@article{oh_thelven_margavio_parsons_2024, title={Low-Temperature Dual-Material Area-Selective Deposition: Molybdenum Hexafluoride-Mediated SiO<sub>2</sub> Fluorination/Passivation for Self-Aligned Molybdenum/Metal Oxide Nanoribbons}, volume={4}, ISSN={["1616-3028"]}, url={https://doi.org/10.1002/adfm.202316872}, DOI={10.1002/adfm.202316872}, abstractNote={Abstract Area‐selective deposition (ASD) is a forefront nanopatterning technique gaining substantial attention in the semiconductor industry. While current research primarily addresses single‐material ASD, exploring multi‐material ASD is essential for mitigating complexity in advanced nanopatterning. This study describes molybdenum hexafluoride (MoF 6 )‐mediated fluorination/passivation of the hydroxylated SiO 2 (SiO 2 ‒OH) at 250 °C as a new method to pacify nucleation during subsequent ZnO and TiO 2 atomic layer deposition (ALD). In contrast, Al 2 O 3 ALD is not passivated on the fluorinated SiO 2 (SiO 2 ‒F). The study further shows that Mo ALD using MoF 6 and silane (1 wt% SiH 4 in Ar) selectively proceeds on hydrogen‐terminated Si (Si‒H), whereas SiO 2 ‒OH becomes fluorine‐passivated without observable Mo deposition. This enables subsequent ZnO and TiO 2 ASD on Mo versus SiO 2 ‒F, as confirmed by X‐ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and scanning transmission electron microscopy (STEM). Proposed growth and inhibition mechanisms highlight the importance of the metal oxide precursor in achieving selectivity. Taken together, self‐aligned Mo/ZnO and Mo/TiO 2 nanoribbons are demonstrated on coplanar nanoscale Si‒H/SiO 2 ‒OH patterns by sequentially integrating two individual ASD processes: 1) Mo ASD on Si‒H versus SiO 2 ‒OH; and 2) ZnO or TiO 2 ASD on Mo versus SiO 2 ‒F. This work highlights the potential for this approach in new ASD systems.}, journal={ADVANCED FUNCTIONAL MATERIALS}, author={Oh, Hwan and Thelven, Jeremy M. and Margavio, Hannah R. M. and Parsons, Gregory N.}, year={2024}, month={Apr} }
 @article{bea_frawley_shen_moyo_thelven_north_2023, title={Synthesized peptide analogs from Eumenes pomiformis (Hymenoptera: Eumenidae) venom reveals their antibiotic and pesticide activity potential}, volume={224}, ISSN={["1879-3150"]}, DOI={10.1016/j.toxicon.2023.107032}, abstractNote={One natural antimicrobial peptide (EpVP2a, Eumenes pomiformis Venom Peptide 2a) found in the venom of a potter wasp (Eumenes pomiformis) and six analogs were synthesized and tested to compare their antimicrobial, antifungal, pesticide, and hemolytic activity with the wild type. Our results indicated that while the original peptide and the synthetic analogs had no antifungal activity or anti-bacterial activity against Pseudomonas aeruginosa, the original peptide and the analog with substitution of the aspartic acid on the sequence by a lysine (EpVP2a-D2K2) had activity against Escherichia coli, Staphylococcus aureus and Bacillus subtilis. This same analog also shows significant insecticide activity. The analog with substitution of lysine with a slightly smaller ornithine had activity against E. coli and B. subtilis. All analogs show low hemolytic activity compared to the natural peptide. The peptide with a reverse sequence to the natural one (EpVp2a Retro) shows low helix structure which can also explain why it has no antibacterial activity and low hemolytic activity. Circular dichroism spectra show that these peptides form an alpha helix structure and their amino acid positions predict an amphipathic nature.}, journal={TOXICON}, author={Bea, Roberto de la Salud and Frawley, Elaine and Shen, Qian and Moyo, Sydney and Thelven, Jeremy M. and North, Lily}, year={2023}, month={Mar} }