A new process for growing wafer-scale 2D crystals could enable future super-thin electronics.

Since the discovery of the remarkable properties of graphene, scientists have increasingly focused research on the many other two-dimensional materials possible, both those found in nature and those concocted in the lab.

Growing high-quality, crystalline 2D materials at scale, however, has proven a significant challenge.

Researchers led by Joan Redwing, director of the National Science Foundation-sponsored Two-Dimensional Crystal Consortium—Materials Innovation Platform, and professor of materials science and engineering and electrical engineering at Penn State, developed a multistep process to make single crystal, atomically thin films of tungsten diselenide across large-area sapphire substrates.

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The portable biosensor can test specific cardiac markers in five minutes with a single drop of blood.
Credit: Yu-Lin Wang

A team of researchers from National Tsing Hua University and National Cheng Kung University, both in Taiwan, has developed a low-cost, portable medical sensor package that has the potential to alert users of medical issues ranging from severe heart conditions to cancer, according to a new study published in the ECS Journal of Solid State Science and Technology.

Portable medical devices have become an integral part of holistic health care, exhibiting huge potential in monitoring, medical therapeutics, diagnosis, and fitness and wellness. When paired with benchtop point-of-care instruments used in hospitals and urgent care centers, individuals are able to both increase preventative care measures and gain a more complete picture of their health.

According to the open access paper, “Field-Effect Transistor-Based Biosensors and a Portable Device for Personal Healthcare” (ECS J. Solid State Sci. Technol., 6, Q71 [2017]), researchers have reported the design, development, fabrication, and prototyping of a low-cost transistor-based device that can measure the C-reactive protein (CRP) in bloodstreams, which, when elevated, indicates inflammation that could be linked to heart attack, stroke, coronary artery disease, and a host of other medical diagnosis.

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Building on the success of the first ECS Data Sciences Hack Day at the 232nd ECS Meeting this past October 2017, ECS is pleased to offer another opportunity at the 233rd ECS Meeting in Seattle this May.

ECS Data Sciences Hack Week is the Society’s foray into building an electrochemical data sciences and open source community from the ground up. Dataset sharing and open source software have transformed many “big science” areas such as astronomy, particle physics, synchrotron science, protein and genomic sciences, as well as computational sciences. The goal of this event is to increase awareness and impact of data science tools, open source software, and shared datasets in electrochemistry by bringing together people from different backgrounds to collaborate.

Data science tools and approaches have the potential to transform bench science like electrochemistry. The critical need is to build a community of electrochemical data scientists, the people who will contribute to a growing library of shared experimental and computational datasets, and who develop and adapt open source software tools.

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In a recent survey of over 100 corresponding authors who published in ECS journals, over 55% of respondents said the speed from initial manuscript submission to publication was faster than expected, and nearly 25% said it was very fast.

The survey also asked the authors to rate ECS’s turnaround speed during specific periods of the publication process: (1) from initial submission to first decision, (2) from manuscript acceptance to receipt of page proofs, and (3) from manuscript acceptance to publication.

Here are the key takeaways:

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Stress a muscle and it gets stronger. Mechanically stress a new rubbery material—say with a twist or a bend—and it automatically stiffens by up to 300 percent, the engineers say.

In lab tests, mechanical stresses transformed a flexible strip of the material into a hard composite that can support 50 times its own weight.

This new composite material doesn’t need outside energy sources such as heat, light, or electricity to change its properties. And it could be used in a variety of ways, including applications in medicine and industry.

The researchers found a simple, low-cost way to produce particles of undercooled metal—that’s metal that remains liquid even below its melting temperature. Researchers created the tiny particles (they’re just 1 to 20 millionths of a meter across) by exposing droplets of melted metal to oxygen, creating an oxidation layer that coats the droplets and stops the liquid metal from turning solid. They also found ways to mix the liquid-metal particles with a rubbery elastomer material without breaking the particles.

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The ECS honors and awards program promotes technical achievements in electrochemistry and solid state science and technology. The program also recognizes exceptional service to the Society. Recognition opportunities exist in the following categories: Society awards, division awards and section awards.

You are invited to nominate qualified candidates for the following electrodeposition division awards that will be recognized at the 234th ECS biannual meeting, also known as AiMES 2018, which takes place in Cancun, Mexico from September 30 thru October 4.

ELDP Early Career Investigator Award: established in 2015 to recognize an outstanding early career researcher in the field of electrochemical deposition science and technology. Early recognition of highly qualified scientists is intended to enhance his/her stature and encourage especially promising researchers to remain active in the field. The 2017 winner of this award was the University of Akron’s Jiahua Zhu who presented an award talk called “Magnetocapacitive Carbon Nanocomposites” at our last biannual meeting.

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Researchers have developed a new titanium-based material that is a good candidate for making lead-free, inorganic perovskite solar cells.

In a new paper, which appears in the journal Joule, the researchers show that the material is especially good for making tandem solar cells—arrangements in which a perovskite cells are placed on top of silicon or another established material to boost the overall efficiency.

Perovskites have emerged as a promising alternative to silicon for making inexpensive and efficient solar cells. But for all their promise, perovskites are not without their downsides. Most contain lead, which is highly toxic, and include organic materials that are not particularly stable when exposed to the environment.

“Titanium is an abundant, robust, and biocompatible element that, until now, has been largely overlooked in perovskite research,” says senior author Nitin Padture, professor of engineering and director of the Institute for Molecular and Nanoscale Innovation.

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Scientists who introduced laser-induced graphene (LIG) enhanced their technique to produce what may become a new class of edible electronics.

The chemists, who once turned Girl Scout cookies into graphene, are investigating ways to write graphene patterns onto food and other materials to quickly embed conductive identification tags and sensors into the products themselves.

“This is not ink,” says James Tour, chair of chemistry and professor of computer science and of materials science and nanoengineering at Rice University. “This is taking the material itself and converting it into graphene.”

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Why attend?

Consider ECS the prologue to your success story. As the must-attend event for academic and industry professionals from across the globe, it introduces you to the electrochemical and solid state science and technology trends, insights, and players who can help you make major strides in your career.

ECS meetings offer five days of learning, technical presentations, business development and networking opportunities for scientists, engineers and industry leaders from more than 70 countries. With a wide range of technical sessions, social events and hands-on courses, ECS meetings are the best investment you can make in your career.

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In a recently published ECS Journal of Solid State Science and Technology paper, ECS member Roger Loo and coauthors describe a new epitaxial growth technology and address the challenges of implementation. The open access article, “Epitaxial CVD Growth of Ultra-Thin Si Passivation Layers on Strained Ge Fin Structures,” was designated Editors’ Choice due to its significance and the importance of the technology described.

“The work combines carefully thought out and elegant experimental work, with appropriate simulation work that compliments the experiments,” said Jennifer Bardwell, ECS Journal of Solid State Science and Technology technical editor in the area of electronic materials and processing. “I am certain that it will be of great interest to many of our readers.”

We recently sat down with Loo to discuss the work and its impact on the field.

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