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Divergent Adsorption-Dependent Luminescence of Amino-Functionalized Lanthanide Metal–Organic Frameworks for Highly Sensitive NO2 Sensors

A novel gas-sensing mechanism exploiting lanthanide luminescence modulation upon NO2 adsorption is demonstrated. Two isostructural lanthanide MOFs are used, including an amino group as the recognition center for NO2. Energy transfer from the ligands to Ln is strongly dependent on the presence of NO2, resulting in an unprecedented photoluminescent sensing scheme. Read more »

Coordination Engineering of Single-Crystal Precursor for Phase Control in Ruddlesden-Popper Perovskite Solar Cells

Chaochao Qin, Alex K.-Y. Jen, Kai Yao and co-workers describe a generic guideline for fine tuning colloidal properties of 2D perovskites via coordination engineering of the single-crystal precursor solution. In nonpolar co-solvent media, the derived colloidal templates prefer to grow along the vertical direction with a narrow phase variation, elucidating the critical role of colloidal chemistry in low-dimensional perovskite solar cells. Read more »

Porous Electrolyte Frameworks for All-Solid-State Batteries

With the help of microtomography at the ALS, researchers developed a method to produce a porous electrolyte framework that they used to construct a working all-solid-state battery. Such batteries potentially offer a higher energy density, longer cycle life, and better inherent safety than state-of-the-art lithium-ion batteries. Read more »

Study Leads to Firmer Grasp of Biochemical “Reactive Handle”

Protein crystallography provided new insight into a functional group of molecules that, if added to bacterial enzymes, could enable a variety of alterations to the bacteria’s polymer output. Tweaking enzymes to produce these “reactive handles” is a first step toward biosynthesizing diverse polymers with tailored properties. Read more »

ALS in the News (April 2020)

Direct Imaging of Fracture Closure in Reservoir Shales

Using x-ray microtomography at the ALS, researchers identified and characterized the microscale factors affecting fluid flow through shale fractures propped open with sand or ceramic spheres. A better understanding of propped fractures can lead to safer and more efficient recovery of hard-to-reach oil and gas resources. Read more »PPT-icon-35 PDF-icon-35

Assembly Lines for Designer Bioactive Compounds

Researchers successfully bioengineered changes to a molecular “assembly line” for bioactive compounds, based in part on insights gained from small-angle x-ray scattering at the ALS. The ability to re-engineer these assembly lines could improve their performance and facilitate the synthesis of new medically useful compounds. Read more »PPT-icon-35 PDF-icon-35

Seeing ‘Under the Hood’ in Batteries

To push battery performance, researchers want to learn how the individual ingredients of battery materials behave beneath the surface. But many techniques only scratch the surface of what’s at work inside batteries. A high-sensitivity x-ray technique is attracting a growing group of scientists because it provides a deeper, more precise dive into battery chemistry. Read more »