Featured Research Highlights
Revealing the Role of Caged Cations in Hybrid Perovskites
Scientific Achievement Neutron diffraction reveals that caged MA+ cations become disordered as the temperature is raised beyond 130K to induce a phase transition (orthorhombic to tetragonal) in novel hybrid perovskite materials used for solar...
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
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
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
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 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)
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
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
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