Research Highlights

Research Highlights

Revealing the Role of Caged Cations in Hybrid Perovskites

Using samples synthesized at CNMS, a combination of neutron scattering, x-ray scattering, and density functional calculations shows that disordering of the large organic cations in hybrid perovskites is crucial and beneficial for their optoelectronic properties.

B. Yang, W. Ming, M-H. Du, J. Keum, A. A. Puretzky, C. M. Rouleau, J. Huang, D. B. Geohegan, X. Wang, and K. Xiao, "Real-time observation of order-disorder transformation of organic cations induced phase transition and anomalous photoluminescence in hybrid perovskites," Adv. Mater. (2018).  DOI: 10.1002/adma.201705801

The Electrolysis of Nitrogen Gas to Ammonia

A physical catalyst, similar to the one previously reported for the reduction of CO2 to ethanol, is used to electrochemically reduce nitrogen gas to ammonia at room temperature. 

Y. Song, D. Johnson, R. Peng, D. K. Hensley, P. V. Bonnesen, L. Liang, J. Huang, F. Yang, F. Zhang, R. Qiao, A. P. Baddorf, T. J. Tschaplinski, N. L. Engle, M. C. Hatzell, Z. Wu, D. A. Cullen, H. M. Meyer, B. G. Sumpter and A. J. Rondinone, "A physical catalyst for the electrolysis of nitrogen to ammonia," Science Advances 4, 4 (2018).  DOI: 10.1126/sciadv.1700336

Tunable 3D Nanoresonators for Gas-Sensing Applications

 Improvements in 3D nanofabrication using electron beam induced deposition lead to the mechanical stiffness that is needed to form a resonator structure, which then can be used as nanoprinted sensor. 

G. Arnold, R. Winkler, M. Stermitz, A. Orthacker, J-H. Noh, J. D. Fowlkes, G. Kothleitner, M. Huth, P. D. Rack, and H. Plank, "Tunable 3D Nanoresonators for Gas-Sensing Applications,"  Advanced Functional Materials (2018). DOI: 10.1002/adfm.201707387

Optical Manipulation of Magnetism in Iron Oxide Nanoparticles

Studies of light-induced magnetization changes in iron oxide nanoparticles show a transition from ferrimagnetic to superparamagnetic. 

S. He, J. S. DuChene, J. Qiu, A. A. Puretzky, Z. Gai, and W. D. Wei, "Persistent photomagnetism in superparamagnetic iron oxide nanoparticles," Advanced Electronic Materials (2018).  DOI: 10.1002/aelm.201700661R2

Quantifying the Spatiotemporal Dynamics of Plant Colonization by Beneficial Bacteria in a Microfluidic Habitat

A custom-fabricated microfluidic platform was used to culture and quantify the colonization kinetics and spatial distribution of beneficial bacteria on plant roots.

A. Aufrecht, C. M. Timm, A. Bible, J. L. Morrell-Falvey, D. A. Pelletier, M. J. Doktycz, S. T. Retterer, Quantifying the spatiotemporal dynamics of plant root colonization by beneficial bacteria in a microfluidic habitat," Advanced Biosystems 1800048, 1-12 (2018).  DOI: 10.1002/adbi.201800048

CNMS Nanofabrication Capabilities Enable QIS Studies

CNMS nanofabrication capabilities were used to create samples that enable cathodoluminescence (CL) observations in a Scanning Transmission Electron Microscope (STEM), illustrating the strong connection between CNMS and the QIS group, and demonstrating key capabilities of interest to the QIS community: Plasmon modes were visualized in e-beam patterned Archimedean nanospirals (J.A. Hachtel et al, Optics Lett., 43, 927 (2018). DOI: 10.1364/OL.43.000927), and strong photon correlations were measured in patterned nanodiamond (M.A. Feldman et al., Phys. Rev. B, 97, 081404(R) (2018). DOI: 10.1103/PhysRevB.97.081404)

Multipurpose Argon Ion Beam for Processing Graphene

Cleaning, milling, and modifying graphene is now possible in a single tool, using Ar ion clusters.

S. Kim, A. V. Ievlev, J. Jakowski, I. V. Vlassiouk, X. Sang, C. Brown, O. Dyck, R. R. Unocic, S. V. Kalinin, A. Belianinov, B. G. Sumpter, S. Jesse, O. S. Ovchinnikova, "Multi-purposed Ar gas cluster ion beam processing for graphene engineering," Carbon 131, 142 (2018). DOI: 10.1016/j.carbon.2018.01.098

Temperature Measurement by a Nanoscale Electron Probe Using Energy Gain and Loss Spectroscopy

The monochromated, aberration-corrected scanning transmission electron microscope (“MAC-STEM”) directly measures the local temperature at the nanoscale, without having to rely on calibration.

J. C. Idrobo, A. R. Lupini, T. Feng, R. R. Unocic, F. S. Walden, D. S. Gardiner, T. C. Lovejoy, N. Dellby, S. T. Pantelides, and O. L. Krivanek, "Temperature measurement by a nanoscale electron probe using energy gain and loss spectroscopy," Phys. Rev. Lett. 120, 095901 (2018).  DOI:https://doi.org/10.1103/PhysRevLett.120.095901

All-Acyrlic Superelastomers

Thermoplastic elastomers (TPEs), such as styrenic based automobile tires, are ubiquitous in our society. But styrenic based TPEs suffer from low upper service temperatures and poorer mechanical properties. Here by using a facile synthesis approach, a new class of all-acrylic superelastomers was developed that show superior mechanical strength and higher upper service temperatures.

W. Lu, A. Goodwin, Y. Wang, P. Yin, W. Wang, J. Zhu, T. Wu, X. Lu, B. Hu, K. Hong, N.-G. Kang, and J. Mays, "All-acrylic superelastomers: facile synthesis and exceptional mechanical behavior," Polymer Chemistry 9, 160 (2018).  DOI: 10.1039/C7PY01518F

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