectors, the monolayer WS2 leads to a respectable photodetection performance, with a responsivity of 0.52 mA/W, a detectivity of 4.9 × 109 Jones, and a fast response speed (< 560 μs). Moreover, once fabricated as flexible photodetectors on polyimide, the monolayer WS2 leads to a responsivity of up to 5 mA/W. Importantly, the photocurrent maintains 89% of its initial value even after 3,000 bending cycles. These results highlight the versatility of the present technique, which allows its applications in larger substrates, as well as the excellent mechanical flexibility and robustness of the CVD-grown, homogenous WS2 monolayers, which can promote the development of advanced flexible optoelectronic devices.
Categories: Nanotechnology News

Researchers seek to improve quality control for nanomanufacturing

May 26, 2018 - 3:45am
New monitoring tool would be able to detect imperfections almost instantaneousl.
Categories: Nanotechnology News

How to eliminate a graphene oxide 'oil spill' accident

May 26, 2018 - 3:45am
Carbon nanomaterials, including graphene-based materials, are widely gaining popularity in practical applications of nanomanufacturing. As a result, it becomes more and more likely that the unwanted introduction of such materials into the environment may occur. In particular, aqueous habitats might be severely affected by any accidental carbon nanomaterials exposure. Researching these potential environmental toxicity effects, scientists have found that kaolin, a cheap and abundant clay, can act as a powerful antidote to remediate the toxic effects of graphene oxide.
Categories: Nanotechnology News

Pitt's Mostafa Bedewy receives top honor from Society of Manufacturing Engineers - EurekAlert (press release)

May 26, 2018 - 3:45am
EurekAlert (press release)Pitt's Mostafa Bedewy receives top honor from Society of Manufacturing EngineersEurekAlert (press release)In recognition of his contributions to the field of nanomanufacturing, Mostafa Bedewy was named a 2018 recipient of the Outstanding Young Manufacturing Engineer Award from the Society of Manufacturing Engineers (SME). Dr. Bedewy is assistant professor ...
Categories: Nanotechnology News

Hilco Industrial to Sell Ultra-High Precision Nanomanufacturing Facility - PR Newswire (press release)

May 26, 2018 - 3:45am
Hilco Industrial to Sell Ultra-High Precision Nanomanufacturing FacilityPR Newswire (press release)NORTHBROOK, Ill., May 23, 2018 /PRNewswire/ -- Hilco Industrial, LLC, in joint venture with Machinery Network Auctions, announced they are offering for sale all the machinery & equipment from a manufacturer of LED light guides and optic lenses.and more »
Categories: Nanotechnology News

Nano: a cleaner option?

May 26, 2018 - 3:45am
Could nanotechnology tidy up the planet without leaving a dangerous residue of its own?It's likely that you've recently swirled nanotechnology down your sink. Antimicrobial silver nanoparticles, for example, are added to food containers, socks, and cleaning products such as floor polish. But could nanoparticles – measuring less than 100 nanometres wide – clean more than just your house? Could nanotechnology tidy up the planet without leaving a dangerous residue of its own?The European Environment Agency estimates that "potentially polluting activities" have occurred at nearly three million EU sites. But nanoparticles could remediate water, soil and air polluted by compounds such as heavy metals and aromatic hydrocarbons. With high reactivity and a larger surface area than the same mass of material in a larger form, nanoparticles are prime candidates for capturing and destroying pollutants. Continue reading...
Categories: Nanotechnology News

New nanomaterial risk assessment project kicked off

March 6, 2018 - 4:47am
The newly started H2020 GRACIOUS project will develop a highly innovative science-based framework that supports the assessment of risk posed by the ever increasing array of nanomaterials on the market and under development.
Categories: Nanotechnology News

Smart new method to manufacture organic solar cells

March 6, 2018 - 4:47am
Researchers have developed an improved method to manufacture these thin and flexible solar cells.
Categories: Nanotechnology News

Mass production of new class of carbon nanotube semiconductors closer to reality

March 6, 2018 - 4:47am
Chemists have found a way to simultaneously control the orientation and select the size of single-walled carbon nanotubes deposited on a surface.
Categories: Nanotechnology News

Scalable two-dimensional materials advance future-gen electronics

March 6, 2018 - 4:47am
Researchers have developed a multistep process to make single crystal atomically-thin films of tungsten diselenide across large-area sapphire substrates.
Categories: Nanotechnology News

Accelerating the self-assembly of nanoscale patterns for next-generation materials

March 6, 2018 - 4:47am
Using polymer blends, scientists rapidly generated highly ordered patterns that could be used in the fabrication of microelectronics, antireflective surfaces, magnetic data storage systems, and fluid-flow devices.
Categories: Nanotechnology News

Gecko adhesion technology moves closer to industrial uses

March 6, 2018 - 4:47am
Scientists are looking into how gecko adhesion technology could be applied in a high-precision industrial setting, such as in robot arms used in manufacturing computer chips.
Categories: Nanotechnology News

Tailor-made nanomembranes offer a cleaner method for industrial separation

March 6, 2018 - 4:47am
A superior membrane, with a higher pore density, is produced through synthesizing this polyacrylonitrile nanofiltration membrane using an ionic liquid solvent.
Categories: Nanotechnology News

WHO guidelines on protecting workers from potential risks of manufactured nanomaterials

March 6, 2018 - 4:47am
The World Health Organization proposes new guidelines to policy makers and professionals in the field of occupational health and safety with recommendations on how best to protect workers from the potential risks of manufactured nanomaterials.
Categories: Nanotechnology News

Eco-friendly waterborne semiconductor inks using surfactant

March 6, 2018 - 4:47am
Researchers have developed a technology to produce environmentally friendly water-borne semiconductor inks using surfactant. The result is expected to be applied to various electronic devices with a semiconductor surface control technique.
Categories: Nanotechnology News

Ultra-thin graphene-based encapsulation for OLEDs

March 6, 2018 - 4:47am
Researchers have reported on improved performance of graphene-based moisture barrier layers. By combining catalytic CVD and ALD they created in scalable fashion nanolaminates of few-layer graphene and aluminium oxid. Unlike previous reports, this new approach exploits the synergy between different materials and growth techniques. These nanolaminates also are a potential material to be included in standard multi-stacked barrier layers to enhance the performance of existing ALD aluminium oxide and produce next generation moisture barriers.
Categories: Nanotechnology News