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ACS Editors’ Choice Article on MXene Gas Sensors

Researchers from the Nanomaterials Group have just published a high-impact article on MXene gas sensors produced with our KAIST collaborators:
S. J. Kim, H.-J. Koh, C. E. Ren, O. Kwon, K. Maleski, S.-Y. Cho, B. Anasori, C.-K. Kim, Y.-K. Choi, J. Kim, Y. Gogotsi, H.-T. Jung, Metallic Ti3C2Tx MXene gas sensors with ultrahigh signal-to-noise ratio, ACS Nano, (2018)
It has been selected by ACS as ACS Editors’ Choice article and published Open Access ($3000 fee waived). ACS selects a  paper per day (less than 1% of all papers published) from more than 50 ACS journals as “Editors’ Choice”, so it’s an important recognition that adds visibility to our paper.
We demonstrate that a metallic 2D MXene gas-sensing channel with high conductivity greatly outperforms conventional sensing materials in two critical aspects. First, a Ti3C2Tx gas sensor exhibits a limit of detection of 50~100 parts per billion (ppb) for volatile organic compounds, which is one of the lowest limits of their detection at room temperature ever reported. Second, the extremely low noise of metallic Ti3C2Tx leads to the signal-to-noise ratio two orders of magnitude higher than that of the published sensors. This study introduces a paradigm shift from semiconducting to metallic sensing channels for developing highly sensitive sensors.
The first author, Seon Joon (Steven) Kim, is a former visiting student who spent 6 months at Drexel during his PhD study. We expect him to come back to Drexel as a visiting post-doctoral scientist supported by our NNFC-KAIST-Drexel Nano Co-op Center soon.
Congratulations to Steven, Kathleen, Evelyn, Babak and other co-authors!

2D MXenes Make Photonic Diodes

Our work featuring the first ever “optical” diodes made from the 2D material Ti3C2 and fullerene (or carbon-60) is featured on the international Nanotech website.  View the full press release here

Y. Dong, S. Chertopalov, K. Maleski, B. Anasori, L. Hu, V. Mochalin, S. Bhattacharya, A. M. Rao, Y. Gogotsi, R. Podila, Saturable absorption in 2D Ti3C2MXene thin films for passive photonic diodes, Advanced Materials, (2018)
New Energy Storage Technologies for Enabling Renewables at CHF

New Energy Storage Technologies for Enabling Renewables at CHF

Prof. Yury Gogotsi and Prof. M. Stanley Whittingham, professor of chemistry and materials science and engineering, SUNY Binghamton presented “New Energy Storage Technologies for Enabling Renewables” at the Chemical Heritage Foundation. 
Many systems and devices we use every day, including our cell phones and laptops, require batteries. Electric cars, solar and wind farms, and off-grid homes need much larger batteries. And we expect smart clothes and the internet to change how we live and how we gather and consume information in the near future. They will all need to be powered, but by much smaller, more flexible, and longer-lasting energy storage devices. The speakers presented on the discovery of the lithium battery and the long journey from the Sony camcorder battery to the modern lithium-ion battery. They also explained what is coming after lithium-ion batteries. In particular, “batteries on steroids,” or electrochemical capacitors, that now power buses in many Chinese cities, open the doors of an Airbus 380 in an emergency, and harvest braking energy from SEPTA trains, will be discussed. Finally, future flexible, transparent, microscale, wearable, and other energy storage devices that are expected to become ubiquitous within the next decade will be discussed. View pictures from the event below.

Meikang Han ranked #1 among all PhD candidates at NWPU in 2017

Meikang Han, our visiting student from Northwestern Polytechnical University (NWPU) in Xi’an, China, has been ranked #1 among all PhD candidates at NWPU in 2017. The rank depends on student’s achievements in the past year (papers, patents, funding, etc.). In 2017, he published 11 papers (4 first-author papers and 7 co-authored papers, 3 papers are Highly Cited in Web of Science – top 1%), obtained 3 patents and obtained 3 different fellowships/grants in support of his study/research.
Meikang has also been nominated for an Outstanding Student Award from Ministry of Industry and Information Technology of China for his work on electromagnetic applications of 2D materials. This is  a high-level national award given to no more than ten graduate students every year. Congratulations!